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Source file src/crypto/aes/cbc_s390x.go

Documentation: crypto/aes

  // Copyright 2016 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.
  
  package aes
  
  import (
  	"crypto/cipher"
  )
  
  // Assert that aesCipherAsm implements the cbcEncAble and cbcDecAble interfaces.
  var _ cbcEncAble = (*aesCipherAsm)(nil)
  var _ cbcDecAble = (*aesCipherAsm)(nil)
  
  type cbc struct {
  	b  *aesCipherAsm
  	c  code
  	iv [BlockSize]byte
  }
  
  func (b *aesCipherAsm) NewCBCEncrypter(iv []byte) cipher.BlockMode {
  	var c cbc
  	c.b = b
  	c.c = b.function
  	copy(c.iv[:], iv)
  	return &c
  }
  
  func (b *aesCipherAsm) NewCBCDecrypter(iv []byte) cipher.BlockMode {
  	var c cbc
  	c.b = b
  	c.c = b.function + 128 // decrypt function code is encrypt + 128
  	copy(c.iv[:], iv)
  	return &c
  }
  
  func (x *cbc) BlockSize() int { return BlockSize }
  
  // cryptBlocksChain invokes the cipher message with chaining (KMC) instruction
  // with the given function code. The length must be a multiple of BlockSize (16).
  //go:noescape
  func cryptBlocksChain(c code, iv, key, dst, src *byte, length int)
  
  func (x *cbc) CryptBlocks(dst, src []byte) {
  	if len(src)%BlockSize != 0 {
  		panic("crypto/cipher: input not full blocks")
  	}
  	if len(dst) < len(src) {
  		panic("crypto/cipher: output smaller than input")
  	}
  	if len(src) > 0 {
  		cryptBlocksChain(x.c, &x.iv[0], &x.b.key[0], &dst[0], &src[0], len(src))
  	}
  }
  
  func (x *cbc) SetIV(iv []byte) {
  	if len(iv) != BlockSize {
  		panic("cipher: incorrect length IV")
  	}
  	copy(x.iv[:], iv)
  }
  

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