1BF_ENCRYPT(3ossl) OpenSSL BF_ENCRYPT(3ossl)
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6 BF_set_key, BF_encrypt, BF_decrypt, BF_ecb_encrypt, BF_cbc_encrypt,
7 BF_cfb64_encrypt, BF_ofb64_encrypt, BF_options - Blowfish encryption
8
10 #include <openssl/blowfish.h>
11 The following functions have been deprecated since OpenSSL 3.0, and can
13 be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
14 version value, see openssl_user_macros(7):
15 void BF_set_key(BF_KEY *key, int len, const unsigned char *data);
17 void BF_ecb_encrypt(const unsigned char *in, unsigned char *out,
19 BF_KEY *key, int enc);
20 void BF_cbc_encrypt(const unsigned char *in, unsigned char *out,
21 long length, BF_KEY *schedule,
22 unsigned char *ivec, int enc);
23 void BF_cfb64_encrypt(const unsigned char *in, unsigned char *out,
24 long length, BF_KEY *schedule,
25 unsigned char *ivec, int *num, int enc);
26 void BF_ofb64_encrypt(const unsigned char *in, unsigned char *out,
27 long length, BF_KEY *schedule,
28 unsigned char *ivec, int *num);
29 const char *BF_options(void);
30 void BF_encrypt(BF_LONG *data, const BF_KEY *key);
32 void BF_decrypt(BF_LONG *data, const BF_KEY *key);
33
35 All of the functions described on this page are deprecated.
36 Applications should instead use EVP_EncryptInit_ex(3),
37 EVP_EncryptUpdate(3) and EVP_EncryptFinal_ex(3) or the equivalently
38 named decrypt functions.
39 This library implements the Blowfish cipher, which was invented and
41 described by Counterpane (see http://www.counterpane.com/blowfish.html
42 ).
43 Blowfish is a block cipher that operates on 64 bit (8 byte) blocks of
45 data. It uses a variable size key, but typically, 128 bit (16 byte)
46 keys are considered good for strong encryption. Blowfish can be used
47 in the same modes as DES (see des_modes(7)). Blowfish is currently one
48 of the faster block ciphers. It is quite a bit faster than DES, and
49 much faster than IDEA or RC2.
50 Blowfish consists of a key setup phase and the actual encryption or
52 decryption phase.
53 BF_set_key() sets up the BF_KEY key using the len bytes long key at
55 data.
56 BF_ecb_encrypt() is the basic Blowfish encryption and decryption
58 function. It encrypts or decrypts the first 64 bits of in using the
59 key key, putting the result in out. enc decides if encryption
60 (BF_ENCRYPT) or decryption (BF_DECRYPT) shall be performed. The vector
61 pointed at by in and out must be 64 bits in length, no less. If they
62 are larger, everything after the first 64 bits is ignored.
63 The mode functions BF_cbc_encrypt(), BF_cfb64_encrypt() and
65 BF_ofb64_encrypt() all operate on variable length data. They all take
66 an initialization vector ivec which needs to be passed along into the
67 next call of the same function for the same message. ivec may be
68 initialized with anything, but the recipient needs to know what it was
69 initialized with, or it won't be able to decrypt. Some programs and
70 protocols simplify this, like SSH, where ivec is simply initialized to
71 zero. BF_cbc_encrypt() operates on data that is a multiple of 8 bytes
72 long, while BF_cfb64_encrypt() and BF_ofb64_encrypt() are used to
73 encrypt a variable number of bytes (the amount does not have to be an
74 exact multiple of 8). The purpose of the latter two is to simulate
75 stream ciphers, and therefore, they need the parameter num, which is a
76 pointer to an integer where the current offset in ivec is stored
77 between calls. This integer must be initialized to zero when ivec is
78 initialized.
79 BF_cbc_encrypt() is the Cipher Block Chaining function for Blowfish.
81 It encrypts or decrypts the 64 bits chunks of in using the key
82 schedule, putting the result in out. enc decides if encryption
83 (BF_ENCRYPT) or decryption (BF_DECRYPT) shall be performed. ivec must
84 point at an 8 byte long initialization vector.
85 BF_cfb64_encrypt() is the CFB mode for Blowfish with 64 bit feedback.
87 It encrypts or decrypts the bytes in in using the key schedule, putting
88 the result in out. enc decides if encryption (BF_ENCRYPT) or
89 decryption (BF_DECRYPT) shall be performed. ivec must point at an 8
90 byte long initialization vector. num must point at an integer which
91 must be initially zero.
92 BF_ofb64_encrypt() is the OFB mode for Blowfish with 64 bit feedback.
94 It uses the same parameters as BF_cfb64_encrypt(), which must be
95 initialized the same way.
96 BF_encrypt() and BF_decrypt() are the lowest level functions for
98 Blowfish encryption. They encrypt/decrypt the first 64 bits of the
99 vector pointed by data, using the key key. These functions should not
100 be used unless you implement 'modes' of Blowfish. The alternative is
101 to use BF_ecb_encrypt(). If you still want to use these functions, you
102 should be aware that they take each 32-bit chunk in host-byte order,
103 which is little-endian on little-endian platforms and big-endian on
104 big-endian ones.
105
107 None of the functions presented here return any value.
108
110 Applications should use the higher level functions EVP_EncryptInit(3)
111 etc. instead of calling these functions directly.
112
114 EVP_EncryptInit(3), des_modes(7)
115
117 All of these functions were deprecated in OpenSSL 3.0.
118
120 Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
121 Licensed under the Apache License 2.0 (the "License"). You may not use
123 this file except in compliance with the License. You can obtain a copy
124 in the file LICENSE in the source distribution or at
125 <https://www.openssl.org/source/license.html>.
1263.1.1 2023-08-31 BF_ENCRYPT(3ossl)