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Diffstat (limited to 'lib/ext2fs/sha256.c')
| -rw-r--r-- | lib/ext2fs/sha256.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/lib/ext2fs/sha256.c b/lib/ext2fs/sha256.c new file mode 100644 index 0000000..b1506e2 --- /dev/null +++ b/lib/ext2fs/sha256.c @@ -0,0 +1,254 @@ +/* + * sha256.c --- The sh256 algorithm + * + * Copyright (C) 2004 Sam Hocevar <sam@hocevar.net> + * (copied from libtomcrypt and then relicensed under GPLv2) + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Library + * General Public License, version 2. + * %End-Header% + */ + + +#include "config.h" +#if HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#include "ext2fs.h" + +static const __u32 K[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 +}; + +/* Various logical functions */ +#define Ch(x,y,z) (z ^ (x & (y ^ z))) +#define Maj(x,y,z) (((x | y) & z) | (x & y)) +#define S(x, n) RORc((x),(n)) +#define R(x, n) (((x)&0xFFFFFFFFUL)>>(n)) +#define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22)) +#define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25)) +#define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3)) +#define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10)) +#define RORc(x, y) ( ((((__u32)(x)&0xFFFFFFFFUL)>>(__u32)((y)&31)) | ((__u32)(x)<<(__u32)(32-((y)&31)))) & 0xFFFFFFFFUL) + +#define RND(a,b,c,d,e,f,g,h,i) \ + t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \ + t1 = Sigma0(a) + Maj(a, b, c); \ + d += t0; \ + h = t0 + t1; + +#define STORE64H(x, y) \ + do { \ + (y)[0] = (unsigned char)(((x)>>56)&255);\ + (y)[1] = (unsigned char)(((x)>>48)&255);\ + (y)[2] = (unsigned char)(((x)>>40)&255);\ + (y)[3] = (unsigned char)(((x)>>32)&255);\ + (y)[4] = (unsigned char)(((x)>>24)&255);\ + (y)[5] = (unsigned char)(((x)>>16)&255);\ + (y)[6] = (unsigned char)(((x)>>8)&255);\ + (y)[7] = (unsigned char)((x)&255); } while(0) + +#define STORE32H(x, y) \ + do { (y)[0] = (unsigned char)(((x)>>24)&255); (y)[1] = (unsigned char)(((x)>>16)&255); \ + (y)[2] = (unsigned char)(((x)>>8)&255); (y)[3] = (unsigned char)((x)&255); } while(0) + +#define LOAD32H(x, y) \ + do { x = ((__u32)((y)[0] & 255)<<24) | \ + ((__u32)((y)[1] & 255)<<16) | \ + ((__u32)((y)[2] & 255)<<8) | \ + ((__u32)((y)[3] & 255)); } while(0) + +struct sha256_state { + __u64 length; + __u32 state[8], curlen; + unsigned char buf[64]; +}; + +/* This is a highly simplified version from libtomcrypt */ +struct hash_state { + struct sha256_state sha256; +}; + +static void sha256_compress(struct hash_state * md, const unsigned char *buf) +{ + __u32 S[8], W[64], t0, t1; + __u32 t; + int i; + + /* copy state into S */ + for (i = 0; i < 8; i++) { + S[i] = md->sha256.state[i]; + } + + /* copy the state into 512-bits into W[0..15] */ + for (i = 0; i < 16; i++) { + LOAD32H(W[i], buf + (4*i)); + } + + /* fill W[16..63] */ + for (i = 16; i < 64; i++) { + W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16]; + } + + /* Compress */ + for (i = 0; i < 64; ++i) { + RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i); + t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4]; + S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t; + } + + /* feedback */ + for (i = 0; i < 8; i++) { + md->sha256.state[i] = md->sha256.state[i] + S[i]; + } +} + +static void sha256_init(struct hash_state * md) +{ + md->sha256.curlen = 0; + md->sha256.length = 0; + md->sha256.state[0] = 0x6A09E667UL; + md->sha256.state[1] = 0xBB67AE85UL; + md->sha256.state[2] = 0x3C6EF372UL; + md->sha256.state[3] = 0xA54FF53AUL; + md->sha256.state[4] = 0x510E527FUL; + md->sha256.state[5] = 0x9B05688CUL; + md->sha256.state[6] = 0x1F83D9ABUL; + md->sha256.state[7] = 0x5BE0CD19UL; +} + +#define MIN(x, y) ( ((x)<(y))?(x):(y) ) +#define SHA256_BLOCKSIZE 64 +static void sha256_process(struct hash_state * md, const unsigned char *in, unsigned long inlen) +{ + unsigned long n; + + while (inlen > 0) { + if (md->sha256.curlen == 0 && inlen >= SHA256_BLOCKSIZE) { + sha256_compress(md, in); + md->sha256.length += SHA256_BLOCKSIZE * 8; + in += SHA256_BLOCKSIZE; + inlen -= SHA256_BLOCKSIZE; + } else { + n = MIN(inlen, (SHA256_BLOCKSIZE - md->sha256.curlen)); + memcpy(md->sha256.buf + md->sha256.curlen, in, (size_t)n); + md->sha256.curlen += n; + in += n; + inlen -= n; + if (md->sha256.curlen == SHA256_BLOCKSIZE) { + sha256_compress(md, md->sha256.buf); + md->sha256.length += 8*SHA256_BLOCKSIZE; + md->sha256.curlen = 0; + } + } + } +} + + +static void sha256_done(struct hash_state * md, unsigned char *out) +{ + int i; + + /* increase the length of the message */ + md->sha256.length += md->sha256.curlen * 8; + + /* append the '1' bit */ + md->sha256.buf[md->sha256.curlen++] = (unsigned char)0x80; + + /* if the length is currently above 56 bytes we append zeros + * then compress. Then we can fall back to padding zeros and length + * encoding like normal. + */ + if (md->sha256.curlen > 56) { + while (md->sha256.curlen < 64) { + md->sha256.buf[md->sha256.curlen++] = (unsigned char)0; + } + sha256_compress(md, md->sha256.buf); + md->sha256.curlen = 0; + } + + /* pad up to 56 bytes of zeroes */ + while (md->sha256.curlen < 56) { + md->sha256.buf[md->sha256.curlen++] = (unsigned char)0; + } + + /* store length */ + STORE64H(md->sha256.length, md->sha256.buf+56); + sha256_compress(md, md->sha256.buf); + + /* copy output */ + for (i = 0; i < 8; i++) { + STORE32H(md->sha256.state[i], out+(4*i)); + } +} + +void ext2fs_sha256(const unsigned char *in, unsigned long in_size, + unsigned char out[EXT2FS_SHA256_LENGTH]) +{ + struct hash_state md; + + sha256_init(&md); + sha256_process(&md, in, in_size); + sha256_done(&md, out); +} + +#ifdef UNITTEST +static const struct { + char *msg; + unsigned char hash[32]; +} tests[] = { + { "", + { 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, + 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, + 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, + 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55 } + }, + { "abc", + { 0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea, + 0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23, + 0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c, + 0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad } + }, + { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", + { 0x24, 0x8d, 0x6a, 0x61, 0xd2, 0x06, 0x38, 0xb8, + 0xe5, 0xc0, 0x26, 0x93, 0x0c, 0x3e, 0x60, 0x39, + 0xa3, 0x3c, 0xe4, 0x59, 0x64, 0xff, 0x21, 0x67, + 0xf6, 0xec, 0xed, 0xd4, 0x19, 0xdb, 0x06, 0xc1 } + }, +}; + +int main(int argc, char **argv) +{ + int i; + int errors = 0; + unsigned char tmp[32]; + + for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) { + unsigned char *msg = (unsigned char *) tests[i].msg; + int len = strlen(tests[i].msg); + + ext2fs_sha256(msg, len, tmp); + printf("SHA256 test message %d: ", i); + if (memcmp(tmp, tests[i].hash, 32) != 0) { + printf("FAILED\n"); + errors++; + } else + printf("OK\n"); + } + return errors; +} + +#endif /* UNITTEST */ |