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RedHat 9 (Linux i386) - man page for smime_read_pkcs7 (redhat section 3)

SMIME_read_PKCS7(3)						      OpenSSL						       SMIME_read_PKCS7(3)

NAME
SMIME_read_PKCS7 - parse S/MIME message.
SYNOPSIS
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 0.9.7a 2002-10-09 SMIME_read_PKCS7(3)

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