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分享2个Java转C#加密解密的算法
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内容图文
最近老是碰到和其他项目对接，对方项目采用JAVA,对于调用api时通常会 设计到对参数的加密解密。这时候就需要把对方的加密算法用C#实现一遍。
直接上代码。
Java
private static byte[] iv = {1,2,3,4,5,6,7,8};
public static String encryptDES(String encryptString, String encryptKey) throws Exception {
// IvParameterSpec zeroIv = new IvParameterSpec(new byte[8]);
IvParameterSpec zeroIv = new IvParameterSpec(iv);
SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes("utf-8"), "DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
byte[] encryptedData = cipher.doFinal(encryptString.getBytes("utf-8"));
return Base64_BAK.encode(encryptedData);
}
public static String decryptDES(String decryptString, String decryptKey) throws Exception {
byte[] byteMi = new Base64_BAK().decode(decryptString);
IvParameterSpec zeroIv = new IvParameterSpec(iv);
// IvParameterSpec zeroIv = new IvParameterSpec(new byte[8]);
SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes("utf-8"), "DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
byte decryptedData[] = cipher.doFinal(byteMi);
String retrdecryptedData = new String(decryptedData,"UTF-8");
return retrdecryptedData;
}
对字符进行编码的代码
class Base64_BAK {
private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
/**
* data[]进行编码
* @param data
* @return
*/
public static String encode(byte[] data) {
int start = 0;
int len = data.length;
StringBuffer buf = new StringBuffer(data.length * 3 / 2);
int end = len - 3;
int i = start;
int n = 0;
while (i <= end) {
int d = ((((int) data[i]) & 0x0ff) << 16)
| ((((int) data[i + 1]) & 0x0ff) << 8)
| (((int) data[i + 2]) & 0x0ff);
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append(legalChars[d & 63]);
i += 3;
if (n++ >= 14) {
n = 0;
buf.append(" ");
}
}
if (i == start + len - 2) {
int d = ((((int) data[i]) & 0x0ff) << 16)
| ((((int) data[i + 1]) & 255) << 8);
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append("=");
} else if (i == start + len - 1) {
int d = (((int) data[i]) & 0x0ff) << 16;
buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append("==");
}
return buf.toString();
}
private static int decode(char c) {
if (c >= ‘A‘ && c <= ‘Z‘)
return ((int) c) - 65;
else if (c >= ‘a‘ && c <= ‘z‘)
return ((int) c) - 97 + 26;
else if (c >= ‘0‘ && c <= ‘9‘)
return ((int) c) - 48 + 26 + 26;
else
switch (c) {
case ‘+‘:
return 62;
case ‘/‘:
return 63;
case ‘=‘:
return 0;
default:
throw new RuntimeException("unexpected code: " + c);
}
}
/**
* Decodes the given Base64 encoded String to a new byte array. The byte
* array holding the decoded data is returned.
*/
public static byte[] decode(String s) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
decode(s, bos);
} catch (IOException e) {
throw new RuntimeException();
}
byte[] decodedBytes = bos.toByteArray();
try {
bos.close();
bos = null;
} catch (IOException ex) {
System.err.println("Error while decoding BASE64: " + ex.toString());
}
return decodedBytes;
}
private static void decode(String s, OutputStream os) throws IOException {
int i = 0;
int len = s.length();
while (true) {
while (i < len && s.charAt(i) <= ‘ ‘)
i++;
if (i == len)
break;
int tri = (decode(s.charAt(i)) << 18)
+ (decode(s.charAt(i + 1)) << 12)
+ (decode(s.charAt(i + 2)) << 6)
+ (decode(s.charAt(i + 3)));
os.write((tri >> 16) & 255);
if (s.charAt(i + 2) == ‘=‘)
break;
os.write((tri >> 8) & 255);
if (s.charAt(i + 3) == ‘=‘)
break;
os.write(tri & 255);
i += 4;
}
}
对应的C#加密和解密算法如下
static String encode(byte[] data)
{
int start = 0;
int len = data.Length;
StringBuilder buf = new StringBuilder(data.Length * 3 / 2);
var legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".ToCharArray();
int end = len - 3;
int i = start;
int n = 0;
while (i <= end)
{
int d = ((((int)data[i]) & 0x0ff) << 16)
| ((((int)data[i + 1]) & 0x0ff) << 8)
| (((int)data[i + 2]) & 0x0ff);
buf.Append(legalChars[(d >> 18) & 63]);
buf.Append(legalChars[(d >> 12) & 63]);
buf.Append(legalChars[(d >> 6) & 63]);
buf.Append(legalChars[d & 63]);
i += 3;
if (n++ >= 14)
{
n = 0;
buf.Append(" ");
}
}
if (i == start + len - 2)
{
int d = ((((int)data[i]) & 0x0ff) << 16)
| ((((int)data[i + 1]) & 255) << 8);
buf.Append(legalChars[(d >> 18) & 63]);
buf.Append(legalChars[(d >> 12) & 63]);
buf.Append(legalChars[(d >> 6) & 63]);
buf.Append("=");
}
else if (i == start + len - 1)
{
int d = (((int)data[i]) & 0x0ff) << 16;
buf.Append(legalChars[(d >> 18) & 63]);
buf.Append(legalChars[(d >> 12) & 63]);
buf.Append("==");
}
return buf.ToString();
}
private static string Encrypt(string str, string sKey, byte[] iv)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.Default.GetBytes(str);
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);// 密匙
//byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };
des.IV = iv;// 初始化向量
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
var retB = encode(ms.ToArray());
return retB;
}
private static string Decrypt(string pToDecrypt, string sKey,byte[] iv)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
//byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = iv;
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
// 如果两次密匙不一样，这一步可能会引发异常
cs.FlushFinalBlock();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}
Java加密解密算法
public static String decryptDES(String decryptString, String decryptKey) throws Exception {
String afterDecryptString = null;
byte[] byteMi = new Base64().decode(decryptString);
try {
SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), "DES");
Cipher cipher = Cipher.getInstance("DES");
cipher.init(2, key);
byte[] decryptData = cipher.doFinal(byteMi);
afterDecryptString = new String(decryptData, "UTF-8");
} catch (Exception e) {
log.error("decryptDES error", e);
throw e;
}
return afterDecryptString;
}
C#代码
public static string Decrypt(string pToDecrypt, string sKey)
{
//var inputByteArray = ASCIIEncoding.ASCII.GetBytes(pToDecrypt);
byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) {
//des.Padding =PaddingMode.PKCS7;
des.Mode = CipherMode.ECB;
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return str;
}
}
原文：https://www.cnblogs.com/Playfunny/p/11428934.html
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