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crypto.[sha256/sha512]: remove extraneous casts & use rotations from math.bits

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This commit is contained in:
joe-conigliaro
2019-09-26 23:38:12 +10:00
committed by Alexander Medvednikov
parent c069525e8c
commit 47da52b85b
4 changed files with 14 additions and 12 deletions
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7
vlib/crypto/sha256/sha256block_generic.v
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@@ -99,13 +99,13 @@ fn block_generic(dig mut Digest, p_ []byte) {
// rounds below if needed for speed.
for i := 0; i < 16; i++ {
j := i * 4
w[i] = u32(u32(p[j])<<u32(24)) | u32(u32(p[j+1])<<u32(16)) | u32(u32(p[j+2])<<u32(8)) | u32(p[j+3])
w[i] = u32(p[j]<<24) | u32(p[j+1]<<16) | u32(p[j+2]<<8) | u32(p[j+3])
}
for i := 16; i < 64; i++ {
v1 := w[i-2]
t1 := (bits.rotate_left_32(v1, -17)) ^ (bits.rotate_left_32(v1, -19)) ^ u32((v1 >> u32(10)))
t1 := (bits.rotate_left_32(v1, -17)) ^ (bits.rotate_left_32(v1, -19)) ^ (v1 >> 10)
v2 := w[i-15]
t2 := (bits.rotate_left_32(v2, -7)) ^ (bits.rotate_left_32(v2, -18)) ^ u32((v2 >> u32(3)))
t2 := (bits.rotate_left_32(v2, -7)) ^ (bits.rotate_left_32(v2, -18)) ^ (v2 >> 3)
w[i] = t1 + w[i-7] + t2 + w[i-16]
}
@@ -120,7 +120,6 @@ fn block_generic(dig mut Digest, p_ []byte) {
for i := 0; i < 64; i++ {
t1 := h + ((bits.rotate_left_32(e, -6)) ^ (bits.rotate_left_32(e, -11)) ^ (bits.rotate_left_32(e, -25))) + ((e & f) ^ (~e & g)) + u32(_K[i]) + w[i]
t2 := ((bits.rotate_left_32(a, -2)) ^ (bits.rotate_left_32(a, -13)) ^ (bits.rotate_left_32(a, -22))) + ((a & b) ^ (a & c) ^ (b & c))
h = g