migration/postcopy: break the loop when there is no more page to discard

[mirror_qemu.git] / crypto / cipher.c

diff --git a/crypto/cipher.c b/crypto/cipher.c
index 89fa5a2c70cec4d1ef49f923e5526fc2fe38e3a4..e5adb56271e0612a6b62eb87abcb108be04980fc 100644 (file)
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -6,7 +6,7 @@
  * 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.
+ * version 2.1 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
@@ -19,7 +19,9 @@
  */
 
 #include "qemu/osdep.h"
+#include "qapi/error.h"
 #include "crypto/cipher.h"
+#include "cipherpriv.h"
 
 
 static size_t alg_key_len[QCRYPTO_CIPHER_ALG__MAX] = {
@@ -27,6 +29,7 @@ static size_t alg_key_len[QCRYPTO_CIPHER_ALG__MAX] = {
     [QCRYPTO_CIPHER_ALG_AES_192] = 24,
     [QCRYPTO_CIPHER_ALG_AES_256] = 32,
     [QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
+    [QCRYPTO_CIPHER_ALG_3DES] = 24,
     [QCRYPTO_CIPHER_ALG_CAST5_128] = 16,
     [QCRYPTO_CIPHER_ALG_SERPENT_128] = 16,
     [QCRYPTO_CIPHER_ALG_SERPENT_192] = 24,
@@ -41,6 +44,7 @@ static size_t alg_block_len[QCRYPTO_CIPHER_ALG__MAX] = {
     [QCRYPTO_CIPHER_ALG_AES_192] = 16,
     [QCRYPTO_CIPHER_ALG_AES_256] = 16,
     [QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
+    [QCRYPTO_CIPHER_ALG_3DES] = 8,
     [QCRYPTO_CIPHER_ALG_CAST5_128] = 8,
     [QCRYPTO_CIPHER_ALG_SERPENT_128] = 16,
     [QCRYPTO_CIPHER_ALG_SERPENT_192] = 16,
@@ -53,23 +57,21 @@ static size_t alg_block_len[QCRYPTO_CIPHER_ALG__MAX] = {
 static bool mode_need_iv[QCRYPTO_CIPHER_MODE__MAX] = {
     [QCRYPTO_CIPHER_MODE_ECB] = false,
     [QCRYPTO_CIPHER_MODE_CBC] = true,
+    [QCRYPTO_CIPHER_MODE_XTS] = true,
+    [QCRYPTO_CIPHER_MODE_CTR] = true,
 };
 
 
 size_t qcrypto_cipher_get_block_len(QCryptoCipherAlgorithm alg)
 {
-    if (alg >= G_N_ELEMENTS(alg_key_len)) {
-        return 0;
-    }
+    assert(alg < G_N_ELEMENTS(alg_key_len));
     return alg_block_len[alg];
 }
 
 
 size_t qcrypto_cipher_get_key_len(QCryptoCipherAlgorithm alg)
 {
-    if (alg >= G_N_ELEMENTS(alg_key_len)) {
-        return 0;
-    }
+    assert(alg < G_N_ELEMENTS(alg_key_len));
     return alg_key_len[alg];
 }
 
@@ -93,6 +95,7 @@ size_t qcrypto_cipher_get_iv_len(QCryptoCipherAlgorithm alg,
 
 static bool
 qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
+                                   QCryptoCipherMode mode,
                                    size_t nkey,
                                    Error **errp)
 {
@@ -102,10 +105,28 @@ qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
         return false;
     }
 
-    if (alg_key_len[alg] != nkey) {
-        error_setg(errp, "Cipher key length %zu should be %zu",
-                   nkey, alg_key_len[alg]);
-        return false;
+    if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+        if (alg == QCRYPTO_CIPHER_ALG_DES_RFB
+                || alg == QCRYPTO_CIPHER_ALG_3DES) {
+            error_setg(errp, "XTS mode not compatible with DES-RFB/3DES");
+            return false;
+        }
+        if (nkey % 2) {
+            error_setg(errp, "XTS cipher key length should be a multiple of 2");
+            return false;
+        }
+
+        if (alg_key_len[alg] != (nkey / 2)) {
+            error_setg(errp, "Cipher key length %zu should be %zu",
+                       nkey, alg_key_len[alg] * 2);
+            return false;
+        }
+    } else {
+        if (alg_key_len[alg] != nkey) {
+            error_setg(errp, "Cipher key length %zu should be %zu",
+                       nkey, alg_key_len[alg]);
+            return false;
+        }
     }
     return true;
 }
@@ -129,9 +150,85 @@ qcrypto_cipher_munge_des_rfb_key(const uint8_t *key,
 #endif /* CONFIG_GCRYPT || CONFIG_NETTLE */
 
 #ifdef CONFIG_GCRYPT
-#include "crypto/cipher-gcrypt.c"
+#include "cipher-gcrypt.c"
 #elif defined CONFIG_NETTLE
-#include "crypto/cipher-nettle.c"
+#include "cipher-nettle.c"
 #else
-#include "crypto/cipher-builtin.c"
+#include "cipher-builtin.c"
+#endif
+
+QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
+                                  QCryptoCipherMode mode,
+                                  const uint8_t *key, size_t nkey,
+                                  Error **errp)
+{
+    QCryptoCipher *cipher;
+    void *ctx = NULL;
+    QCryptoCipherDriver *drv = NULL;
+
+#ifdef CONFIG_AF_ALG
+    ctx = qcrypto_afalg_cipher_ctx_new(alg, mode, key, nkey, NULL);
+    if (ctx) {
+        drv = &qcrypto_cipher_afalg_driver;
+    }
 #endif
+
+    if (!ctx) {
+        ctx = qcrypto_cipher_ctx_new(alg, mode, key, nkey, errp);
+        if (!ctx) {
+            return NULL;
+        }
+
+        drv = &qcrypto_cipher_lib_driver;
+    }
+
+    cipher = g_new0(QCryptoCipher, 1);
+    cipher->alg = alg;
+    cipher->mode = mode;
+    cipher->opaque = ctx;
+    cipher->driver = (void *)drv;
+
+    return cipher;
+}
+
+
+int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
+                           const void *in,
+                           void *out,
+                           size_t len,
+                           Error **errp)
+{
+    QCryptoCipherDriver *drv = cipher->driver;
+    return drv->cipher_encrypt(cipher, in, out, len, errp);
+}
+
+
+int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
+                           const void *in,
+                           void *out,
+                           size_t len,
+                           Error **errp)
+{
+    QCryptoCipherDriver *drv = cipher->driver;
+    return drv->cipher_decrypt(cipher, in, out, len, errp);
+}
+
+
+int qcrypto_cipher_setiv(QCryptoCipher *cipher,
+                         const uint8_t *iv, size_t niv,
+                         Error **errp)
+{
+    QCryptoCipherDriver *drv = cipher->driver;
+    return drv->cipher_setiv(cipher, iv, niv, errp);
+}
+
+
+void qcrypto_cipher_free(QCryptoCipher *cipher)
+{
+    QCryptoCipherDriver *drv;
+    if (cipher) {
+        drv = cipher->driver;
+        drv->cipher_free(cipher);
+        g_free(cipher);
+    }
+}