CentOS 7.0 - man page for cms_decrypt (centos section 3)
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CMS_decrypt(3) OpenSSL CMS_decrypt(3)
CMS_decrypt - decrypt content from a CMS envelopedData structure
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 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
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
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().
CMS_decrypt() was added to OpenSSL 0.9.8
1.0.1e 2013-02-11 CMS_decrypt(3)
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