SMIME_read_PKCS7 (3)

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NAME

SMIME_read_PKCS7 - parse S/MIME message.

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

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

.

The parsed PKCS#7 structure is returned or

if an error occurred.

NOTES

If *bcont is not then the message is clear text signed. *bcont can then be passed to PKCS7_verify() with the flag set.

Otherwise the type of the returned structure can be determined using PKCS7_type().

To support future functionality if bcont is not

*bcont should be initialized to . For example:

 BIO *cont = NULL;
 PKCS7 *p7;

 p7 = SMIME_read_PKCS7(in, &cont);

BUGS

The 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

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

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 structure or 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