crypto: Use the correct const type for driver

This allows the in memory structures to be read-only.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

crypto/cipher-afalg.c

@@ -218,7 +218,7 @@ static void qcrypto_afalg_comm_ctx_free(QCryptoCipher *cipher)
     qcrypto_afalg_comm_free(cipher->opaque);
 }
 
-struct QCryptoCipherDriver qcrypto_cipher_afalg_driver = {
+const struct QCryptoCipherDriver qcrypto_cipher_afalg_driver = {
     .cipher_encrypt = qcrypto_afalg_cipher_encrypt,
     .cipher_decrypt = qcrypto_afalg_cipher_decrypt,
     .cipher_setiv = qcrypto_afalg_cipher_setiv,

crypto/cipher-builtin.c.inc

@@ -522,7 +522,7 @@ qcrypto_builtin_cipher_setiv(QCryptoCipher *cipher,
 }
 
 
-static struct QCryptoCipherDriver qcrypto_cipher_lib_driver = {
+static const struct QCryptoCipherDriver qcrypto_cipher_lib_driver = {
     .cipher_encrypt = qcrypto_builtin_cipher_encrypt,
     .cipher_decrypt = qcrypto_builtin_cipher_decrypt,
     .cipher_setiv = qcrypto_builtin_cipher_setiv,

crypto/cipher-gcrypt.c.inc

@@ -413,7 +413,7 @@ qcrypto_gcrypt_cipher_setiv(QCryptoCipher *cipher,
 }
 
 
-static struct QCryptoCipherDriver qcrypto_cipher_lib_driver = {
+static const struct QCryptoCipherDriver qcrypto_cipher_lib_driver = {
     .cipher_encrypt = qcrypto_gcrypt_cipher_encrypt,
     .cipher_decrypt = qcrypto_gcrypt_cipher_decrypt,
     .cipher_setiv = qcrypto_gcrypt_cipher_setiv,

crypto/cipher-nettle.c.inc

@@ -724,7 +724,7 @@ qcrypto_nettle_cipher_setiv(QCryptoCipher *cipher,
 }
 
 
-static struct QCryptoCipherDriver qcrypto_cipher_lib_driver = {
+static const struct QCryptoCipherDriver qcrypto_cipher_lib_driver = {
     .cipher_encrypt = qcrypto_nettle_cipher_encrypt,
     .cipher_decrypt = qcrypto_nettle_cipher_decrypt,
     .cipher_setiv = qcrypto_nettle_cipher_setiv,

crypto/cipher.c

@@ -165,7 +165,7 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
 {
     QCryptoCipher *cipher;
     void *ctx = NULL;
-    QCryptoCipherDriver *drv = NULL;
+    const QCryptoCipherDriver *drv = NULL;
 
 #ifdef CONFIG_AF_ALG
     ctx = qcrypto_afalg_cipher_ctx_new(alg, mode, key, nkey, NULL);
@@ -187,7 +187,7 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
     cipher->alg = alg;
     cipher->mode = mode;
     cipher->opaque = ctx;
-    cipher->driver = (void *)drv;
+    cipher->driver = drv;
 
     return cipher;
 }
@@ -199,7 +199,7 @@ int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
                            size_t len,
                            Error **errp)
 {
-    QCryptoCipherDriver *drv = cipher->driver;
+    const QCryptoCipherDriver *drv = cipher->driver;
     return drv->cipher_encrypt(cipher, in, out, len, errp);
 }
 
@@ -210,7 +210,7 @@ int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
                            size_t len,
                            Error **errp)
 {
-    QCryptoCipherDriver *drv = cipher->driver;
+    const QCryptoCipherDriver *drv = cipher->driver;
     return drv->cipher_decrypt(cipher, in, out, len, errp);
 }
 
@@ -219,14 +219,14 @@ int qcrypto_cipher_setiv(QCryptoCipher *cipher,
                          const uint8_t *iv, size_t niv,
                          Error **errp)
 {
-    QCryptoCipherDriver *drv = cipher->driver;
+    const QCryptoCipherDriver *drv = cipher->driver;
     return drv->cipher_setiv(cipher, iv, niv, errp);
 }
 
 
 void qcrypto_cipher_free(QCryptoCipher *cipher)
 {
-    QCryptoCipherDriver *drv;
+    const QCryptoCipherDriver *drv;
     if (cipher) {
         drv = cipher->driver;
         drv->cipher_free(cipher);

crypto/cipherpriv.h

@@ -47,7 +47,7 @@ qcrypto_afalg_cipher_ctx_new(QCryptoCipherAlgorithm alg,
                              const uint8_t *key,
                              size_t nkey, Error **errp);
 
-extern struct QCryptoCipherDriver qcrypto_cipher_afalg_driver;
+extern const struct QCryptoCipherDriver qcrypto_cipher_afalg_driver;
 
 #endif
 

include/crypto/cipher.h

@@ -81,7 +81,7 @@ struct QCryptoCipher {
     QCryptoCipherAlgorithm alg;
     QCryptoCipherMode mode;
     void *opaque;
-    void *driver;
+    const QCryptoCipherDriver *driver;
 };
 
 /**