BIO_f_cipher
Section: OpenSSL (3)
Updated: 2017-05-25
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NAME
BIO_f_cipher, BIO_set_cipher, BIO_get_cipher_status, BIO_get_cipher_ctx - cipher BIO filter
SYNOPSIS
#include <openssl/bio.h>
#include <openssl/evp.h>
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)
DESCRIPTION
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 applications needs.
NOTES
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.
RETURN VALUES
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.
EXAMPLES
TBA
SEE ALSO
TBA
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- NOTES
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- RETURN VALUES
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- EXAMPLES
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- SEE ALSO
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