[PATCH] crypto: Add Skein hash algorithm variants
From: Jeff Garzik
Date: Sun Nov 02 2008 - 11:15:31 EST
This is the first draft of the Skein hash algorithm that was recently
mentioned, as a prominent submission to NIST's SHA-3 competition.
Website: http://www.schneier.com/skein.html
It still needs more work, linux-ifying, testing, and reviewing.
One note I forgot to mention in the commit itself, but should be
considered when reviewing this:
Skein permits the output digest size to be specified by the user.
"Skein-256" means 256 bits of internal state, NOT 256 bits of output
digest. The output digest size is specified to Skein at init time.
In my implementation below, I attempted to follow the Principle of Least
Surprise, by hardcoding output digest size == internal state size.
Thus, in my implementation, "skein256" really does mean 256 output bits.
I am currently pushing this work to the 'skein' branch of
git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/misc-2.6.git skein
Comments welcome!
---
crypto/Kconfig | 12 +
crypto/Makefile | 3 +
crypto/skein.h | 265 ++++++++++++++++++++++
crypto/skein1024_generic.c | 518 ++++++++++++++++++++++++++++++++++++++++++++
crypto/skein256_generic.c | 367 +++++++++++++++++++++++++++++++
crypto/skein512_generic.c | 417 +++++++++++++++++++++++++++++++++++
6 files changed, 1582 insertions(+), 0 deletions(-)
create mode 100644 crypto/skein.h
create mode 100644 crypto/skein1024_generic.c
create mode 100644 crypto/skein256_generic.c
create mode 100644 crypto/skein512_generic.c
Jeff Garzik (1):
[CRYPTO] Add Skein hash algorithm, 256-, 512-, and 1024-bit variants
Import the public domain reference implementation of the Skein hash
algorithm into the Linux Crypto API. This is a prominent submission
to the NIST's competition for SHA-3.
See Skein website for more info: http://www.schneier.com/skein.html
This is just a rough import, and still needs more cleaning and Linux-ifying.
Signed-off-by: Jeff Garzik <jgarzik@xxxxxxxxxx>
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 39dbd8e..f18868f 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -352,6 +352,18 @@ config CRYPTO_SHA512
This code also includes SHA-384, a 384 bit hash with 192 bits
of security against collision attacks.
+config CRYPTO_SKEIN256
+ tristate "Skein-256(256) digest algorithm"
+ select CRYPTO_ALGAPI
+
+config CRYPTO_SKEIN512
+ tristate "Skein-512(512) digest algorithm"
+ select CRYPTO_ALGAPI
+
+config CRYPTO_SKEIN1024
+ tristate "Skein-1024(1024) digest algorithm"
+ select CRYPTO_ALGAPI
+
config CRYPTO_TGR192
tristate "Tiger digest algorithms"
select CRYPTO_ALGAPI
diff --git a/crypto/Makefile b/crypto/Makefile
index 5862b80..10c3ca8 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -39,6 +39,9 @@ obj-$(CONFIG_CRYPTO_RMD320) += rmd320.o
obj-$(CONFIG_CRYPTO_SHA1) += sha1_generic.o
obj-$(CONFIG_CRYPTO_SHA256) += sha256_generic.o
obj-$(CONFIG_CRYPTO_SHA512) += sha512_generic.o
+obj-$(CONFIG_CRYPTO_SKEIN256) += skein256_generic.o
+obj-$(CONFIG_CRYPTO_SKEIN512) += skein512_generic.o
+obj-$(CONFIG_CRYPTO_SKEIN1024) += skein1024_generic.o
obj-$(CONFIG_CRYPTO_WP512) += wp512.o
obj-$(CONFIG_CRYPTO_TGR192) += tgr192.o
obj-$(CONFIG_CRYPTO_GF128MUL) += gf128mul.o
diff --git a/crypto/skein.h b/crypto/skein.h
new file mode 100644
index 0000000..2753b55
--- /dev/null
+++ b/crypto/skein.h
@@ -0,0 +1,265 @@
+#ifndef _SKEIN_H_
+#define _SKEIN_H_ 1
+/**************************************************************************
+**
+** Interface declarations and internal definitions for Skein hashing.
+**
+** Source code author: Doug Whiting, 2008.
+**
+** This algorithm and source code is released to the public domain.
+**
+***************************************************************************
+**
+** The following compile-time switches may be defined to control some
+** tradeoffs between speed, code size, error checking, and security.
+**
+** The "default" note explains what happens when the switch is not defined.
+**
+** SKEIN_DEBUG -- make callouts from inside Skein code
+** to examine/display intermediate values.
+** [default: no callouts (no overhead)]
+**
+** SKEIN_ERR_CHECK -- how error checking is handled inside Skein
+** code. If not defined, most error checking
+** is disabled (for performance). Otherwise,
+** the switch value is interpreted as:
+** 0: use assert() to flag errors
+** 1: return SKEIN_FAIL to flag errors
+**
+***************************************************************************/
+
+#include <linux/types.h>
+
+enum {
+ SKEIN_SUCCESS = 0, /* return codes from Skein calls */
+ SKEIN_FAIL = 1,
+ SKEIN_BAD_HASHLEN = 2
+};
+
+#define SKEIN_MODIFIER_WORDS ( 2) /* number of modifier (tweak) words */
+
+#define SKEIN_256_STATE_WORDS ( 4)
+#define SKEIN_512_STATE_WORDS ( 8)
+#define SKEIN1024_STATE_WORDS (16)
+#define SKEIN_MAX_STATE_WORDS (16)
+
+#define SKEIN_256_STATE_BYTES ( 8*SKEIN_256_STATE_WORDS)
+#define SKEIN_512_STATE_BYTES ( 8*SKEIN_512_STATE_WORDS)
+#define SKEIN1024_STATE_BYTES ( 8*SKEIN1024_STATE_WORDS)
+
+#define SKEIN_256_STATE_BITS (64*SKEIN_256_STATE_WORDS)
+#define SKEIN_512_STATE_BITS (64*SKEIN_512_STATE_WORDS)
+#define SKEIN1024_STATE_BITS (64*SKEIN1024_STATE_WORDS)
+
+#define SKEIN_256_BLOCK_BYTES ( 8*SKEIN_256_STATE_WORDS)
+#define SKEIN_512_BLOCK_BYTES ( 8*SKEIN_512_STATE_WORDS)
+#define SKEIN1024_BLOCK_BYTES ( 8*SKEIN1024_STATE_WORDS)
+
+typedef struct {
+ size_t hashBitLen; /* size of hash result, in bits */
+ size_t bCnt; /* current byte count in buffer b[] */
+ u64 T[SKEIN_MODIFIER_WORDS]; /* tweak words: T[0]=byte cnt, T[1]=flags */
+} Skein_Ctxt_Hdr_t;
+
+struct skein256_ctx { /* 256-bit Skein hash context structure */
+ Skein_Ctxt_Hdr_t h; /* common header context variables */
+ u64 X[SKEIN_256_STATE_WORDS]; /* chaining variables */
+ u8 b[SKEIN_256_BLOCK_BYTES]; /* partial block buffer (8-byte aligned) */
+};
+
+struct skein512_ctx { /* 512-bit Skein hash context structure */
+ Skein_Ctxt_Hdr_t h; /* common header context variables */
+ u64 X[SKEIN_512_STATE_WORDS]; /* chaining variables */
+ u8 b[SKEIN_512_BLOCK_BYTES]; /* partial block buffer (8-byte aligned) */
+};
+
+struct skein1024_ctx { /* 1024-bit Skein hash context structure */
+ Skein_Ctxt_Hdr_t h; /* common header context variables */
+ u64 X[SKEIN1024_STATE_WORDS]; /* chaining variables */
+ u8 b[SKEIN1024_BLOCK_BYTES]; /* partial block buffer (8-byte aligned) */
+};
+
+/*****************************************************************
+** "Internal" Skein definitions
+** -- not needed for sequential hashing API, but will be
+** helpful for other uses of Skein (e.g., tree hash mode).
+** -- included here so that they can be shared between
+** reference and optimized code.
+******************************************************************/
+
+/* tweak word T[1]: bit field starting positions */
+#define SKEIN_T1_BIT(BIT) ((BIT) - 64) /* offset 64 because it's the second word */
+
+#define SKEIN_T1_POS_TREE_LVL SKEIN_T1_BIT(112) /* bits 112..118: level in hash tree */
+#define SKEIN_T1_POS_BIT_PAD SKEIN_T1_BIT(119) /* bit 119 : partial final input byte */
+#define SKEIN_T1_POS_BLK_TYPE SKEIN_T1_BIT(120) /* bits 120..125: type field */
+#define SKEIN_T1_POS_FIRST SKEIN_T1_BIT(126) /* bits 126 : first block flag */
+#define SKEIN_T1_POS_FINAL SKEIN_T1_BIT(127) /* bit 127 : final block flag */
+
+/* tweak word T[1]: flag bit definition(s) */
+#define SKEIN_T1_FLAG_FIRST (((u64) 1 ) << SKEIN_T1_POS_FIRST)
+#define SKEIN_T1_FLAG_FINAL (((u64) 1 ) << SKEIN_T1_POS_FINAL)
+#define SKEIN_T1_FLAG_BIT_PAD (((u64) 1 ) << SKEIN_T1_POS_BIT_PAD)
+
+/* tweak word T[1]: tree level bit field mask */
+#define SKEIN_T1_TREE_LVL_MASK (((u64)0x7F) << SKEIN_T1_POS_TREE_LVL)
+#define SKEIN_T1_TREE_LEVEL(n) (((u64) (n)) << SKEIN_T1_POS_TREE_LVL)
+
+/* tweak word T[1]: block type field */
+#define SKEIN_BLK_TYPE_KEY ( 0) /* key, for MAC and KDF */
+#define SKEIN_BLK_TYPE_CFG ( 4) /* configuration block */
+#define SKEIN_BLK_TYPE_PERS ( 8) /* personalization string */
+#define SKEIN_BLK_TYPE_PK (12) /* public key (for digital signature hashing) */
+#define SKEIN_BLK_TYPE_KDF (16) /* key identifier for KDF */
+#define SKEIN_BLK_TYPE_NONCE (20) /* nonce for PRNG */
+#define SKEIN_BLK_TYPE_MSG (48) /* message processing */
+#define SKEIN_BLK_TYPE_OUT (63) /* output stage */
+#define SKEIN_BLK_TYPE_MASK (63) /* bit field mask */
+
+#define SKEIN_T1_BLK_TYPE(T) (((u64) (SKEIN_BLK_TYPE_##T)) << SKEIN_T1_POS_BLK_TYPE)
+#define SKEIN_T1_BLK_TYPE_KEY SKEIN_T1_BLK_TYPE(KEY) /* key, for MAC and KDF */
+#define SKEIN_T1_BLK_TYPE_CFG SKEIN_T1_BLK_TYPE(CFG) /* configuration block */
+#define SKEIN_T1_BLK_TYPE_PERS SKEIN_T1_BLK_TYPE(PERS) /* personalization string */
+#define SKEIN_T1_BLK_TYPE_PK SKEIN_T1_BLK_TYPE(PK) /* public key (for digital signature hashing) */
+#define SKEIN_T1_BLK_TYPE_KDF SKEIN_T1_BLK_TYPE(KDF) /* key identifier for KDF */
+#define SKEIN_T1_BLK_TYPE_NONCE SKEIN_T1_BLK_TYPE(NONCE) /* nonce for PRNG */
+#define SKEIN_T1_BLK_TYPE_MSG SKEIN_T1_BLK_TYPE(MSG) /* message processing */
+#define SKEIN_T1_BLK_TYPE_OUT SKEIN_T1_BLK_TYPE(OUT) /* output stage */
+#define SKEIN_T1_BLK_TYPE_MASK SKEIN_T1_BLK_TYPE(MASK) /* field bit mask */
+
+#define SKEIN_T1_BLK_TYPE_CFG_FINAL (SKEIN_T1_BLK_TYPE_CFG | SKEIN_T1_FLAG_FINAL)
+#define SKEIN_T1_BLK_TYPE_OUT_FINAL (SKEIN_T1_BLK_TYPE_OUT | SKEIN_T1_FLAG_FINAL)
+
+#define SKEIN_VERSION (1)
+
+#ifndef SKEIN_ID_STRING_LE /* allow compile-time personalization */
+#define SKEIN_ID_STRING_LE (0x33414853) /* "SHA3" (little-endian) */
+#endif
+
+#define SKEIN_MK_64(hi32,lo32) ((lo32) + (((u64) (hi32)) << 32))
+#define SKEIN_SCHEMA_VER SKEIN_MK_64(SKEIN_VERSION,SKEIN_ID_STRING_LE)
+#define SKEIN_KS_PARITY SKEIN_MK_64(0x55555555,0x55555555)
+
+/* bit field definitions in config block treeInfo word */
+#define SKEIN_CFG_TREE_LEAF_SIZE_POS ( 0)
+#define SKEIN_CFG_TREE_NODE_SIZE_POS ( 8)
+#define SKEIN_CFG_TREE_MAX_LEVEL_POS (16)
+
+#define SKEIN_CFG_TREE_LEAF_SIZE_MSK ((u64) 0xFF) << SKEIN_CFG_TREE_LEAF_SIZE_POS)
+#define SKEIN_CFG_TREE_NODE_SIZE_MSK ((u64) 0xFF) << SKEIN_CFG_TREE_NODE_SIZE_POS)
+#define SKEIN_CFG_TREE_MAX_LEVEL_MSK ((u64) 0xFF) << SKEIN_CFG_TREE_MAX_LEVEL_POS)
+
+#define SKEIN_CFG_TREE_INFO_SEQUENTIAL (0) /* use as treeInfo in InitExt() call for sequential processing */
+#define SKEIN_CFG_TREE_INFO(leaf,node,maxLevel) ((u64) ((leaf) | ((node) << 8) | ((maxLevel) << 16)))
+
+/*
+** Skein macros for getting/setting tweak words, etc.
+** These are useful for partial input bytes, hash tree init/update, etc.
+**/
+#define Skein_Get_Tweak(ctxPtr,TWK_NUM) ((ctxPtr)->h.T[TWK_NUM])
+#define Skein_Set_Tweak(ctxPtr,TWK_NUM,tVal) {(ctxPtr)->h.T[TWK_NUM] = (tVal);}
+
+#define Skein_Get_T0(ctxPtr) Skein_Get_Tweak(ctxPtr,0)
+#define Skein_Get_T1(ctxPtr) Skein_Get_Tweak(ctxPtr,1)
+#define Skein_Set_T0(ctxPtr,T0) Skein_Set_Tweak(ctxPtr,0,T0)
+#define Skein_Set_T1(ctxPtr,T1) Skein_Set_Tweak(ctxPtr,1,T1)
+
+/* set both tweak words at once */
+#define Skein_Set_T0_T1(ctxPtr,T0,T1) \
+ { \
+ Skein_Set_T0(ctxPtr,(T0)); \
+ Skein_Set_T1(ctxPtr,(T1)); \
+ }
+
+#define Skein_Set_Type(ctxPtr,BLK_TYPE) \
+ Skein_Set_T1(ctxPtr,SKEIN_T1_BLK_TYPE_##BLK_TYPE)
+
+/* set up for starting with a new type: h.T[0]=0; h.T[1] = NEW_TYPE; h.bCnt=0; */
+#define Skein_Start_New_Type(ctxPtr,BLK_TYPE) \
+ { Skein_Set_T0_T1(ctxPtr,0,SKEIN_T1_FLAG_FIRST | SKEIN_T1_BLK_TYPE_##BLK_TYPE); (ctxPtr)->h.bCnt=0; }
+
+#define Skein_Clear_First_Flag(hdr) { (hdr).T[1] &= ~SKEIN_T1_FLAG_FIRST; }
+#define Skein_Set_Bit_Pad_Flag(hdr) { (hdr).T[1] |= SKEIN_T1_FLAG_BIT_PAD; }
+
+#define Skein_Set_Tree_Level(hdr,height) { (hdr).T[1] |= SKEIN_T1_TREE_LEVEL(height);}
+
+/*****************************************************************
+** "Internal" Skein definitions for debugging and error checking
+******************************************************************/
+#ifdef SKEIN_DEBUG /* examine/display intermediate values? */
+#include "skein_debug.h"
+#else /* default is no callouts */
+#define Skein_Show_Block(bits,ctx,X,blkPtr,wPtr,ksEvenPtr,ksOddPtr)
+#define Skein_Show_Round(bits,ctx,r,X)
+#define Skein_Show_R_Ptr(bits,ctx,r,X_ptr)
+#define Skein_Show_Final(bits,ctx,cnt,outPtr)
+#define Skein_Show_Key(bits,ctx,key,keyBytes)
+#endif
+
+#ifndef SKEIN_ERR_CHECK /* run-time checks (e.g., bad params, uninitialized context)? */
+#define Skein_Assert(x,retCode) /* default: ignore all Asserts, for performance */
+#define Skein_assert(x)
+#elif defined(SKEIN_ASSERT)
+#include <assert.h>
+#define Skein_Assert(x,retCode) assert(x)
+#define Skein_assert(x) assert(x)
+#else
+#include <assert.h>
+#define Skein_Assert(x,retCode) { if (!(x)) return retCode; } /* caller error */
+#define Skein_assert(x) assert(x) /* internal error */
+#endif
+
+/*****************************************************************
+** Skein block function constants (shared across Ref and Opt code)
+******************************************************************/
+enum {
+ /* Skein_256 round rotation constants */
+ R_256_0_0 = 5, R_256_0_1 = 56,
+ R_256_1_0 = 36, R_256_1_1 = 28,
+ R_256_2_0 = 13, R_256_2_1 = 46,
+ R_256_3_0 = 58, R_256_3_1 = 44,
+ R_256_4_0 = 26, R_256_4_1 = 20,
+ R_256_5_0 = 53, R_256_5_1 = 35,
+ R_256_6_0 = 11, R_256_6_1 = 42,
+ R_256_7_0 = 59, R_256_7_1 = 50,
+
+ /* Skein_512 round rotation constants */
+ R_512_0_0 = 38, R_512_0_1 = 30, R_512_0_2 = 50, R_512_0_3 = 53,
+ R_512_1_0 = 48, R_512_1_1 = 20, R_512_1_2 = 43, R_512_1_3 = 31,
+ R_512_2_0 = 34, R_512_2_1 = 14, R_512_2_2 = 15, R_512_2_3 = 27,
+ R_512_3_0 = 26, R_512_3_1 = 12, R_512_3_2 = 58, R_512_3_3 = 7,
+ R_512_4_0 = 33, R_512_4_1 = 49, R_512_4_2 = 8, R_512_4_3 = 42,
+ R_512_5_0 = 39, R_512_5_1 = 27, R_512_5_2 = 41, R_512_5_3 = 14,
+ R_512_6_0 = 29, R_512_6_1 = 26, R_512_6_2 = 11, R_512_6_3 = 9,
+ R_512_7_0 = 33, R_512_7_1 = 51, R_512_7_2 = 39, R_512_7_3 = 35,
+
+ /* Skein1024 round rotation constants */
+ R1024_0_0 = 55, R1024_0_1 = 43, R1024_0_2 = 37, R1024_0_3 =
+ 40, R1024_0_4 = 16, R1024_0_5 = 22, R1024_0_6 = 38, R1024_0_7 = 12,
+ R1024_1_0 = 25, R1024_1_1 = 25, R1024_1_2 = 46, R1024_1_3 =
+ 13, R1024_1_4 = 14, R1024_1_5 = 13, R1024_1_6 = 52, R1024_1_7 = 57,
+ R1024_2_0 = 33, R1024_2_1 = 8, R1024_2_2 = 18, R1024_2_3 =
+ 57, R1024_2_4 = 21, R1024_2_5 = 12, R1024_2_6 = 32, R1024_2_7 = 54,
+ R1024_3_0 = 34, R1024_3_1 = 43, R1024_3_2 = 25, R1024_3_3 =
+ 60, R1024_3_4 = 44, R1024_3_5 = 9, R1024_3_6 = 59, R1024_3_7 = 34,
+ R1024_4_0 = 28, R1024_4_1 = 7, R1024_4_2 = 47, R1024_4_3 =
+ 48, R1024_4_4 = 51, R1024_4_5 = 9, R1024_4_6 = 35, R1024_4_7 = 41,
+ R1024_5_0 = 17, R1024_5_1 = 6, R1024_5_2 = 18, R1024_5_3 =
+ 25, R1024_5_4 = 43, R1024_5_5 = 42, R1024_5_6 = 40, R1024_5_7 = 15,
+ R1024_6_0 = 58, R1024_6_1 = 7, R1024_6_2 = 32, R1024_6_3 =
+ 45, R1024_6_4 = 19, R1024_6_5 = 18, R1024_6_6 = 2, R1024_6_7 = 56,
+ R1024_7_0 = 47, R1024_7_1 = 49, R1024_7_2 = 27, R1024_7_3 =
+ 58, R1024_7_4 = 37, R1024_7_5 = 48, R1024_7_6 = 53, R1024_7_7 = 56
+};
+
+#ifndef SKEIN_ROUNDS
+#define SKEIN_256_ROUNDS_TOTAL (72) /* number of rounds for the different block sizes */
+#define SKEIN_512_ROUNDS_TOTAL (72)
+#define SKEIN1024_ROUNDS_TOTAL (80)
+#else /* allow command-line define in range 8*(5..14) */
+#define SKEIN_256_ROUNDS_TOTAL (8*((((SKEIN_ROUNDS/100) + 5) % 10) + 5))
+#define SKEIN_512_ROUNDS_TOTAL (8*((((SKEIN_ROUNDS/ 10) + 5) % 10) + 5))
+#define SKEIN1024_ROUNDS_TOTAL (8*((((SKEIN_ROUNDS ) + 5) % 10) + 5))
+#endif
+
+#endif /* ifndef _SKEIN_H_ */
diff --git a/crypto/skein1024_generic.c b/crypto/skein1024_generic.c
new file mode 100644
index 0000000..45cf122
--- /dev/null
+++ b/crypto/skein1024_generic.c
@@ -0,0 +1,518 @@
+/***********************************************************************
+**
+** Implementation of the Skein hash function.
+**
+** Source code author: Doug Whiting, 2008.
+**
+** This algorithm and source code is released to the public domain.
+**
+************************************************************************/
+
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include "skein.h" /* get the Skein API definitions */
+
+#define SKEIN1024_BLOCK_SIZE SKEIN1024_BLOCK_BYTES
+#define SKEIN1024_DIGEST_BITS 1024
+#define SKEIN1024_DIGEST_SIZE (SKEIN1024_DIGEST_BITS / 8)
+
+static int Skein1024_Init(struct skein1024_ctx * ctx, size_t hashBitLen);
+static int Skein1024_Update(struct skein1024_ctx * ctx, const u8 * msg, size_t msgByteCnt);
+static int Skein1024_Final(struct skein1024_ctx * ctx, u8 * hashVal);
+
+/*****************************************************************/
+/* Portable (i.e., slow) endianness conversion functions */
+static u64 Skein_Swap64(u64 w64)
+{ /* instantiate the function body here */
+ static const u64 ONE = 1; /* use this to check endianness */
+
+ /* figure out endianness "on-the-fly" */
+ if (1 == ((u8 *) & ONE)[0])
+ return w64; /* little-endian is fast */
+ else
+ return ((w64 & 0xFF) << 56) | /* big-endian is slow */
+ (((w64 >> 8) & 0xFF) << 48) |
+ (((w64 >> 16) & 0xFF) << 40) |
+ (((w64 >> 24) & 0xFF) << 32) |
+ (((w64 >> 32) & 0xFF) << 24) |
+ (((w64 >> 40) & 0xFF) << 16) |
+ (((w64 >> 48) & 0xFF) << 8) | (((w64 >> 56) & 0xFF));
+}
+
+static void Skein_Put64_LSB_First(u8 * dst, const u64 * src, size_t bCnt)
+{ /* this version is fully portable (big-endian or little-endian), but slow */
+ size_t n;
+
+ for (n = 0; n < bCnt; n++)
+ dst[n] = (u8) (src[n >> 3] >> (8 * (n & 7)));
+}
+
+static void Skein_Get64_LSB_First(u64 * dst, const u8 * src, size_t wCnt)
+{ /* this version is fully portable (big-endian or little-endian), but slow */
+ size_t n;
+
+ for (n = 0; n < 8 * wCnt; n += 8)
+ dst[n / 8] = (((u64) src[n])) +
+ (((u64) src[n + 1]) << 8) +
+ (((u64) src[n + 2]) << 16) +
+ (((u64) src[n + 3]) << 24) +
+ (((u64) src[n + 4]) << 32) +
+ (((u64) src[n + 5]) << 40) +
+ (((u64) src[n + 6]) << 48) + (((u64) src[n + 7]) << 56);
+}
+
+/* 64-bit rotate left */
+static u64 RotL_64(u64 x, unsigned int N)
+{
+ return (x << (N & 63)) | (x >> ((64 - N) & 63));
+}
+
+#define BLK_BITS (WCNT*64)
+
+/* macro to perform a key injection (same for all block sizes) */
+#define InjectKey(r) \
+ for (i=0;i < WCNT;i++) \
+ X[i] += ks[((r)+i) % (WCNT+1)]; \
+ X[WCNT-3] += ts[((r)+0) % 3]; \
+ X[WCNT-2] += ts[((r)+1) % 3]; \
+ X[WCNT-1] += (r); /* avoid slide attacks */ \
+ Skein_Show_Round(BLK_BITS,&ctx->h,SKEIN_RND_KEY_INJECT,X);
+
+static void Skein1024_Process_Block(struct skein1024_ctx *ctx, const u8 *blkPtr,
+ size_t blkCnt, size_t byteCntAdd)
+{ /* do it in C */
+ enum {
+ WCNT = SKEIN1024_STATE_WORDS
+ };
+
+ size_t i, r;
+ u64 ts[3]; /* key schedule: tweak */
+ u64 ks[WCNT + 1]; /* key schedule: chaining vars */
+ u64 X[WCNT]; /* local copy of vars */
+ u64 w[WCNT]; /* local copy of input block */
+
+ Skein_assert(blkCnt != 0); /* never call with blkCnt == 0! */
+ do {
+ /* this implementation only supports 2**64 input bytes (no carry out here) */
+ ctx->h.T[0] += byteCntAdd; /* update processed length */
+
+ /* precompute the key schedule for this block */
+ ks[WCNT] = SKEIN_KS_PARITY;
+ for (i = 0; i < WCNT; i++) {
+ ks[i] = ctx->X[i];
+ ks[WCNT] ^= ctx->X[i]; /* compute overall parity */
+ }
+ ts[0] = ctx->h.T[0];
+ ts[1] = ctx->h.T[1];
+ ts[2] = ts[0] ^ ts[1];
+
+ Skein_Get64_LSB_First(w, blkPtr, WCNT); /* get input block in little-endian format */
+ Skein_Show_Block(BLK_BITS, &ctx->h, ctx->X, blkPtr, w, ks, ts);
+ for (i = 0; i < WCNT; i++) { /* do the first full key injection */
+ X[i] = w[i] + ks[i];
+ }
+ X[WCNT - 3] += ts[0];
+ X[WCNT - 2] += ts[1];
+
+ Skein_Show_Round(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INITIAL, X); /* show starting state values */
+ for (r = 1; r <= SKEIN1024_ROUNDS_TOTAL / 8; r++) { /* unroll 8 rounds */
+ X[0] += X[1];
+ X[1] = RotL_64(X[1], R1024_0_0);
+ X[1] ^= X[0];
+ X[2] += X[3];
+ X[3] = RotL_64(X[3], R1024_0_1);
+ X[3] ^= X[2];
+ X[4] += X[5];
+ X[5] = RotL_64(X[5], R1024_0_2);
+ X[5] ^= X[4];
+ X[6] += X[7];
+ X[7] = RotL_64(X[7], R1024_0_3);
+ X[7] ^= X[6];
+ X[8] += X[9];
+ X[9] = RotL_64(X[9], R1024_0_4);
+ X[9] ^= X[8];
+ X[10] += X[11];
+ X[11] = RotL_64(X[11], R1024_0_5);
+ X[11] ^= X[10];
+ X[12] += X[13];
+ X[13] = RotL_64(X[13], R1024_0_6);
+ X[13] ^= X[12];
+ X[14] += X[15];
+ X[15] = RotL_64(X[15], R1024_0_7);
+ X[15] ^= X[14];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 7, X);
+
+ X[0] += X[9];
+ X[9] = RotL_64(X[9], R1024_1_0);
+ X[9] ^= X[0];
+ X[2] += X[13];
+ X[13] = RotL_64(X[13], R1024_1_1);
+ X[13] ^= X[2];
+ X[6] += X[11];
+ X[11] = RotL_64(X[11], R1024_1_2);
+ X[11] ^= X[6];
+ X[4] += X[15];
+ X[15] = RotL_64(X[15], R1024_1_3);
+ X[15] ^= X[4];
+ X[10] += X[7];
+ X[7] = RotL_64(X[7], R1024_1_4);
+ X[7] ^= X[10];
+ X[12] += X[3];
+ X[3] = RotL_64(X[3], R1024_1_5);
+ X[3] ^= X[12];
+ X[14] += X[5];
+ X[5] = RotL_64(X[5], R1024_1_6);
+ X[5] ^= X[14];
+ X[8] += X[1];
+ X[1] = RotL_64(X[1], R1024_1_7);
+ X[1] ^= X[8];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 6, X);
+
+ X[0] += X[7];
+ X[7] = RotL_64(X[7], R1024_2_0);
+ X[7] ^= X[0];
+ X[2] += X[5];
+ X[5] = RotL_64(X[5], R1024_2_1);
+ X[5] ^= X[2];
+ X[4] += X[3];
+ X[3] = RotL_64(X[3], R1024_2_2);
+ X[3] ^= X[4];
+ X[6] += X[1];
+ X[1] = RotL_64(X[1], R1024_2_3);
+ X[1] ^= X[6];
+ X[12] += X[15];
+ X[15] = RotL_64(X[15], R1024_2_4);
+ X[15] ^= X[12];
+ X[14] += X[13];
+ X[13] = RotL_64(X[13], R1024_2_5);
+ X[13] ^= X[14];
+ X[8] += X[11];
+ X[11] = RotL_64(X[11], R1024_2_6);
+ X[11] ^= X[8];
+ X[10] += X[9];
+ X[9] = RotL_64(X[9], R1024_2_7);
+ X[9] ^= X[10];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 5, X);
+
+ X[0] += X[15];
+ X[15] = RotL_64(X[15], R1024_3_0);
+ X[15] ^= X[0];
+ X[2] += X[11];
+ X[11] = RotL_64(X[11], R1024_3_1);
+ X[11] ^= X[2];
+ X[6] += X[13];
+ X[13] = RotL_64(X[13], R1024_3_2);
+ X[13] ^= X[6];
+ X[4] += X[9];
+ X[9] = RotL_64(X[9], R1024_3_3);
+ X[9] ^= X[4];
+ X[14] += X[1];
+ X[1] = RotL_64(X[1], R1024_3_4);
+ X[1] ^= X[14];
+ X[8] += X[5];
+ X[5] = RotL_64(X[5], R1024_3_5);
+ X[5] ^= X[8];
+ X[10] += X[3];
+ X[3] = RotL_64(X[3], R1024_3_6);
+ X[3] ^= X[10];
+ X[12] += X[7];
+ X[7] = RotL_64(X[7], R1024_3_7);
+ X[7] ^= X[12];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 4, X);
+ InjectKey(2 * r - 1);
+
+ X[0] += X[1];
+ X[1] = RotL_64(X[1], R1024_4_0);
+ X[1] ^= X[0];
+ X[2] += X[3];
+ X[3] = RotL_64(X[3], R1024_4_1);
+ X[3] ^= X[2];
+ X[4] += X[5];
+ X[5] = RotL_64(X[5], R1024_4_2);
+ X[5] ^= X[4];
+ X[6] += X[7];
+ X[7] = RotL_64(X[7], R1024_4_3);
+ X[7] ^= X[6];
+ X[8] += X[9];
+ X[9] = RotL_64(X[9], R1024_4_4);
+ X[9] ^= X[8];
+ X[10] += X[11];
+ X[11] = RotL_64(X[11], R1024_4_5);
+ X[11] ^= X[10];
+ X[12] += X[13];
+ X[13] = RotL_64(X[13], R1024_4_6);
+ X[13] ^= X[12];
+ X[14] += X[15];
+ X[15] = RotL_64(X[15], R1024_4_7);
+ X[15] ^= X[14];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 3, X);
+
+ X[0] += X[9];
+ X[9] = RotL_64(X[9], R1024_5_0);
+ X[9] ^= X[0];
+ X[2] += X[13];
+ X[13] = RotL_64(X[13], R1024_5_1);
+ X[13] ^= X[2];
+ X[6] += X[11];
+ X[11] = RotL_64(X[11], R1024_5_2);
+ X[11] ^= X[6];
+ X[4] += X[15];
+ X[15] = RotL_64(X[15], R1024_5_3);
+ X[15] ^= X[4];
+ X[10] += X[7];
+ X[7] = RotL_64(X[7], R1024_5_4);
+ X[7] ^= X[10];
+ X[12] += X[3];
+ X[3] = RotL_64(X[3], R1024_5_5);
+ X[3] ^= X[12];
+ X[14] += X[5];
+ X[5] = RotL_64(X[5], R1024_5_6);
+ X[5] ^= X[14];
+ X[8] += X[1];
+ X[1] = RotL_64(X[1], R1024_5_7);
+ X[1] ^= X[8];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 2, X);
+
+ X[0] += X[7];
+ X[7] = RotL_64(X[7], R1024_6_0);
+ X[7] ^= X[0];
+ X[2] += X[5];
+ X[5] = RotL_64(X[5], R1024_6_1);
+ X[5] ^= X[2];
+ X[4] += X[3];
+ X[3] = RotL_64(X[3], R1024_6_2);
+ X[3] ^= X[4];
+ X[6] += X[1];
+ X[1] = RotL_64(X[1], R1024_6_3);
+ X[1] ^= X[6];
+ X[12] += X[15];
+ X[15] = RotL_64(X[15], R1024_6_4);
+ X[15] ^= X[12];
+ X[14] += X[13];
+ X[13] = RotL_64(X[13], R1024_6_5);
+ X[13] ^= X[14];
+ X[8] += X[11];
+ X[11] = RotL_64(X[11], R1024_6_6);
+ X[11] ^= X[8];
+ X[10] += X[9];
+ X[9] = RotL_64(X[9], R1024_6_7);
+ X[9] ^= X[10];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 1, X);
+
+ X[0] += X[15];
+ X[15] = RotL_64(X[15], R1024_7_0);
+ X[15] ^= X[0];
+ X[2] += X[11];
+ X[11] = RotL_64(X[11], R1024_7_1);
+ X[11] ^= X[2];
+ X[6] += X[13];
+ X[13] = RotL_64(X[13], R1024_7_2);
+ X[13] ^= X[6];
+ X[4] += X[9];
+ X[9] = RotL_64(X[9], R1024_7_3);
+ X[9] ^= X[4];
+ X[14] += X[1];
+ X[1] = RotL_64(X[1], R1024_7_4);
+ X[1] ^= X[14];
+ X[8] += X[5];
+ X[5] = RotL_64(X[5], R1024_7_5);
+ X[5] ^= X[8];
+ X[10] += X[3];
+ X[3] = RotL_64(X[3], R1024_7_6);
+ X[3] ^= X[10];
+ X[12] += X[7];
+ X[7] = RotL_64(X[7], R1024_7_7);
+ X[7] ^= X[12];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r, X);
+ InjectKey(2 * r);
+ }
+ /* do the final "feedforward" xor, update context chaining vars */
+ for (i = 0; i < WCNT; i++)
+ ctx->X[i] = X[i] ^ w[i];
+ Skein_Show_Round(BLK_BITS, &ctx->h, SKEIN_RND_FEED_FWD, ctx->X);
+
+ Skein_Clear_First_Flag(ctx->h); /* clear the start bit */
+ blkPtr += SKEIN1024_BLOCK_BYTES;
+ }
+ while (--blkCnt);
+}
+
+/*****************************************************************/
+/* 1024-bit Skein */
+/*****************************************************************/
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* init the context for a straight hashing operation */
+static int Skein1024_Init(struct skein1024_ctx *ctx, size_t hashBitLen)
+{
+ union {
+ u8 b[SKEIN1024_STATE_BYTES];
+ u64 w[SKEIN1024_STATE_WORDS];
+ } cfg; /* config block */
+
+ Skein_Assert(hashBitLen > 0, SKEIN_BAD_HASHLEN);
+
+ /* build/process config block for hashing */
+ ctx->h.hashBitLen = hashBitLen; /* output hash byte count */
+ Skein_Start_New_Type(ctx, CFG_FINAL); /* set tweaks: T0=0; T1=CFG | FINAL */
+
+ memset(&cfg.w, 0, sizeof(cfg.w)); /* pre-pad cfg.w[] with zeroes */
+ cfg.w[0] = Skein_Swap64(SKEIN_SCHEMA_VER); /* set the schema, version */
+ cfg.w[1] = Skein_Swap64(hashBitLen); /* hash result length in bits */
+ cfg.w[2] = Skein_Swap64(SKEIN_CFG_TREE_INFO_SEQUENTIAL);
+
+ /* compute the initial chaining values from config block */
+ memset(ctx->X, 0, sizeof(ctx->X)); /* zero the chaining variables */
+ Skein1024_Process_Block(ctx, cfg.b, 1, sizeof(cfg));
+
+ /* The chaining vars ctx->X are now initialized for the given hashBitLen. */
+ /* Set up to process the data message portion of the hash (default) */
+ ctx->h.bCnt = 0; /* buffer b[] starts out empty */
+ Skein_Start_New_Type(ctx, MSG); /* T0=0, T1= MSG type */
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* process the input bytes */
+static int Skein1024_Update(struct skein1024_ctx *ctx, const u8 * msg,
+ size_t msgByteCnt)
+{
+ size_t n;
+
+ Skein_Assert(ctx->h.bCnt <= SKEIN1024_BLOCK_BYTES, SKEIN_FAIL); /* catch uninitialized context */
+
+ /* process full blocks, if any */
+ if (msgByteCnt + ctx->h.bCnt > SKEIN1024_BLOCK_BYTES) {
+ if (ctx->h.bCnt) { /* finish up any buffered message data */
+ n = SKEIN1024_BLOCK_BYTES - ctx->h.bCnt; /* # bytes free in buffer b[] */
+ if (n) {
+ Skein_assert(n < msgByteCnt); /* check on our logic here */
+ memcpy(&ctx->b[ctx->h.bCnt], msg, n);
+ msgByteCnt -= n;
+ msg += n;
+ ctx->h.bCnt += n;
+ }
+ Skein_assert(ctx->h.bCnt == SKEIN1024_BLOCK_BYTES);
+ Skein1024_Process_Block(ctx, ctx->b, 1,
+ SKEIN1024_BLOCK_BYTES);
+ ctx->h.bCnt = 0;
+ }
+ /* now process any remaining full blocks, directly from input message data */
+ if (msgByteCnt > SKEIN1024_BLOCK_BYTES) {
+ n = (msgByteCnt - 1) / SKEIN1024_BLOCK_BYTES; /* number of full blocks to process */
+ Skein1024_Process_Block(ctx, msg, n,
+ SKEIN1024_BLOCK_BYTES);
+ msgByteCnt -= n * SKEIN1024_BLOCK_BYTES;
+ msg += n * SKEIN1024_BLOCK_BYTES;
+ }
+ Skein_assert(ctx->h.bCnt == 0);
+ }
+
+ /* copy any remaining source message data bytes into b[] */
+ if (msgByteCnt) {
+ Skein_assert(msgByteCnt + ctx->h.bCnt <= SKEIN1024_BLOCK_BYTES);
+ memcpy(&ctx->b[ctx->h.bCnt], msg, msgByteCnt);
+ ctx->h.bCnt += msgByteCnt;
+ }
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* finalize the hash computation and output the result */
+static int Skein1024_Final(struct skein1024_ctx *ctx, u8 * hashVal)
+{
+ size_t i, n, byteCnt;
+ u64 X[SKEIN1024_STATE_WORDS];
+ Skein_Assert(ctx->h.bCnt <= SKEIN1024_BLOCK_BYTES, SKEIN_FAIL); /* catch uninitialized context */
+
+ ctx->h.T[1] |= SKEIN_T1_FLAG_FINAL; /* tag as the final block */
+ if (ctx->h.bCnt < SKEIN1024_BLOCK_BYTES) /* zero pad b[] if necessary */
+ memset(&ctx->b[ctx->h.bCnt], 0,
+ SKEIN1024_BLOCK_BYTES - ctx->h.bCnt);
+
+ Skein1024_Process_Block(ctx, ctx->b, 1, ctx->h.bCnt); /* process the final block */
+
+ /* now output the result */
+ byteCnt = (ctx->h.hashBitLen + 7) >> 3; /* total number of output bytes */
+
+ /* run Threefish in "counter mode" to generate output */
+ memset(ctx->b, 0, sizeof(ctx->b)); /* zero out b[], so it can hold the counter */
+ memcpy(X, ctx->X, sizeof(X)); /* keep a local copy of counter mode "key" */
+ for (i = 0; i * SKEIN1024_BLOCK_BYTES < byteCnt; i++) {
+ ((u64 *) ctx->b)[0] = Skein_Swap64((u64) i); /* build the counter block */
+ Skein_Start_New_Type(ctx, OUT_FINAL);
+ Skein1024_Process_Block(ctx, ctx->b, 1, sizeof(u64)); /* run "counter mode" */
+ n = byteCnt - i * SKEIN1024_BLOCK_BYTES; /* number of output bytes left to go */
+ if (n >= SKEIN1024_BLOCK_BYTES)
+ n = SKEIN1024_BLOCK_BYTES;
+ Skein_Put64_LSB_First(hashVal + i * SKEIN1024_BLOCK_BYTES, ctx->X, n); /* "output" the ctr mode bytes */
+ Skein_Show_Final(1024, &ctx->h, n,
+ hashVal + i * SKEIN1024_BLOCK_BYTES);
+ memcpy(ctx->X, X, sizeof(X)); /* restore the counter mode key for next time */
+ }
+ return SKEIN_SUCCESS;
+}
+
+static void skein1024_init(struct crypto_tfm *tfm)
+{
+ struct skein1024_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ Skein1024_Init(sctx, SKEIN1024_DIGEST_BITS);
+}
+
+static void skein1024_update(struct crypto_tfm *tfm, const u8 * data,
+ unsigned int len)
+{
+ struct skein1024_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ Skein1024_Update(sctx, data, len);
+}
+
+static void skein1024_final(struct crypto_tfm *tfm, u8 * out)
+{
+ struct skein1024_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ Skein1024_Final(sctx, out);
+}
+
+static struct crypto_alg skein1024 = {
+ .cra_name = "skein1024",
+ .cra_driver_name = "skein1024-generic",
+ .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
+ .cra_blocksize = SKEIN1024_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct skein1024_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_alignmask = 3,
+ .cra_list = LIST_HEAD_INIT(skein1024.cra_list),
+ .cra_u = {.digest = {
+ .dia_digestsize = SKEIN1024_DIGEST_SIZE,
+ .dia_init = skein1024_init,
+ .dia_update = skein1024_update,
+ .dia_final = skein1024_final}}
+};
+
+static int __init skein1024_generic_mod_init(void)
+{
+ int ret;
+
+ ret = crypto_register_alg(&skein1024);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static void __exit skein1024_generic_mod_fini(void)
+{
+ crypto_unregister_alg(&skein1024);
+}
+
+module_init(skein1024_generic_mod_init);
+module_exit(skein1024_generic_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Skein-1024 Secure Hash Algorithm");
+
+MODULE_ALIAS("skein1024");
diff --git a/crypto/skein256_generic.c b/crypto/skein256_generic.c
new file mode 100644
index 0000000..45adf6c
--- /dev/null
+++ b/crypto/skein256_generic.c
@@ -0,0 +1,367 @@
+/***********************************************************************
+**
+** Implementation of the Skein hash function.
+**
+** Source code author: Doug Whiting, 2008.
+**
+** This algorithm and source code is released to the public domain.
+**
+************************************************************************/
+
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include "skein.h" /* get the Skein API definitions */
+
+#define SKEIN256_BLOCK_SIZE SKEIN_256_BLOCK_BYTES
+#define SKEIN256_DIGEST_BITS 256
+#define SKEIN256_DIGEST_SIZE (SKEIN256_DIGEST_BITS / 8)
+
+static int Skein_256_Init(struct skein256_ctx * ctx, size_t hashBitLen);
+static int Skein_256_Update(struct skein256_ctx * ctx, const u8 * msg, size_t msgByteCnt);
+static int Skein_256_Final(struct skein256_ctx * ctx, u8 * hashVal);
+
+/*****************************************************************/
+/* Portable (i.e., slow) endianness conversion functions */
+static u64 Skein_Swap64(u64 w64)
+{ /* instantiate the function body here */
+ static const u64 ONE = 1; /* use this to check endianness */
+
+ /* figure out endianness "on-the-fly" */
+ if (1 == ((u8 *) & ONE)[0])
+ return w64; /* little-endian is fast */
+ else
+ return ((w64 & 0xFF) << 56) | /* big-endian is slow */
+ (((w64 >> 8) & 0xFF) << 48) |
+ (((w64 >> 16) & 0xFF) << 40) |
+ (((w64 >> 24) & 0xFF) << 32) |
+ (((w64 >> 32) & 0xFF) << 24) |
+ (((w64 >> 40) & 0xFF) << 16) |
+ (((w64 >> 48) & 0xFF) << 8) | (((w64 >> 56) & 0xFF));
+}
+
+static void Skein_Put64_LSB_First(u8 * dst, const u64 * src, size_t bCnt)
+{ /* this version is fully portable (big-endian or little-endian), but slow */
+ size_t n;
+
+ for (n = 0; n < bCnt; n++)
+ dst[n] = (u8) (src[n >> 3] >> (8 * (n & 7)));
+}
+
+static void Skein_Get64_LSB_First(u64 * dst, const u8 * src, size_t wCnt)
+{ /* this version is fully portable (big-endian or little-endian), but slow */
+ size_t n;
+
+ for (n = 0; n < 8 * wCnt; n += 8)
+ dst[n / 8] = (((u64) src[n])) +
+ (((u64) src[n + 1]) << 8) +
+ (((u64) src[n + 2]) << 16) +
+ (((u64) src[n + 3]) << 24) +
+ (((u64) src[n + 4]) << 32) +
+ (((u64) src[n + 5]) << 40) +
+ (((u64) src[n + 6]) << 48) + (((u64) src[n + 7]) << 56);
+}
+
+/* 64-bit rotate left */
+static u64 RotL_64(u64 x, unsigned int N)
+{
+ return (x << (N & 63)) | (x >> ((64 - N) & 63));
+}
+
+#define BLK_BITS (WCNT*64)
+
+/* macro to perform a key injection (same for all block sizes) */
+#define InjectKey(r) \
+ for (i=0;i < WCNT;i++) \
+ X[i] += ks[((r)+i) % (WCNT+1)]; \
+ X[WCNT-3] += ts[((r)+0) % 3]; \
+ X[WCNT-2] += ts[((r)+1) % 3]; \
+ X[WCNT-1] += (r); /* avoid slide attacks */ \
+ Skein_Show_Round(BLK_BITS,&ctx->h,SKEIN_RND_KEY_INJECT,X);
+
+static void Skein_256_Process_Block(struct skein256_ctx *ctx, const u8 *blkPtr,
+ size_t blkCnt, size_t byteCntAdd)
+{ /* do it in C */
+ enum {
+ WCNT = SKEIN_256_STATE_WORDS
+ };
+ size_t i, r;
+ u64 ts[3]; /* key schedule: tweak */
+ u64 ks[WCNT + 1]; /* key schedule: chaining vars */
+ u64 X[WCNT]; /* local copy of context vars */
+ u64 w[WCNT]; /* local copy of input block */
+
+ Skein_assert(blkCnt != 0); /* never call with blkCnt == 0! */
+ do {
+ /* this implementation only supports 2**64 input bytes (no carry out here) */
+ ctx->h.T[0] += byteCntAdd; /* update processed length */
+
+ /* precompute the key schedule for this block */
+ ks[WCNT] = SKEIN_KS_PARITY;
+ for (i = 0; i < WCNT; i++) {
+ ks[i] = ctx->X[i];
+ ks[WCNT] ^= ctx->X[i]; /* compute overall parity */
+ }
+ ts[0] = ctx->h.T[0];
+ ts[1] = ctx->h.T[1];
+ ts[2] = ts[0] ^ ts[1];
+
+ Skein_Get64_LSB_First(w, blkPtr, WCNT); /* get input block in little-endian format */
+ Skein_Show_Block(BLK_BITS, &ctx->h, ctx->X, blkPtr, w, ks, ts);
+ for (i = 0; i < WCNT; i++) { /* do the first full key injection */
+ X[i] = w[i] + ks[i];
+ }
+ X[WCNT - 3] += ts[0];
+ X[WCNT - 2] += ts[1];
+
+ Skein_Show_Round(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INITIAL, X); /* show starting state values */
+
+ for (r = 1; r <= SKEIN_256_ROUNDS_TOTAL / 8; r++) { /* unroll 8 rounds */
+ X[0] += X[1];
+ X[1] = RotL_64(X[1], R_256_0_0);
+ X[1] ^= X[0];
+ X[2] += X[3];
+ X[3] = RotL_64(X[3], R_256_0_1);
+ X[3] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 7, X);
+
+ X[0] += X[3];
+ X[3] = RotL_64(X[3], R_256_1_0);
+ X[3] ^= X[0];
+ X[2] += X[1];
+ X[1] = RotL_64(X[1], R_256_1_1);
+ X[1] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 6, X);
+
+ X[0] += X[1];
+ X[1] = RotL_64(X[1], R_256_2_0);
+ X[1] ^= X[0];
+ X[2] += X[3];
+ X[3] = RotL_64(X[3], R_256_2_1);
+ X[3] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 5, X);
+
+ X[0] += X[3];
+ X[3] = RotL_64(X[3], R_256_3_0);
+ X[3] ^= X[0];
+ X[2] += X[1];
+ X[1] = RotL_64(X[1], R_256_3_1);
+ X[1] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 4, X);
+ InjectKey(2 * r - 1);
+
+ X[0] += X[1];
+ X[1] = RotL_64(X[1], R_256_4_0);
+ X[1] ^= X[0];
+ X[2] += X[3];
+ X[3] = RotL_64(X[3], R_256_4_1);
+ X[3] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 3, X);
+
+ X[0] += X[3];
+ X[3] = RotL_64(X[3], R_256_5_0);
+ X[3] ^= X[0];
+ X[2] += X[1];
+ X[1] = RotL_64(X[1], R_256_5_1);
+ X[1] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 2, X);
+
+ X[0] += X[1];
+ X[1] = RotL_64(X[1], R_256_6_0);
+ X[1] ^= X[0];
+ X[2] += X[3];
+ X[3] = RotL_64(X[3], R_256_6_1);
+ X[3] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 1, X);
+
+ X[0] += X[3];
+ X[3] = RotL_64(X[3], R_256_7_0);
+ X[3] ^= X[0];
+ X[2] += X[1];
+ X[1] = RotL_64(X[1], R_256_7_1);
+ X[1] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r, X);
+ InjectKey(2 * r);
+ }
+ /* do the final "feedforward" xor, update context chaining vars */
+ for (i = 0; i < WCNT; i++)
+ ctx->X[i] = X[i] ^ w[i];
+ Skein_Show_Round(BLK_BITS, &ctx->h, SKEIN_RND_FEED_FWD, ctx->X);
+
+ Skein_Clear_First_Flag(ctx->h); /* clear the start bit */
+ blkPtr += SKEIN_256_BLOCK_BYTES;
+ }
+ while (--blkCnt);
+}
+
+/*****************************************************************/
+/* 256-bit Skein */
+/*****************************************************************/
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* init the context for a straight hashing operation */
+static int Skein_256_Init(struct skein256_ctx *ctx, size_t hashBitLen)
+{
+ union {
+ u8 b[SKEIN_256_STATE_BYTES];
+ u64 w[SKEIN_256_STATE_WORDS];
+ } cfg; /* config block */
+
+ Skein_Assert(hashBitLen > 0, SKEIN_BAD_HASHLEN);
+
+ /* build/process config block for hashing */
+ ctx->h.hashBitLen = hashBitLen; /* output hash byte count */
+ Skein_Start_New_Type(ctx, CFG_FINAL); /* set tweaks: T0=0; T1=CFG | FINAL */
+
+ memset(&cfg.w, 0, sizeof(cfg.w)); /* pre-pad cfg.w[] with zeroes */
+ cfg.w[0] = Skein_Swap64(SKEIN_SCHEMA_VER); /* set the schema, version */
+ cfg.w[1] = Skein_Swap64(hashBitLen); /* hash result length in bits */
+ cfg.w[2] = Skein_Swap64(SKEIN_CFG_TREE_INFO_SEQUENTIAL);
+
+ /* compute the initial chaining values from config block */
+ memset(ctx->X, 0, sizeof(ctx->X)); /* zero the chaining variables */
+ Skein_256_Process_Block(ctx, cfg.b, 1, sizeof(cfg));
+
+ /* The chaining vars ctx->X are now initialized for the given hashBitLen. */
+ /* Set up to process the data message portion of the hash (default) */
+ ctx->h.bCnt = 0; /* buffer b[] starts out empty */
+ Skein_Start_New_Type(ctx, MSG); /* T0=0, T1= MSG type */
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* process the input bytes */
+static int Skein_256_Update(struct skein256_ctx *ctx, const u8 * msg,
+ size_t msgByteCnt)
+{
+ size_t n;
+
+ Skein_Assert(ctx->h.bCnt <= SKEIN_256_BLOCK_BYTES, SKEIN_FAIL); /* catch uninitialized context */
+
+ /* process full blocks, if any */
+ if (msgByteCnt + ctx->h.bCnt > SKEIN_256_BLOCK_BYTES) {
+ if (ctx->h.bCnt) { /* finish up any buffered message data */
+ n = SKEIN_256_BLOCK_BYTES - ctx->h.bCnt; /* # bytes free in buffer b[] */
+ if (n) {
+ Skein_assert(n < msgByteCnt); /* check on our logic here */
+ memcpy(&ctx->b[ctx->h.bCnt], msg, n);
+ msgByteCnt -= n;
+ msg += n;
+ ctx->h.bCnt += n;
+ }
+ Skein_assert(ctx->h.bCnt == SKEIN_256_BLOCK_BYTES);
+ Skein_256_Process_Block(ctx, ctx->b, 1,
+ SKEIN_256_BLOCK_BYTES);
+ ctx->h.bCnt = 0;
+ }
+ /* now process any remaining full blocks, directly from input message data */
+ if (msgByteCnt > SKEIN_256_BLOCK_BYTES) {
+ n = (msgByteCnt - 1) / SKEIN_256_BLOCK_BYTES; /* number of full blocks to process */
+ Skein_256_Process_Block(ctx, msg, n,
+ SKEIN_256_BLOCK_BYTES);
+ msgByteCnt -= n * SKEIN_256_BLOCK_BYTES;
+ msg += n * SKEIN_256_BLOCK_BYTES;
+ }
+ Skein_assert(ctx->h.bCnt == 0);
+ }
+
+ /* copy any remaining source message data bytes into b[] */
+ if (msgByteCnt) {
+ Skein_assert(msgByteCnt + ctx->h.bCnt <= SKEIN_256_BLOCK_BYTES);
+ memcpy(&ctx->b[ctx->h.bCnt], msg, msgByteCnt);
+ ctx->h.bCnt += msgByteCnt;
+ }
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* finalize the hash computation and output the result */
+static int Skein_256_Final(struct skein256_ctx *ctx, u8 * hashVal)
+{
+ size_t i, n, byteCnt;
+ u64 X[SKEIN_256_STATE_WORDS];
+ Skein_Assert(ctx->h.bCnt <= SKEIN_256_BLOCK_BYTES, SKEIN_FAIL); /* catch uninitialized context */
+
+ ctx->h.T[1] |= SKEIN_T1_FLAG_FINAL; /* tag as the final block */
+ if (ctx->h.bCnt < SKEIN_256_BLOCK_BYTES) /* zero pad b[] if necessary */
+ memset(&ctx->b[ctx->h.bCnt], 0,
+ SKEIN_256_BLOCK_BYTES - ctx->h.bCnt);
+ Skein_256_Process_Block(ctx, ctx->b, 1, ctx->h.bCnt); /* process the final block */
+
+ /* now output the result */
+ byteCnt = (ctx->h.hashBitLen + 7) >> 3; /* total number of output bytes */
+
+ /* run Threefish in "counter mode" to generate output */
+ memset(ctx->b, 0, sizeof(ctx->b)); /* zero out b[], so it can hold the counter */
+ memcpy(X, ctx->X, sizeof(X)); /* keep a local copy of counter mode "key" */
+ for (i = 0; i * SKEIN_256_BLOCK_BYTES < byteCnt; i++) {
+ ((u64 *) ctx->b)[0] = Skein_Swap64((u64) i); /* build the counter block */
+ Skein_Start_New_Type(ctx, OUT_FINAL);
+ Skein_256_Process_Block(ctx, ctx->b, 1, sizeof(u64)); /* run "counter mode" */
+ n = byteCnt - i * SKEIN_256_BLOCK_BYTES; /* number of output bytes left to go */
+ if (n >= SKEIN_256_BLOCK_BYTES)
+ n = SKEIN_256_BLOCK_BYTES;
+ Skein_Put64_LSB_First(hashVal + i * SKEIN_256_BLOCK_BYTES, ctx->X, n); /* "output" the ctr mode bytes */
+ Skein_Show_Final(256, &ctx->h, n,
+ hashVal + i * SKEIN_256_BLOCK_BYTES);
+ memcpy(ctx->X, X, sizeof(X)); /* restore the counter mode key for next time */
+ }
+ return SKEIN_SUCCESS;
+}
+
+static void skein256_init(struct crypto_tfm *tfm)
+{
+ struct skein256_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ Skein_256_Init(sctx, SKEIN256_DIGEST_BITS);
+}
+
+static void skein256_update(struct crypto_tfm *tfm, const u8 * data,
+ unsigned int len)
+{
+ struct skein256_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ Skein_256_Update(sctx, data, len);
+}
+
+static void skein256_final(struct crypto_tfm *tfm, u8 * out)
+{
+ struct skein256_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ Skein_256_Final(sctx, out);
+}
+
+static struct crypto_alg skein256 = {
+ .cra_name = "skein256",
+ .cra_driver_name = "skein256-generic",
+ .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
+ .cra_blocksize = SKEIN256_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct skein256_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_alignmask = 3,
+ .cra_list = LIST_HEAD_INIT(skein256.cra_list),
+ .cra_u = {.digest = {
+ .dia_digestsize = SKEIN256_DIGEST_SIZE,
+ .dia_init = skein256_init,
+ .dia_update = skein256_update,
+ .dia_final = skein256_final}}
+};
+
+static int __init skein256_generic_mod_init(void)
+{
+ return crypto_register_alg(&skein256);
+}
+
+static void __exit skein256_generic_mod_fini(void)
+{
+ crypto_unregister_alg(&skein256);
+}
+
+module_init(skein256_generic_mod_init);
+module_exit(skein256_generic_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Skein-256 Secure Hash Algorithm");
+
+MODULE_ALIAS("skein256");
diff --git a/crypto/skein512_generic.c b/crypto/skein512_generic.c
new file mode 100644
index 0000000..7ea8e71
--- /dev/null
+++ b/crypto/skein512_generic.c
@@ -0,0 +1,417 @@
+/***********************************************************************
+**
+** Implementation of the Skein hash function.
+**
+** Source code author: Doug Whiting, 2008.
+**
+** This algorithm and source code is released to the public domain.
+**
+************************************************************************/
+
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include "skein.h" /* get the Skein API definitions */
+
+#define SKEIN512_BLOCK_SIZE SKEIN_512_BLOCK_BYTES
+#define SKEIN512_DIGEST_BITS 512
+#define SKEIN512_DIGEST_SIZE (SKEIN512_DIGEST_BITS / 8)
+
+static int Skein_512_Init(struct skein512_ctx * ctx, size_t hashBitLen);
+static int Skein_512_Update(struct skein512_ctx * ctx, const u8 * msg, size_t msgByteCnt);
+static int Skein_512_Final(struct skein512_ctx * ctx, u8 * hashVal);
+
+/*****************************************************************/
+/* Portable (i.e., slow) endianness conversion functions */
+static u64 Skein_Swap64(u64 w64)
+{ /* instantiate the function body here */
+ static const u64 ONE = 1; /* use this to check endianness */
+
+ /* figure out endianness "on-the-fly" */
+ if (1 == ((u8 *) & ONE)[0])
+ return w64; /* little-endian is fast */
+ else
+ return ((w64 & 0xFF) << 56) | /* big-endian is slow */
+ (((w64 >> 8) & 0xFF) << 48) |
+ (((w64 >> 16) & 0xFF) << 40) |
+ (((w64 >> 24) & 0xFF) << 32) |
+ (((w64 >> 32) & 0xFF) << 24) |
+ (((w64 >> 40) & 0xFF) << 16) |
+ (((w64 >> 48) & 0xFF) << 8) | (((w64 >> 56) & 0xFF));
+}
+
+static void Skein_Put64_LSB_First(u8 * dst, const u64 * src, size_t bCnt)
+{ /* this version is fully portable (big-endian or little-endian), but slow */
+ size_t n;
+
+ for (n = 0; n < bCnt; n++)
+ dst[n] = (u8) (src[n >> 3] >> (8 * (n & 7)));
+}
+
+static void Skein_Get64_LSB_First(u64 * dst, const u8 * src, size_t wCnt)
+{ /* this version is fully portable (big-endian or little-endian), but slow */
+ size_t n;
+
+ for (n = 0; n < 8 * wCnt; n += 8)
+ dst[n / 8] = (((u64) src[n])) +
+ (((u64) src[n + 1]) << 8) +
+ (((u64) src[n + 2]) << 16) +
+ (((u64) src[n + 3]) << 24) +
+ (((u64) src[n + 4]) << 32) +
+ (((u64) src[n + 5]) << 40) +
+ (((u64) src[n + 6]) << 48) + (((u64) src[n + 7]) << 56);
+}
+
+/* 64-bit rotate left */
+static u64 RotL_64(u64 x, unsigned int N)
+{
+ return (x << (N & 63)) | (x >> ((64 - N) & 63));
+}
+
+#define BLK_BITS (WCNT*64)
+
+/* macro to perform a key injection (same for all block sizes) */
+#define InjectKey(r) \
+ for (i=0;i < WCNT;i++) \
+ X[i] += ks[((r)+i) % (WCNT+1)]; \
+ X[WCNT-3] += ts[((r)+0) % 3]; \
+ X[WCNT-2] += ts[((r)+1) % 3]; \
+ X[WCNT-1] += (r); /* avoid slide attacks */ \
+ Skein_Show_Round(BLK_BITS,&ctx->h,SKEIN_RND_KEY_INJECT,X);
+
+static void Skein_512_Process_Block(struct skein512_ctx *ctx, const u8 *blkPtr,
+ size_t blkCnt, size_t byteCntAdd)
+{ /* do it in C */
+ enum {
+ WCNT = SKEIN_512_STATE_WORDS
+ };
+
+ size_t i, r;
+ u64 ts[3]; /* key schedule: tweak */
+ u64 ks[WCNT + 1]; /* key schedule: chaining vars */
+ u64 X[WCNT]; /* local copy of vars */
+ u64 w[WCNT]; /* local copy of input block */
+
+ Skein_assert(blkCnt != 0); /* never call with blkCnt == 0! */
+ do {
+ /* this implementation only supports 2**64 input bytes (no carry out here) */
+ ctx->h.T[0] += byteCntAdd; /* update processed length */
+
+ /* precompute the key schedule for this block */
+ ks[WCNT] = SKEIN_KS_PARITY;
+ for (i = 0; i < WCNT; i++) {
+ ks[i] = ctx->X[i];
+ ks[WCNT] ^= ctx->X[i]; /* compute overall parity */
+ }
+ ts[0] = ctx->h.T[0];
+ ts[1] = ctx->h.T[1];
+ ts[2] = ts[0] ^ ts[1];
+
+ Skein_Get64_LSB_First(w, blkPtr, WCNT); /* get input block in little-endian format */
+ Skein_Show_Block(BLK_BITS, &ctx->h, ctx->X, blkPtr, w, ks, ts);
+ for (i = 0; i < WCNT; i++) { /* do the first full key injection */
+ X[i] = w[i] + ks[i];
+ }
+ X[WCNT - 3] += ts[0];
+ X[WCNT - 2] += ts[1];
+
+ Skein_Show_Round(BLK_BITS, &ctx->h, SKEIN_RND_KEY_INITIAL, X);
+ for (r = 1; r <= SKEIN_512_ROUNDS_TOTAL / 8; r++) { /* unroll 8 rounds */
+ X[0] += X[1];
+ X[1] = RotL_64(X[1], R_512_0_0);
+ X[1] ^= X[0];
+ X[2] += X[3];
+ X[3] = RotL_64(X[3], R_512_0_1);
+ X[3] ^= X[2];
+ X[4] += X[5];
+ X[5] = RotL_64(X[5], R_512_0_2);
+ X[5] ^= X[4];
+ X[6] += X[7];
+ X[7] = RotL_64(X[7], R_512_0_3);
+ X[7] ^= X[6];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 7, X);
+
+ X[2] += X[1];
+ X[1] = RotL_64(X[1], R_512_1_0);
+ X[1] ^= X[2];
+ X[4] += X[7];
+ X[7] = RotL_64(X[7], R_512_1_1);
+ X[7] ^= X[4];
+ X[6] += X[5];
+ X[5] = RotL_64(X[5], R_512_1_2);
+ X[5] ^= X[6];
+ X[0] += X[3];
+ X[3] = RotL_64(X[3], R_512_1_3);
+ X[3] ^= X[0];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 6, X);
+
+ X[4] += X[1];
+ X[1] = RotL_64(X[1], R_512_2_0);
+ X[1] ^= X[4];
+ X[6] += X[3];
+ X[3] = RotL_64(X[3], R_512_2_1);
+ X[3] ^= X[6];
+ X[0] += X[5];
+ X[5] = RotL_64(X[5], R_512_2_2);
+ X[5] ^= X[0];
+ X[2] += X[7];
+ X[7] = RotL_64(X[7], R_512_2_3);
+ X[7] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 5, X);
+
+ X[6] += X[1];
+ X[1] = RotL_64(X[1], R_512_3_0);
+ X[1] ^= X[6];
+ X[0] += X[7];
+ X[7] = RotL_64(X[7], R_512_3_1);
+ X[7] ^= X[0];
+ X[2] += X[5];
+ X[5] = RotL_64(X[5], R_512_3_2);
+ X[5] ^= X[2];
+ X[4] += X[3];
+ X[3] = RotL_64(X[3], R_512_3_3);
+ X[3] ^= X[4];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 4, X);
+ InjectKey(2 * r - 1);
+
+ X[0] += X[1];
+ X[1] = RotL_64(X[1], R_512_4_0);
+ X[1] ^= X[0];
+ X[2] += X[3];
+ X[3] = RotL_64(X[3], R_512_4_1);
+ X[3] ^= X[2];
+ X[4] += X[5];
+ X[5] = RotL_64(X[5], R_512_4_2);
+ X[5] ^= X[4];
+ X[6] += X[7];
+ X[7] = RotL_64(X[7], R_512_4_3);
+ X[7] ^= X[6];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 3, X);
+
+ X[2] += X[1];
+ X[1] = RotL_64(X[1], R_512_5_0);
+ X[1] ^= X[2];
+ X[4] += X[7];
+ X[7] = RotL_64(X[7], R_512_5_1);
+ X[7] ^= X[4];
+ X[6] += X[5];
+ X[5] = RotL_64(X[5], R_512_5_2);
+ X[5] ^= X[6];
+ X[0] += X[3];
+ X[3] = RotL_64(X[3], R_512_5_3);
+ X[3] ^= X[0];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 2, X);
+
+ X[4] += X[1];
+ X[1] = RotL_64(X[1], R_512_6_0);
+ X[1] ^= X[4];
+ X[6] += X[3];
+ X[3] = RotL_64(X[3], R_512_6_1);
+ X[3] ^= X[6];
+ X[0] += X[5];
+ X[5] = RotL_64(X[5], R_512_6_2);
+ X[5] ^= X[0];
+ X[2] += X[7];
+ X[7] = RotL_64(X[7], R_512_6_3);
+ X[7] ^= X[2];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r - 1, X);
+
+ X[6] += X[1];
+ X[1] = RotL_64(X[1], R_512_7_0);
+ X[1] ^= X[6];
+ X[0] += X[7];
+ X[7] = RotL_64(X[7], R_512_7_1);
+ X[7] ^= X[0];
+ X[2] += X[5];
+ X[5] = RotL_64(X[5], R_512_7_2);
+ X[5] ^= X[2];
+ X[4] += X[3];
+ X[3] = RotL_64(X[3], R_512_7_3);
+ X[3] ^= X[4];
+ Skein_Show_Round(BLK_BITS, &ctx->h, 8 * r, X);
+ InjectKey(2 * r);
+ }
+ /* do the final "feedforward" xor, update context chaining vars */
+ for (i = 0; i < WCNT; i++)
+ ctx->X[i] = X[i] ^ w[i];
+ Skein_Show_Round(BLK_BITS, &ctx->h, SKEIN_RND_FEED_FWD, ctx->X);
+
+ Skein_Clear_First_Flag(ctx->h); /* clear the start bit */
+ blkPtr += SKEIN_512_BLOCK_BYTES;
+ }
+ while (--blkCnt);
+}
+
+/*****************************************************************/
+/* 512-bit Skein */
+/*****************************************************************/
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* init the context for a straight hashing operation */
+static int Skein_512_Init(struct skein512_ctx *ctx, size_t hashBitLen)
+{
+ union {
+ u8 b[SKEIN_512_STATE_BYTES];
+ u64 w[SKEIN_512_STATE_WORDS];
+ } cfg; /* config block */
+
+ Skein_Assert(hashBitLen > 0, SKEIN_BAD_HASHLEN);
+
+ /* build/process config block for hashing */
+ ctx->h.hashBitLen = hashBitLen; /* output hash byte count */
+ Skein_Start_New_Type(ctx, CFG_FINAL); /* set tweaks: T0=0; T1=CFG | FINAL */
+
+ memset(&cfg.w, 0, sizeof(cfg.w)); /* pre-pad cfg.w[] with zeroes */
+ cfg.w[0] = Skein_Swap64(SKEIN_SCHEMA_VER); /* set the schema, version */
+ cfg.w[1] = Skein_Swap64(hashBitLen); /* hash result length in bits */
+ cfg.w[2] = Skein_Swap64(SKEIN_CFG_TREE_INFO_SEQUENTIAL);
+
+ /* compute the initial chaining values from config block */
+ memset(ctx->X, 0, sizeof(ctx->X)); /* zero the chaining variables */
+ Skein_512_Process_Block(ctx, cfg.b, 1, sizeof(cfg));
+
+ /* The chaining vars ctx->X are now initialized for the given hashBitLen. */
+ /* Set up to process the data message portion of the hash (default) */
+ ctx->h.bCnt = 0; /* buffer b[] starts out empty */
+ Skein_Start_New_Type(ctx, MSG); /* T0=0, T1= MSG type */
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* process the input bytes */
+static int Skein_512_Update(struct skein512_ctx *ctx, const u8 * msg,
+ size_t msgByteCnt)
+{
+ size_t n;
+
+ Skein_Assert(ctx->h.bCnt <= SKEIN_512_BLOCK_BYTES, SKEIN_FAIL); /* catch uninitialized context */
+
+ /* process full blocks, if any */
+ if (msgByteCnt + ctx->h.bCnt > SKEIN_512_BLOCK_BYTES) {
+ if (ctx->h.bCnt) { /* finish up any buffered message data */
+ n = SKEIN_512_BLOCK_BYTES - ctx->h.bCnt; /* # bytes free in buffer b[] */
+ if (n) {
+ Skein_assert(n < msgByteCnt); /* check on our logic here */
+ memcpy(&ctx->b[ctx->h.bCnt], msg, n);
+ msgByteCnt -= n;
+ msg += n;
+ ctx->h.bCnt += n;
+ }
+ Skein_assert(ctx->h.bCnt == SKEIN_512_BLOCK_BYTES);
+ Skein_512_Process_Block(ctx, ctx->b, 1,
+ SKEIN_512_BLOCK_BYTES);
+ ctx->h.bCnt = 0;
+ }
+ /* now process any remaining full blocks, directly from input message data */
+ if (msgByteCnt > SKEIN_512_BLOCK_BYTES) {
+ n = (msgByteCnt - 1) / SKEIN_512_BLOCK_BYTES; /* number of full blocks to process */
+ Skein_512_Process_Block(ctx, msg, n,
+ SKEIN_512_BLOCK_BYTES);
+ msgByteCnt -= n * SKEIN_512_BLOCK_BYTES;
+ msg += n * SKEIN_512_BLOCK_BYTES;
+ }
+ Skein_assert(ctx->h.bCnt == 0);
+ }
+
+ /* copy any remaining source message data bytes into b[] */
+ if (msgByteCnt) {
+ Skein_assert(msgByteCnt + ctx->h.bCnt <= SKEIN_512_BLOCK_BYTES);
+ memcpy(&ctx->b[ctx->h.bCnt], msg, msgByteCnt);
+ ctx->h.bCnt += msgByteCnt;
+ }
+
+ return SKEIN_SUCCESS;
+}
+
+/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
+/* finalize the hash computation and output the result */
+static int Skein_512_Final(struct skein512_ctx *ctx, u8 * hashVal)
+{
+ size_t i, n, byteCnt;
+ u64 X[SKEIN_512_STATE_WORDS];
+ Skein_Assert(ctx->h.bCnt <= SKEIN_512_BLOCK_BYTES, SKEIN_FAIL); /* catch uninitialized context */
+
+ ctx->h.T[1] |= SKEIN_T1_FLAG_FINAL; /* tag as the final block */
+ if (ctx->h.bCnt < SKEIN_512_BLOCK_BYTES) /* zero pad b[] if necessary */
+ memset(&ctx->b[ctx->h.bCnt], 0,
+ SKEIN_512_BLOCK_BYTES - ctx->h.bCnt);
+
+ Skein_512_Process_Block(ctx, ctx->b, 1, ctx->h.bCnt); /* process the final block */
+
+ /* now output the result */
+ byteCnt = (ctx->h.hashBitLen + 7) >> 3; /* total number of output bytes */
+
+ /* run Threefish in "counter mode" to generate more output */
+ memset(ctx->b, 0, sizeof(ctx->b)); /* zero out b[], so it can hold the counter */
+ memcpy(X, ctx->X, sizeof(X)); /* keep a local copy of counter mode "key" */
+ for (i = 0; i * SKEIN_512_BLOCK_BYTES < byteCnt; i++) {
+ ((u64 *) ctx->b)[0] = Skein_Swap64((u64) i); /* build the counter block */
+ Skein_Start_New_Type(ctx, OUT_FINAL);
+ Skein_512_Process_Block(ctx, ctx->b, 1, sizeof(u64)); /* run "counter mode" */
+ n = byteCnt - i * SKEIN_512_BLOCK_BYTES; /* number of output bytes left to go */
+ if (n >= SKEIN_512_BLOCK_BYTES)
+ n = SKEIN_512_BLOCK_BYTES;
+ Skein_Put64_LSB_First(hashVal + i * SKEIN_512_BLOCK_BYTES, ctx->X, n); /* "output" the ctr mode bytes */
+ Skein_Show_Final(512, &ctx->h, n,
+ hashVal + i * SKEIN_512_BLOCK_BYTES);
+ memcpy(ctx->X, X, sizeof(X)); /* restore the counter mode key for next time */
+ }
+
+ return SKEIN_SUCCESS;
+}
+
+static void skein512_init(struct crypto_tfm *tfm)
+{
+ struct skein512_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ Skein_512_Init(sctx, SKEIN512_DIGEST_BITS);
+}
+
+static void skein512_update(struct crypto_tfm *tfm, const u8 * data,
+ unsigned int len)
+{
+ struct skein512_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ Skein_512_Update(sctx, data, len);
+}
+
+static void skein512_final(struct crypto_tfm *tfm, u8 * out)
+{
+ struct skein512_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ Skein_512_Final(sctx, out);
+}
+
+static struct crypto_alg skein512 = {
+ .cra_name = "skein512",
+ .cra_driver_name = "skein512-generic",
+ .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
+ .cra_blocksize = SKEIN512_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct skein512_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_alignmask = 3,
+ .cra_list = LIST_HEAD_INIT(skein512.cra_list),
+ .cra_u = {.digest = {
+ .dia_digestsize = SKEIN512_DIGEST_SIZE,
+ .dia_init = skein512_init,
+ .dia_update = skein512_update,
+ .dia_final = skein512_final}}
+};
+
+static int __init skein512_generic_mod_init(void)
+{
+ return crypto_register_alg(&skein512);
+}
+
+static void __exit skein512_generic_mod_fini(void)
+{
+ crypto_unregister_alg(&skein512);
+}
+
+module_init(skein512_generic_mod_init);
+module_exit(skein512_generic_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Skein-512 Secure Hash Algorithm");
+
+MODULE_ALIAS("skein512");
--
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