SMIME_read_PKCS7.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SMIME_read_PKCS7 \- parse S/MIME message .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/pkcs7.h> \& \& PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSMIME_read_PKCS7()\fR parses a message in S/MIME format. .PP \&\fBin\fR is a \s-1BIO\s0 to read the message from. .PP If cleartext signing is used then the content is saved in a memory bio which is written to \fB*bcont\fR, otherwise \&\fB*bcont\fR is set to \fB\s-1NULL\s0\fR. .PP The parsed PKCS#7 structure is returned or \fB\s-1NULL\s0\fR if an error occurred. .SH "NOTES" .IX Header "NOTES" If \fB*bcont\fR is not \fB\s-1NULL\s0\fR then the message is clear text signed. \fB*bcont\fR can then be passed to \fBPKCS7_verify()\fR with the \fB\s-1PKCS7_DETACHED\s0\fR flag set. .PP Otherwise the type of the returned structure can be determined using \fBPKCS7_type_is_enveloped()\fR, etc. .PP To support future functionality if \fBbcont\fR is not \fB\s-1NULL\s0\fR \&\fB*bcont\fR should be initialized to \fB\s-1NULL\s0\fR. For example: .PP .Vb 2 \& BIO *cont = NULL; \& PKCS7 *p7; \& \& p7 = SMIME_read_PKCS7(in, &cont); .Ve .SH "BUGS" .IX Header "BUGS" The \s-1MIME\s0 parser used by \fBSMIME_read_PKCS7()\fR is somewhat primitive. While it will handle most S/MIME messages more complex compound formats may not work. .PP The parser assumes that the \s-1PKCS7\s0 structure is always base64 encoded and will not handle the case where it is in binary format or uses quoted printable format. .PP The use of a memory \s-1BIO\s0 to hold the signed content limits the size of message which can be processed due to memory restraints: a streaming single pass option should be available. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBSMIME_read_PKCS7()\fR returns a valid \fB\s-1PKCS7\s0\fR structure or \fB\s-1NULL\s0\fR 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), \&\fBSMIME_read_PKCS7\fR\|(3), \fBPKCS7_sign\fR\|(3), \&\fBPKCS7_verify\fR\|(3), \fBPKCS7_encrypt\fR\|(3) \&\fBPKCS7_decrypt\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2002\-2018 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>.
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