BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx -
cipher BIO filter
BIO_METHOD * BIO_f_cipher(void);
void BIO_set_cipher(BIO *b,const EVP_CIPHER *cipher,
unsigned char *key, unsigned char *iv, int enc);
int BIO_get_cipher_status(BIO *b)
int BIO_get_cipher_ctx(BIO *b, EVP_CIPHER_CTX **pctx)
BIO_f_cipher() returns the cipher BIO method. This is a filter
BIO that encrypts any data written through it, and decrypts any data read
from it. It is a BIO wrapper for the cipher routines
Cipher BIOs do not support
BIO_flush() on an encryption BIO that is being written through
is used to signal that no more data is to be encrypted: this is used to
flush and possibly pad the final block through the BIO.
BIO_set_cipher() sets the cipher of BIO b to cipher using key key
and IV iv. enc should be set to 1 for encryption and zero for decryption.
When reading from an encryption BIO the final block is automatically
decrypted and checked when EOF is detected.
BIO_get_cipher_status() is a
which can be called to determine whether the decryption operation was
BIO_get_cipher_ctx() is a
BIO_ctrl() macro which
retrieves the internal BIO cipher context. The retrieved context can be
used in conjunction with the standard cipher routines to set it up. This is
BIO_set_cipher() is not flexible enough for the
BIO_flush() must be called to flush the final block through the BIO. If it is not then the
final block will fail a subsequent decrypt.
When decrypting an error on the final block is signalled by a zero return
value from the read operation. A successful decrypt followed by EOF will
also return zero for the final read.
should be called to determine if the decrypt was successful.
As always, if
BIO_puts() support is
needed then it can be achieved by preceding the cipher BIO with a buffering
BIO_f_cipher() returns the cipher BIO method.
BIO_set_cipher() does not return a value.
BIO_get_cipher_status() returns 1 for a successful decrypt and
0 for failure.
BIO_get_cipher_ctx() currently always returns 1.