diff options
Diffstat (limited to 'src/basic/siphash24.c')
| -rw-r--r-- | src/basic/siphash24.c | 99 |
1 files changed, 54 insertions, 45 deletions
diff --git a/src/basic/siphash24.c b/src/basic/siphash24.c index d2e4077f8a..10fc56da69 100644 --- a/src/basic/siphash24.c +++ b/src/basic/siphash24.c @@ -53,37 +53,40 @@ void siphash24_init(struct siphash *state, const uint8_t k[16]) { assert(state); assert(k); - k0 = le64toh(*(le64_t*) k); - k1 = le64toh(*(le64_t*) (k + 8)); - - /* "somepseudorandomlygeneratedbytes" */ - state->v0 = 0x736f6d6570736575ULL ^ k0; - state->v1 = 0x646f72616e646f6dULL ^ k1; - state->v2 = 0x6c7967656e657261ULL ^ k0; - state->v3 = 0x7465646279746573ULL ^ k1; - state->padding = 0; - state->inlen = 0; + k0 = unaligned_read_le64(k); + k1 = unaligned_read_le64(k + 8); + + *state = (struct siphash) { + /* "somepseudorandomlygeneratedbytes" */ + .v0 = 0x736f6d6570736575ULL ^ k0, + .v1 = 0x646f72616e646f6dULL ^ k1, + .v2 = 0x6c7967656e657261ULL ^ k0, + .v3 = 0x7465646279746573ULL ^ k1, + .padding = 0, + .inlen = 0, + }; } void siphash24_compress(const void *_in, size_t inlen, struct siphash *state) { - uint64_t m; + const uint8_t *in = _in; const uint8_t *end = in + inlen; - unsigned left = state->inlen & 7; + size_t left = state->inlen & 7; + uint64_t m; assert(in); assert(state); - /* update total length */ + /* Update total length */ state->inlen += inlen; - /* if padding exists, fill it out */ + /* If padding exists, fill it out */ if (left > 0) { - for ( ; in < end && left < 8; in ++, left ++ ) - state->padding |= ( ( uint64_t )*in ) << (left * 8); + for ( ; in < end && left < 8; in ++, left ++) + state->padding |= ((uint64_t) *in) << (left * 8); if (in == end && left < 8) - /* we did not have enough input to fill out the padding completely */ + /* We did not have enough input to fill out the padding completely */ return; #ifdef DEBUG @@ -93,6 +96,7 @@ void siphash24_compress(const void *_in, size_t inlen, struct siphash *state) { printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3); printf("(%3zu) compress padding %08x %08x\n", state->inlen, (uint32_t) (state->padding >> 32), (uint32_t)state->padding); #endif + state->v3 ^= state->padding; sipround(state); sipround(state); @@ -101,9 +105,9 @@ void siphash24_compress(const void *_in, size_t inlen, struct siphash *state) { state->padding = 0; } - end -= ( state->inlen % sizeof (uint64_t) ); + end -= (state->inlen % sizeof(uint64_t)); - for ( ; in < end; in += 8 ) { + for ( ; in < end; in += 8) { m = unaligned_read_le64(in); #ifdef DEBUG printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0); @@ -119,38 +123,41 @@ void siphash24_compress(const void *_in, size_t inlen, struct siphash *state) { } left = state->inlen & 7; - - switch(left) - { - case 7: state->padding |= ((uint64_t) in[6]) << 48; - - case 6: state->padding |= ((uint64_t) in[5]) << 40; - - case 5: state->padding |= ((uint64_t) in[4]) << 32; - - case 4: state->padding |= ((uint64_t) in[3]) << 24; - - case 3: state->padding |= ((uint64_t) in[2]) << 16; - - case 2: state->padding |= ((uint64_t) in[1]) << 8; - - case 1: state->padding |= ((uint64_t) in[0]); break; - - case 0: break; + switch (left) { + case 7: + state->padding |= ((uint64_t) in[6]) << 48; + case 6: + state->padding |= ((uint64_t) in[5]) << 40; + case 5: + state->padding |= ((uint64_t) in[4]) << 32; + case 4: + state->padding |= ((uint64_t) in[3]) << 24; + case 3: + state->padding |= ((uint64_t) in[2]) << 16; + case 2: + state->padding |= ((uint64_t) in[1]) << 8; + case 1: + state->padding |= ((uint64_t) in[0]); + case 0: + break; } } uint64_t siphash24_finalize(struct siphash *state) { uint64_t b; - b = state->padding | (( ( uint64_t )state->inlen ) << 56); + assert(state); + + b = state->padding | (((uint64_t) state->inlen) << 56); + #ifdef DEBUG - printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t)state->v0); - printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t)state->v1); - printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t)state->v2); - printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t)state->v3); + printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0); + printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1); + printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2); + printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3); printf("(%3zu) padding %08x %08x\n", state->inlen, (uint32_t) (state->padding >> 32), (uint32_t) state->padding); #endif + state->v3 ^= b; sipround(state); sipround(state); @@ -172,12 +179,14 @@ uint64_t siphash24_finalize(struct siphash *state) { return state->v0 ^ state->v1 ^ state->v2 ^ state->v3; } -/* SipHash-2-4 */ -uint64_t siphash24(const void *_in, size_t inlen, const uint8_t k[16]) { +uint64_t siphash24(const void *in, size_t inlen, const uint8_t k[16]) { struct siphash state; + assert(in); + assert(k); + siphash24_init(&state, k); - siphash24_compress(_in, inlen, &state); + siphash24_compress(in, inlen, &state); return siphash24_finalize(&state); } |