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Re-roll main loop with SHA512_SMALLER

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Saves 1924 bytes (same measurement as before).
This commit is contained in:
Manuel Pégourié-Gonnard 2019-07-17 13:16:54 +02:00
parent 0270ed99bb
commit 49d65ba929
1 changed files with 20 additions and 0 deletions
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20
library/sha512.c
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@ -256,6 +256,25 @@ int mbedtls_internal_sha512_process( mbedtls_sha512_context *ctx,
for( i = 0; i < 8; i++ )
A[i] = ctx->state[i];
#if defined(MBEDTLS_SHA512_SMALLER)
for( i = 0; i < 80; i++ )
{
if( i < 16 )
{
GET_UINT64_BE( W[i], data, i << 3 );
}
else
{
W[i] = S1(W[i - 2]) + W[i - 7] +
S0(W[i - 15]) + W[i - 16];
}
P( A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i] );
temp1 = A[7]; A[7] = A[6]; A[6] = A[5]; A[5] = A[4]; A[4] = A[3];
A[3] = A[2]; A[2] = A[1]; A[1] = A[0]; A[0] = temp1;
}
#else /* MBEDTLS_SHA512_SMALLER */
for( i = 0; i < 16; i++ )
{
GET_UINT64_BE( W[i], data, i << 3 );
@ -280,6 +299,7 @@ int mbedtls_internal_sha512_process( mbedtls_sha512_context *ctx,
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 );
#endif /* MBEDTLS_SHA512_SMALLER */
for( i = 0; i < 8; i++ )
ctx->state[i] += A[i];