diff options
Diffstat (limited to 'secure/lib/libcrypto/man/BIO_f_cipher.3')
-rw-r--r-- | secure/lib/libcrypto/man/BIO_f_cipher.3 | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/BIO_f_cipher.3 b/secure/lib/libcrypto/man/BIO_f_cipher.3 new file mode 100644 index 0000000..cacd96d --- /dev/null +++ b/secure/lib/libcrypto/man/BIO_f_cipher.3 @@ -0,0 +1,203 @@ +.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.14 +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.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. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to +.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C' +.\" expand to `' in nroff, nothing in troff, for use with C<>. +.tr \(*W-|\(bv\*(Tr +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" If the F register is turned on, we'll generate index entries on stderr for +.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index +.\" entries marked with X<> in POD. Of course, you'll have to process the +.\" output yourself in some meaningful fashion. +.if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" For nroff, turn off justification. Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.hy 0 +.if n .na +.\" +.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). +.\" Fear. Run. Save yourself. 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 "BIO_f_cipher 3" +.TH BIO_f_cipher 3 "2005-02-24" "0.9.7d" "OpenSSL" +.SH "NAME" +BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx \- cipher BIO filter +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 2 +\& #include <openssl/bio.h> +\& #include <openssl/evp.h> +.Ve +.PP +.Vb 5 +\& BIO_METHOD * BIO_f_cipher(void); +\& void BIO_set_cipher(BIO *b,const EVP_CIPHER *cipher, +\& unsigned char *key, unsigned char *iv, int enc); +\& int BIO_get_cipher_status(BIO *b) +\& int BIO_get_cipher_ctx(BIO *b, EVP_CIPHER_CTX **pctx) +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fIBIO_f_cipher()\fR returns the cipher \s-1BIO\s0 method. This is a filter +\&\s-1BIO\s0 that encrypts any data written through it, and decrypts any data +read from it. It is a \s-1BIO\s0 wrapper for the cipher routines +\&\fIEVP_CipherInit()\fR, \fIEVP_CipherUpdate()\fR and \fIEVP_CipherFinal()\fR. +.PP +Cipher BIOs do not support \fIBIO_gets()\fR or \fIBIO_puts()\fR. +.PP +\&\fIBIO_flush()\fR on an encryption \s-1BIO\s0 that is being written through is +used to signal that no more data is to be encrypted: this is used +to flush and possibly pad the final block through the \s-1BIO\s0. +.PP +\&\fIBIO_set_cipher()\fR sets the cipher of \s-1BIO\s0 \fBb\fR to \fBcipher\fR using key \fBkey\fR +and \s-1IV\s0 \fBiv\fR. \fBenc\fR should be set to 1 for encryption and zero for +decryption. +.PP +When reading from an encryption \s-1BIO\s0 the final block is automatically +decrypted and checked when \s-1EOF\s0 is detected. \fIBIO_get_cipher_status()\fR +is a \fIBIO_ctrl()\fR macro which can be called to determine whether the +decryption operation was successful. +.PP +\&\fIBIO_get_cipher_ctx()\fR is a \fIBIO_ctrl()\fR macro which retrieves the internal +\&\s-1BIO\s0 cipher context. The retrieved context can be used in conjunction +with the standard cipher routines to set it up. This is useful when +\&\fIBIO_set_cipher()\fR is not flexible enough for the applications needs. +.SH "NOTES" +.IX Header "NOTES" +When encrypting \fIBIO_flush()\fR \fBmust\fR be called to flush the final block +through the \s-1BIO\s0. If it is not then the final block will fail a subsequent +decrypt. +.PP +When decrypting an error on the final block is signalled by a zero +return value from the read operation. A successful decrypt followed +by \s-1EOF\s0 will also return zero for the final read. \fIBIO_get_cipher_status()\fR +should be called to determine if the decrypt was successful. +.PP +As always, if \fIBIO_gets()\fR or \fIBIO_puts()\fR support is needed then it can +be achieved by preceding the cipher \s-1BIO\s0 with a buffering \s-1BIO\s0. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIBIO_f_cipher()\fR returns the cipher \s-1BIO\s0 method. +.PP +\&\fIBIO_set_cipher()\fR does not return a value. +.PP +\&\fIBIO_get_cipher_status()\fR returns 1 for a successful decrypt and 0 +for failure. +.PP +\&\fIBIO_get_cipher_ctx()\fR currently always returns 1. +.SH "EXAMPLES" +.IX Header "EXAMPLES" +\&\s-1TBA\s0 +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\s-1TBA\s0 |