定义JNI方法

 companion object{init {System.loadLibrary("jnitest")}}external fun encryptAES(data :ByteArray): ByteArray?external fun decryptAES(data :ByteArray): ByteArray?

使用OpenSSL方法实现AES加密和解密

 #include "include/openssl/aes.h"const char* key_data = "0123456789abcdef";extern "C"JNIEXPORT jbyteArray JNICALLJava_com_test_jnitest_TestLib_encryptAES(JNIEnv *env, jobject thiz, jbyteArray data_) {size_t len = strlen(key_data);  // 数据长度unsigned char* unsigned_key_data = new unsigned char[len];  // 分配内存空间// 将数据复制到内存空间中memcpy(unsigned_key_data, key_data, len);jbyte *data = env->GetByteArrayElements( data_, NULL);jsize data_length = env->GetArrayLength( data_);// 创建 AES 上下文对象AES_KEY aes_key;if (AES_set_encrypt_key(unsigned_key_data, len * 8, &aes_key) < 0) {return NULL;}// 分配加密结果缓冲区int out_size = data_length + AES_BLOCK_SIZE;unsigned char *encrypted_data = (unsigned char *) malloc(out_size);if (encrypted_data == NULL) {return NULL;}// 执行加密操作AES_cbc_encrypt((unsigned char *) data, encrypted_data, data_length, &aes_key,unsigned_key_data, AES_ENCRYPT);// 将加密结果转换为 Java 中的 byte 数组返回jbyteArray result = env->NewByteArray( out_size);env->SetByteArrayRegion( result, 0, out_size, (jbyte *) encrypted_data);// 释放内存free(encrypted_data);env->ReleaseByteArrayElements( data_, data, JNI_ABORT);return result;}extern "C"JNIEXPORT jbyteArray JNICALLJava_com_test_jnitest_TestLib_decryptAES(JNIEnv *env, jobject thiz, jbyteArray data_) {size_t len = strlen(key_data);  // 数据长度unsigned char* unsigned_key_data = new unsigned char[len];  // 分配内存空间// 将数据复制到内存空间中memcpy(unsigned_key_data, key_data, len);jbyte *data = env->GetByteArrayElements( data_, NULL);jsize data_length = env->GetArrayLength( data_);// 创建 AES 上下文对象AES_KEY aes_key;if (AES_set_decrypt_key(unsigned_key_data, len * 8, &aes_key) < 0) {return NULL;}// 分配解密结果缓冲区int out_size = data_length - AES_BLOCK_SIZE;unsigned char *decrypted_data = (unsigned char *) malloc(out_size);if (decrypted_data == NULL) {return NULL;}// 执行解密操作AES_cbc_encrypt((unsigned char *) data, decrypted_data, data_length, &aes_key,unsigned_key_data, AES_DECRYPT);// 将解密结果转换为 Java 中的 byte 数组返回jbyteArray result = env->NewByteArray( out_size);env->SetByteArrayRegion( result, 0, out_size, (jbyte *) decrypted_data);// 释放内存free(decrypted_data);env->ReleaseByteArrayElements( data_, data, JNI_ABORT);return result;}

应用

 var testLib = TestLib()var encrpy = testLib.encryptAES("HelloWorld!!!!!!".toByteArray())encrpy?.let {var decrpy = testLib.decryptAES(it)decrpy?.let {Log.i(TAG, String(it))}}