190 lines
6.3 KiB
Groff
190 lines
6.3 KiB
Groff
.\" $NetBSD: PKCS7_encrypt.3,v 1.3 2005/03/26 03:26:46 christos Exp $
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.\" ========================================================================
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.\"
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.IX Title "PKCS7_encrypt 3"
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.TH PKCS7_encrypt 3 "2003-07-24" "0.9.7f" "OpenSSL"
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.SH "NAME"
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PKCS7_encrypt \- create a PKCS#7 envelopedData structure
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\s-1PKCS7\s0 *PKCS7_encrypt(\s-1STACK_OF\s0(X509) *certs, \s-1BIO\s0 *in, const \s-1EVP_CIPHER\s0 *cipher, int flags);
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIPKCS7_encrypt()\fR creates and returns a PKCS#7 envelopedData structure. \fBcerts\fR
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is a list of recipient certificates. \fBin\fR is the content to be encrypted.
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\&\fBcipher\fR is the symmetric cipher to use. \fBflags\fR is an optional set of flags.
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.SH "NOTES"
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.IX Header "NOTES"
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Only \s-1RSA\s0 keys are supported in PKCS#7 and envelopedData so the recipient certificates
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supplied to this function must all contain \s-1RSA\s0 public keys, though they do not have to
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be signed using the \s-1RSA\s0 algorithm.
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.PP
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\&\fIEVP_des_ede3_cbc()\fR (triple \s-1DES\s0) is the algorithm of choice for S/MIME use because
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most clients will support it.
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.PP
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Some old \*(L"export grade\*(R" clients may only support weak encryption using 40 or 64 bit
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\&\s-1RC2\s0. These can be used by passing \fIEVP_rc2_40_cbc()\fR and \fIEVP_rc2_64_cbc()\fR respectively.
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.PP
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The algorithm passed in the \fBcipher\fR parameter must support \s-1ASN1\s0 encoding of its
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parameters.
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.PP
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Many browsers implement a \*(L"sign and encrypt\*(R" option which is simply an S/MIME
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envelopedData containing an S/MIME signed message. This can be readily produced
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by storing the S/MIME signed message in a memory \s-1BIO\s0 and passing it to
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\&\fIPKCS7_encrypt()\fR.
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.PP
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The following flags can be passed in the \fBflags\fR parameter.
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.PP
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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
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to the data.
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.PP
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Normally the supplied content is translated into \s-1MIME\s0 canonical format (as required
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by the S/MIME specifications) if \fB\s-1PKCS7_BINARY\s0\fR is set no translation occurs. This
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option should be used if the supplied data is in binary format otherwise the translation
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will corrupt it. If \fB\s-1PKCS7_BINARY\s0\fR is set then \fB\s-1PKCS7_TEXT\s0\fR is ignored.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIPKCS7_encrypt()\fR returns either a valid \s-1PKCS7\s0 structure or \s-1NULL\s0 if an error occurred.
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The error can be obtained from \fIERR_get_error\fR\|(3).
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.SH "BUGS"
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.IX Header "BUGS"
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The lack of single pass processing and need to hold all data in memory as
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mentioned in \fIPKCS7_sign()\fR also applies to \fIPKCS7_verify()\fR.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIERR_get_error\fR\|(3), \fIPKCS7_decrypt\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIPKCS7_decrypt()\fR was added to OpenSSL 0.9.5
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