202 lines
6.0 KiB
Groff
202 lines
6.0 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "SMIME_read_PKCS7 3"
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.TH SMIME_read_PKCS7 3 "2017-05-25" "1.0.2l" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SMIME_read_PKCS7 \- parse S/MIME message.
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/pkcs7.h>
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\&
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\& PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISMIME_read_PKCS7()\fR parses a message in S/MIME format.
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.PP
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\&\fBin\fR is a \s-1BIO\s0 to read the message from.
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.PP
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If cleartext signing is used then the content is saved in
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a memory bio which is written to \fB*bcont\fR, otherwise
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\&\fB*bcont\fR is set to \fB\s-1NULL\s0\fR.
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.PP
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The parsed PKCS#7 structure is returned or \fB\s-1NULL\s0\fR if an
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error occurred.
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.SH "NOTES"
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.IX Header "NOTES"
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If \fB*bcont\fR is not \fB\s-1NULL\s0\fR then the message is clear text
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signed. \fB*bcont\fR can then be passed to \fIPKCS7_verify()\fR with
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the \fB\s-1PKCS7_DETACHED\s0\fR flag set.
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.PP
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Otherwise the type of the returned structure can be determined
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using \fIPKCS7_type()\fR.
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.PP
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To support future functionality if \fBbcont\fR is not \fB\s-1NULL\s0\fR
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\&\fB*bcont\fR should be initialized to \fB\s-1NULL\s0\fR. For example:
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.PP
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.Vb 2
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\& BIO *cont = NULL;
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\& PKCS7 *p7;
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\&
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\& p7 = SMIME_read_PKCS7(in, &cont);
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.Ve
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.SH "BUGS"
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.IX Header "BUGS"
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The \s-1MIME\s0 parser used by \fISMIME_read_PKCS7()\fR is somewhat primitive.
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While it will handle most S/MIME messages more complex compound
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formats may not work.
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.PP
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The parser assumes that the \s-1PKCS7\s0 structure is always base64
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encoded and will not handle the case where it is in binary format
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or uses quoted printable format.
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.PP
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The use of a memory \s-1BIO\s0 to hold the signed content limits the size
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of message which can be processed due to memory restraints: a
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streaming single pass option should be available.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISMIME_read_PKCS7()\fR returns a valid \fB\s-1PKCS7\s0\fR structure or \fB\s-1NULL\s0\fR
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is an error occurred. The error can be obtained from \fIERR_get_error\fR\|(3).
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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_type\fR\|(3)
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\&\fISMIME_read_PKCS7\fR\|(3), \fIPKCS7_sign\fR\|(3),
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\&\fIPKCS7_verify\fR\|(3), \fIPKCS7_encrypt\fR\|(3)
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\&\fIPKCS7_decrypt\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fISMIME_read_PKCS7()\fR was added to OpenSSL 0.9.5
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