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


        #include <openssl/pkcs7.h>

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


       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 streaming
       is enabled then the content must be supplied in the data argument. flags is an optional
       set of flags.


       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 the PKCS7_STREAM flag is set streaming is performed. This flag should only be set if
       PKCS7_STREAM was also set in the previous call to PKCS7_sign() or PKCS7_encrypt().

       If cleartext signing is being used and PKCS7_STREAM not set then the data must be read
       twice: once to compute the signature in PKCS7_sign() and once to output the S/MIME

       If streaming is performed the content is output in BER format using indefinite length
       constructed encoding except in the case of signed data with detached content where the
       content is absent and DER format is used.


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


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


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


       Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use this file except in
       compliance with the License.  You can obtain a copy in the file LICENSE in the source
       distribution or at <>.