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author | marha <marha@users.sourceforge.net> | 2010-03-30 12:36:28 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2010-03-30 12:36:28 +0000 |
commit | ff48c0d9098080b51ea12710029135916d117806 (patch) | |
tree | 96e6af9caf170ba21a1027b24e306a07e27d7b75 /openssl/doc/crypto/BIO_new_CMS.pod | |
parent | bb731f5ac92655c4860a41fa818a7a63005f8369 (diff) | |
download | vcxsrv-ff48c0d9098080b51ea12710029135916d117806.tar.gz vcxsrv-ff48c0d9098080b51ea12710029135916d117806.tar.bz2 vcxsrv-ff48c0d9098080b51ea12710029135916d117806.zip |
svn merge -r514:HEAD ^/branches/released .
Diffstat (limited to 'openssl/doc/crypto/BIO_new_CMS.pod')
-rw-r--r-- | openssl/doc/crypto/BIO_new_CMS.pod | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/openssl/doc/crypto/BIO_new_CMS.pod b/openssl/doc/crypto/BIO_new_CMS.pod new file mode 100644 index 000000000..9e3a4b7f8 --- /dev/null +++ b/openssl/doc/crypto/BIO_new_CMS.pod @@ -0,0 +1,66 @@ +=pod + +=head1 NAME + + BIO_new_CMS - CMS streaming filter BIO + +=head1 SYNOPSIS + + #include <openssl/cms.h> + + BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms); + +=head1 DESCRIPTION + +BIO_new_CMS() returns a streaming filter BIO chain based on B<cms>. The output +of the filter is written to B<out>. Any data written to the chain is +automatically translated to a BER format CMS structure of the appropriate type. + +=head1 NOTES + +The chain returned by this function behaves like a standard filter BIO. It +supports non blocking I/O. Content is processed and streamed on the fly and not +all held in memory at once: so it is possible to encode very large structures. +After all content has been written through the chain BIO_flush() must be called +to finalise the structure. + +The B<CMS_STREAM> flag must be included in the corresponding B<flags> +parameter of the B<cms> creation function. + +If an application wishes to write additional data to B<out> BIOs should be +removed from the chain using BIO_pop() and freed with BIO_free() until B<out> +is reached. If no additional data needs to be written BIO_free_all() can be +called to free up the whole chain. + +Any content written through the filter is used verbatim: no canonical +translation is performed. + +It is possible to chain multiple BIOs to, for example, create a triple wrapped +signed, enveloped, signed structure. In this case it is the applications +responsibility to set the inner content type of any outer CMS_ContentInfo +structures. + +Large numbers of small writes through the chain should be avoided as this will +produce an output consisting of lots of OCTET STRING structures. Prepending +a BIO_f_buffer() buffering BIO will prevent this. + +=head1 BUGS + +There is currently no corresponding inverse BIO: i.e. one which can decode +a CMS structure on the fly. + +=head1 RETURN VALUES + +BIO_new_CMS() returns a BIO chain when successful or NULL if an error +occurred. The error can be obtained from ERR_get_error(3). + +=head1 SEE ALSO + +L<ERR_get_error(3)|ERR_get_error(3)>, L<CMS_sign(3)|CMS_sign(3)>, +L<CMS_encrypt(3)|CMS_encrypt(3)> + +=head1 HISTORY + +BIO_new_CMS() was added to OpenSSL 1.0.0 + +=cut |