Linux 2.6 - man page for bio_get_cipher_status (linux section 3SSL)
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BIO_f_cipher(3SSL) OpenSSL BIO_f_cipher(3SSL)
BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx - cipher BIO
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 EVP_CipherInit(), EVP_CipherUpdate() and EVP_CipherFinal().
Cipher BIOs do not support BIO_gets() or BIO_puts().
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 BIO_ctrl() macro which can be called to
determine whether the decryption operation was successful.
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 useful when BIO_set_cipher() is not flexible enough for the
When encrypting 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. BIO_get_cipher_status() should be called to determine if the decrypt was successful.
As always, if BIO_gets() or BIO_puts() support is needed then it can be achieved by
preceding the cipher BIO with a buffering BIO.
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.
1.0.0e 2003-02-27 BIO_f_cipher(3SSL)
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