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Diffstat (limited to 'secure/lib/libcrypto/man/PKCS7_sign.3')
-rw-r--r-- | secure/lib/libcrypto/man/PKCS7_sign.3 | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/PKCS7_sign.3 b/secure/lib/libcrypto/man/PKCS7_sign.3 new file mode 100644 index 0000000..0ada49f --- /dev/null +++ b/secure/lib/libcrypto/man/PKCS7_sign.3 @@ -0,0 +1,215 @@ +.\" Automatically generated by Pod::Man version 1.15 +.\" Mon Jan 13 19:28:20 2003 +.\" +.\" 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 Ip \" List item +.br +.ie \\n(.$>=3 .ne \\$3 +.el .ne 3 +.IP "\\$1" \\$2 +.. +.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. 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If +the \fB\s-1PKCS7_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are prepended +to the data. +.PP +If \fB\s-1PKCS7_NOCERTS\s0\fR is set the signer's certificate will not be included in the +\&\s-1PKCS7\s0 structure, the signer's certificate must still be supplied in the \fBsigncert\fR +parameter though. This can reduce the size of the signature if the signers certificate +can be obtained by other means: for example a previously signed message. +.PP +The data being signed is included in the \s-1PKCS7\s0 structure, unless \fB\s-1PKCS7_DETACHED\s0\fR +is set in which case it is omitted. This is used for \s-1PKCS7\s0 detached signatures +which are used in S/MIME plaintext signed messages for example. +.PP +Normally the supplied content is translated into \s-1MIME\s0 canonical format (as required +by the S/MIME specifications) if \fB\s-1PKCS7_BINARY\s0\fR is set no translation occurs. This +option should be used if the supplied data is in binary format otherwise the translation +will corrupt it. +.PP +The signedData structure includes several PKCS#7 autenticatedAttributes including +the signing time, the PKCS#7 content type and the supported list of ciphers in +an SMIMECapabilities attribute. If \fB\s-1PKCS7_NOATTR\s0\fR is set then no authenticatedAttributes +will be used. If \fB\s-1PKCS7_NOSMIMECAP\s0\fR is set then just the SMIMECapabilities are +omitted. +.PP +If present the SMIMECapabilities attribute indicates support for the following +algorithms: triple \s-1DES\s0, 128 bit \s-1RC2\s0, 64 bit \s-1RC2\s0, \s-1DES\s0 and 40 bit \s-1RC2\s0. If any +of these algorithms is disabled then it will not be included. +.SH "BUGS" +.IX Header "BUGS" +\&\fIPKCS7_sign()\fR is somewhat limited. It does not support multiple signers, some +advanced attributes such as counter signatures are not supported. +.PP +The \s-1SHA1\s0 digest algorithm is currently always used. +.PP +When the signed data is not detached it will be stored in memory within the +\&\fB\s-1PKCS7\s0\fR structure. This effectively limits the size of messages which can be +signed due to memory restraints. There should be a way to sign data without +having to hold it all in memory, this would however require fairly major +revisions of the OpenSSL \s-1ASN1\s0 code. +.PP +Clear text signing does not store the content in memory but the way \fIPKCS7_sign()\fR +operates means that two passes of the data must typically be made: one to compute +the signatures and a second to output the data along with the signature. There +should be a way to process the data with only a single pass. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIPKCS7_sign()\fR returns either a valid \s-1PKCS7\s0 structure or \s-1NULL\s0 if an error occurred. +The error can be obtained from \fIERR_get_error\fR\|(3). +.SH "SEE ALSO" +.IX Header "SEE ALSO" +ERR_get_error(3), PKCS7_verify(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIPKCS7_sign()\fR was added to OpenSSL 0.9.5 |