PKCS7_decrypt - decrypt content from a PKCS#7 envelopedData structure
int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags);
extracts and decrypts the content from a PKCS#7
envelopedData structure. pkey
is the private key of the recipient,
is the recipients certificate, data
is a BIO to write the
content to and flags
is an optional set of flags.
(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
If the PKCS7_TEXT
flag is set MIME headers for type text/plain
deleted from the content. If the content is not of type text/plain
an error is returned.
returns either 1 for success or 0 for failure. The error
can be obtained from ERR_get_error(3)
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
The lack of single pass processing and need to hold all data in memory as
mentioned in PKCS7_sign()
also applies to PKCS7_verify()
was added to OpenSSL 0.9.5