1SMIME_write_PKCS7(3)                OpenSSL               SMIME_write_PKCS7(3)
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NAME

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

9        #include <openssl/pkcs7.h>
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11        int SMIME_write_PKCS7(BIO *out, PKCS7 *p7, BIO *data, int flags);
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DESCRIPTION

14       SMIME_write_PKCS7() adds the appropriate MIME headers to a PKCS#7
15       structure to produce an S/MIME message.
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17       out is the BIO to write the data to. p7 is the appropriate PKCS7
18       structure. If streaming is enabled then the content must be supplied in
19       the data argument. flags is an optional set of flags.
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NOTES

22       The following flags can be passed in the flags parameter.
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24       If PKCS7_DETACHED is set then cleartext signing will be used, this
25       option only makes sense for signedData where PKCS7_DETACHED is also set
26       when PKCS7_sign() is also called.
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28       If the PKCS7_TEXT flag is set MIME headers for type text/plain are
29       added to the content, this only makes sense if PKCS7_DETACHED is also
30       set.
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32       If the PKCS7_STREAM flag is set streaming is performed. This flag
33       should only be set if PKCS7_STREAM was also set in the previous call to
34       PKCS7_sign() or PKCS7_encrypt().
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36       If cleartext signing is being used and PKCS7_STREAM not set then the
37       data must be read twice: once to compute the signature in PKCS7_sign()
38       and once to output the S/MIME message.
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40       If streaming is performed the content is output in BER format using
41       indefinite length constructuted encoding except in the case of signed
42       data with detached content where the content is absent and DER format
43       is used.
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BUGS

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

50       SMIME_write_PKCS7() returns 1 for success or 0 for failure.
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SEE ALSO

53       ERR_get_error(3), PKCS7_sign(3), PKCS7_verify(3), PKCS7_encrypt(3)
54       PKCS7_decrypt(3)
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HISTORY

57       SMIME_write_PKCS7() was added to OpenSSL 0.9.5
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611.0.2o                            2020-08-01              SMIME_write_PKCS7(3)