1 /*
2  * An implementation of the SHA-256 hash function.
3  *
4  * The Federal Information Processing Standards (FIPS) Specification
5  * can be found here (FIPS 180-3):
6  *   http://csrc.nist.gov/publications/PubsFIPS.html
7  *
8  * Written in 2010 by Lorenz Quack <don@amberfisharts.com>
9  *
10  * ===================================================================
11  * The contents of this file are dedicated to the public domain.  To
12  * the extent that dedication to the public domain is not available,
13  * everyone is granted a worldwide, perpetual, royalty-free,
14  * non-exclusive license to exercise all rights associated with the
15  * contents of this file for any purpose whatsoever.
16  * No rights are reserved.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
22  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
23  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25  * SOFTWARE.
26  * ===================================================================
27  *
28  */
29 #define MODULE_NAME _SHA256
30 #define DIGEST_SIZE (256/8)
31 #define BLOCK_SIZE (512/8)
32 #define WORD_SIZE 4
33 #define SCHEDULE_SIZE 64
34 
35 #include "hash_SHA2.h"
36 
37 /* Initial Values H */
38 static const sha2_word_t H[8] = {
39     0x6a09e667,
40     0xbb67ae85,
41     0x3c6ef372,
42     0xa54ff53a,
43     0x510e527f,
44     0x9b05688c,
45     0x1f83d9ab,
46     0x5be0cd19
47 };
48 
49 /* the Constants K */
50 static const sha2_word_t K[SCHEDULE_SIZE] = {
51     0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
52     0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
53     0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
54     0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
55     0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
56     0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
57     0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
58     0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
59     0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
60     0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
61     0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
62     0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
63     0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
64 };
65 
66 /* SHA-256 specific functions */
67 #define Sigma0(x)    (ROTR(x,  2) ^ ROTR(x, 13) ^ ROTR(x, 22))
68 #define Sigma1(x)    (ROTR(x,  6) ^ ROTR(x, 11) ^ ROTR(x, 25))
69 #define Gamma0(x)    (ROTR(x,  7) ^ ROTR(x, 18) ^ SHR(x,  3))
70 #define Gamma1(x)    (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
71 
72 #include "hash_SHA2_template.c"
73 
74