java数据的加解密

RSA为不对称的加密算法，用公钥加密、私钥解密，一般用于加密数据量不是很大的数据，比如加密密钥，比如数据签名、验证。

AES为对称加密，非对齐的加密数据长度亦要至少能被16整除，密码也至少16位，如果用128位CBC方式，还要提个一个初始向量iv，亦要是16位。

利用空档时间手写了一个cipher库
pom引用

io.github.tiger822 cipher 1.0

KeyPair keyPair= RSAUtil.buildKeyPair(); String publicKeyStr= base64Utils.encode( keyPair.getPublic().getEncoded()); String privateKeyStr= base64Utils.encode(keyPair.getPrivate().getEncoded()); System.out.println("public key:"+publicKeyStr); System.out.println("private key:"+privateKeyStr); CipherUtil cipher1=new RSAUtil(publicKeyStr); cipher1.initCipher(); String rawText="我是要加密的字符串，This is a string that needs to be encrypted"; byte[] encrypted= cipher1.encrypt(rawText.getBytes()); System.out.println("加密后的内容："+base64Utils.encode(encrypted)); byte[] e2=cipher1.encrypt("String 2".getBytes()); CipherUtil cipher2=new RSAUtil((RSAPrivateCrtKey) keyPair.getPrivate()); cipher2.initCipher(); String plaintext=new String(cipher2.decrypt(encrypted)); System.out.println("解密后的明文:"+plaintext); System.out.println(new String(cipher2.decrypt(e2)));

String test="this the string that need to protect"; KeyPair keyPair= RSAUtil.buildKeyPair(); CipherUtil cipherUtil=new RSAUtil((RSAPrivateKey) keyPair.getPrivate()); byte[] signCode=cipherUtil.sign(test.getBytes()); System.out.println("签名："+base64Utils.encode(signCode)); CipherUtil cipherUtil2=new RSAUtil(keyPair.getPublic().getEncoded()); if (cipherUtil2.verify(signCode,test.getBytes())){ System.out.println("验证通过"); } if (!cipherUtil2.verify(signCode,(test+".").getBytes())){ System.out.println("验证失败"); }

String rawText="这是加密字符串， I need to encrypt."; String password="abcd@1234"; String iv="123456"; CipherUtil aes=new AESUtil(password,iv); aes.initCipher(); byte[] secret=null; for (int i=0;i<3;i++){ secret= aes.encrypt(rawText.getBytes()); System.out.println("AES加密后:"+base64Utils.encode(secret)); } CipherUtil aesDesc=new AESUtil(password,iv); aesDesc.initCipher(); byte[] plaintContent=aesDesc.decrypt(secret); System.out.println("解密后："+new String(plaintContent));