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utils.go
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/
utils.go
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package sm4
import (
"math/bits"
"encoding/binary"
)
// Endianness option
const littleEndian bool = false
func bytesToUint32(inp []byte) (blk uint32) {
if littleEndian {
blk = binary.LittleEndian.Uint32(inp[0:])
} else {
blk = binary.BigEndian.Uint32(inp[0:])
}
return
}
func uint32ToBytes(blk uint32) [4]byte {
var sav [4]byte
if littleEndian {
binary.LittleEndian.PutUint32(sav[0:], blk)
} else {
binary.BigEndian.PutUint32(sav[0:], blk)
}
return sav
}
func rotl(a uint32, n uint32) uint32 {
return bits.RotateLeft32(a, int(n))
}
func tNonLinSub(X uint32) uint32 {
var t uint32 = 0
t |= uint32(sbox[byte(X >> 24)]) << 24
t |= uint32(sbox[byte(X >> 16)]) << 16
t |= uint32(sbox[byte(X >> 8)]) << 8
t |= uint32(sbox[byte(X )])
return t
}
func tSlow(X uint32) uint32 {
var t uint32 = tNonLinSub(X)
/*
* L linear transform
*/
return t ^
rotl(t, 2) ^
rotl(t, 10) ^
rotl(t, 18) ^
rotl(t, 24)
}
func tSbox(X uint32) uint32 {
return sbox_t0[byte(X >> 24)] ^
sbox_t1[byte(X >> 16)] ^
sbox_t2[byte(X >> 8)] ^
sbox_t3[byte(X )]
}
func keySub(X uint32) uint32 {
var t uint32 = tNonLinSub(X)
return t ^ rotl(t, 13) ^ rotl(t, 23)
}