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Diffstat (limited to 'crypto/blake2/blake2s.c')
-rw-r--r-- | crypto/blake2/blake2s.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/crypto/blake2/blake2s.c b/crypto/blake2/blake2s.c new file mode 100644 index 0000000000..174d20cd21 --- /dev/null +++ b/crypto/blake2/blake2s.c @@ -0,0 +1,220 @@ +/* + * BLAKE2 reference source code package - reference C implementations + * + * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>. + * You may use this under the terms of the CC0, the OpenSSL Licence, or the + * Apache Public License 2.0, at your option. The terms of these licenses can + * be found at: + * + * - OpenSSL license : https://www.openssl.org/source/license.html + * - Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0 + * - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0 + * + * More information about the BLAKE2 hash function can be found at + * https://blake2.net. + */ + +/* crypto/blake2/blake2s.c */ + +#include <stdint.h> +#include <string.h> +#include <stdio.h> +#include <openssl/crypto.h> + +#include "internal/blake2_locl.h" +#include "blake2_impl.h" + +static const uint32_t blake2s_IV[8] = +{ + 0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL, + 0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL +}; + +static const uint8_t blake2s_sigma[10][16] = +{ + { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } , + { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } , + { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } , + { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } , + { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } , + { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } , + { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } , + { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } , + { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } , + { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } , +}; + +/* Some helper functions, not necessarily useful */ +static inline void blake2s_set_lastblock(BLAKE2S_CTX *S) +{ + S->f[0] = -1; +} + +/* Increment the data hashed couter. */ +static inline void blake2s_increment_counter(BLAKE2S_CTX *S, + const uint32_t inc) +{ + S->t[0] += inc; + S->t[1] += (S->t[0] < inc); +} + +/* Initialize the hashing state. */ +static inline void blake2s_init0(BLAKE2S_CTX *S) +{ + int i; + + memset(S, 0, sizeof(BLAKE2S_CTX)); + for(i = 0; i < 8; ++i) { + S->h[i] = blake2s_IV[i]; + } +} + +/* init2 xors IV with input parameter block */ +static void blake2s_init_param(BLAKE2S_CTX *S, const BLAKE2S_PARAM *P) +{ + const uint32_t *p = (const uint32_t *)(P); + size_t i; + + /* The param struct is carefully hand packed, and should be 32 bytes on + * every platform. */ + OPENSSL_assert(sizeof(BLAKE2S_PARAM) == 32); + blake2s_init0(S); + /* IV XOR ParamBlock */ + for(i = 0; i < 8; ++i) { + S->h[i] ^= load32(&p[i]); + } +} + +/* Initialize the hashing context. Always returns 1. */ +int BLAKE2s_Init(BLAKE2S_CTX *c) +{ + BLAKE2S_PARAM P[1]; + + P->digest_length = BLAKE2S_DIGEST_LENGTH; + P->key_length = 0; + P->fanout = 1; + P->depth = 1; + store32(&P->leaf_length, 0); + store48(&P->node_offset, 0); + P->node_depth = 0; + P->inner_length = 0; + /* memset(P->reserved, 0, sizeof(P->reserved)); */ + memset(P->salt, 0, sizeof(P->salt)); + memset(P->personal, 0, sizeof(P->personal)); + blake2s_init_param(c, P); + return 1; +} + +/* Permute the state while xoring in the block of data. */ +static void blake2s_compress(BLAKE2S_CTX *S, + const uint8_t block[BLAKE2S_BLOCKBYTES]) +{ + uint32_t m[16]; + uint32_t v[16]; + size_t i; + + for(i = 0; i < 16; ++i) { + m[i] = load32(block + i * sizeof(m[i])); + } + + for(i = 0; i < 8; ++i) { + v[i] = S->h[i]; + } + + v[ 8] = blake2s_IV[0]; + v[ 9] = blake2s_IV[1]; + v[10] = blake2s_IV[2]; + v[11] = blake2s_IV[3]; + v[12] = S->t[0] ^ blake2s_IV[4]; + v[13] = S->t[1] ^ blake2s_IV[5]; + v[14] = S->f[0] ^ blake2s_IV[6]; + v[15] = S->f[1] ^ blake2s_IV[7]; +#define G(r,i,a,b,c,d) \ + do { \ + a = a + b + m[blake2s_sigma[r][2*i+0]]; \ + d = rotr32(d ^ a, 16); \ + c = c + d; \ + b = rotr32(b ^ c, 12); \ + a = a + b + m[blake2s_sigma[r][2*i+1]]; \ + d = rotr32(d ^ a, 8); \ + c = c + d; \ + b = rotr32(b ^ c, 7); \ + } while(0) +#define ROUND(r) \ + do { \ + G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \ + G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \ + G(r,2,v[ 2],v[ 6],v[10],v[14]); \ + G(r,3,v[ 3],v[ 7],v[11],v[15]); \ + G(r,4,v[ 0],v[ 5],v[10],v[15]); \ + G(r,5,v[ 1],v[ 6],v[11],v[12]); \ + G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \ + G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \ + } while(0) + ROUND(0); + ROUND(1); + ROUND(2); + ROUND(3); + ROUND(4); + ROUND(5); + ROUND(6); + ROUND(7); + ROUND(8); + ROUND(9); + + for(i = 0; i < 8; ++i) { + S->h[i] = S->h[i] ^ v[i] ^ v[i + 8]; + } + +#undef G +#undef ROUND +} + +/* Absorb the input data into the hash state. Always returns 1. */ +int BLAKE2s_Update(BLAKE2S_CTX *c, const void *data, size_t datalen) +{ + const uint8_t *in = data; + size_t fill; + + while(datalen > 0) { + fill = sizeof(c->buf) - c->buflen; + /* Must be >, not >=, so that last block can be hashed differently */ + if(datalen > fill) { + memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */ + blake2s_increment_counter(c, BLAKE2S_BLOCKBYTES); + blake2s_compress(c, c->buf); /* Compress */ + c->buflen = 0; + in += fill; + datalen -= fill; + } else { /* datalen <= fill */ + memcpy(c->buf + c->buflen, in, datalen); + c->buflen += datalen; /* Be lazy, do not compress */ + return 1; + } + } + + return 1; +} + +/* + * Finalize the hash state in a way that avoids length extension attacks. + * Always returns 1. + */ +int BLAKE2s_Final(unsigned char *md, BLAKE2S_CTX *c) +{ + int i; + + blake2s_increment_counter(c, (uint32_t)c->buflen); + blake2s_set_lastblock(c); + /* Padding */ + memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen); + blake2s_compress(c, c->buf); + + /* Output full hash to temp buffer */ + for(i = 0; i < 8; ++i) { + store32(md + sizeof(c->h[i]) * i, c->h[i]); + } + + OPENSSL_cleanse(c, sizeof(BLAKE2S_CTX)); + return 1; +} |