OpenGrok

$NetBSD: SMIME_read_PKCS7.3,v 1.1.1.2 2023/04/18 14:19:14 christos Exp $

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Title "SMIME_read_PKCS7 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
.nh SMIME_read_PKCS7 - parse S/MIME message libcrypto, -lcrypto Header "SYNOPSIS" .Vb 1 #include <openssl/pkcs7.h> \& PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont); .Ve Header "DESCRIPTION" \fBSMIME_read_PKCS7() parses a message in S/MIME format.

\fBin is a \s-1BIO\s0 to read the message from.

If cleartext signing is used then the content is saved in a memory bio which is written to *bcont, otherwise \fB*bcont is set to \s-1NULL\s0.

The parsed PKCS#7 structure is returned or \s-1NULL\s0 if an error occurred.

Header "NOTES" If *bcont is not \s-1NULL\s0 then the message is clear text signed. *bcont can then be passed to PKCS7_verify() with the \s-1PKCS7_DETACHED\s0 flag set.

Otherwise the type of the returned structure can be determined using PKCS7_type_is_enveloped(), etc.

To support future functionality if bcont is not \s-1NULL\s0 \fB*bcont should be initialized to \s-1NULL\s0. For example:

.Vb 2 BIO *cont = NULL; PKCS7 *p7; \& p7 = SMIME_read_PKCS7(in, &cont); .Ve

Header "BUGS" The \s-1MIME\s0 parser used by SMIME_read_PKCS7() is somewhat primitive. While it will handle most S/MIME messages more complex compound formats may not work.

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.

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.

Header "RETURN VALUES" \fBSMIME_read_PKCS7() returns a valid \s-1PKCS7\s0 structure or \s-1NULL\s0 if an error occurred. The error can be obtained from ERR_get_error\|(3). Header "SEE ALSO" \fBERR_get_error\|(3), \fBSMIME_read_PKCS7\|(3), PKCS7_sign\|(3), \fBPKCS7_verify\|(3), PKCS7_encrypt\|(3) \fBPKCS7_decrypt\|(3) Header "COPYRIGHT" Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.

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>.

Indexes created Mon Apr 27 00:23:16 UTC 2026