diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/blowfish/cipher.go')
-rw-r--r-- | vendor/golang.org/x/crypto/blowfish/cipher.go | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/vendor/golang.org/x/crypto/blowfish/cipher.go b/vendor/golang.org/x/crypto/blowfish/cipher.go new file mode 100644 index 0000000..a73954f --- /dev/null +++ b/vendor/golang.org/x/crypto/blowfish/cipher.go | |||
@@ -0,0 +1,91 @@ | |||
1 | // Copyright 2010 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 | // Package blowfish implements Bruce Schneier's Blowfish encryption algorithm. | ||
6 | package blowfish // import "golang.org/x/crypto/blowfish" | ||
7 | |||
8 | // The code is a port of Bruce Schneier's C implementation. | ||
9 | // See http://www.schneier.com/blowfish.html. | ||
10 | |||
11 | import "strconv" | ||
12 | |||
13 | // The Blowfish block size in bytes. | ||
14 | const BlockSize = 8 | ||
15 | |||
16 | // A Cipher is an instance of Blowfish encryption using a particular key. | ||
17 | type Cipher struct { | ||
18 | p [18]uint32 | ||
19 | s0, s1, s2, s3 [256]uint32 | ||
20 | } | ||
21 | |||
22 | type KeySizeError int | ||
23 | |||
24 | func (k KeySizeError) Error() string { | ||
25 | return "crypto/blowfish: invalid key size " + strconv.Itoa(int(k)) | ||
26 | } | ||
27 | |||
28 | // NewCipher creates and returns a Cipher. | ||
29 | // The key argument should be the Blowfish key, from 1 to 56 bytes. | ||
30 | func NewCipher(key []byte) (*Cipher, error) { | ||
31 | var result Cipher | ||
32 | if k := len(key); k < 1 || k > 56 { | ||
33 | return nil, KeySizeError(k) | ||
34 | } | ||
35 | initCipher(&result) | ||
36 | ExpandKey(key, &result) | ||
37 | return &result, nil | ||
38 | } | ||
39 | |||
40 | // NewSaltedCipher creates a returns a Cipher that folds a salt into its key | ||
41 | // schedule. For most purposes, NewCipher, instead of NewSaltedCipher, is | ||
42 | // sufficient and desirable. For bcrypt compatibility, the key can be over 56 | ||
43 | // bytes. | ||
44 | func NewSaltedCipher(key, salt []byte) (*Cipher, error) { | ||
45 | if len(salt) == 0 { | ||
46 | return NewCipher(key) | ||
47 | } | ||
48 | var result Cipher | ||
49 | if k := len(key); k < 1 { | ||
50 | return nil, KeySizeError(k) | ||
51 | } | ||
52 | initCipher(&result) | ||
53 | expandKeyWithSalt(key, salt, &result) | ||
54 | return &result, nil | ||
55 | } | ||
56 | |||
57 | // BlockSize returns the Blowfish block size, 8 bytes. | ||
58 | // It is necessary to satisfy the Block interface in the | ||
59 | // package "crypto/cipher". | ||
60 | func (c *Cipher) BlockSize() int { return BlockSize } | ||
61 | |||
62 | // Encrypt encrypts the 8-byte buffer src using the key k | ||
63 | // and stores the result in dst. | ||
64 | // Note that for amounts of data larger than a block, | ||
65 | // it is not safe to just call Encrypt on successive blocks; | ||
66 | // instead, use an encryption mode like CBC (see crypto/cipher/cbc.go). | ||
67 | func (c *Cipher) Encrypt(dst, src []byte) { | ||
68 | l := uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3]) | ||
69 | r := uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7]) | ||
70 | l, r = encryptBlock(l, r, c) | ||
71 | dst[0], dst[1], dst[2], dst[3] = byte(l>>24), byte(l>>16), byte(l>>8), byte(l) | ||
72 | dst[4], dst[5], dst[6], dst[7] = byte(r>>24), byte(r>>16), byte(r>>8), byte(r) | ||
73 | } | ||
74 | |||
75 | // Decrypt decrypts the 8-byte buffer src using the key k | ||
76 | // and stores the result in dst. | ||
77 | func (c *Cipher) Decrypt(dst, src []byte) { | ||
78 | l := uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3]) | ||
79 | r := uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7]) | ||
80 | l, r = decryptBlock(l, r, c) | ||
81 | dst[0], dst[1], dst[2], dst[3] = byte(l>>24), byte(l>>16), byte(l>>8), byte(l) | ||
82 | dst[4], dst[5], dst[6], dst[7] = byte(r>>24), byte(r>>16), byte(r>>8), byte(r) | ||
83 | } | ||
84 | |||
85 | func initCipher(c *Cipher) { | ||
86 | copy(c.p[0:], p[0:]) | ||
87 | copy(c.s0[0:], s0[0:]) | ||
88 | copy(c.s1[0:], s1[0:]) | ||
89 | copy(c.s2[0:], s2[0:]) | ||
90 | copy(c.s3[0:], s3[0:]) | ||
91 | } | ||