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crypto: add additional query accessors for cipher instances

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Adds new methods to allow querying the length of the cipher
key, block size and initialization vectors.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2015-10-23 16:13:50 +01:00
parent 5dc42c186d
commit dd2bf9eb95
3 changed files with 95 additions and 0 deletions
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37
include/crypto/cipher.h
View file

@ -107,6 +107,43 @@ struct QCryptoCipher {
*/
bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg);
/**
* qcrypto_cipher_get_block_len:
* @alg: the cipher algorithm
*
* Get the required data block size in bytes. When
* encrypting data, it must be a multiple of the
* block size.
*
* Returns: the block size in bytes
*/
size_t qcrypto_cipher_get_block_len(QCryptoCipherAlgorithm alg);
/**
* qcrypto_cipher_get_key_len:
* @alg: the cipher algorithm
*
* Get the required key size in bytes.
*
* Returns: the key size in bytes
*/
size_t qcrypto_cipher_get_key_len(QCryptoCipherAlgorithm alg);
/**
* qcrypto_cipher_get_iv_len:
* @alg: the cipher algorithm
* @mode: the cipher mode
*
* Get the required initialization vector size
* in bytes, if one is required.
*
* Returns: the IV size in bytes, or 0 if no IV is permitted
*/
size_t qcrypto_cipher_get_iv_len(QCryptoCipherAlgorithm alg,
QCryptoCipherMode mode);
/**
* qcrypto_cipher_new: