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Diffstat (limited to 'secure/lib/libcrypto/man/BF_encrypt.3')
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diff --git a/secure/lib/libcrypto/man/BF_encrypt.3 b/secure/lib/libcrypto/man/BF_encrypt.3 new file mode 100644 index 000000000000..ac2d3421a013 --- /dev/null +++ b/secure/lib/libcrypto/man/BF_encrypt.3 @@ -0,0 +1,245 @@ +.\" Automatically generated by Pod::Man 4.09 (Pod::Simple 3.35) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +BF_set_key, BF_encrypt, BF_decrypt, BF_ecb_encrypt, BF_cbc_encrypt, BF_cfb64_encrypt, BF_ofb64_encrypt, BF_options \- Blowfish encryption +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/blowfish.h> +\& +\& void BF_set_key(BF_KEY *key, int len, const unsigned char *data); +\& +\& void BF_ecb_encrypt(const unsigned char *in, unsigned char *out, +\& BF_KEY *key, int enc); +\& void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, +\& long length, BF_KEY *schedule, +\& unsigned char *ivec, int enc); +\& void BF_cfb64_encrypt(const unsigned char *in, unsigned char *out, +\& long length, BF_KEY *schedule, +\& unsigned char *ivec, int *num, int enc); +\& void BF_ofb64_encrypt(const unsigned char *in, unsigned char *out, +\& long length, BF_KEY *schedule, +\& unsigned char *ivec, int *num); +\& const char *BF_options(void); +\& +\& void BF_encrypt(BF_LONG *data, const BF_KEY *key); +\& void BF_decrypt(BF_LONG *data, const BF_KEY *key); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +This library implements the Blowfish cipher, which was invented and described +by Counterpane (see http://www.counterpane.com/blowfish.html ). +.PP +Blowfish is a block cipher that operates on 64 bit (8 byte) blocks of data. +It uses a variable size key, but typically, 128 bit (16 byte) keys are +considered good for strong encryption. Blowfish can be used in the same +modes as \s-1DES\s0 (see \fIdes_modes\fR\|(7)). Blowfish is currently one +of the faster block ciphers. It is quite a bit faster than \s-1DES,\s0 and much +faster than \s-1IDEA\s0 or \s-1RC2.\s0 +.PP +Blowfish consists of a key setup phase and the actual encryption or decryption +phase. +.PP +\&\fIBF_set_key()\fR sets up the \fB\s-1BF_KEY\s0\fR \fBkey\fR using the \fBlen\fR bytes long key +at \fBdata\fR. +.PP +\&\fIBF_ecb_encrypt()\fR is the basic Blowfish encryption and decryption function. +It encrypts or decrypts the first 64 bits of \fBin\fR using the key \fBkey\fR, +putting the result in \fBout\fR. \fBenc\fR decides if encryption (\fB\s-1BF_ENCRYPT\s0\fR) +or decryption (\fB\s-1BF_DECRYPT\s0\fR) shall be performed. The vector pointed at by +\&\fBin\fR and \fBout\fR must be 64 bits in length, no less. If they are larger, +everything after the first 64 bits is ignored. +.PP +The mode functions \fIBF_cbc_encrypt()\fR, \fIBF_cfb64_encrypt()\fR and \fIBF_ofb64_encrypt()\fR +all operate on variable length data. They all take an initialization vector +\&\fBivec\fR which needs to be passed along into the next call of the same function +for the same message. \fBivec\fR may be initialized with anything, but the +recipient needs to know what it was initialized with, or it won't be able +to decrypt. Some programs and protocols simplify this, like \s-1SSH,\s0 where +\&\fBivec\fR is simply initialized to zero. +\&\fIBF_cbc_encrypt()\fR operates on data that is a multiple of 8 bytes long, while +\&\fIBF_cfb64_encrypt()\fR and \fIBF_ofb64_encrypt()\fR are used to encrypt an variable +number of bytes (the amount does not have to be an exact multiple of 8). The +purpose of the latter two is to simulate stream ciphers, and therefore, they +need the parameter \fBnum\fR, which is a pointer to an integer where the current +offset in \fBivec\fR is stored between calls. This integer must be initialized +to zero when \fBivec\fR is initialized. +.PP +\&\fIBF_cbc_encrypt()\fR is the Cipher Block Chaining function for Blowfish. It +encrypts or decrypts the 64 bits chunks of \fBin\fR using the key \fBschedule\fR, +putting the result in \fBout\fR. \fBenc\fR decides if encryption (\s-1BF_ENCRYPT\s0) or +decryption (\s-1BF_DECRYPT\s0) shall be performed. \fBivec\fR must point at an 8 byte +long initialization vector. +.PP +\&\fIBF_cfb64_encrypt()\fR is the \s-1CFB\s0 mode for Blowfish with 64 bit feedback. +It encrypts or decrypts the bytes in \fBin\fR using the key \fBschedule\fR, +putting the result in \fBout\fR. \fBenc\fR decides if encryption (\fB\s-1BF_ENCRYPT\s0\fR) +or decryption (\fB\s-1BF_DECRYPT\s0\fR) shall be performed. \fBivec\fR must point at an +8 byte long initialization vector. \fBnum\fR must point at an integer which must +be initially zero. +.PP +\&\fIBF_ofb64_encrypt()\fR is the \s-1OFB\s0 mode for Blowfish with 64 bit feedback. +It uses the same parameters as \fIBF_cfb64_encrypt()\fR, which must be initialized +the same way. +.PP +\&\fIBF_encrypt()\fR and \fIBF_decrypt()\fR are the lowest level functions for Blowfish +encryption. They encrypt/decrypt the first 64 bits of the vector pointed by +\&\fBdata\fR, using the key \fBkey\fR. These functions should not be used unless you +implement 'modes' of Blowfish. The alternative is to use \fIBF_ecb_encrypt()\fR. +If you still want to use these functions, you should be aware that they take +each 32\-bit chunk in host-byte order, which is little-endian on little-endian +platforms and big-endian on big-endian ones. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +None of the functions presented here return any value. +.SH "NOTE" +.IX Header "NOTE" +Applications should use the higher level functions +\&\fIEVP_EncryptInit\fR\|(3) etc. instead of calling these +functions directly. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIEVP_EncryptInit\fR\|(3), +\&\fIdes_modes\fR\|(7) +.SH "COPYRIGHT" +.IX Header "COPYRIGHT" +Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved. +.PP +Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use +this file except in compliance with the License. You can obtain a copy +in the file \s-1LICENSE\s0 in the source distribution or at +<https://www.openssl.org/source/license.html>. |