diff options
Diffstat (limited to 'vendor/github.com/zeebo/blake3/internal/utils/utils.go')
| -rw-r--r-- | vendor/github.com/zeebo/blake3/internal/utils/utils.go | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/vendor/github.com/zeebo/blake3/internal/utils/utils.go b/vendor/github.com/zeebo/blake3/internal/utils/utils.go new file mode 100644 index 000000000..0b36f0f0f --- /dev/null +++ b/vendor/github.com/zeebo/blake3/internal/utils/utils.go @@ -0,0 +1,60 @@ +package utils + +import ( + "encoding/binary" + "unsafe" +) + +func SliceToArray32(bytes []byte) *[32]uint8 { return (*[32]uint8)(unsafe.Pointer(&bytes[0])) } +func SliceToArray64(bytes []byte) *[64]uint8 { return (*[64]uint8)(unsafe.Pointer(&bytes[0])) } + +func BytesToWords(bytes *[64]uint8, words *[16]uint32) { + words[0] = binary.LittleEndian.Uint32(bytes[0*4:]) + words[1] = binary.LittleEndian.Uint32(bytes[1*4:]) + words[2] = binary.LittleEndian.Uint32(bytes[2*4:]) + words[3] = binary.LittleEndian.Uint32(bytes[3*4:]) + words[4] = binary.LittleEndian.Uint32(bytes[4*4:]) + words[5] = binary.LittleEndian.Uint32(bytes[5*4:]) + words[6] = binary.LittleEndian.Uint32(bytes[6*4:]) + words[7] = binary.LittleEndian.Uint32(bytes[7*4:]) + words[8] = binary.LittleEndian.Uint32(bytes[8*4:]) + words[9] = binary.LittleEndian.Uint32(bytes[9*4:]) + words[10] = binary.LittleEndian.Uint32(bytes[10*4:]) + words[11] = binary.LittleEndian.Uint32(bytes[11*4:]) + words[12] = binary.LittleEndian.Uint32(bytes[12*4:]) + words[13] = binary.LittleEndian.Uint32(bytes[13*4:]) + words[14] = binary.LittleEndian.Uint32(bytes[14*4:]) + words[15] = binary.LittleEndian.Uint32(bytes[15*4:]) +} + +func WordsToBytes(words *[16]uint32, bytes []byte) { + bytes = bytes[:64] + binary.LittleEndian.PutUint32(bytes[0*4:1*4], words[0]) + binary.LittleEndian.PutUint32(bytes[1*4:2*4], words[1]) + binary.LittleEndian.PutUint32(bytes[2*4:3*4], words[2]) + binary.LittleEndian.PutUint32(bytes[3*4:4*4], words[3]) + binary.LittleEndian.PutUint32(bytes[4*4:5*4], words[4]) + binary.LittleEndian.PutUint32(bytes[5*4:6*4], words[5]) + binary.LittleEndian.PutUint32(bytes[6*4:7*4], words[6]) + binary.LittleEndian.PutUint32(bytes[7*4:8*4], words[7]) + binary.LittleEndian.PutUint32(bytes[8*4:9*4], words[8]) + binary.LittleEndian.PutUint32(bytes[9*4:10*4], words[9]) + binary.LittleEndian.PutUint32(bytes[10*4:11*4], words[10]) + binary.LittleEndian.PutUint32(bytes[11*4:12*4], words[11]) + binary.LittleEndian.PutUint32(bytes[12*4:13*4], words[12]) + binary.LittleEndian.PutUint32(bytes[13*4:14*4], words[13]) + binary.LittleEndian.PutUint32(bytes[14*4:15*4], words[14]) + binary.LittleEndian.PutUint32(bytes[15*4:16*4], words[15]) +} + +func KeyFromBytes(key []byte, out *[8]uint32) { + key = key[:32] + out[0] = binary.LittleEndian.Uint32(key[0:]) + out[1] = binary.LittleEndian.Uint32(key[4:]) + out[2] = binary.LittleEndian.Uint32(key[8:]) + out[3] = binary.LittleEndian.Uint32(key[12:]) + out[4] = binary.LittleEndian.Uint32(key[16:]) + out[5] = binary.LittleEndian.Uint32(key[20:]) + out[6] = binary.LittleEndian.Uint32(key[24:]) + out[7] = binary.LittleEndian.Uint32(key[28:]) +} |