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add USE_SLOW_SHA2 for sha384 and sha512, over twice as small code but over 50% slower too

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toddouska 2014-01-03 12:32:14 -08:00
parent 9d0e991e41
commit d6ad10f027
1 changed files with 24 additions and 2 deletions
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26
ctaocrypt/src/sha512.c
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@ -146,13 +146,24 @@ static void Transform(Sha512* sha512)
/* Copy digest to working vars */
XMEMCPY(T, sha512->digest, sizeof(T));
/* 64 operations, partially loop unrolled */
#ifdef USE_SLOW_SHA2
/* over twice as small, but 50% slower */
/* 80 operations, not unrolled */
for (j = 0; j < 80; j += 16) {
int m;
for (m = 0; m < 16; m++) { /* braces needed here for macros {} */
R(m);
}
}
#else
/* 80 operations, partially loop unrolled */
for (j = 0; j < 80; j += 16) {
R( 0); R( 1); R( 2); R( 3);
R( 4); R( 5); R( 6); R( 7);
R( 8); R( 9); R(10); R(11);
R(12); R(13); R(14); R(15);
}
#endif /* USE_SLOW_SHA2 */
/* Add the working vars back into digest */
@ -280,13 +291,24 @@ static void Transform384(Sha384* sha384)
/* Copy digest to working vars */
XMEMCPY(T, sha384->digest, sizeof(T));
/* 64 operations, partially loop unrolled */
#ifdef USE_SLOW_SHA2
/* over twice as small, but 50% slower */
/* 80 operations, not unrolled */
for (j = 0; j < 80; j += 16) {
int m;
for (m = 0; m < 16; m++) { /* braces needed for macros {} */
R2(m);
}
}
#else
/* 80 operations, partially loop unrolled */
for (j = 0; j < 80; j += 16) {
R2( 0); R2( 1); R2( 2); R2( 3);
R2( 4); R2( 5); R2( 6); R2( 7);
R2( 8); R2( 9); R2(10); R2(11);
R2(12); R2(13); R2(14); R2(15);
}
#endif /* USE_SLOW_SHA2 */
/* Add the working vars back into digest */