crypto: extend mode as a parameter in qcrypto_cipher_supports()

It can't guarantee all cipher modes are supported
if one cipher algorithm is supported by a backend.
Let's extend qcrypto_cipher_supports() to take both
the algorithm and mode as parameters.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

block/qcow.c

@@ -153,7 +153,8 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
         ret = -EINVAL;
         goto fail;
     }
-    if (!qcrypto_cipher_supports(QCRYPTO_CIPHER_ALG_AES_128)) {
+    if (!qcrypto_cipher_supports(QCRYPTO_CIPHER_ALG_AES_128,
+                                 QCRYPTO_CIPHER_MODE_CBC)) {
         error_setg(errp, "AES cipher not available");
         ret = -EINVAL;
         goto fail;

block/qcow2.c

@@ -959,7 +959,8 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
         ret = -EINVAL;
         goto fail;
     }
-    if (!qcrypto_cipher_supports(QCRYPTO_CIPHER_ALG_AES_128)) {
+    if (!qcrypto_cipher_supports(QCRYPTO_CIPHER_ALG_AES_128,
+                                 QCRYPTO_CIPHER_MODE_CBC)) {
         error_setg(errp, "AES cipher not available");
         ret = -EINVAL;
         goto fail;

crypto/cipher-builtin.c

@@ -400,14 +400,26 @@ static int qcrypto_cipher_init_des_rfb(QCryptoCipher *cipher,
 }
 
 
-bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
+bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
+                             QCryptoCipherMode mode)
 {
     switch (alg) {
     case QCRYPTO_CIPHER_ALG_DES_RFB:
     case QCRYPTO_CIPHER_ALG_AES_128:
     case QCRYPTO_CIPHER_ALG_AES_192:
     case QCRYPTO_CIPHER_ALG_AES_256:
+        break;
+    default:
+        return false;
+    }
+
+    switch (mode) {
+    case QCRYPTO_CIPHER_MODE_ECB:
+    case QCRYPTO_CIPHER_MODE_CBC:
+    case QCRYPTO_CIPHER_MODE_XTS:
         return true;
+    case QCRYPTO_CIPHER_MODE_CTR:
+        return false;
     default:
         return false;
     }

crypto/cipher-gcrypt.c

@@ -24,7 +24,8 @@
 #include <gcrypt.h>
 
 
-bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
+bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
+                             QCryptoCipherMode mode)
 {
     switch (alg) {
     case QCRYPTO_CIPHER_ALG_DES_RFB:
@@ -37,6 +38,16 @@ bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
     case QCRYPTO_CIPHER_ALG_SERPENT_256:
     case QCRYPTO_CIPHER_ALG_TWOFISH_128:
     case QCRYPTO_CIPHER_ALG_TWOFISH_256:
+        break;
+    default:
+        return false;
+    }
+
+    switch (mode) {
+    case QCRYPTO_CIPHER_MODE_ECB:
+    case QCRYPTO_CIPHER_MODE_CBC:
+    case QCRYPTO_CIPHER_MODE_XTS:
+    case QCRYPTO_CIPHER_MODE_CTR:
         return true;
     default:
         return false;

crypto/cipher-nettle.c

@@ -191,7 +191,8 @@ struct QCryptoCipherNettle {
     size_t blocksize;
 };
 
-bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
+bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
+                             QCryptoCipherMode mode)
 {
     switch (alg) {
     case QCRYPTO_CIPHER_ALG_DES_RFB:
@@ -205,6 +206,16 @@ bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
     case QCRYPTO_CIPHER_ALG_TWOFISH_128:
     case QCRYPTO_CIPHER_ALG_TWOFISH_192:
     case QCRYPTO_CIPHER_ALG_TWOFISH_256:
+        break;
+    default:
+        return false;
+    }
+
+    switch (mode) {
+    case QCRYPTO_CIPHER_MODE_ECB:
+    case QCRYPTO_CIPHER_MODE_CBC:
+    case QCRYPTO_CIPHER_MODE_XTS:
+    case QCRYPTO_CIPHER_MODE_CTR:
         return true;
     default:
         return false;

include/crypto/cipher.h

@@ -85,13 +85,15 @@ struct QCryptoCipher {
 /**
  * qcrypto_cipher_supports:
  * @alg: the cipher algorithm
+ * @mode: the cipher mode
  *
- * Determine if @alg cipher algorithm is supported by the
+ * Determine if @alg cipher algorithm in @mode is supported by the
  * current configured build
  *
  * Returns: true if the algorithm is supported, false otherwise
  */
-bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg);
+bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
+                             QCryptoCipherMode mode);
 
 /**
  * qcrypto_cipher_get_block_len:

tests/test-crypto-cipher.c

@@ -616,7 +616,7 @@ int main(int argc, char **argv)
     g_assert(qcrypto_init(NULL) == 0);
 
     for (i = 0; i < G_N_ELEMENTS(test_data); i++) {
-        if (qcrypto_cipher_supports(test_data[i].alg)) {
+        if (qcrypto_cipher_supports(test_data[i].alg, test_data[i].mode)) {
             g_test_add_data_func(test_data[i].path, &test_data[i], test_cipher);
         }
     }

ui/vnc.c

@@ -3606,7 +3606,7 @@ void vnc_display_open(const char *id, Error **errp)
             goto fail;
         }
         if (!qcrypto_cipher_supports(
-                QCRYPTO_CIPHER_ALG_DES_RFB)) {
+                QCRYPTO_CIPHER_ALG_DES_RFB, QCRYPTO_CIPHER_MODE_ECB)) {
             error_setg(errp,
                        "Cipher backend does not support DES RFB algorithm");
             goto fail;