NAME¶
SMIME_write_PKCS7 - convert PKCS#7 structure to S/MIME format.
SYNOPSIS¶
#include <openssl/pkcs7.h>
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 streaming is enabled then the content 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 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 message.
If streaming is performed the content is output in BER format using indefinite
length constructuted encoding except in the case of signed data with detached
content where the content is absent and DER format is used.
BUGS¶
SMIME_write_PKCS7() always base64 encodes PKCS#7 structures, there should
be an option to disable this.
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