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Editing: BIO_new_CMS.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" .Vb 1 \& BIO_new_CMS \- CMS streaming filter BIO .Ve .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/cms.h> \& \& BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBIO_new_CMS()\fR returns a streaming filter \s-1BIO\s0 chain based on \fBcms\fR. The output of the filter is written to \fBout\fR. Any data written to the chain is automatically translated to a \s-1BER\s0 format \s-1CMS\s0 structure of the appropriate type. .SH "NOTES" .IX Header "NOTES" The chain returned by this function behaves like a standard filter \s-1BIO.\s0 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 \fBBIO_flush()\fR must be called to finalise the structure. .PP The \fB\s-1CMS_STREAM\s0\fR flag must be included in the corresponding \fBflags\fR parameter of the \fBcms\fR creation function. .PP If an application wishes to write additional data to \fBout\fR BIOs should be removed from the chain using \fBBIO_pop()\fR and freed with \fBBIO_free()\fR until \fBout\fR is reached. If no additional data needs to be written \fBBIO_free_all()\fR can be called to free up the whole chain. .PP Any content written through the filter is used verbatim: no canonical translation is performed. .PP 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. .PP Large numbers of small writes through the chain should be avoided as this will produce an output consisting of lots of \s-1OCTET STRING\s0 structures. Prepending a \fBBIO_f_buffer()\fR buffering \s-1BIO\s0 will prevent this. .SH "BUGS" .IX Header "BUGS" There is currently no corresponding inverse \s-1BIO:\s0 i.e. one which can decode a \s-1CMS\s0 structure on the fly. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_new_CMS()\fR returns a \s-1BIO\s0 chain when successful or \s-1NULL\s0 if an error occurred. The error can be obtained from \fBERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3), \fBCMS_sign\fR\|(3), \&\fBCMS_encrypt\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBIO_new_CMS()\fR was added to OpenSSL 1.0.0
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