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Diffstat (limited to 'usr/man/man3/blowfish.3')
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diff --git a/usr/man/man3/blowfish.3 b/usr/man/man3/blowfish.3 new file mode 100755 index 000000000..7394a303b --- /dev/null +++ b/usr/man/man3/blowfish.3 @@ -0,0 +1,242 @@ +.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28) +.\" +.\" 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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No user-serviceable parts. +. \" fudge factors for nroff and troff +.if n \{\ +. ds #H 0 +. ds #V .8m +. ds #F .3m +. ds #[ \f1 +. ds #] \fP +.\} +.if t \{\ +. ds #H ((1u-(\\\\n(.fu%2u))*.13m) +. ds #V .6m +. ds #F 0 +. ds #[ \& +. ds #] \& +.\} +. \" simple accents for nroff and troff +.if n \{\ +. ds ' \& +. ds ` \& +. ds ^ \& +. ds , \& +. ds ~ ~ +. ds / +.\} +.if t \{\ +. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" +. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' +. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' +. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' +. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' +. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' +.\} +. \" troff and (daisy-wheel) nroff accents +.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' +.ds 8 \h'\*(#H'\(*b\h'-\*(#H' +.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] +.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' +.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' +.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] +.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] +.ds ae a\h'-(\w'a'u*4/10)'e +.ds Ae A\h'-(\w'A'u*4/10)'E +. \" corrections for vroff +.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' +.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' +. \" for low resolution devices (crt and lpr) +.if \n(.H>23 .if \n(.V>19 \ +\{\ +. ds : e +. ds 8 ss +. ds o a +. ds d- d\h'-1'\(ga +. ds D- D\h'-1'\(hy +. ds th \o'bp' +. ds Th \o'LP' +. ds ae ae +. ds Ae AE +.\} +.rm #[ #] #H #V #F C +.\" ======================================================================== +.\" +.IX Title "blowfish 3" +.TH blowfish 3 "2014-06-05" "0.9.8za" "OpenSSL" +.\" For nroff, turn off justification. Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +blowfish, 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 the +blowfish functions directly. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIdes_modes\fR\|(7) +.SH "HISTORY" +.IX Header "HISTORY" +The Blowfish functions are available in all versions of SSLeay and OpenSSL. |