SMIME_write_PKCS7(3SSL) OpenSSL SMIME_write_PKCS7(3SSL)
SMIME_write_PKCS7 - convert PKCS#7 structure to S/MIME format.
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 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.
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
If the PKCS7_PARTSIGN flag is set the signed data is finalized and
output along with the content. This flag should only be set if
PKCS7_DETACHED is also set and the previous call to PKCS7_sign() also
set these flags.
If cleartext signing is being used and PKCS7_PARTSIGN not set then the
data must be read twice: once to compute the signature in PKCS7_sign()
and once to output the S/MIME message.
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)
SMIME_write_PKCS7() was added to OpenSSL 0.9.5
0.9.8g 2003-02-15 SMIME_write_PKCS7(3SSL)