java aes CBC的填充方式发现
public static String aesEncrypt2(String appsecret, String data) throws Exception {//设置加密密钥 String key = appsecret.substring(16);
System.out.println(key);
SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
//初始化向量
System.out.println("md5: " + DigestUtils.md5Hex(appsecret).substring(0, 16));
String iv = DigestUtils.md5Hex(appsecret).substring(0, 16);
IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
//设置加密模式
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
//填充算法
int blockSize = cipher.getBlockSize();
byte[] dataBytes = data.getBytes();
int plaintextLength = dataBytes.length;
if (plaintextLength % blockSize != 0) {
plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
}
byte[] plaintext = new byte;
System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
System.out.println("填充后长度=" + plaintext.length);
for(int i = 0;i < plaintext.length; i++)
System.out.print(plaintext + " ");
//加密
cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
byte[] encrypted = cipher.doFinal(plaintext);
System.out.println("");
for(int i = 0;i < encrypted.length;i++)
System.out.print(encrypted + " ");
System.out.println("");
return Base64.encodeBase64String(encrypted);
}
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