Merge pull request #253 from jasonkatonica/katonica/issue239/aescbcperf

Optimize AES/CBC cipher initialization

Author: keithc-ca

closed/src/java.base/share/classes/com/sun/crypto/provider/NativeCipherBlockChaining.java

@@ -24,7 +24,7 @@
  */
 /*
  * ===========================================================================
- * (c) Copyright IBM Corp. 2018, 2022 All Rights Reserved
+ * (c) Copyright IBM Corp. 2018, 2023 All Rights Reserved
  * ===========================================================================
  */
 
@@ -56,6 +56,7 @@ class NativeCipherBlockChaining extends FeedbackCipher  {
 
     private static final NativeCrypto nativeCrypto;
     private static final Cleaner contextCleaner;
+    private int previousKeyLength = -1;
 
     /*
      * Initialize the CBC context.
@@ -184,7 +185,12 @@ void init(boolean decrypting, String algorithm, byte[] key, byte[] iv)
 
         int ret;
         synchronized (this) {
-            ret = nativeCrypto.CBCInit(nativeContext, mode, iv, iv.length, key, key.length);
+            if (previousKeyLength == key.length) {
+                ret = nativeCrypto.CBCInit(nativeContext, mode, iv, iv.length, key, key.length, true);
+            } else {
+                ret = nativeCrypto.CBCInit(nativeContext, mode, iv, iv.length, key, key.length, false);
+                previousKeyLength = key.length;
+            }
         }
         if (ret == -1) {
             throw new ProviderException("Error in Native CipherBlockChaining");
@@ -201,7 +207,7 @@ void reset() {
         System.arraycopy(iv, 0, r, 0, blockSize);
         int ret;
         synchronized (this) {
-            ret = nativeCrypto.CBCInit(nativeContext, mode, iv, iv.length, key, key.length);
+            ret = nativeCrypto.CBCInit(nativeContext, mode, iv, iv.length, key, key.length, true);
         }
         if (ret == -1) {
             throw new ProviderException("Error in Native CipherBlockChaining");
@@ -225,7 +231,7 @@ void restore() {
         System.arraycopy(rSave, 0, r, 0, blockSize);
         int ret;
         synchronized (this) {
-            ret = nativeCrypto.CBCInit(nativeContext, mode, r, r.length, key, key.length);
+            ret = nativeCrypto.CBCInit(nativeContext, mode, r, r.length, key, key.length, true);
         }
         if (ret == -1) {
             throw new ProviderException("Error in Native CipherBlockChaining");

closed/src/java.base/share/classes/jdk/crypto/jniprovider/NativeCrypto.java

@@ -233,7 +233,8 @@ public final native int CBCInit(long context,
                                     byte[] iv,
                                     int ivlen,
                                     byte[] key,
-                                    int keylen);
+                                    int keylen,
+                                    boolean doReset);
 
     public final native int  CBCUpdate(long context,
                                        byte[] input,

closed/src/java.base/share/native/libjncrypto/NativeCrypto.c

@@ -1097,7 +1097,7 @@ JNIEXPORT jint JNICALL Java_jdk_crypto_jniprovider_NativeCrypto_DestroyContext
  */
 JNIEXPORT jint JNICALL Java_jdk_crypto_jniprovider_NativeCrypto_CBCInit
   (JNIEnv *env, jclass thisObj, jlong c, jint mode, jbyteArray iv, jint iv_len,
-  jbyteArray key, jint key_len)
+  jbyteArray key, jint key_len, jboolean doReset)
 {
     EVP_CIPHER_CTX *ctx = (EVP_CIPHER_CTX*)(intptr_t) c;
     unsigned char* ivNative = NULL;
@@ -1108,18 +1108,20 @@ JNIEXPORT jint JNICALL Java_jdk_crypto_jniprovider_NativeCrypto_CBCInit
         return -1;
     }
 
-    switch(key_len) {
-        case 16:
-            evp_cipher1 = (*OSSL_aes_128_cbc)();
-            break;
-        case 24:
-            evp_cipher1 = (*OSSL_aes_192_cbc)();
-            break;
-        case 32:
-            evp_cipher1 = (*OSSL_aes_256_cbc)();
-            break;
-        default:
-            break;
+    if (JNI_FALSE == doReset) {
+        switch (key_len) {
+            case 16:
+                evp_cipher1 = (*OSSL_aes_128_cbc)();
+                break;
+            case 24:
+                evp_cipher1 = (*OSSL_aes_192_cbc)();
+                break;
+            case 32:
+                evp_cipher1 = (*OSSL_aes_256_cbc)();
+                break;
+            default:
+                break;
+        }
     }
 
     ivNative = (unsigned char*)((*env)->GetByteArrayElements(env, iv, 0));
@@ -1140,7 +1142,9 @@ JNIEXPORT jint JNICALL Java_jdk_crypto_jniprovider_NativeCrypto_CBCInit
         return -1;
     }
 
-    (*OSSL_CIPHER_CTX_set_padding)(ctx, 0);
+    if (JNI_FALSE == doReset) {
+        (*OSSL_CIPHER_CTX_set_padding)(ctx, 0);
+    }
 
     (*env)->ReleaseByteArrayElements(env, iv, (jbyte*)ivNative, JNI_ABORT);
     (*env)->ReleaseByteArrayElements(env, key, (jbyte*)keyNative, JNI_ABORT);