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utils.go
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utils.go
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package streebog
import (
"encoding/binary"
)
// Endianness option
const littleEndian bool = true
func GETU64(ptr []byte) uint64 {
if littleEndian {
return binary.LittleEndian.Uint64(ptr)
} else {
return binary.BigEndian.Uint64(ptr)
}
}
func PUTU64(ptr []byte, a uint64) {
if littleEndian {
binary.LittleEndian.PutUint64(ptr, a)
} else {
binary.BigEndian.PutUint64(ptr, a)
}
}
func bytesToUint64s(b []byte) []uint64 {
size := len(b) / 8
dst := make([]uint64, size)
for i := 0; i < size; i++ {
j := i * 8
if littleEndian {
dst[i] = binary.LittleEndian.Uint64(b[j:])
} else {
dst[i] = binary.BigEndian.Uint64(b[j:])
}
}
return dst
}
func uint64sToBytes(w []uint64) []byte {
size := len(w) * 8
dst := make([]byte, size)
for i := 0; i < len(w); i++ {
j := i * 8
if littleEndian {
binary.LittleEndian.PutUint64(dst[j:], w[i])
} else {
binary.BigEndian.PutUint64(dst[j:], w[i])
}
}
return dst
}
func generateTables() (tables [8][256]uint64) {
var j, m, w, k int
var t, tmp0 byte
var a [8 * 8]byte
for j = 0; j < 8; j++ {
for m = 0; m < 256; m++ {
t = pi[m]
a = [8 * 8]byte{}
tmp0 = t
for w = 0; w < 8; w++ {
if (tmp0 & 1) != 0 {
for k = 0; k < 8; k++ {
a[k] ^= A[63 - 8 * j - w][k]
}
}
tmp0 >>= 1
}
tables[j][m] = GETU64(a[:])
}
}
return
}
func lps_block(block *[8]uint64) {
ch := uint64sToBytes(block[:])
block[0] = T[0][(ch[0])] ^ T[1][(ch[8 + 0])] ^ T[2][(ch[16 + 0])] ^ T[3][(ch[24 + 0])] ^ T[4][(ch[32 + 0])] ^ T[5][(ch[40 + 0])] ^ T[6][(ch[48 + 0])] ^ T[7][(ch[56 + 0])]
block[1] = T[0][(ch[1])] ^ T[1][(ch[8 + 1])] ^ T[2][(ch[16 + 1])] ^ T[3][(ch[24 + 1])] ^ T[4][(ch[32 + 1])] ^ T[5][(ch[40 + 1])] ^ T[6][(ch[48 + 1])] ^ T[7][(ch[56 + 1])]
block[2] = T[0][(ch[2])] ^ T[1][(ch[8 + 2])] ^ T[2][(ch[16 + 2])] ^ T[3][(ch[24 + 2])] ^ T[4][(ch[32 + 2])] ^ T[5][(ch[40 + 2])] ^ T[6][(ch[48 + 2])] ^ T[7][(ch[56 + 2])]
block[3] = T[0][(ch[3])] ^ T[1][(ch[8 + 3])] ^ T[2][(ch[16 + 3])] ^ T[3][(ch[24 + 3])] ^ T[4][(ch[32 + 3])] ^ T[5][(ch[40 + 3])] ^ T[6][(ch[48 + 3])] ^ T[7][(ch[56 + 3])]
block[4] = T[0][(ch[4])] ^ T[1][(ch[8 + 4])] ^ T[2][(ch[16 + 4])] ^ T[3][(ch[24 + 4])] ^ T[4][(ch[32 + 4])] ^ T[5][(ch[40 + 4])] ^ T[6][(ch[48 + 4])] ^ T[7][(ch[56 + 4])]
block[5] = T[0][(ch[5])] ^ T[1][(ch[8 + 5])] ^ T[2][(ch[16 + 5])] ^ T[3][(ch[24 + 5])] ^ T[4][(ch[32 + 5])] ^ T[5][(ch[40 + 5])] ^ T[6][(ch[48 + 5])] ^ T[7][(ch[56 + 5])]
block[6] = T[0][(ch[6])] ^ T[1][(ch[8 + 6])] ^ T[2][(ch[16 + 6])] ^ T[3][(ch[24 + 6])] ^ T[4][(ch[32 + 6])] ^ T[5][(ch[40 + 6])] ^ T[6][(ch[48 + 6])] ^ T[7][(ch[56 + 6])]
block[7] = T[0][(ch[7])] ^ T[1][(ch[8 + 7])] ^ T[2][(ch[16 + 7])] ^ T[3][(ch[24 + 7])] ^ T[4][(ch[32 + 7])] ^ T[5][(ch[40 + 7])] ^ T[6][(ch[48 + 7])] ^ T[7][(ch[56 + 7])]
}
func xor_blocks(block *[8]uint64, toxor [8]uint64) {
block[0] ^= toxor[0]
block[1] ^= toxor[1]
block[2] ^= toxor[2]
block[3] ^= toxor[3]
block[4] ^= toxor[4]
block[5] ^= toxor[5]
block[6] ^= toxor[6]
block[7] ^= toxor[7]
}
func e(K *[8]uint64, m []byte) {
var tmp, mm [8]uint64
copy(tmp[:], K[:])
ms := bytesToUint64s(m)
copy(mm[:], ms)
xor_blocks(K, mm)
for i := 0; i < 12; i++ {
lps_block(K)
xor_blocks(&tmp, RC[i])
lps_block(&tmp)
xor_blocks(K, tmp)
}
}
func gN(h *[8]uint64, m []byte, N uint64) {
var hN, mm [8]uint64
copy(hN[:], h[:])
ms := bytesToUint64s(m)
copy(mm[:], ms)
hN[0] ^= N
lps_block(&hN)
e(&hN, m)
xor_blocks(h, hN)
xor_blocks(h, mm)
}
func addm(m []byte, h *[8]uint64) {
var carry uint64 = 0
var overflow bool = false
var t uint64
m64 := bytesToUint64s(m)
var i int
for i = 0; i < 8; i++ {
t = h[i] + m64[i]
if t < h[i] || t < m64[i] {
overflow = true
} else {
overflow = false
}
h[i] = t + carry
if overflow {
carry = 1
} else {
carry = 0
}
}
}