610 lines
19 KiB
C
610 lines
19 KiB
C
/*
|
|
* FILE: sha2.c
|
|
* AUTHOR: Aaron D. Gifford <me@aarongifford.com>
|
|
*
|
|
* Copyright (c) 2000-2001, Aaron D. Gifford
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the copyright holder nor the names of contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <string.h> /* memcpy()/memset() or bcopy()/bzero() */
|
|
#include <assert.h> /* assert() */
|
|
#include "sha2.h"
|
|
|
|
/*
|
|
* ASSERT NOTE:
|
|
* Some sanity checking code is included using assert(). On my FreeBSD
|
|
* system, this additional code can be removed by compiling with NDEBUG
|
|
* defined. Check your own systems manpage on assert() to see how to
|
|
* compile WITHOUT the sanity checking code on your system.
|
|
*
|
|
* UNROLLED TRANSFORM LOOP NOTE:
|
|
* You can define SHA2_UNROLL_TRANSFORM to use the unrolled transform
|
|
* loop version for the hash transform rounds (defined using macros
|
|
* later in this file). Either define on the command line, for example:
|
|
*
|
|
* cc -DSHA2_UNROLL_TRANSFORM -o sha2 sha2.c sha2prog.c
|
|
*
|
|
* or define below:
|
|
*
|
|
* #define SHA2_UNROLL_TRANSFORM
|
|
*
|
|
*/
|
|
|
|
|
|
/*** SHA-256/384/512 Machine Architecture Definitions *****************/
|
|
/*
|
|
* BYTE_ORDER NOTE:
|
|
*
|
|
* Please make sure that your system defines BYTE_ORDER. If your
|
|
* architecture is little-endian, make sure it also defines
|
|
* LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
|
|
* equivilent.
|
|
*
|
|
* If your system does not define the above, then you can do so by
|
|
* hand like this:
|
|
*
|
|
* #define LITTLE_ENDIAN 1234
|
|
* #define BIG_ENDIAN 4321
|
|
*
|
|
* And for little-endian machines, add:
|
|
*
|
|
* #define BYTE_ORDER LITTLE_ENDIAN
|
|
*
|
|
* Or for big-endian machines:
|
|
*
|
|
* #define BYTE_ORDER BIG_ENDIAN
|
|
*
|
|
* The FreeBSD machine this was written on defines BYTE_ORDER
|
|
* appropriately by including <sys/types.h> (which in turn includes
|
|
* <machine/endian.h> where the appropriate definitions are actually
|
|
* made).
|
|
*/
|
|
#if !defined(BYTE_ORDER) || (BYTE_ORDER != LITTLE_ENDIAN && BYTE_ORDER != BIG_ENDIAN)
|
|
#error Define BYTE_ORDER to be equal to either LITTLE_ENDIAN or BIG_ENDIAN
|
|
#endif
|
|
|
|
/*
|
|
* Define the followingsha2_* types to types of the correct length on
|
|
* the native archtecture. Most BSD systems and Linux define u_intXX_t
|
|
* types. Machines with very recent ANSI C headers, can use the
|
|
* uintXX_t definintions from inttypes.h by defining SHA2_USE_INTTYPES_H
|
|
* during compile or in the sha.h header file.
|
|
*
|
|
* Machines that support neither u_intXX_t nor inttypes.h's uintXX_t
|
|
* will need to define these three typedefs below (and the appropriate
|
|
* ones in sha.h too) by hand according to their system architecture.
|
|
*
|
|
* Thank you, Jun-ichiro itojun Hagino, for suggesting using u_intXX_t
|
|
* types and pointing out recent ANSI C support for uintXX_t in inttypes.h.
|
|
*/
|
|
#ifdef SHA2_USE_INTTYPES_H
|
|
|
|
typedef uint8_t sha2_byte; /* Exactly 1 byte */
|
|
typedef uint32_t sha2_word32; /* Exactly 4 bytes */
|
|
typedef uint64_t sha2_word64; /* Exactly 8 bytes */
|
|
|
|
#else /* SHA2_USE_INTTYPES_H */
|
|
|
|
typedef u_int8_t sha2_byte; /* Exactly 1 byte */
|
|
typedef u_int32_t sha2_word32; /* Exactly 4 bytes */
|
|
typedef u_int64_t sha2_word64; /* Exactly 8 bytes */
|
|
|
|
#endif /* SHA2_USE_INTTYPES_H */
|
|
|
|
|
|
/*** SHA-256/384/512 Various Length Definitions ***********************/
|
|
/* NOTE: Most of these are in sha2.h */
|
|
#define SHA256_SHORT_BLOCK_LENGTH (SHA256_BLOCK_LENGTH - 8)
|
|
#define SHA384_SHORT_BLOCK_LENGTH (SHA384_BLOCK_LENGTH - 16)
|
|
#define SHA512_SHORT_BLOCK_LENGTH (SHA512_BLOCK_LENGTH - 16)
|
|
|
|
|
|
/*** ENDIAN REVERSAL MACROS *******************************************/
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
#define REVERSE32(w,x) { \
|
|
sha2_word32 tmp = (w); \
|
|
tmp = (tmp >> 16) | (tmp << 16); \
|
|
(x) = ((tmp & 0xff00ff00UL) >> 8) | ((tmp & 0x00ff00ffUL) << 8); \
|
|
}
|
|
|
|
#ifdef WIN32
|
|
|
|
#define REVERSE64(w,x) { \
|
|
sha2_word64 tmp = (w); \
|
|
tmp = (tmp >> 32) | (tmp << 32); \
|
|
tmp = ((tmp & 0xff00ff00ff00ff00Ui64) >> 8) | \
|
|
((tmp & 0x00ff00ff00ff00ffUi64) << 8); \
|
|
(x) = ((tmp & 0xffff0000ffff0000Ui64) >> 16) | \
|
|
((tmp & 0x0000ffff0000ffffUi64) << 16); \
|
|
}
|
|
|
|
#else
|
|
|
|
#define REVERSE64(w,x) { \
|
|
sha2_word64 tmp = (w); \
|
|
tmp = (tmp >> 32) | (tmp << 32); \
|
|
tmp = ((tmp & 0xff00ff00ff00ff00ULL) >> 8) | \
|
|
((tmp & 0x00ff00ff00ff00ffULL) << 8); \
|
|
(x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | \
|
|
((tmp & 0x0000ffff0000ffffULL) << 16); \
|
|
}
|
|
|
|
#endif /* WIN32 */
|
|
|
|
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
|
|
|
|
/*
|
|
* Macro for incrementally adding the unsigned 64-bit integer n to the
|
|
* unsigned 128-bit integer (represented using a two-element array of
|
|
* 64-bit words):
|
|
*/
|
|
#define ADDINC128(w,n) { \
|
|
(w)[0] += (sha2_word64)(n); \
|
|
if ((w)[0] < (n)) { \
|
|
(w)[1]++; \
|
|
} \
|
|
}
|
|
|
|
/*
|
|
* Macros for copying blocks of memory and for zeroing out ranges
|
|
* of memory. Using these macros makes it easy to switch from
|
|
* using memset()/memcpy() and using bzero()/bcopy().
|
|
*
|
|
* Please define either SHA2_USE_MEMSET_MEMCPY or define
|
|
* SHA2_USE_BZERO_BCOPY depending on which function set you
|
|
* choose to use:
|
|
*/
|
|
#if !defined(SHA2_USE_MEMSET_MEMCPY) && !defined(SHA2_USE_BZERO_BCOPY)
|
|
/* Default to memset()/memcpy() if no option is specified */
|
|
#define SHA2_USE_MEMSET_MEMCPY 1
|
|
#endif
|
|
#if defined(SHA2_USE_MEMSET_MEMCPY) && defined(SHA2_USE_BZERO_BCOPY)
|
|
/* Abort with an error if BOTH options are defined */
|
|
#error Define either SHA2_USE_MEMSET_MEMCPY or SHA2_USE_BZERO_BCOPY, not both!
|
|
#endif
|
|
|
|
#ifdef SHA2_USE_MEMSET_MEMCPY
|
|
#define MEMSET_BZERO(p,l) memset((p), 0, (l))
|
|
#define MEMCPY_BCOPY(d,s,l) memcpy((d), (s), (l))
|
|
#endif
|
|
#ifdef SHA2_USE_BZERO_BCOPY
|
|
#define MEMSET_BZERO(p,l) bzero((p), (l))
|
|
#define MEMCPY_BCOPY(d,s,l) bcopy((s), (d), (l))
|
|
#endif
|
|
|
|
|
|
/*** THE SIX LOGICAL FUNCTIONS ****************************************/
|
|
/*
|
|
* Bit shifting and rotation (used by the six SHA-XYZ logical functions:
|
|
*
|
|
* NOTE: The naming of R and S appears backwards here (R is a SHIFT and
|
|
* S is a ROTATION) because the SHA-256/384/512 description document
|
|
* (see http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf) uses this
|
|
* same "backwards" definition.
|
|
*/
|
|
/* Shift-right (used in SHA-256, SHA-384, and SHA-512): */
|
|
#define R(b,x) ((x) >> (b))
|
|
/* 32-bit Rotate-right (used in SHA-256): */
|
|
#define S32(b,x) (((x) >> (b)) | ((x) << (32 - (b))))
|
|
/* 64-bit Rotate-right (used in SHA-384 and SHA-512): */
|
|
#define S64(b,x) (((x) >> (b)) | ((x) << (64 - (b))))
|
|
|
|
/* Two of six logical functions used in SHA-256, SHA-384, and SHA-512: */
|
|
#define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
|
|
#define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
|
|
|
|
/* Four of six logical functions used in SHA-256: */
|
|
#define Sigma0_256(x) (S32(2, (x)) ^ S32(13, (x)) ^ S32(22, (x)))
|
|
#define Sigma1_256(x) (S32(6, (x)) ^ S32(11, (x)) ^ S32(25, (x)))
|
|
#define sigma0_256(x) (S32(7, (x)) ^ S32(18, (x)) ^ R(3 , (x)))
|
|
#define sigma1_256(x) (S32(17, (x)) ^ S32(19, (x)) ^ R(10, (x)))
|
|
|
|
/* Four of six logical functions used in SHA-384 and SHA-512: */
|
|
#define Sigma0_512(x) (S64(28, (x)) ^ S64(34, (x)) ^ S64(39, (x)))
|
|
#define Sigma1_512(x) (S64(14, (x)) ^ S64(18, (x)) ^ S64(41, (x)))
|
|
#define sigma0_512(x) (S64( 1, (x)) ^ S64( 8, (x)) ^ R( 7, (x)))
|
|
#define sigma1_512(x) (S64(19, (x)) ^ S64(61, (x)) ^ R( 6, (x)))
|
|
|
|
/*** INTERNAL FUNCTION PROTOTYPES *************************************/
|
|
/* NOTE: These should not be accessed directly from outside this
|
|
* library -- they are intended for private internal visibility/use
|
|
* only.
|
|
*/
|
|
void SHA512_Last(SHA512_CTX*);
|
|
void SHA256_Transform(SHA256_CTX*, const sha2_word32*);
|
|
void SHA512_Transform(SHA512_CTX*, const sha2_word64*);
|
|
|
|
|
|
/*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
|
|
/* Hash constant words K for SHA-256: */
|
|
const static sha2_word32 K256[64] = {
|
|
0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
|
|
0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
|
|
0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
|
|
0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
|
|
0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
|
|
0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
|
|
0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
|
|
0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
|
|
0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
|
|
0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
|
|
0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
|
|
0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
|
|
0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
|
|
0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
|
|
0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
|
|
0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
|
|
};
|
|
|
|
/* Initial hash value H for SHA-256: */
|
|
const static sha2_word32 sha256_initial_hash_value[8] = {
|
|
0x6a09e667UL,
|
|
0xbb67ae85UL,
|
|
0x3c6ef372UL,
|
|
0xa54ff53aUL,
|
|
0x510e527fUL,
|
|
0x9b05688cUL,
|
|
0x1f83d9abUL,
|
|
0x5be0cd19UL
|
|
};
|
|
|
|
/*
|
|
* Constant used by SHA256/384/512_End() functions for converting the
|
|
* digest to a readable hexadecimal character string:
|
|
*/
|
|
static const char *sha2_hex_digits = "0123456789abcdef";
|
|
|
|
|
|
/*** SHA-256: *********************************************************/
|
|
void SHA256_Init(SHA256_CTX* context) {
|
|
if (context == (SHA256_CTX*)0) {
|
|
return;
|
|
}
|
|
MEMCPY_BCOPY(context->state, sha256_initial_hash_value, SHA256_DIGEST_LENGTH);
|
|
MEMSET_BZERO(context->buffer, SHA256_BLOCK_LENGTH);
|
|
context->bitcount = 0;
|
|
}
|
|
|
|
#ifdef SHA2_UNROLL_TRANSFORM
|
|
|
|
/* Unrolled SHA-256 round macros: */
|
|
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
|
|
#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) \
|
|
REVERSE32(*data++, W256[j]); \
|
|
T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
|
|
K256[j] + W256[j]; \
|
|
(d) += T1; \
|
|
(h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
|
|
j++
|
|
|
|
|
|
#else /* BYTE_ORDER == LITTLE_ENDIAN */
|
|
|
|
#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) \
|
|
T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + \
|
|
K256[j] + (W256[j] = *data++); \
|
|
(d) += T1; \
|
|
(h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
|
|
j++
|
|
|
|
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
|
|
|
|
#define ROUND256(a,b,c,d,e,f,g,h) \
|
|
s0 = W256[(j+1)&0x0f]; \
|
|
s0 = sigma0_256(s0); \
|
|
s1 = W256[(j+14)&0x0f]; \
|
|
s1 = sigma1_256(s1); \
|
|
T1 = (h) + Sigma1_256(e) + Ch((e), (f), (g)) + K256[j] + \
|
|
(W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0); \
|
|
(d) += T1; \
|
|
(h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
|
|
j++
|
|
|
|
void SHA256_Transform(SHA256_CTX* context, const sha2_word32* data) {
|
|
sha2_word32 a, b, c, d, e, f, g, h, s0, s1;
|
|
sha2_word32 T1, *W256;
|
|
int j;
|
|
|
|
W256 = (sha2_word32*)context->buffer;
|
|
|
|
/* Initialize registers with the prev. intermediate value */
|
|
a = context->state[0];
|
|
b = context->state[1];
|
|
c = context->state[2];
|
|
d = context->state[3];
|
|
e = context->state[4];
|
|
f = context->state[5];
|
|
g = context->state[6];
|
|
h = context->state[7];
|
|
|
|
j = 0;
|
|
do {
|
|
/* Rounds 0 to 15 (unrolled): */
|
|
ROUND256_0_TO_15(a,b,c,d,e,f,g,h);
|
|
ROUND256_0_TO_15(h,a,b,c,d,e,f,g);
|
|
ROUND256_0_TO_15(g,h,a,b,c,d,e,f);
|
|
ROUND256_0_TO_15(f,g,h,a,b,c,d,e);
|
|
ROUND256_0_TO_15(e,f,g,h,a,b,c,d);
|
|
ROUND256_0_TO_15(d,e,f,g,h,a,b,c);
|
|
ROUND256_0_TO_15(c,d,e,f,g,h,a,b);
|
|
ROUND256_0_TO_15(b,c,d,e,f,g,h,a);
|
|
} while (j < 16);
|
|
|
|
/* Now for the remaining rounds to 64: */
|
|
do {
|
|
ROUND256(a,b,c,d,e,f,g,h);
|
|
ROUND256(h,a,b,c,d,e,f,g);
|
|
ROUND256(g,h,a,b,c,d,e,f);
|
|
ROUND256(f,g,h,a,b,c,d,e);
|
|
ROUND256(e,f,g,h,a,b,c,d);
|
|
ROUND256(d,e,f,g,h,a,b,c);
|
|
ROUND256(c,d,e,f,g,h,a,b);
|
|
ROUND256(b,c,d,e,f,g,h,a);
|
|
} while (j < 64);
|
|
|
|
/* Compute the current intermediate hash value */
|
|
context->state[0] += a;
|
|
context->state[1] += b;
|
|
context->state[2] += c;
|
|
context->state[3] += d;
|
|
context->state[4] += e;
|
|
context->state[5] += f;
|
|
context->state[6] += g;
|
|
context->state[7] += h;
|
|
|
|
/* Clean up */
|
|
a = b = c = d = e = f = g = h = T1 = 0;
|
|
}
|
|
|
|
#else /* SHA2_UNROLL_TRANSFORM */
|
|
|
|
void SHA256_Transform(SHA256_CTX* context, const sha2_word32* data) {
|
|
sha2_word32 a, b, c, d, e, f, g, h;
|
|
sha2_word32 T1, T2, *W256;
|
|
int j;
|
|
|
|
W256 = (sha2_word32*)context->buffer;
|
|
|
|
/* Initialize registers with the prev. intermediate value */
|
|
a = context->state[0];
|
|
b = context->state[1];
|
|
c = context->state[2];
|
|
d = context->state[3];
|
|
e = context->state[4];
|
|
f = context->state[5];
|
|
g = context->state[6];
|
|
h = context->state[7];
|
|
|
|
j = 0;
|
|
do {
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
/* Copy data while converting to host byte order */
|
|
REVERSE32(*data++,W256[j]);
|
|
/* Apply the SHA-256 compression function to update a..h */
|
|
T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + W256[j];
|
|
#else /* BYTE_ORDER == LITTLE_ENDIAN */
|
|
/* Apply the SHA-256 compression function to update a..h with copy */
|
|
T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + (W256[j] = *data++);
|
|
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
|
|
T2 = Sigma0_256(a) + Maj(a, b, c);
|
|
h = g;
|
|
g = f;
|
|
f = e;
|
|
e = d + T1;
|
|
d = c;
|
|
c = b;
|
|
b = a;
|
|
a = T1 + T2;
|
|
|
|
j++;
|
|
} while (j < 16);
|
|
|
|
do {
|
|
sha2_word32 s0, s1;
|
|
/* Part of the message block expansion: */
|
|
s0 = W256[(j+1)&0x0f];
|
|
s0 = sigma0_256(s0);
|
|
s1 = W256[(j+14)&0x0f];
|
|
s1 = sigma1_256(s1);
|
|
|
|
/* Apply the SHA-256 compression function to update a..h */
|
|
T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] +
|
|
(W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0);
|
|
T2 = Sigma0_256(a) + Maj(a, b, c);
|
|
h = g;
|
|
g = f;
|
|
f = e;
|
|
e = d + T1;
|
|
d = c;
|
|
c = b;
|
|
b = a;
|
|
a = T1 + T2;
|
|
|
|
j++;
|
|
} while (j < 64);
|
|
|
|
/* Compute the current intermediate hash value */
|
|
context->state[0] += a;
|
|
context->state[1] += b;
|
|
context->state[2] += c;
|
|
context->state[3] += d;
|
|
context->state[4] += e;
|
|
context->state[5] += f;
|
|
context->state[6] += g;
|
|
context->state[7] += h;
|
|
|
|
/* Clean up */
|
|
a = b = c = d = e = f = g = h = T1 = T2 = 0;
|
|
}
|
|
|
|
#endif /* SHA2_UNROLL_TRANSFORM */
|
|
|
|
void SHA256_Update(SHA256_CTX* context, const sha2_byte *data, size_t len) {
|
|
unsigned int freespace, usedspace;
|
|
|
|
if (len == 0) {
|
|
/* Calling with no data is valid - we do nothing */
|
|
return;
|
|
}
|
|
|
|
/* Sanity check: */
|
|
assert(context != (SHA256_CTX*)0 && data != (sha2_byte*)0);
|
|
|
|
usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
|
|
if (usedspace > 0) {
|
|
/* Calculate how much free space is available in the buffer */
|
|
freespace = SHA256_BLOCK_LENGTH - usedspace;
|
|
|
|
if (len >= freespace) {
|
|
/* Fill the buffer completely and process it */
|
|
MEMCPY_BCOPY(&context->buffer[usedspace], data, freespace);
|
|
context->bitcount += freespace << 3;
|
|
len -= freespace;
|
|
data += freespace;
|
|
SHA256_Transform(context, (sha2_word32*)context->buffer);
|
|
} else {
|
|
/* The buffer is not yet full */
|
|
MEMCPY_BCOPY(&context->buffer[usedspace], data, len);
|
|
context->bitcount += len << 3;
|
|
/* Clean up: */
|
|
usedspace = freespace = 0;
|
|
return;
|
|
}
|
|
}
|
|
while (len >= SHA256_BLOCK_LENGTH) {
|
|
/* Process as many complete blocks as we can */
|
|
SHA256_Transform(context, (sha2_word32*)data);
|
|
context->bitcount += SHA256_BLOCK_LENGTH << 3;
|
|
len -= SHA256_BLOCK_LENGTH;
|
|
data += SHA256_BLOCK_LENGTH;
|
|
}
|
|
if (len > 0) {
|
|
/* There's left-overs, so save 'em */
|
|
MEMCPY_BCOPY(context->buffer, data, len);
|
|
context->bitcount += len << 3;
|
|
}
|
|
/* Clean up: */
|
|
usedspace = freespace = 0;
|
|
}
|
|
|
|
void SHA256_Final(sha2_byte digest[], SHA256_CTX* context) {
|
|
sha2_word32 *d = (sha2_word32*)digest;
|
|
unsigned int usedspace;
|
|
|
|
/* Sanity check: */
|
|
assert(context != (SHA256_CTX*)0);
|
|
|
|
/* If no digest buffer is passed, we don't bother doing this: */
|
|
if (digest != (sha2_byte*)0) {
|
|
usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
/* Convert FROM host byte order */
|
|
REVERSE64(context->bitcount,context->bitcount);
|
|
#endif
|
|
if (usedspace > 0) {
|
|
/* Begin padding with a 1 bit: */
|
|
context->buffer[usedspace++] = 0x80;
|
|
|
|
if (usedspace <= SHA256_SHORT_BLOCK_LENGTH) {
|
|
/* Set-up for the last transform: */
|
|
MEMSET_BZERO(&context->buffer[usedspace], SHA256_SHORT_BLOCK_LENGTH - usedspace);
|
|
} else {
|
|
if (usedspace < SHA256_BLOCK_LENGTH) {
|
|
MEMSET_BZERO(&context->buffer[usedspace], SHA256_BLOCK_LENGTH - usedspace);
|
|
}
|
|
/* Do second-to-last transform: */
|
|
SHA256_Transform(context, (sha2_word32*)context->buffer);
|
|
|
|
/* And set-up for the last transform: */
|
|
MEMSET_BZERO(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
|
|
}
|
|
} else {
|
|
/* Set-up for the last transform: */
|
|
MEMSET_BZERO(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
|
|
|
|
/* Begin padding with a 1 bit: */
|
|
*context->buffer = 0x80;
|
|
}
|
|
/* Set the bit count: */
|
|
*(sha2_word64*)&context->buffer[SHA256_SHORT_BLOCK_LENGTH] = context->bitcount;
|
|
|
|
/* Final transform: */
|
|
SHA256_Transform(context, (sha2_word32*)context->buffer);
|
|
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
{
|
|
/* Convert TO host byte order */
|
|
int j;
|
|
for (j = 0; j < 8; j++) {
|
|
REVERSE32(context->state[j],context->state[j]);
|
|
*d++ = context->state[j];
|
|
}
|
|
}
|
|
#else
|
|
MEMCPY_BCOPY(d, context->state, SHA256_DIGEST_LENGTH);
|
|
#endif
|
|
}
|
|
|
|
/* Clean up state data: */
|
|
MEMSET_BZERO(context, sizeof(context));
|
|
usedspace = 0;
|
|
}
|
|
|
|
char *SHA256_End(SHA256_CTX* context, char buffer[]) {
|
|
sha2_byte digest[SHA256_DIGEST_LENGTH], *d = digest;
|
|
|
|
/* Sanity check: */
|
|
assert(context != (SHA256_CTX*)0);
|
|
|
|
if (buffer != (char*)0) {
|
|
int i = 0;
|
|
SHA256_Final(digest, context);
|
|
for (; i < SHA256_DIGEST_LENGTH; i++) {
|
|
*buffer++ = sha2_hex_digits[(*d & 0xf0) >> 4];
|
|
*buffer++ = sha2_hex_digits[*d & 0x0f];
|
|
d++;
|
|
}
|
|
*buffer = (char)0;
|
|
} else {
|
|
MEMSET_BZERO(context, sizeof(context));
|
|
}
|
|
MEMSET_BZERO(digest, SHA256_DIGEST_LENGTH);
|
|
return buffer;
|
|
}
|
|
|
|
char* SHA256_Data(const sha2_byte* data, size_t len, char digest[SHA256_DIGEST_STRING_LENGTH]) {
|
|
SHA256_CTX context;
|
|
|
|
SHA256_Init(&context);
|
|
SHA256_Update(&context, data, len);
|
|
return SHA256_End(&context, digest);
|
|
}
|
|
|