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SMIME_write_PKCS7(3)                               OpenSSL                              SMIME_write_PKCS7(3)



NAME
       SMIME_write_PKCS7 - convert PKCS#7 structure to S/MIME format.

SYNOPSIS
       int SMIME_write_PKCS7(BIO *out, PKCS7 *p7, BIO *data, int flags);

DESCRIPTION
       SMIME_write_PKCS7() adds the appropriate MIME headers to a PKCS#7 structure to produce an S/MIME
       message.

       out is the BIO to write the data to. p7 is the appropriate PKCS7 structure. If cleartext signing
       (multipart/signed) is being used then the signed data must be supplied in the data argument. flags is
       an optional set of flags.

NOTES
       The following flags can be passed in the flags parameter.

       If PKCS7_DETACHED is set then cleartext signing will be used, this option only makes sense for
       signedData where PKCS7_DETACHED is also set when PKCS7_sign() is also called.

       If the PKCS7_TEXT flag is set MIME headers for type text/plain are added to the content, this only
       makes sense if PKCS7_DETACHED is also set.

       If cleartext signing is being used then the data must be read twice: once to compute the signature in
       PKCS7_sign() and once to output the S/MIME message.

BUGS
       SMIME_write_PKCS7() always base64 encodes PKCS#7 structures, there should be an option to disable
       this.

       There should really be a way to produce cleartext signing using only a single pass of the data.

RETURN VALUES
       SMIME_write_PKCS7() returns 1 for success or 0 for failure.

SEE ALSO
       ERR_get_error(3), PKCS7_sign(3), PKCS7_verify(3), PKCS7_encrypt(3) PKCS7_decrypt(3)

HISTORY
       SMIME_write_PKCS7() was added to OpenSSL 0.9.5



0.9.7l                                           2002-10-18                             SMIME_write_PKCS7(3)