PKCS7_decrypt - decrypt content from a PKCS#7 envelopedData structure
int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags);
PKCS7_decrypt() extracts and decrypts the content from a
PKCS#7 envelopedData structure. pkey is the private key of the recipient, cert is the recipients certificate, data is a BIO to write the content to and
flags is an optional set of flags.
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
The following flags can be passed in the flags parameter.
If the PKCS7_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.
PKCS7_decrypt() returns either 1 for success or 0 for failure.
The error can be obtained from
PKCS7_decrypt() must be passed the correct recipient key and
certificate. It would be better if it could look up the correct key and
certificate from a database.
The lack of single pass processing and need to hold all data in memory as
PKCS7_sign() also applies to
PKCS7_decrypt() was added to OpenSSL 0.9.5