CMS_decrypt man page on Archlinux

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CMS_decrypt(3)			    OpenSSL			CMS_decrypt(3)

	CMS_decrypt - decrypt content from a CMS envelopedData structure

	#include <openssl/cms.h>

	int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert, BIO *dcont, BIO *out, unsigned int flags);

       CMS_decrypt() extracts and decrypts the content from a CMS
       EnvelopedData structure. pkey is the private key of the recipient, cert
       is the recipient's certificate, out is a BIO to write the content to
       and flags is an optional set of flags.

       The dcont parameter is used in the rare case where the encrypted
       content is detached. It will normally be set to NULL.

       OpenSSL_add_all_algorithms() (or equivalent) should be called before
       using this function or errors about unknown algorithms will occur.

       Although the recipients certificate is not needed to decrypt the data
       it is needed to locate the appropriate (of possible several) recipients
       in the CMS structure. If cert is set to NULL all possible recipients
       are tried.

       It is possible to determine the correct recipient key by other means
       (for example looking them up in a database) and setting them in the CMS
       structure in advance using the CMS utility functions such as
       CMS_set1_pkey(). In this case both cert and pkey should be set to NULL.

       To process KEKRecipientInfo types CMS_set1_key() or
       CMS_RecipientInfo_set0_key() and CMS_ReceipientInfo_decrypt() should be
       called before CMS_decrypt() and cert and pkey set to NULL.

       The following flags can be passed in the flags parameter.

       If the CMS_TEXT flag is set MIME headers for type text/plain are
       deleted from the content. If the content is not of type text/plain then
       an error is returned.

       CMS_decrypt() returns either 1 for success or 0 for failure.  The error
       can be obtained from ERR_get_error(3)

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

       ERR_get_error(3), CMS_encrypt(3)

       CMS_decrypt() was added to OpenSSL 0.9.8

1.0.1g				  2014-03-17			CMS_decrypt(3)

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