crypto: introduce generic cipher API & built-in implementation

Introduce a generic cipher API and an implementation of it that
supports only the built-in AES and DES-RFB algorithms.

The test suite checks the supported algorithms + modes to
validate that every backend implementation is actually correctly
complying with the specs.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1435770638-25715-5-git-send-email-berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/crypto/cipher.c b/crypto/cipher.c
new file mode 100644
index 0000000000..0944827fa1
--- /dev/null
+++ b/crypto/cipher.c
@@ -0,0 +1,49 @@
+/*
+ * QEMU Crypto cipher algorithms
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "crypto/cipher.h"
+
+static size_t alg_key_len[QCRYPTO_CIPHER_ALG_LAST] = {
+    [QCRYPTO_CIPHER_ALG_AES_128] = 16,
+    [QCRYPTO_CIPHER_ALG_AES_192] = 24,
+    [QCRYPTO_CIPHER_ALG_AES_256] = 32,
+    [QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
+};
+
+static bool
+qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
+                                   size_t nkey,
+                                   Error **errp)
+{
+    if ((unsigned)alg >= QCRYPTO_CIPHER_ALG_LAST) {
+        error_setg(errp, "Cipher algorithm %d out of range",
+                   alg);
+        return false;
+    }
+
+    if (alg_key_len[alg] != nkey) {
+        error_setg(errp, "Cipher key length %zu should be %zu",
+                   alg_key_len[alg], nkey);
+        return false;
+    }
+    return true;
+}
+
+#include "crypto/cipher-builtin.c"