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utils.go
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/
utils.go
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package mars2
import (
"math/bits"
"encoding/binary"
)
func rotl(x, n uint32) uint32 {
return bits.RotateLeft32(x, int(n))
}
func rotr(x, n uint32) uint32 {
return rotl(x, 32 - n);
}
// Endianness option
const littleEndian bool = true
func bytesToUint32s(inp []byte) [4]uint32 {
var blk [4]uint32
if littleEndian {
blk[0] = binary.LittleEndian.Uint32(inp[0:])
blk[1] = binary.LittleEndian.Uint32(inp[4:])
blk[2] = binary.LittleEndian.Uint32(inp[8:])
blk[3] = binary.LittleEndian.Uint32(inp[12:])
} else {
blk[0] = binary.BigEndian.Uint32(inp[0:])
blk[1] = binary.BigEndian.Uint32(inp[4:])
blk[2] = binary.BigEndian.Uint32(inp[8:])
blk[3] = binary.BigEndian.Uint32(inp[12:])
}
return blk
}
func uint32sToBytes(blk [4]uint32) [16]byte {
var sav [16]byte
if littleEndian {
binary.LittleEndian.PutUint32(sav[0:], blk[0])
binary.LittleEndian.PutUint32(sav[4:], blk[1])
binary.LittleEndian.PutUint32(sav[8:], blk[2])
binary.LittleEndian.PutUint32(sav[12:], blk[3])
} else {
binary.BigEndian.PutUint32(sav[0:], blk[0])
binary.BigEndian.PutUint32(sav[4:], blk[1])
binary.BigEndian.PutUint32(sav[8:], blk[2])
binary.BigEndian.PutUint32(sav[12:], blk[3])
}
return sav
}
func keyToUint32s(b []byte) []uint32 {
size := len(b) / 4
dst := make([]uint32, size)
for i := 0; i < size; i++ {
j := i * 4
if littleEndian {
dst[i] = binary.LittleEndian.Uint32(b[j:])
} else {
dst[i] = binary.BigEndian.Uint32(b[j:])
}
}
return dst
}