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Use tables and roll up some loops

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Saves 108 bytes (measured as in previous commit).
This commit is contained in:
Manuel Pégourié-Gonnard 2019-07-17 13:01:56 +02:00
parent 7f0719598f
commit 0270ed99bb
1 changed files with 14 additions and 26 deletions
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40
library/sha512.c
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@ -228,7 +228,7 @@ int mbedtls_internal_sha512_process( mbedtls_sha512_context *ctx,
{ {
int i; int i;
uint64_t temp1, temp2, W[80]; uint64_t temp1, temp2, W[80];
uint64_t A, B, C, D, E, F, G, H; uint64_t A[8];
SHA512_VALIDATE_RET( ctx != NULL ); SHA512_VALIDATE_RET( ctx != NULL );
SHA512_VALIDATE_RET( (const unsigned char *)data != NULL ); SHA512_VALIDATE_RET( (const unsigned char *)data != NULL );
@ -253,6 +253,9 @@ int mbedtls_internal_sha512_process( mbedtls_sha512_context *ctx,
(d) += temp1; (h) = temp1 + temp2; \ (d) += temp1; (h) = temp1 + temp2; \
} while( 0 ) } while( 0 )
for( i = 0; i < 8; i++ )
A[i] = ctx->state[i];
for( i = 0; i < 16; i++ ) for( i = 0; i < 16; i++ )
{ {
GET_UINT64_BE( W[i], data, i << 3 ); GET_UINT64_BE( W[i], data, i << 3 );
@ -264,37 +267,22 @@ int mbedtls_internal_sha512_process( mbedtls_sha512_context *ctx,
S0(W[i - 15]) + W[i - 16]; S0(W[i - 15]) + W[i - 16];
} }
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
E = ctx->state[4];
F = ctx->state[5];
G = ctx->state[6];
H = ctx->state[7];
i = 0; i = 0;
do do
{ {
P( A, B, C, D, E, F, G, H, W[i], K[i] ); i++; P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i] ); i++;
P( H, A, B, C, D, E, F, G, W[i], K[i] ); i++; P( A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], W[i], K[i] ); i++;
P( G, H, A, B, C, D, E, F, W[i], K[i] ); i++; P( A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], W[i], K[i] ); i++;
P( F, G, H, A, B, C, D, E, W[i], K[i] ); i++; P( A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], W[i], K[i] ); i++;
P( E, F, G, H, A, B, C, D, W[i], K[i] ); i++; P( A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], W[i], K[i] ); i++;
P( D, E, F, G, H, A, B, C, W[i], K[i] ); i++; P( A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], W[i], K[i] ); i++;
P( C, D, E, F, G, H, A, B, W[i], K[i] ); i++; P( A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], W[i], K[i] ); i++;
P( B, C, D, E, F, G, H, A, W[i], K[i] ); i++; P( A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], W[i], K[i] ); i++;
} }
while( i < 80 ); while( i < 80 );
ctx->state[0] += A; for( i = 0; i < 8; i++ )
ctx->state[1] += B; ctx->state[i] += A[i];
ctx->state[2] += C;
ctx->state[3] += D;
ctx->state[4] += E;
ctx->state[5] += F;
ctx->state[6] += G;
ctx->state[7] += H;
return( 0 ); return( 0 );
} }