crypto: cipher: introduce context free function

[qemu.git] / crypto / cipher-gcrypt.c

diff --git a/crypto/cipher-gcrypt.c b/crypto/cipher-gcrypt.c
index 6487ecaf37934bf2fb3649f8629c9d8afebba70c..0ecffa2751c4afde940f9e7e350c037fe1c21bc6 100644 (file)
--- a/crypto/cipher-gcrypt.c
+++ b/crypto/cipher-gcrypt.c
@@ -64,6 +64,22 @@ struct QCryptoCipherGcrypt {
     uint8_t *iv;
 };
 
+static void gcrypt_cipher_free_ctx(QCryptoCipherGcrypt *ctx,
+                                   QCryptoCipherMode mode)
+{
+    if (!ctx) {
+        return;
+    }
+
+    gcry_cipher_close(ctx->handle);
+    if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+        gcry_cipher_close(ctx->tweakhandle);
+    }
+    g_free(ctx->iv);
+    g_free(ctx);
+}
+
+
 QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
                                   QCryptoCipherMode mode,
                                   const uint8_t *key, size_t nkey,
@@ -228,11 +244,7 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
     return cipher;
 
  error:
-    gcry_cipher_close(ctx->handle);
-    if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
-        gcry_cipher_close(ctx->tweakhandle);
-    }
-    g_free(ctx);
+    gcrypt_cipher_free_ctx(ctx, mode);
     g_free(cipher);
     return NULL;
 }
@@ -240,17 +252,10 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
 
 void qcrypto_cipher_free(QCryptoCipher *cipher)
 {
-    QCryptoCipherGcrypt *ctx;
     if (!cipher) {
         return;
     }
-    ctx = cipher->opaque;
-    gcry_cipher_close(ctx->handle);
-    if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
-        gcry_cipher_close(ctx->tweakhandle);
-    }
-    g_free(ctx->iv);
-    g_free(ctx);
+    gcrypt_cipher_free_ctx(cipher->opaque, cipher->mode);
     g_free(cipher);
 }