NAME
PKCS7_decrypt - decrypt content from a PKCS#7 envelopedData structure
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/pkcs7.h>
int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags);
DESCRIPTION
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.
NOTES
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
PKCS#7 structure.
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.
RETURN VALUES
PKCS7_decrypt() returns either 1 for success or 0 for failure. The error
can be obtained from
ERR_get_error(3)
BUGS
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
mentioned in
PKCS7_sign() also applies to
PKCS7_verify().
SEE ALSO
ERR_get_error(3),
PKCS7_encrypt(3)
HISTORY
PKCS7_decrypt() was added to OpenSSL 0.9.5