搭建网站论坛,wap网站乱码,洛可可,建设银行网站维修图片一、AES算法
AES是一种对称加密算法#xff0c;算法秘钥长度可为128位(16字节)、192位(24字节)、256位(32字节)。加密模式分为ECB、CBC、CTR等#xff0c;其中ECB模式最简单够用。现给出ECB模式下C和Java的实现#xff0c;并且可以相互加解密验证。
二、AES_ECB实现DEMO
…一、AES算法
AES是一种对称加密算法算法秘钥长度可为128位(16字节)、192位(24字节)、256位(32字节)。加密模式分为ECB、CBC、CTR等其中ECB模式最简单够用。现给出ECB模式下C和Java的实现并且可以相互加解密验证。
二、AES_ECB实现DEMO
2.1 C版本
#include string
#include vector
#include openssl/evp.hEVP_CIPHER *getAlgPoint(const int keyLen){EVP_CIPHER *pAlg nullptr;if (keyLen 16) {pAlg (EVP_CIPHER *)EVP_aes_128_ecb();}else if (keyLen 16 keyLen 24) {pAlg (EVP_CIPHER *)EVP_aes_192_ecb();}else{pAlg (EVP_CIPHER *)EVP_aes_256_ecb();}return pAlg;
}std::vectoruint8_t ecbEncrypt(const std::string key, const std::string str){if (key.empty() || str.empty()) {return {};}int encLen 0;int outlen 0;EVP_CIPHER_CTX* ctx EVP_CIPHER_CTX_new();std::vectoruint8_t encData(((str.size()/16)1) * 16);//加密后的长度是16的整数倍,明文刚好16整数倍则密文是明文长度16字节EVP_CipherInit_ex(ctx, getAlgPoint(key.size()), nullptr, (uint8_t*)key.data(), nullptr, 1);EVP_CipherUpdate(ctx, encData.data(), outlen, (const uint8_t *)str.c_str(), (int)str.size());encLen outlen;EVP_CipherFinal_ex(ctx, encData.data() outlen, outlen);encLen outlen;EVP_CIPHER_CTX_free(ctx);encData.resize(encLen);return encData;
}std::string ecbDecrypt(const std::string key, const std::vectoruint8_t str){if (key.empty() || str.empty()) {return ;}int decLen 0;int outlen 0;EVP_CIPHER_CTX* ctx EVP_CIPHER_CTX_new();std::vectoruint8_t decData(str.size());EVP_CipherInit_ex(ctx, getAlgPoint(key.size()), nullptr, (uint8_t*)key.data(), nullptr, 0);EVP_CipherUpdate(ctx, decData.data(), outlen, str.data(), (int)str.size());decLen outlen;EVP_CipherFinal(ctx, decData.data() outlen, outlen);decLen outlen;EVP_CIPHER_CTX_free(ctx);decData.resize(decLen);return std::string((char*)decData.data(), decData.size());
}int main(void){std::string tKey32 12345678901234567890123456789012;std::string tSrcMsg Hello World!;auto byteEnc ecbEncrypt(tKey32, tSrcMsg);auto b64Enc B64::encode(byteEnc.data(), byteEnc.size());//转base64打印加密后的内容, b64转换函数自己实现std::coutb64Enc: b64Enc std::endl;auto strDec ecbDecrypt(tKey32, byteEnc);std::coutdecMsg: strDecstd::endl;return 0;}demo运行结果
b64Enc:wC/nIjhaktigwT5VfVYXKA
decMsg:Hello World!2.2 Java版本
AESUtil.java
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;public class AESUtil {private static final String ALGORITHM AES;private static final String TRANSFORMATION AES/ECB/PKCS5Padding;public static String encrypt(String plainText, String key) throws Exception{SecretKeySpec secretKey new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), ALGORITHM);Cipher cipher Cipher.getInstance(TRANSFORMATION);cipher.init(Cipher.ENCRYPT_MODE, secretKey);byte[] eBytes cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));return Base64.getEncoder().encodeToString(eBytes);}public static String decrypt(String encryptedText, String key) throws Exception{SecretKeySpec secretKey new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), ALGORITHM);Cipher cipher Cipher.getInstance(TRANSFORMATION);cipher.init(Cipher.DECRYPT_MODE, secretKey);byte[] dBytes cipher.doFinal(Base64.getDecoder().decode(encryptedText));return new String(dBytes, StandardCharsets.UTF_8);}
}Main.java
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;public class Main {public static void main(String[] args) throws Exception {String strkey 12345678901234567890123456789012;String str Hello World!;String eStr AESUtil.encrypt(str, strkey);System.out.println(aes256 eStr: eStr);String dStr AESUtil.decrypt(eStr, strkey);System.out.println(aes256 dStr: dStr);}
}demo运行结果
aes256 eStr:wC/nIjhaktigwT5VfVYXKA
aes256 dStr:Hello World!C与Java的运行结果一致如果测试128、192位秘钥只用修改main函数中的秘钥长度其他部分不用改动。
