CMS_UNCOMPRESS(3)          Library Functions Manual          CMS_UNCOMPRESS(3)

NAME
     CMS_uncompress - uncompress a CMS CompressedData structure

SYNOPSIS
     #include <openssl/cms.h>

     int
     CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
         unsigned int flags);

DESCRIPTION
     CMS_uncompress() extracts and uncompresses the content of a CMS
     CompressedData structure cms and writes it to out.

     In the rare case where the compressed content is detached, pass it in via
     dcont.  For normal use, set dcont to NULL.

     The only currently supported compression algorithm is zlib: if the
     structure indicates the use of any other algorithm, an error is returned.
     If zlib support is not compiled in, CMS_uncompress() always returns an
     error.

     If the CMS_TEXT bit is set in flags, MIME headers for type text/plain are
     deleted from the content.  If the content is not of type text/plain, an
     error is returned.

RETURN VALUES
     CMS_uncompress() returns 1 for success or 0 for failure.  The error can
     be obtained from ERR_get_error(3).

SEE ALSO
     CMS_compress(3), CMS_ContentInfo_new(3)

STANDARDS
     RFC 3274: Compressed Data Content Type for Cryptographic Message Syntax
     (CMS)

HISTORY
     CMS_uncompress() first appeared in OpenSSL 0.9.8h and has been available
     since OpenBSD 6.7.

BUGS
     The lack of single pass processing and the need to hold all data in
     memory as mentioned in CMS_verify(3) also applies to CMS_uncompress().

Linux 6.8.2-arch2-1            November 2, 2019            Linux 6.8.2-arch2-1