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Diffstat (limited to 'secure/lib/libcrypto/man/man3/PKCS7_sign.3')
| -rw-r--r-- | secure/lib/libcrypto/man/man3/PKCS7_sign.3 | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/man3/PKCS7_sign.3 b/secure/lib/libcrypto/man/man3/PKCS7_sign.3 new file mode 100644 index 000000000000..68ff3757dc52 --- /dev/null +++ b/secure/lib/libcrypto/man/man3/PKCS7_sign.3 @@ -0,0 +1,252 @@ +.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.39) +.\" +.\" 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" +\&\fBPKCS7_sign()\fR creates and returns a PKCS#7 signedData structure. \fBsigncert\fR is +the certificate to sign with, \fBpkey\fR is the corresponding 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 authenticatedAttributes +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, 128\s0 bit \s-1RC2, 64\s0 bit \s-1RC2, DES\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_STREAM\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. +.PP +If the \fB\s-1PKCS7_PARTIAL\s0\fR flag is set a partial \fB\s-1PKCS7\s0\fR structure is output to +which additional signers and capabilities can be added before finalization. +.SH "NOTES" +.IX Header "NOTES" +If the flag \fB\s-1PKCS7_STREAM\s0\fR 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 +Several functions including \fBSMIME_write_PKCS7()\fR, \fBi2d_PKCS7_bio_stream()\fR, +\&\fBPEM_write_bio_PKCS7_stream()\fR finalize the structure. Alternatively finalization +can be performed by obtaining the streaming \s-1ASN1\s0 \fB\s-1BIO\s0\fR directly using +\&\fBBIO_new_PKCS7()\fR. +.PP +If a signer is specified it will use the default digest for the signing +algorithm. This is \fB\s-1SHA1\s0\fR for both \s-1RSA\s0 and \s-1DSA\s0 keys. +.PP +The \fBcerts\fR, \fBsigncert\fR and \fBpkey\fR parameters can all be +\&\fB\s-1NULL\s0\fR if the \fB\s-1PKCS7_PARTIAL\s0\fR flag is set. One or more signers can be added +using the function \fBPKCS7_sign_add_signer()\fR. \fBPKCS7_final()\fR must also be +called to finalize the structure if streaming is not enabled. Alternative +signing digests can also be specified using this method. +.PP +If \fBsigncert\fR and \fBpkey\fR are \s-1NULL\s0 then a certificates only +PKCS#7 structure is output. +.PP +In versions of OpenSSL before 1.0.0 the \fBsigncert\fR and \fBpkey\fR parameters must +\&\fB\s-1NOT\s0\fR be \s-1NULL.\s0 +.SH "BUGS" +.IX Header "BUGS" +Some advanced attributes such as counter signatures are not supported. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fBPKCS7_sign()\fR returns either a valid \s-1PKCS7\s0 structure or \s-1NULL\s0 if an error +occurred. The error can be obtained from \fBERR_get_error\fR\|(3). +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fBERR_get_error\fR\|(3), \fBPKCS7_verify\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +The \fB\s-1PKCS7_PARTIAL\s0\fR flag, and the ability for \fBcerts\fR, \fBsigncert\fR, +and \fBpkey\fR parameters to be \fB\s-1NULL\s0\fR were added in OpenSSL 1.0.0. +.PP +The \fB\s-1PKCS7_STREAM\s0\fR flag was added in OpenSSL 1.0.0. +.SH "COPYRIGHT" +.IX Header "COPYRIGHT" +Copyright 2002\-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>. |