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authorTom Gundersen <teg@jklm.no>2015-10-03 21:27:25 +0200
committerTom Gundersen <teg@jklm.no>2015-10-05 17:33:58 +0200
commitf2936011c535b73a712990af34555daad21edfe0 (patch)
tree48b1e5b8a0ca0b2b151d8247b448efc9e299a49b /src/basic
parentc7b68d84e48b3bd87520cbd87258bb03a1810e70 (diff)
siphash24: move last compression iteration from compression step to finalization step
The last compression is special as it deals with the length byte, and padding. Move it to the finalization step in preparation for making compression decomposable.
Diffstat (limited to 'src/basic')
-rw-r--r--src/basic/siphash24.c58
1 files changed, 32 insertions, 26 deletions
diff --git a/src/basic/siphash24.c b/src/basic/siphash24.c
index 86d4975ff4..8f2f1f5534 100644
--- a/src/basic/siphash24.c
+++ b/src/basic/siphash24.c
@@ -57,6 +57,8 @@ struct siphash {
u64 v1;
u64 v2;
u64 v3;
+ u64 padding;
+ size_t inlen;
};
static void siphash_init(struct siphash *state, const uint8_t k[16]) {
@@ -70,26 +72,27 @@ static void siphash_init(struct siphash *state, const uint8_t k[16]) {
state->v1 = 0x646f72616e646f6dULL ^ k1;
state->v2 = 0x6c7967656e657261ULL ^ k0;
state->v3 = 0x7465646279746573ULL ^ k1;
+ state->padding = 0;
+ state->inlen = 0;
}
static void siphash24_compress(const void *_in, size_t inlen, struct siphash *state) {
- u64 b;
u64 m;
const u8 *in = _in;
const u8 *end = in + inlen - ( inlen % sizeof( u64 ) );
const int left = inlen & 7;
- b = ( ( u64 )inlen ) << 56;
+ state->inlen = inlen;
for ( ; in != end; in += 8 )
{
m = U8TO64_LE( in );
#ifdef DEBUG
- printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( state->v0 >> 32 ), ( u32 )state->v0 );
- printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( state->v1 >> 32 ), ( u32 )state->v1 );
- printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( state->v2 >> 32 ), ( u32 )state->v2 );
- printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( state->v3 >> 32 ), ( u32 )state->v3 );
- printf( "(%3d) compress %08x %08x\n", ( int )inlen, ( u32 )( m >> 32 ), ( u32 )m );
+ printf( "(%3d) v0 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v0 >> 32 ), ( u32 )state->v0 );
+ printf( "(%3d) v1 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v1 >> 32 ), ( u32 )state->v1 );
+ printf( "(%3d) v2 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v2 >> 32 ), ( u32 )state->v2 );
+ printf( "(%3d) v3 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v3 >> 32 ), ( u32 )state->v3 );
+ printf( "(%3d) compress %08x %08x\n", ( int )state->inlen, ( u32 )( m >> 32 ), ( u32 )m );
#endif
state->v3 ^= m;
SIPROUND(state);
@@ -99,43 +102,46 @@ static void siphash24_compress(const void *_in, size_t inlen, struct siphash *st
switch( left )
{
- case 7: b |= ( ( u64 )in[ 6] ) << 48;
+ case 7: state->padding |= ( ( u64 )in[ 6] ) << 48;
- case 6: b |= ( ( u64 )in[ 5] ) << 40;
+ case 6: state->padding |= ( ( u64 )in[ 5] ) << 40;
- case 5: b |= ( ( u64 )in[ 4] ) << 32;
+ case 5: state->padding |= ( ( u64 )in[ 4] ) << 32;
- case 4: b |= ( ( u64 )in[ 3] ) << 24;
+ case 4: state->padding |= ( ( u64 )in[ 3] ) << 24;
- case 3: b |= ( ( u64 )in[ 2] ) << 16;
+ case 3: state->padding |= ( ( u64 )in[ 2] ) << 16;
- case 2: b |= ( ( u64 )in[ 1] ) << 8;
+ case 2: state->padding |= ( ( u64 )in[ 1] ) << 8;
- case 1: b |= ( ( u64 )in[ 0] ); break;
+ case 1: state->padding |= ( ( u64 )in[ 0] ); break;
case 0: break;
}
+}
+
+static u64 siphash24_finalize(struct siphash *state) {
+ u64 b;
+ b = state->padding | (( ( u64 )state->inlen ) << 56);
#ifdef DEBUG
- printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( state->v0 >> 32 ), ( u32 )state->v0 );
- printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( state->v1 >> 32 ), ( u32 )state->v1 );
- printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( state->v2 >> 32 ), ( u32 )state->v2 );
- printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( state->v3 >> 32 ), ( u32 )state->v3 );
- printf( "(%3d) padding %08x %08x\n", ( int )inlen, ( u32 )( b >> 32 ), ( u32 )b );
+ printf( "(%3d) v0 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v0 >> 32 ), ( u32 )state->v0 );
+ printf( "(%3d) v1 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v1 >> 32 ), ( u32 )state->v1 );
+ printf( "(%3d) v2 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v2 >> 32 ), ( u32 )state->v2 );
+ printf( "(%3d) v3 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v3 >> 32 ), ( u32 )state->v3 );
+ printf( "(%3d) padding %08x %08x\n", ( int )state->inlen, ( u32 )( state->padding >> 32 ), ( u32 )state->padding );
#endif
state->v3 ^= b;
SIPROUND(state);
SIPROUND(state);
state->v0 ^= b;
+
#ifdef DEBUG
- printf( "(%3d) v0 %08x %08x\n", ( int )inlen, ( u32 )( state->v0 >> 32 ), ( u32 )state->v0 );
- printf( "(%3d) v1 %08x %08x\n", ( int )inlen, ( u32 )( state->v1 >> 32 ), ( u32 )state->v1 );
- printf( "(%3d) v2 %08x %08x\n", ( int )inlen, ( u32 )( state->v2 >> 32 ), ( u32 )state->v2 );
- printf( "(%3d) v3 %08x %08x\n", ( int )inlen, ( u32 )( state->v3 >> 32 ), ( u32 )state->v3 );
+ printf( "(%3d) v0 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v0 >> 32 ), ( u32 )state->v0 );
+ printf( "(%3d) v1 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v1 >> 32 ), ( u32 )state->v1 );
+ printf( "(%3d) v2 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v2 >> 32 ), ( u32 )state->v2 );
+ printf( "(%3d) v3 %08x %08x\n", ( int )state->inlen, ( u32 )( state->v3 >> 32 ), ( u32 )state->v3 );
#endif
-}
-
-static u64 siphash24_finalize(struct siphash *state) {
state->v2 ^= 0xff;
SIPROUND(state);
SIPROUND(state);