利用AES加密算法對報文進行加密解密，實現C#與Java互通，網上查了一堆也許是因為版本的原因都用不了，於是還是靜心下來自己寫個：
直接上代碼：
C# 需要引用System.Security.Cryptography命名空間
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/// <summary>AES加密</summary>
/// <param name="text">明文</param>
/// <param name="key">密鑰,長度為16的字符串</param>
/// <param name="iv">偏移量,長度為16的字符串</param>
/// <returns>密文</returns>
public
static
string
EncodeAES(
string
text,
string
key,
string
iv)
{
RijndaelManaged rijndaelCipher =
new
RijndaelManaged();
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.Zeros;
rijndaelCipher.KeySize = 128;
rijndaelCipher.BlockSize = 128;
byte
[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(key);
byte
[] keyBytes =
new
byte
[16];
int
len = pwdBytes.Length;
if
(len > keyBytes.Length)
len = keyBytes.Length;
System.Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = Encoding.UTF8.GetBytes(iv);
ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
byte
[] plainText = Encoding.UTF8.GetBytes(text);
byte
[] cipherBytes = transform.TransformFinalBlock(plainText, 0, plainText.Length);
return
Convert.ToBase64String(cipherBytes);
}
/// <summary>AES解密</summary>
/// <param name="text">密文</param>
/// <param name="key">密鑰,長度為16的字符串</param>
/// <param name="iv">偏移量,長度為16的字符串</param>
/// <returns>明文</returns>
public
static
string
DecodeAES(
string
text,
string
key,
string
iv)
{
RijndaelManaged rijndaelCipher =
new
RijndaelManaged();
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.Zeros;
rijndaelCipher.KeySize = 128;
rijndaelCipher.BlockSize = 128;
byte
[] encryptedData = Convert.FromBase64String(text);
byte
[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(key);
byte
[] keyBytes =
new
byte
[16];
int
len = pwdBytes.Length;
if
(len > keyBytes.Length)
len = keyBytes.Length;
System.Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = Encoding.UTF8.GetBytes(iv);
ICryptoTransform transform = rijndaelCipher.CreateDecryptor();
byte
[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
return
Encoding.UTF8.GetString(plainText);
}
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Java，需要以下引用：
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
另外需要對String和byte[]相互轉換的類，我自己寫的Base64Helper
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/**
* @author miracle.qu
* @see AES算法加密明文
* @param data 明文
* @param key 密鑰，長度16
* @param iv 偏移量，長度16
* @return 密文
*/
public
static
String encryptAES(String data,String key,String iv)
throws
Exception {
try
{
Cipher cipher = Cipher.getInstance(
"AES/CBC/NoPadding"
);
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
[plaintextLength];
System.arraycopy(dataBytes,
0
, plaintext,
0
, dataBytes.length);
SecretKeySpec keyspec =
new
SecretKeySpec(key.getBytes(),
"AES"
);
IvParameterSpec ivspec =
new
IvParameterSpec(iv.getBytes());
cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
byte
[] encrypted = cipher.doFinal(plaintext);
return
Base64Helper.encode(encrypted).trim();
}
catch
(Exception e) {
e.printStackTrace();
return
null
;
}
}
/**
* @author miracle.qu
* @see AES算法解密密文
* @param data 密文
* @param key 密鑰，長度16
* @param iv 偏移量，長度16
* @return 明文
*/
public
static
String decryptAES(String data,String key,String iv)
throws
Exception {
try
{
byte
[] encrypted1 = Base64Helper.decode(data);
Cipher cipher = Cipher.getInstance(
"AES/CBC/NoPadding"
);
SecretKeySpec keyspec =
new
SecretKeySpec(key.getBytes(),
"AES"
);
IvParameterSpec ivspec =
new
IvParameterSpec(iv.getBytes());
cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
byte
[] original = cipher.doFinal(encrypted1);
String originalString =
new
String(original);
return
originalString.trim();
}
catch
(Exception e) {
e.printStackTrace();
return
null
;
}
}
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其中Base64Helper類是個簡單的類，引用：
import org.apache.commons.codec.binary.Base64;
其中核心代碼：
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/**
* 編碼
* @param byteArray
* @return
*/
public
static
String encode(
byte
[] byteArray) {
return
new
String(
new
Base64().encode(byteArray));
}
/**
* 解碼
* @param base64EncodedString
* @return
*/
public
static
byte
[] decode(String base64EncodedString) {
return
new
Base64().decode(base64EncodedString);
}
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原文地址: https://blog.csdn.net/mr_qu/article/details/8433370