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PKCS7_encrypt.3ssl
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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_encrypt \- create a PKCS#7 envelopedData structure .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/pkcs7.h> \& \& PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher, int flags); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBPKCS7_encrypt()\fR creates and returns a PKCS#7 envelopedData structure. \fBcerts\fR is a list of recipient certificates. \fBin\fR is the content to be encrypted. \&\fBcipher\fR is the symmetric cipher to use. \fBflags\fR is an optional set of flags. .SH "NOTES" .IX Header "NOTES" Only \s-1RSA\s0 keys are supported in PKCS#7 and envelopedData so the recipient certificates supplied to this function must all contain \s-1RSA\s0 public keys, though they do not have to be signed using the \s-1RSA\s0 algorithm. .PP \&\fBEVP_des_ede3_cbc()\fR (triple \s-1DES\s0) is the algorithm of choice for S/MIME use because most clients will support it. .PP Some old \*(L"export grade\*(R" clients may only support weak encryption using 40 or 64 bit \s-1RC2.\s0 These can be used by passing \fBEVP_rc2_40_cbc()\fR and \fBEVP_rc2_64_cbc()\fR respectively. .PP The algorithm passed in the \fBcipher\fR parameter must support \s-1ASN1\s0 encoding of its parameters. .PP Many browsers implement a \*(L"sign and encrypt\*(R" option which is simply an S/MIME envelopedData containing an S/MIME signed message. This can be readily produced by storing the S/MIME signed message in a memory \s-1BIO\s0 and passing it to \&\fBPKCS7_encrypt()\fR. .PP The following flags can be passed in the \fBflags\fR parameter. .PP 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 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. If \fB\s-1PKCS7_BINARY\s0\fR is set then \&\fB\s-1PKCS7_TEXT\s0\fR is ignored. .PP If the \fB\s-1PKCS7_STREAM\s0\fR flag is set a partial \fB\s-1PKCS7\s0\fR structure is output suitable for streaming I/O: no data is read from the \s-1BIO\s0 \fBin\fR. .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. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBPKCS7_encrypt()\fR returns either a \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_decrypt\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBPKCS7_decrypt()\fR was added to OpenSSL 0.9.5 The \fB\s-1PKCS7_STREAM\s0\fR flag was first supported in OpenSSL 1.0.0.
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