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utils.go
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/
utils.go
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package blake256
import (
"math/bits"
"encoding/binary"
)
// Endianness option
const littleEndian bool = false
func putu64(ptr []byte, a uint64) {
if littleEndian {
binary.LittleEndian.PutUint64(ptr, a)
} else {
binary.BigEndian.PutUint64(ptr, a)
}
}
func bytesToUint32s(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
}
func uint32sToBytes(w []uint32) []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])
}
}
return dst
}
func rotr(x uint32, n int) uint32 {
return bits.RotateLeft32(x, 32 - n)
}
func G(v *[16]uint32, m []uint32, i int, a, b, c, d, e int) {
v[a] += (m[sigma[i][e]] ^ u256[sigma[i][e+1]]) + v[b]
v[d] = rotr(v[d] ^ v[a], 16)
v[c] += v[d]
v[b] = rotr(v[b] ^ v[c], 12)
v[a] += (m[sigma[i][e+1]] ^ u256[sigma[i][e]])+v[b]
v[d] = rotr(v[d] ^ v[a], 8)
v[c] += v[d]
v[b] = rotr(v[b] ^ v[c], 7)
}