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.\" ======================================================================== |
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.\" |
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.IX Title "BIO_new_CMS 3" |
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.TH BIO_new_CMS 3 "2016-09-22" "1.0.1u" "OpenSSL" |
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes |
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.\" way too many mistakes in technical documents. |
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.nh |
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.SH "NAME" |
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.Vb 1 |
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\& BIO_new_CMS \- CMS streaming filter BIO |
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.Ve |
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.SH "SYNOPSIS" |
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.IX Header "SYNOPSIS" |
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.Vb 1 |
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\& #include <openssl/cms.h> |
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\& |
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\& BIO *BIO_new_CMS(BIO *out, CMS_ContentInfo *cms); |
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.Ve |
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.SH "DESCRIPTION" |
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.IX Header "DESCRIPTION" |
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\&\fIBIO_new_CMS()\fR returns a streaming filter \s-1BIO\s0 chain based on \fBcms\fR. The output |
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of the filter is written to \fBout\fR. Any data written to the chain is |
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automatically translated to a \s-1BER\s0 format \s-1CMS\s0 structure of the appropriate type. |
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.SH "NOTES" |
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.IX Header "NOTES" |
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The chain returned by this function behaves like a standard filter \s-1BIO.\s0 It |
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supports non blocking I/O. Content is processed and streamed on the fly and not |
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all held in memory at once: so it is possible to encode very large structures. |
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After all content has been written through the chain \fIBIO_flush()\fR must be called |
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to finalise the structure. |
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.PP |
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The \fB\s-1CMS_STREAM\s0\fR flag must be included in the corresponding \fBflags\fR |
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parameter of the \fBcms\fR creation function. |
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.PP |
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If an application wishes to write additional data to \fBout\fR BIOs should be |
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removed from the chain using \fIBIO_pop()\fR and freed with \fIBIO_free()\fR until \fBout\fR |
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is reached. If no additional data needs to be written \fIBIO_free_all()\fR can be |
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called to free up the whole chain. |
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.PP |
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Any content written through the filter is used verbatim: no canonical |
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translation is performed. |
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.PP |
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It is possible to chain multiple BIOs to, for example, create a triple wrapped |
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signed, enveloped, signed structure. In this case it is the applications |
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responsibility to set the inner content type of any outer CMS_ContentInfo |
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structures. |
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.PP |
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Large numbers of small writes through the chain should be avoided as this will |
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produce an output consisting of lots of \s-1OCTET STRING\s0 structures. Prepending |
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a \fIBIO_f_buffer()\fR buffering \s-1BIO\s0 will prevent this. |
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.SH "BUGS" |
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.IX Header "BUGS" |
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There is currently no corresponding inverse \s-1BIO:\s0 i.e. one which can decode |
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a \s-1CMS\s0 structure on the fly. |
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.SH "RETURN VALUES" |
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.IX Header "RETURN VALUES" |
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\&\fIBIO_new_CMS()\fR returns a \s-1BIO\s0 chain when successful or \s-1NULL\s0 if an error |
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occurred. The error can be obtained from \fIERR_get_error\fR\|(3). |
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.SH "SEE ALSO" |
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.IX Header "SEE ALSO" |
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\&\fIERR_get_error\fR\|(3), \fICMS_sign\fR\|(3), |
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\&\fICMS_encrypt\fR\|(3) |
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.SH "HISTORY" |
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.IX Header "HISTORY" |
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\&\fIBIO_new_CMS()\fR was added to OpenSSL 1.0.0 |
