diff --git a/src/sha512.c b/src/sha512.c new file mode 100644 index 0000000..2da43d2 --- /dev/null +++ b/src/sha512.c @@ -0,0 +1,206 @@ +/* + * Code originally from LibTomCrypt -- Licensed under the Public Domain/WTFPL2.0 + */ + +#include "sha512.h" +#include "sha.h" + +/* the K array */ +static const uint64_t K[80] = { + CONST64(0x428a2f98d728ae22), CONST64(0x7137449123ef65cd), + CONST64(0xb5c0fbcfec4d3b2f), CONST64(0xe9b5dba58189dbbc), + CONST64(0x3956c25bf348b538), CONST64(0x59f111f1b605d019), + CONST64(0x923f82a4af194f9b), CONST64(0xab1c5ed5da6d8118), + CONST64(0xd807aa98a3030242), CONST64(0x12835b0145706fbe), + CONST64(0x243185be4ee4b28c), CONST64(0x550c7dc3d5ffb4e2), + CONST64(0x72be5d74f27b896f), CONST64(0x80deb1fe3b1696b1), + CONST64(0x9bdc06a725c71235), CONST64(0xc19bf174cf692694), + CONST64(0xe49b69c19ef14ad2), CONST64(0xefbe4786384f25e3), + CONST64(0x0fc19dc68b8cd5b5), CONST64(0x240ca1cc77ac9c65), + CONST64(0x2de92c6f592b0275), CONST64(0x4a7484aa6ea6e483), + CONST64(0x5cb0a9dcbd41fbd4), CONST64(0x76f988da831153b5), + CONST64(0x983e5152ee66dfab), CONST64(0xa831c66d2db43210), + CONST64(0xb00327c898fb213f), CONST64(0xbf597fc7beef0ee4), + CONST64(0xc6e00bf33da88fc2), CONST64(0xd5a79147930aa725), + CONST64(0x06ca6351e003826f), CONST64(0x142929670a0e6e70), + CONST64(0x27b70a8546d22ffc), CONST64(0x2e1b21385c26c926), + CONST64(0x4d2c6dfc5ac42aed), CONST64(0x53380d139d95b3df), + CONST64(0x650a73548baf63de), CONST64(0x766a0abb3c77b2a8), + CONST64(0x81c2c92e47edaee6), CONST64(0x92722c851482353b), + CONST64(0xa2bfe8a14cf10364), CONST64(0xa81a664bbc423001), + CONST64(0xc24b8b70d0f89791), CONST64(0xc76c51a30654be30), + CONST64(0xd192e819d6ef5218), CONST64(0xd69906245565a910), + CONST64(0xf40e35855771202a), CONST64(0x106aa07032bbd1b8), + CONST64(0x19a4c116b8d2d0c8), CONST64(0x1e376c085141ab53), + CONST64(0x2748774cdf8eeb99), CONST64(0x34b0bcb5e19b48a8), + CONST64(0x391c0cb3c5c95a63), CONST64(0x4ed8aa4ae3418acb), + CONST64(0x5b9cca4f7763e373), CONST64(0x682e6ff3d6b2b8a3), + CONST64(0x748f82ee5defb2fc), CONST64(0x78a5636f43172f60), + CONST64(0x84c87814a1f0ab72), CONST64(0x8cc702081a6439ec), + CONST64(0x90befffa23631e28), CONST64(0xa4506cebde82bde9), + CONST64(0xbef9a3f7b2c67915), CONST64(0xc67178f2e372532b), + CONST64(0xca273eceea26619c), CONST64(0xd186b8c721c0c207), + CONST64(0xeada7dd6cde0eb1e), CONST64(0xf57d4f7fee6ed178), + CONST64(0x06f067aa72176fba), CONST64(0x0a637dc5a2c898a6), + CONST64(0x113f9804bef90dae), CONST64(0x1b710b35131c471b), + CONST64(0x28db77f523047d84), CONST64(0x32caab7b40c72493), + CONST64(0x3c9ebe0a15c9bebc), CONST64(0x431d67c49c100d4c), + CONST64(0x4cc5d4becb3e42b6), CONST64(0x597f299cfc657e2a), + CONST64(0x5fcb6fab3ad6faec), CONST64(0x6c44198c4a475817)}; + +/* 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) ROR64c(x, n) +#define R(x, n) (((x)&CONST64(0xFFFFFFFFFFFFFFFF)) >> ((uint64_t)n)) +#define Sigma0(x) (S(x, 28) ^ S(x, 34) ^ S(x, 39)) +#define Sigma1(x) (S(x, 14) ^ S(x, 18) ^ S(x, 41)) +#define Gamma0(x) (S(x, 1) ^ S(x, 8) ^ R(x, 7)) +#define Gamma1(x) (S(x, 19) ^ S(x, 61) ^ R(x, 6)) + +/* compress 1024-bits */ +static void sha512_compress(sha512_context *md, const uint8_t *buf) +{ + uint64_t S[8], W[80], t0, t1; + int i; + + /* copy state into S */ + for (i = 0; i < 8; i++) { + S[i] = md->state[i]; + } + + /* copy the state into 1024-bits into W[0..15] */ + for (i = 0; i < 16; i++) { + LOAD64H(W[i], buf + (8 * i)); + } + + /* fill W[16..79] */ + for (i = 16; i < 80; i++) { + W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16]; + } + + /* Compress */ +#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; + + for (i = 0; i < 80; i += 8) { + RND(S[0], S[1], S[2], S[3], S[4], S[5], S[6], S[7], i + 0); + RND(S[7], S[0], S[1], S[2], S[3], S[4], S[5], S[6], i + 1); + RND(S[6], S[7], S[0], S[1], S[2], S[3], S[4], S[5], i + 2); + RND(S[5], S[6], S[7], S[0], S[1], S[2], S[3], S[4], i + 3); + RND(S[4], S[5], S[6], S[7], S[0], S[1], S[2], S[3], i + 4); + RND(S[3], S[4], S[5], S[6], S[7], S[0], S[1], S[2], i + 5); + RND(S[2], S[3], S[4], S[5], S[6], S[7], S[0], S[1], i + 6); + RND(S[1], S[2], S[3], S[4], S[5], S[6], S[7], S[0], i + 7); + } + + /* feedback */ + for (i = 0; i < 8; i++) { + md->state[i] = md->state[i] + S[i]; + } + + return; +} + +void sha512_init(sha512_context *md) +{ + md->curlen = 0; + md->length = 0; + md->state[0] = CONST64(0x6a09e667f3bcc908); + md->state[1] = CONST64(0xbb67ae8584caa73b); + md->state[2] = CONST64(0x3c6ef372fe94f82b); + md->state[3] = CONST64(0xa54ff53a5f1d36f1); + md->state[4] = CONST64(0x510e527fade682d1); + md->state[5] = CONST64(0x9b05688c2b3e6c1f); + md->state[6] = CONST64(0x1f83d9abfb41bd6b); + md->state[7] = CONST64(0x5be0cd19137e2179); + return; +} + +void sha512_process(sha512_context *md, const uint8_t *in, size_t inlen) +{ + size_t n; + if (md->curlen > sizeof(md->buf)) { + return; + } + if ((md->length + inlen) < md->length) { + return; + } + while (inlen > 0) { + if (md->curlen == 0 && inlen >= 128) { + sha512_compress(md, in); + md->length += 128 * 8; + in += 128; + inlen -= 128; + } else { + n = (((inlen) < ((128u - md->curlen))) ? (inlen) + : ((128u - md->curlen))); + memcpy(md->buf + md->curlen, in, (size_t)n); + md->curlen += n; + in += n; + inlen -= n; + if (md->curlen == 128) { + sha512_compress(md, md->buf); + md->length += 8 * 128; + md->curlen = 0; + } + } + } + return; +} + +void sha512_done(sha512_context *md, uint8_t *out) +{ + int i; + + if (md->curlen >= sizeof(md->buf)) { + return; + } + + /* increase the length of the message */ + md->length += md->curlen * CONST64(8); + + /* append the '1' bit */ + md->buf[md->curlen++] = (uint8_t)0x80; + + /* if the length is currently above 112 bytes we append zeros + * then compress. Then we can fall back to padding zeros and length + * encoding like normal. + */ + if (md->curlen > 112) { + while (md->curlen < 128) { + md->buf[md->curlen++] = (uint8_t)0; + } + sha512_compress(md, md->buf); + md->curlen = 0; + } + + /* pad upto 120 bytes of zeroes + * note: that from 112 to 120 is the 64 MSB of the length. We assume that + * you won't hash > 2^64 bits of data... :-) + */ + while (md->curlen < 120) { + md->buf[md->curlen++] = (uint8_t)0; + } + + /* store length */ + STORE64H(md->length, md->buf + 120); + sha512_compress(md, md->buf); + + /* copy output */ + for (i = 0; i < 8; i++) { + STORE64H(md->state[i], out + (8 * i)); + } + return; +} + +void sha512_hash(const uint8_t *data, size_t len, uint8_t *digest) +{ + sha512_context md; + sha512_init(&md); + sha512_process(&md, data, len); + sha512_done(&md, digest); +} diff --git a/src/sha512.h b/src/sha512.h new file mode 100644 index 0000000..0b00b97 --- /dev/null +++ b/src/sha512.h @@ -0,0 +1,34 @@ +/* public api for Thomas Pornin's BearSSL SHA-512 implementation */ + +/** @file + * SHA-512 hash API. + */ + +#ifndef __LIBSTROPHE_SHA512_H__ +#define __LIBSTROPHE_SHA512_H__ + +#ifdef __cplusplus +extern "C" { +#endif + +/* make sure the stdint.h types are available */ +#include "ostypes.h" + +typedef struct { + uint64_t length, state[8]; + uint8_t curlen; + uint8_t buf[128]; +} sha512_context; + +#define SHA512_DIGEST_SIZE 64 + +void sha512_init(sha512_context *cc); +void sha512_process(sha512_context *cc, const uint8_t *data, size_t len); +void sha512_done(sha512_context *cc, uint8_t *dst); + +void sha512_hash(const uint8_t *data, size_t len, uint8_t *digest); +#ifdef __cplusplus +} +#endif + +#endif /* __LIBSTROPHE_SHA512_H__ */