libgo/go/crypto/aes/cbc_s390x.go

   1 // Copyright 2016 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // +build ignore
   6
   7 package aes
   8
   9 import (
  10         "crypto/cipher"
  11 )
  12
  13 // Assert that aesCipherAsm implements the cbcEncAble and cbcDecAble interfaces.
  14 var _ cbcEncAble = (*aesCipherAsm)(nil)
  15 var _ cbcDecAble = (*aesCipherAsm)(nil)
  16
  17 type cbc struct {
  18         b  *aesCipherAsm
  19         c  code
  20         iv [BlockSize]byte
  21 }
  22
  23 func (b *aesCipherAsm) NewCBCEncrypter(iv []byte) cipher.BlockMode {
  24         var c cbc
  25         c.b = b
  26         c.c = b.function
  27         copy(c.iv[:], iv)
  28         return &c
  29 }
  30
  31 func (b *aesCipherAsm) NewCBCDecrypter(iv []byte) cipher.BlockMode {
  32         var c cbc
  33         c.b = b
  34         c.c = b.function + 128 // decrypt function code is encrypt + 128
  35         copy(c.iv[:], iv)
  36         return &c
  37 }
  38
  39 func (x *cbc) BlockSize() int { return BlockSize }
  40
  41 // cryptBlocksChain invokes the cipher message with chaining (KMC) instruction
  42 // with the given function code. The length must be a multiple of BlockSize (16).
  43 //go:noescape
  44 func cryptBlocksChain(c code, iv, key, dst, src *byte, length int)
  45
  46 func (x *cbc) CryptBlocks(dst, src []byte) {
  47         if len(src)%BlockSize != 0 {
  48                 panic("crypto/cipher: input not full blocks")
  49         }
  50         if len(dst) < len(src) {
  51                 panic("crypto/cipher: output smaller than input")
  52         }
  53         if len(src) > 0 {
  54                 cryptBlocksChain(x.c, &x.iv[0], &x.b.key[0], &dst[0], &src[0], len(src))
  55         }
  56 }
  57
  58 func (x *cbc) SetIV(iv []byte) {
  59         if len(iv) != BlockSize {
  60                 panic("cipher: incorrect length IV")
  61         }
  62         copy(x.iv[:], iv)
  63 }