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utils.go
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/
utils.go
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package panama
import (
"math/bits"
"encoding/binary"
)
func ROTL32(x, n uint32) uint32 {
return bits.RotateLeft32(x, int(n))
}
/* tau, rotate word 'a' to the left by rol_bits bit positions */
func tau(a, rol_bits uint32) uint32 {
return ROTL32(a, rol_bits)
}
// Endianness option
const littleEndian bool = false
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 keymatToBytes(w [8]uint32) (bytes [32]byte) {
size := len(w) * 4
dst := make([]byte, size)
for i := 0; i < len(w); i++ {
j := i * 4
if littleEndian {
binary.LittleEndian.PutUint32(dst[j:], w[i])
} else {
binary.BigEndian.PutUint32(dst[j:], w[i])
}
}
copy(bytes[:], dst)
return
}