File: cipher_asm.go

package info (click to toggle)
gcc-avr 1%3A5.4.0%2BAtmel3.6.1-2
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 589,832 kB
  • sloc: ansic: 2,775,567; ada: 756,757; cpp: 723,977; f90: 117,673; asm: 66,896; makefile: 62,755; xml: 44,466; sh: 29,549; exp: 23,315; objc: 15,216; fortran: 10,901; pascal: 4,185; python: 4,093; perl: 2,969; awk: 2,811; ml: 2,385; cs: 879; yacc: 316; lex: 198; haskell: 112; lisp: 8
file content (48 lines) | stat: -rw-r--r-- 1,059 bytes parent folder | download | duplicates (23) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build amd64

package aes

// defined in asm_$GOARCH.s
func hasAsm() bool
func encryptBlockAsm(nr int, xk *uint32, dst, src *byte)
func decryptBlockAsm(nr int, xk *uint32, dst, src *byte)
func expandKeyAsm(nr int, key *byte, enc *uint32, dec *uint32)

var useAsm = hasAsm()

func encryptBlock(xk []uint32, dst, src []byte) {
	if useAsm {
		encryptBlockAsm(len(xk)/4-1, &xk[0], &dst[0], &src[0])
	} else {
		encryptBlockGo(xk, dst, src)
	}
}

func decryptBlock(xk []uint32, dst, src []byte) {
	if useAsm {
		decryptBlockAsm(len(xk)/4-1, &xk[0], &dst[0], &src[0])
	} else {
		decryptBlockGo(xk, dst, src)
	}
}

func expandKey(key []byte, enc, dec []uint32) {
	if useAsm {
		rounds := 10
		switch len(key) {
		case 128 / 8:
			rounds = 10
		case 192 / 8:
			rounds = 12
		case 256 / 8:
			rounds = 14
		}
		expandKeyAsm(rounds, &key[0], &enc[0], &dec[0])
	} else {
		expandKeyGo(key, enc, dec)
	}
}