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/*
* An implementation of the SHA-256 hash function.
*
* The Federal Information Processing Standards (FIPS) Specification
* can be found here (FIPS 180-3):
* http://csrc.nist.gov/publications/PubsFIPS.html
*
* Written in 2010 by Lorenz Quack <don@amberfisharts.com>
*
* ===================================================================
* The contents of this file are dedicated to the public domain. To
* the extent that dedication to the public domain is not available,
* everyone is granted a worldwide, perpetual, royalty-free,
* non-exclusive license to exercise all rights associated with the
* contents of this file for any purpose whatsoever.
* No rights are reserved.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* ===================================================================
*
*/
#include "pycrypto_common.h"
#define MODULE_NAME SHA256
#define DIGEST_SIZE (256/8)
#define BLOCK_SIZE (512/8)
#define WORD_SIZE 4
#define SCHEDULE_SIZE 64
static char MODULE__doc__[] =
"SHA-256 cryptographic hash algorithm.\n"
"\n"
"SHA-256 belongs to the SHA-2_ family of cryptographic hashes.\n"
"It produces the 256 bit digest of a message.\n"
"\n"
" >>> from Crypto.Hash import SHA256\n"
" >>>\n"
" >>> h = SHA256.new()\n"
" >>> h.update(b'Hello')\n"
" >>> print h.hexdigest()\n"
"\n"
"*SHA* stands for Secure Hash Algorithm.\n"
"\n"
".. _SHA-2: http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf\n"
"\n"
":Variables:\n"
" block_size\n"
" The internal block size of the hash algorithm in bytes.\n"
" digest_size\n"
" The size of the resulting hash in bytes.\n";
#include "hash_SHA2.h"
/* Initial Values H */
static const sha2_word_t H[8] = {
0x6a09e667,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19
};
/* the Constants K */
static const sha2_word_t K[SCHEDULE_SIZE] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
/* SHA-256 specific functions */
#define Sigma0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
#define Sigma1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
#define Gamma0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
#define Gamma1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
#include "hash_SHA2_template.c"
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