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sha256_4way: skip last 3 rounds. 

Pointed out by several people, including Raulo.
nfactor-troky
Jeff Garzik 14 years ago committed by Jeff Garzik
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  1. 4
      sha256_4way.c

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sha256_4way.c
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@ -452,12 +452,16 @@ static void DoubleBlockSHA256(const void* pin, void* pad, const void *pre, unsig
SHA256ROUND(f, g, h, a, b, c, d, e, 59, w11); SHA256ROUND(f, g, h, a, b, c, d, e, 59, w11);
w12 = add4(SIGMA1_256(w10), w5, SIGMA0_256(w13), w12); w12 = add4(SIGMA1_256(w10), w5, SIGMA0_256(w13), w12);
SHA256ROUND(e, f, g, h, a, b, c, d, 60, w12); SHA256ROUND(e, f, g, h, a, b, c, d, 60, w12);
/* Skip last 3-rounds; not necessary for H==0 */
#if 0
w13 = add4(SIGMA1_256(w11), w6, SIGMA0_256(w14), w13); w13 = add4(SIGMA1_256(w11), w6, SIGMA0_256(w14), w13);
SHA256ROUND(d, e, f, g, h, a, b, c, 61, w13); SHA256ROUND(d, e, f, g, h, a, b, c, 61, w13);
w14 = add4(SIGMA1_256(w12), w7, SIGMA0_256(w15), w14); w14 = add4(SIGMA1_256(w12), w7, SIGMA0_256(w15), w14);
SHA256ROUND(c, d, e, f, g, h, a, b, 62, w14); SHA256ROUND(c, d, e, f, g, h, a, b, 62, w14);
w15 = add4(SIGMA1_256(w13), w8, SIGMA0_256(w0), w15); w15 = add4(SIGMA1_256(w13), w8, SIGMA0_256(w0), w15);
SHA256ROUND(b, c, d, e, f, g, h, a, 63, w15); SHA256ROUND(b, c, d, e, f, g, h, a, 63, w15);
#endif
/* store resulsts directly in thash */ /* store resulsts directly in thash */
#define store_2(x,i) \ #define store_2(x,i) \

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