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Name	Size	Permission
aes_gcm.go	5.72 KB	-rw-r--r--
aes_test.go	11.3 KB	-rw-r--r--
asm_amd64.s	5.4 KB	-rw-r--r--
asm_arm64.s	6.86 KB	-rw-r--r--
asm_ppc64le.s	20.17 KB	-rw-r--r--
asm_s390x.s	4.38 KB	-rw-r--r--
block.go	6.5 KB	-rw-r--r--
cbc_s390x.go	1.57 KB	-rw-r--r--
cipher.go	1.85 KB	-rw-r--r--
cipher_asm.go	2.32 KB	-rw-r--r--
cipher_generic.go	740 B	-rw-r--r--
cipher_ppc64le.go	2.07 KB	-rw-r--r--
cipher_s390x.go	2.6 KB	-rw-r--r--
const.go	29.32 KB	-rw-r--r--
ctr_s390x.go	2.44 KB	-rw-r--r--
gcm_amd64.s	23.42 KB	-rw-r--r--
gcm_arm64.s	21.52 KB	-rw-r--r--
gcm_ppc64le.go	6.7 KB	-rw-r--r--
gcm_ppc64le.s	12.78 KB	-rw-r--r--
gcm_s390x.go	11.35 KB	-rw-r--r--
modes.go	1.15 KB	-rw-r--r--
modes_test.go	3.48 KB	-rw-r--r--

Code Editor : cipher_s390x.go

// 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"
	"crypto/internal/subtle"
	"internal/cpu"
)

type code int

// Function codes for the cipher message family of instructions.
const (
	aes128 code = 18
	aes192      = 19
	aes256      = 20
)

type aesCipherAsm struct {
	function code     // code for cipher message instruction
	key      []byte   // key (128, 192 or 256 bits)
	storage  [32]byte // array backing key slice
}

// cryptBlocks invokes the cipher message (KM) instruction with
// the given function code. This is equivalent to AES in ECB
// mode. The length must be a multiple of BlockSize (16).
//go:noescape
func cryptBlocks(c code, key, dst, src *byte, length int)

func newCipher(key []byte) (cipher.Block, error) {
	// The aesCipherAsm type implements the cbcEncAble, cbcDecAble,
	// ctrAble and gcmAble interfaces. We therefore need to check
	// for all the features required to implement these modes.
	// Keep in sync with crypto/tls/common.go.
	if !(cpu.S390X.HasAES && cpu.S390X.HasAESCBC && cpu.S390X.HasAESCTR && (cpu.S390X.HasGHASH || cpu.S390X.HasAESGCM)) {
		return newCipherGeneric(key)
	}

var function code
	switch len(key) {
	case 128 / 8:
		function = aes128
	case 192 / 8:
		function = aes192
	case 256 / 8:
		function = aes256
	default:
		return nil, KeySizeError(len(key))
	}

var c aesCipherAsm
	c.function = function
	c.key = c.storage[:len(key)]
	copy(c.key, key)
	return &c, nil
}

func (c *aesCipherAsm) BlockSize() int { return BlockSize }

func (c *aesCipherAsm) Encrypt(dst, src []byte) {
	if len(src) < BlockSize {
		panic("crypto/aes: input not full block")
	}
	if len(dst) < BlockSize {
		panic("crypto/aes: output not full block")
	}
	if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
		panic("crypto/aes: invalid buffer overlap")
	}
	cryptBlocks(c.function, &c.key[0], &dst[0], &src[0], BlockSize)
}

func (c *aesCipherAsm) Decrypt(dst, src []byte) {
	if len(src) < BlockSize {
		panic("crypto/aes: input not full block")
	}
	if len(dst) < BlockSize {
		panic("crypto/aes: output not full block")
	}
	if subtle.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
		panic("crypto/aes: invalid buffer overlap")
	}
	// The decrypt function code is equal to the function code + 128.
	cryptBlocks(c.function+128, &c.key[0], &dst[0], &src[0], BlockSize)
}

// expandKey is used by BenchmarkExpand. cipher message (KM) does not need key
// expansion so there is no assembly equivalent.
func expandKey(key []byte, enc, dec []uint32) {
	expandKeyGo(key, enc, dec)
}

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Code Editor : cipher_s390x.go