1 files changed, 82 insertions, 0 deletions
diff --git a/src/crypto/aes/cipher.go b/src/crypto/aes/cipher.go
new file mode 100644
index 0000000..db0ee38
--- /dev/null
+++ b/src/crypto/aes/cipher.go
@@ -0,0 +1,82 @@
+// Copyright 2009 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/boring"
+	"crypto/internal/subtle"
+	"strconv"
+)
+
+// The AES block size in bytes.
+const BlockSize = 16
+
+// A cipher is an instance of AES encryption using a particular key.
+type aesCipher struct {
+	enc []uint32
+	dec []uint32
+}
+
+type KeySizeError int
+
+func (k KeySizeError) Error() string {
+	return "crypto/aes: invalid key size " + strconv.Itoa(int(k))
+}
+
+// NewCipher creates and returns a new cipher.Block.
+// The key argument should be the AES key,
+// either 16, 24, or 32 bytes to select
+// AES-128, AES-192, or AES-256.
+func NewCipher(key []byte) (cipher.Block, error) {
+	k := len(key)
+	switch k {
+	default:
+		return nil, KeySizeError(k)
+	case 16, 24, 32:
+		break
+	}
+	if boring.Enabled {
+		return boring.NewAESCipher(key)
+	}
+	return newCipher(key)
+}
+
+// newCipherGeneric creates and returns a new cipher.Block
+// implemented in pure Go.
+func newCipherGeneric(key []byte) (cipher.Block, error) {
+	n := len(key) + 28
+	c := aesCipher{make([]uint32, n), make([]uint32, n)}
+	expandKeyGo(key, c.enc, c.dec)
+	return &c, nil
+}
+
+func (c *aesCipher) BlockSize() int { return BlockSize }
+
+func (c *aesCipher) 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")
+	}
+	encryptBlockGo(c.enc, dst, src)
+}
+
+func (c *aesCipher) 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")
+	}
+	decryptBlockGo(c.dec, dst, src)
+}