/* * public domain blake2 implementation adapted from the reference * implementation by Samuel Neves * More information about the BLAKE2 hash function can be found at * https://blake2.net. */ #include #include #include #include "blake2.h" static uint64_t load64( const void *src ) { #if defined(NATIVE_LITTLE_ENDIAN) uint64_t w; memcpy(&w, src, sizeof w); return w; #else const uint8_t *p = ( const uint8_t * )src; return (( uint64_t )( p[0] ) << 0) | (( uint64_t )( p[1] ) << 8) | (( uint64_t )( p[2] ) << 16) | (( uint64_t )( p[3] ) << 24) | (( uint64_t )( p[4] ) << 32) | (( uint64_t )( p[5] ) << 40) | (( uint64_t )( p[6] ) << 48) | (( uint64_t )( p[7] ) << 56) ; #endif } static void store32( void *dst, uint32_t w ) { #if defined(NATIVE_LITTLE_ENDIAN) memcpy(dst, &w, sizeof w); #else uint8_t *p = ( uint8_t * )dst; p[0] = (uint8_t)(w >> 0); p[1] = (uint8_t)(w >> 8); p[2] = (uint8_t)(w >> 16); p[3] = (uint8_t)(w >> 24); #endif } static void store64( void *dst, uint64_t w ) { #if defined(NATIVE_LITTLE_ENDIAN) memcpy(dst, &w, sizeof w); #else uint8_t *p = ( uint8_t * )dst; p[0] = (uint8_t)(w >> 0); p[1] = (uint8_t)(w >> 8); p[2] = (uint8_t)(w >> 16); p[3] = (uint8_t)(w >> 24); p[4] = (uint8_t)(w >> 32); p[5] = (uint8_t)(w >> 40); p[6] = (uint8_t)(w >> 48); p[7] = (uint8_t)(w >> 56); #endif } static uint64_t rotr64( const uint64_t w, const unsigned c ) { return ( w >> c ) | ( w << ( 64 - c ) ); } /* prevents compiler optimizing out memset() */ static void secure_zero_memory(void *v, size_t n) { static void *(*const volatile memset_v)(void *, int, size_t) = &memset; memset_v(v, 0, n); } static const uint64_t blake2b_IV[8] = { 0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL, 0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL, 0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL, 0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL }; static const uint8_t blake2b_sigma[12][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 } , { 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 } }; static void blake2b_set_lastnode( blake2b_state *S ) { S->f[1] = (uint64_t)-1; } /* Some helper functions, not necessarily useful */ static int blake2b_is_lastblock( const blake2b_state *S ) { return S->f[0] != 0; } static void blake2b_set_lastblock( blake2b_state *S ) { if( S->last_node ) blake2b_set_lastnode( S ); S->f[0] = (uint64_t)-1; } static void blake2b_increment_counter( blake2b_state *S, const uint64_t inc ) { S->t[0] += inc; S->t[1] += ( S->t[0] < inc ); } static void blake2b_init0( blake2b_state *S ) { size_t i; memset( S, 0, sizeof( blake2b_state ) ); for( i = 0; i < 8; ++i ) S->h[i] = blake2b_IV[i]; } /* init xors IV with input parameter block */ int blake2b_init_param( blake2b_state *S, const blake2b_param *P ) { const uint8_t *p = ( const uint8_t * )( P ); size_t i; blake2b_init0( S ); /* IV XOR ParamBlock */ for( i = 0; i < 8; ++i ) S->h[i] ^= load64( p + sizeof( S->h[i] ) * i ); S->outlen = P->digest_length; return 0; } int blake2b_init( blake2b_state *S, size_t outlen ) { blake2b_param P[1]; if ( ( !outlen ) || ( outlen > BLAKE2B_OUTBYTES ) ) return -1; P->digest_length = (uint8_t)outlen; P->key_length = 0; P->fanout = 1; P->depth = 1; store32( &P->leaf_length, 0 ); store32( &P->node_offset, 0 ); store32( &P->xof_length, 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 ) ); return blake2b_init_param( S, P ); } int blake2b_init_key( blake2b_state *S, size_t outlen, const void *key, size_t keylen ) { blake2b_param P[1]; if ( ( !outlen ) || ( outlen > BLAKE2B_OUTBYTES ) ) return -1; if ( !key || !keylen || keylen > BLAKE2B_KEYBYTES ) return -1; P->digest_length = (uint8_t)outlen; P->key_length = (uint8_t)keylen; P->fanout = 1; P->depth = 1; store32( &P->leaf_length, 0 ); store32( &P->node_offset, 0 ); store32( &P->xof_length, 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 ) ); if( blake2b_init_param( S, P ) < 0 ) return -1; { uint8_t block[BLAKE2B_BLOCKBYTES]; memset( block, 0, BLAKE2B_BLOCKBYTES ); memcpy( block, key, keylen ); blake2b_update( S, block, BLAKE2B_BLOCKBYTES ); secure_zero_memory( block, BLAKE2B_BLOCKBYTES ); /* Burn the key from stack */ } return 0; } #define G(r,i,a,b,c,d) \ do { \ a = a + b + m[blake2b_sigma[r][2*i+0]]; \ d = rotr64(d ^ a, 32); \ c = c + d; \ b = rotr64(b ^ c, 24); \ a = a + b + m[blake2b_sigma[r][2*i+1]]; \ d = rotr64(d ^ a, 16); \ c = c + d; \ b = rotr64(b ^ c, 63); \ } 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) static void blake2b_compress( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] ) { uint64_t m[16]; uint64_t v[16]; size_t i; for( i = 0; i < 16; ++i ) { m[i] = load64( block + i * sizeof( m[i] ) ); } for( i = 0; i < 8; ++i ) { v[i] = S->h[i]; } v[ 8] = blake2b_IV[0]; v[ 9] = blake2b_IV[1]; v[10] = blake2b_IV[2]; v[11] = blake2b_IV[3]; v[12] = blake2b_IV[4] ^ S->t[0]; v[13] = blake2b_IV[5] ^ S->t[1]; v[14] = blake2b_IV[6] ^ S->f[0]; v[15] = blake2b_IV[7] ^ S->f[1]; ROUND( 0 ); ROUND( 1 ); ROUND( 2 ); ROUND( 3 ); ROUND( 4 ); ROUND( 5 ); ROUND( 6 ); ROUND( 7 ); ROUND( 8 ); ROUND( 9 ); ROUND( 10 ); ROUND( 11 ); for( i = 0; i < 8; ++i ) { S->h[i] = S->h[i] ^ v[i] ^ v[i + 8]; } } #undef G #undef ROUND int blake2b_update( blake2b_state *S, const void *pin, size_t inlen ) { const unsigned char * in = (const unsigned char *)pin; if( inlen > 0 ) { size_t left = S->buflen; size_t fill = BLAKE2B_BLOCKBYTES - left; if( inlen > fill ) { S->buflen = 0; memcpy( S->buf + left, in, fill ); /* Fill buffer */ blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES ); blake2b_compress( S, S->buf ); /* Compress */ in += fill; inlen -= fill; while(inlen > BLAKE2B_BLOCKBYTES) { blake2b_increment_counter(S, BLAKE2B_BLOCKBYTES); blake2b_compress( S, in ); in += BLAKE2B_BLOCKBYTES; inlen -= BLAKE2B_BLOCKBYTES; } } memcpy( S->buf + S->buflen, in, inlen ); S->buflen += inlen; } return 0; } int blake2b_final( blake2b_state *S, void *out, size_t outlen ) { uint8_t buffer[BLAKE2B_OUTBYTES] = {0}; size_t i; if( out == NULL || outlen < S->outlen ) return -1; if( blake2b_is_lastblock( S ) ) return -1; blake2b_increment_counter( S, S->buflen ); blake2b_set_lastblock( S ); memset( S->buf + S->buflen, 0, BLAKE2B_BLOCKBYTES - S->buflen ); /* Padding */ blake2b_compress( S, S->buf ); for( i = 0; i < 8; ++i ) /* Output full hash to temp buffer */ store64( buffer + sizeof( S->h[i] ) * i, S->h[i] ); memcpy( out, buffer, S->outlen ); secure_zero_memory(buffer, sizeof(buffer)); return 0; } /* inlen, at least, should be uint64_t. Others can be size_t. */ int blake2b( void *out, size_t outlen, const void *in, size_t inlen, const void *key, size_t keylen ) { blake2b_state S[1]; /* Verify parameters */ if ( NULL == in && inlen > 0 ) return -1; if ( NULL == out ) return -1; if( NULL == key && keylen > 0 ) return -1; if( !outlen || outlen > BLAKE2B_OUTBYTES ) return -1; if( keylen > BLAKE2B_KEYBYTES ) return -1; if( keylen > 0 ) { if( blake2b_init_key( S, outlen, key, keylen ) < 0 ) return -1; } else { if( blake2b_init( S, outlen ) < 0 ) return -1; } blake2b_update( S, ( const uint8_t * )in, inlen ); blake2b_final( S, out, outlen ); return 0; } int blake2( void *out, size_t outlen, const void *in, size_t inlen, const void *key, size_t keylen ) { return blake2b(out, outlen, in, inlen, key, keylen); }