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Diffstat (limited to 'secure/lib/libcrypto/man/PKCS7_sign.3')
-rw-r--r-- | secure/lib/libcrypto/man/PKCS7_sign.3 | 222 |
1 files changed, 222 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..e9c4021 --- /dev/null +++ b/secure/lib/libcrypto/man/PKCS7_sign.3 @@ -0,0 +1,222 @@ +.\" Automatically generated by Pod::Man 2.22 (Pod::Simple 3.07) +.\" +.\" 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" +PKCS7_sign \- create a PKCS#7 signedData structure +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/pkcs7.h> +\& +\& PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs, BIO *data, int flags); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fIPKCS7_sign()\fR creates and returns a PKCS#7 signedData structure. \fBsigncert\fR +is the certificate to sign with, \fBpkey\fR is the corresponsding private key. +\&\fBcerts\fR is an optional additional set of certificates to include in the +PKCS#7 structure (for example any intermediate CAs in the chain). +.PP +The data to be signed is read from \s-1BIO\s0 \fBdata\fR. +.PP +\&\fBflags\fR is an optional set of flags. +.SH "NOTES" +.IX Header "NOTES" +Any of the following flags (ored together) can be passed in the \fBflags\fR parameter. +.PP +Many S/MIME clients expect the signed content to include valid \s-1MIME\s0 headers. 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. +.PP +If the flags \fB\s-1PKCS7_PARTSIGN\s0\fR is set then the returned \fB\s-1PKCS7\s0\fR structure +is just initialized ready to perform the signing operation. The signing +is however \fBnot\fR performed and the data to be signed is not read from +the \fBdata\fR parameter. Signing is deferred until after the data has been +written. In this way data can be signed in a single pass. Currently the +flag \fB\s-1PKCS7_DETACHED\s0\fR \fBmust\fR also be set. +.SH "NOTES" +.IX Header "NOTES" +Currently the flag \fB\s-1PKCS7_PARTSIGN\s0\fR is only supported for detached +data. If this flag is set the returned \fB\s-1PKCS7\s0\fR structure is \fBnot\fR +complete and outputting its contents via a function that does not +properly finalize the \fB\s-1PKCS7\s0\fR structure will give unpredictable +results. +.PP +At present only the \fISMIME_write_PKCS7()\fR function properly finalizes the +structure. +.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. +.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" +\&\fIERR_get_error\fR\|(3), \fIPKCS7_verify\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIPKCS7_sign()\fR was added to OpenSSL 0.9.5 +.PP +The \fB\s-1PKCS7_PARTSIGN\s0\fR flag was added in OpenSSL 0.9.8 |