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authorDaniel P. Berrange <berrange@redhat.com>2015-10-23 16:13:50 +0100
committerDaniel P. Berrange <berrange@redhat.com>2015-12-23 11:02:20 +0000
commitdd2bf9eb95f875f0ad6a15aecb48cfc8b739fcbc (patch)
treecbc8e4b7a4f1af17d438cf51f5c0a558bd5472f6 /include/crypto/cipher.h
parent5dc42c186d63b7b338594fc071cf290805dcc5a5 (diff)
downloadqemu-arm-dd2bf9eb95f875f0ad6a15aecb48cfc8b739fcbc.tar.gz
crypto: add additional query accessors for cipher instances
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>
Diffstat (limited to 'include/crypto/cipher.h')
-rw-r--r--include/crypto/cipher.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/include/crypto/cipher.h b/include/crypto/cipher.h
index b4d714f269..aa51c89f8e 100644
--- a/include/crypto/cipher.h
+++ b/include/crypto/cipher.h
@@ -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: