Adding upstream version 1.18.10.upstream/1.18.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 95 insertions, 0 deletions

diff --git a/src/crypto/aes/cipher_s390x.go b/src/crypto/aes/cipher_s390x.go
new file mode 100644
index 0000000..65b6b2f
--- /dev/null
+++ b/src/crypto/aes/cipher_s390x.go
@@ -0,0 +1,95 @@
+// 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)
+}