Update native cipher to make use of the OpenSSL EVP API so that it can actually utilise hardware acceleration and other goodies.

Whereas before OpenSSL would often lose benchmarks now it always wins.

native/src/main/c/NativeCipherImpl.c

@@ -1,56 +0,0 @@
-#include "net_md_5_bungee_NativeCipherImpl.h"
-#include <openssl/aes.h>
-#include <jni.h>
-#include <stdio.h>
-#include <stdlib.h>
-#define BYTE unsigned char
-
-jlong Java_net_md_15_bungee_NativeCipherImpl_init
-(JNIEnv* env, jobject obj, jbyteArray key)
-{
-    AES_KEY *aes_key = malloc(sizeof(AES_KEY));
-
-    jboolean isKeyCopy;
-    BYTE *key_bytes = (BYTE*)(*env)->GetByteArrayElements(env, key, &isKeyCopy);
-    int key_length = (*env)->GetArrayLength(env, key) * 8; // in bits
-
-    AES_set_encrypt_key(key_bytes, key_length, aes_key);
-
-    if (isKeyCopy) {
-        (*env)->ReleaseByteArrayElements(env, key, (jbyte*)key_bytes, JNI_ABORT);
-    }
-    return (long) aes_key;
-}
-void Java_net_md_15_bungee_NativeCipherImpl_free
-(JNIEnv* env, jobject obj, jlong key)
-{
-    free((AES_KEY*)key);
-}
-void Java_net_md_15_bungee_NativeCipherImpl_cipher
-(JNIEnv* env, jobject obj, jboolean forEncryption, jlong key, jbyteArray iv, jlong in, jlong out, jint length)
-{
-    AES_KEY *aes_key = (AES_KEY*)key;
-
-    size_t buffer_length = (size_t) length;
-
-    BYTE *input =  (BYTE*) in;
-    BYTE *output =  (BYTE*) out;
-
-    jboolean isCopy;
-    BYTE *iv_bytes = (BYTE*)(*env)->GetByteArrayElements(env, iv, &isCopy);
-
-    AES_cfb8_encrypt(
-      input,                                     // input buffer
-      output,                                    // output buffer
-      buffer_length,                             // readable bytes
-      aes_key,                                   // encryption key
-      iv_bytes,                                  // IV
-      NULL,                                      // not needed
-      forEncryption ? AES_ENCRYPT : AES_DECRYPT  // encryption mode
-    );
-
-    // IV has changed, let's copy it back
-    if (isCopy) {
-      (*env)->ReleaseByteArrayElements(env, iv, (jbyte*)iv_bytes, 0);
-    }
-}