NAME
SMIME_read_PKCS7 - parse S/MIME message.
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/pkcs7.h>
PKCS7 *SMIME_read_PKCS7(BIO *in, BIO **bcont);
DESCRIPTION
SMIME_read_PKCS7() parses a message in S/MIME format.
in is a BIO 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
*bcont is set to
NULL.
The parsed PKCS#7 structure is returned or
NULL if an error occurred.
NOTES
If
*bcont is not
NULL then the message is clear text signed.
*bcont can then be passed to
PKCS7_verify() with the
PKCS7_DETACHED flag set.
Otherwise the type of the returned structure can be determined using
PKCS7_type().
To support future functionality if
bcont is not
NULL *bcont
should be initialized to
NULL. For example:
BIO *cont = NULL;
PKCS7 *p7;
p7 = SMIME_read_PKCS7(in, &cont);
BUGS
The MIME 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 PKCS7 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 BIO 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.
RETURN VALUES
SMIME_read_PKCS7() returns a valid
PKCS7 structure or
NULL
is an error occurred. The error can be obtained from
ERR_get_error(3).
SEE ALSO
ERR_get_error(3),
PKCS7_type(3)
SMIME_read_PKCS7(3),
PKCS7_sign(3),
PKCS7_verify(3),
PKCS7_encrypt(3)
PKCS7_decrypt(3)
HISTORY
SMIME_read_PKCS7() was added to OpenSSL 0.9.5