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This commit is contained in:
Henry Case 2021-03-08 23:54:47 +00:00
parent 29c33a33a7
commit d2896a16e8
2 changed files with 25 additions and 8 deletions
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26
hash/sha2/compress.go
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@ -4,6 +4,10 @@ func rotl32(count uint32, val uint32) uint32 {
return (val << count) | (val >> (32 - count))
}
func rotr32(count uint32, val uint32) uint32 {
return (val >> count) | (val << (32 - count))
}
// compression
func p0(X uint32) uint32 {
return X ^ rotl32(9, X) ^ rotl32(17, X)
@ -14,12 +18,22 @@ func p1(X uint32) uint32 {
return X ^ rotl32(15, X) ^ rotl32(23, X)
}
func ff1(X uint32, Y uint32, Z uint32) uint32 {
return (X & Y) | ((X | Y) & Z)
// Choose bitwise between A or B controlled by C. A if C=1 otherwise B
// Optimized as per, "Hackers Delight" (7-1, MUX operation), can be used
// to reduce number of operations.
func ch(M uint32, A uint32, B uint32) uint32 {
return ((A ^ B) & M) ^ B
}
func gg1(X uint32, Y uint32, Z uint32) uint32 {
return (X & Y) ^ ((^X) & Z) // Can be also (Z ^ (X & (Y ^ Z)))
// Majority function - takes the majority value as the final result. If two
// or three of the variables are 1, then the result is 1, otherwise 0.
func maj(X uint32, Y uint32, Z uint32) uint32 {
// Y^Z works as a mask. If mask is 0, then majority is dictated by
// value of either Y or Z (doesn't matter, as they are the same, but we
// don't know if result is 0 or 1). Otherwise Y!=Z and results is
// going to dicated by X.
return ch(Y^Z, X, Y)
}
func r1(
@ -43,8 +57,8 @@ func r2(
A12 := rotl32(12, A)
SS1 := rotl32(7, A12+E+TJ)
TT1 := ff1(A, *B, C) + *D + (SS1 ^ A12) + Wj
TT2 := gg1(E, *F, G) + *H + SS1 + Wi
TT1 := maj(A, *B, C) + *D + (SS1 ^ A12) + Wj
TT2 := ch(E, *F, G) + *H + SS1 + Wi
*B = rotl32(9, *B)
*D = TT1

7
hash/sha2/sha2_test.go
View File

@ -36,8 +36,12 @@ func TestSHA256OfficialVectors(t *testing.T) {
[32]byte{
0xe3,0xb0,0xc4,0x42,0x98,0xfc,0x1c,0x14,0x9a,0xfb,0xf4,0xc8,0x99,0x6f,0xb9,0x24,0x27,0xae,0x41,0xe4,0x64,0x9b,0x93,0x4c,0xa4,0x95,0x99,0x1b,0x78,0x52,0xb8,0x55},
},
{
[]byte{0x61},
[32]byte{
0xca,0x97,0x81,0x12,0xca,0x1b,0xbd,0xca,0xfa,0xc2,0x31,0xb3,0x9a,0x23,0xdc,0x4d,0xa7,0x86,0xef,0xf8,0x14,0x7c,0x4e,0x72,0xb9,0x80,0x77,0x85,0xaf,0xee,0x48,0xbb},
},
/*
// draft-shen-sha2-hash-01: Example 2
{
[]byte{
0x61, 0x62, 0x63, 0x64, 0x61, 0x62, 0x63, 0x64, 0x61, 0x62, 0x63, 0x64, 0x61, 0x62, 0x63, 0x64,
@ -48,7 +52,6 @@ func TestSHA256OfficialVectors(t *testing.T) {
0xde, 0xbe, 0x9f, 0xf9, 0x22, 0x75, 0xb8, 0xa1, 0x38, 0x60, 0x48, 0x89, 0xc1, 0x8e, 0x5a, 0x4d,
0x6f, 0xdb, 0x70, 0xe5, 0x38, 0x7e, 0x57, 0x65, 0x29, 0x3d, 0xcb, 0xa3, 0x9c, 0x0c, 0x57, 0x32},
},
// B.1. GB/T 32918.2-2016 A.2 Example 1
{
[]byte{
0x00, 0x90, 0x41, 0x4C, 0x49, 0x43, 0x45, 0x31, 0x32, 0x33, 0x40, 0x59, 0x41, 0x48, 0x4F, 0x4F,