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c加密java解密

發布時間:2023-06-09 20:03:52

❶ 求 java的C/S模式中 遠程數據傳輸的「加密、解密」技術

常用API
java.security.KeyPairGenerator 密鑰生成器類
public static KeyPairGenerator getInstance(String algorithm) throws NoSuchAlgorithmException
以指定的演算法返回一個KeyPairGenerator 對象
參數: algorithm 演算法名.如:"DSA","RSA"

public void initialize(int keysize)

以指定的長度初始化KeyPairGenerator對象,如果沒有初始化系統以1024長度默認設置

參數:keysize 演算法位長.其范圍必須在 512 到 1024 之間,且必須為 64 的倍數

public void initialize(int keysize, SecureRandom random)
以指定的長度初始化和隨機發生器初始化KeyPairGenerator對象
參數:keysize 演算法位長.其范圍必須在 512 到 1024 之間,且必須為 64 的倍數
random 一個隨機位的來源(對於initialize(int keysize)使用了默認隨機器

public abstract KeyPair generateKeyPair()
產生新密鑰對

java.security.KeyPair 密鑰對類
public PrivateKey getPrivate()
返回私鑰

public PublicKey getPublic()
返回公鑰

java.security.Signature 簽名類
public static Signature getInstance(String algorithm) throws NoSuchAlgorithmException
返回一個指定演算法的Signature對象
參數 algorithm 如:"DSA"

public final void initSign(PrivateKey privateKey)
throws InvalidKeyException
用指定的私鑰初始化
參數:privateKey 所進行簽名時用的私鑰

public final void update(byte data)
throws SignatureException
public final void update(byte[] data)
throws SignatureException
public final void update(byte[] data, int off, int len)
throws SignatureException
添加要簽名的信息

public final byte[] sign()
throws SignatureException
返回簽名的數組,前提是initSign和update

public final void initVerify(PublicKey publicKey)
throws InvalidKeyException
用指定的公鑰初始化
參數:publicKey 驗證時用的公鑰

public final boolean verify(byte[] signature)
throws SignatureException
驗證簽名是否有效,前提是已initVerify初始化
參數: signature 簽名數組

❷ C#加密Java解密

DES加密 java與 C# 可以相互加密解密
這里的KEY採用Base64編碼,便用分發,因為Java的Byte范圍為-128至127,c#的Byte范圍是0-255
核心是確定Mode和Padding,關於這兩個的意思可以搜索3DES演算法相關文章
一個是C#採用CBC Mode,PKCS7 Padding,Java採用CBC Mode,PKCS5Padding Padding,
另一個是C#採用ECB Mode,PKCS7 Padding,Java採用ECB Mode,PKCS5Padding Padding,
Java的ECB模式不需要IV
對字元加密時,雙方採用的都是UTF-8編碼
C# 代碼

/// <summary>
/// DES3加密解密
/// </summary>
public class Des3
{
#region CBC模式**
/// <summary>
/// DES3 CBC模式加密
/// </summary>
/// <param name="key">密鑰</param>
/// <param name="iv">IV</param>
/// <param name="data">明文的byte數組</param>
/// <returns>密文的byte數組</returns>
public static byte[] Des3EncodeCBC( byte[] key, byte[] iv, byte[] data )
{
//復制於MSDN
try
{
// Create a MemoryStream.
MemoryStream mStream = new MemoryStream();
tdsp = new ();
tdsp.Mode = CipherMode.CBC; //默認值
tdsp.Padding = PaddingMode.PKCS7; //默認值
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream( mStream,
tdsp.CreateEncryptor( key, iv ),
CryptoStreamMode.Write );
// Write the byte array to the crypto stream and flush it.
cStream.Write( data, 0, data.Length );
cStream.FlushFinalBlock();
// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
byte[] ret = mStream.ToArray();
// Close the streams.
cStream.Close();
mStream.Close();
// Return the encrypted buffer.
return ret;
}
catch ( CryptographicException e )
{
Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message );
return null;
}
}
/// <summary>
/// DES3 CBC模式解密
/// </summary>
/// <param name="key">密鑰</param>
/// <param name="iv">IV</param>
/// <param name="data">密文的byte數組</param>
/// <returns>明文的byte數組</returns>
public static byte[] Des3DecodeCBC( byte[] key, byte[] iv, byte[] data )
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream msDecrypt = new MemoryStream( data );
tdsp = new ();
tdsp.Mode = CipherMode.CBC;
tdsp.Padding = PaddingMode.PKCS7;
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream csDecrypt = new CryptoStream( msDecrypt,
tdsp.CreateDecryptor( key, iv ),
CryptoStreamMode.Read );
// Create buffer to hold the decrypted data.
byte[] fromEncrypt = new byte[data.Length];
// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
csDecrypt.Read( fromEncrypt, 0, fromEncrypt.Length );
//Convert the buffer into a string and return it.
return fromEncrypt;
}
catch ( CryptographicException e )
{
Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message );
return null;
}
}
#endregion
#region ECB模式
/// <summary>
/// DES3 ECB模式加密
/// </summary>
/// <param name="key">密鑰</param>
/// <param name="iv">IV(當模式為ECB時,IV無用)</param>
/// <param name="str">明文的byte數組</param>
/// <returns>密文的byte數組</returns>
public static byte[] Des3EncodeECB( byte[] key, byte[] iv, byte[] data )
{
try
{
// Create a MemoryStream.
MemoryStream mStream = new MemoryStream();
tdsp = new ();
tdsp.Mode = CipherMode.ECB;
tdsp.Padding = PaddingMode.PKCS7;
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream( mStream,
tdsp.CreateEncryptor( key, iv ),
CryptoStreamMode.Write );
// Write the byte array to the crypto stream and flush it.
cStream.Write( data, 0, data.Length );
cStream.FlushFinalBlock();
// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
byte[] ret = mStream.ToArray();
// Close the streams.
cStream.Close();
mStream.Close();
// Return the encrypted buffer.
return ret;
}
catch ( CryptographicException e )
{
Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message );
return null;
}
}
/// <summary>
/// DES3 ECB模式解密
/// </summary>
/// <param name="key">密鑰</param>
/// <param name="iv">IV(當模式為ECB時,IV無用)</param>
/// <param name="str">密文的byte數組</param>
/// <returns>明文的byte數組</returns>
public static byte[] Des3DecodeECB( byte[] key, byte[] iv, byte[] data )
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream msDecrypt = new MemoryStream( data );
tdsp = new ();
tdsp.Mode = CipherMode.ECB;
tdsp.Padding = PaddingMode.PKCS7;
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream csDecrypt = new CryptoStream( msDecrypt,
tdsp.CreateDecryptor( key, iv ),
CryptoStreamMode.Read );
// Create buffer to hold the decrypted data.
byte[] fromEncrypt = new byte[data.Length];
// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
csDecrypt.Read( fromEncrypt, 0, fromEncrypt.Length );
//Convert the buffer into a string and return it.
return fromEncrypt;
}
catch ( CryptographicException e )
{
Console.WriteLine( "A Cryptographic error occurred: {0}", e.Message );
return null;
}
}
#endregion
/// <summary>
/// 類測試
/// </summary>
public static void Test()
{
System.Text.Encoding utf8 = System.Text.Encoding.UTF8;
//key為abcdefghijklmnopqrstuvwx的Base64編碼
byte[] key = Convert.FromBase64String( "" );
byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; //當模式為ECB時,IV無用
byte[] data = utf8.GetBytes( "中國ABCabc123" );
System.Console.WriteLine( "ECB模式:" );
byte[] str1 = Des3.Des3EncodeECB( key, iv, data );
byte[] str2 = Des3.Des3DecodeECB( key, iv, str1 );
System.Console.WriteLine( Convert.ToBase64String( str1 ) );
System.Console.WriteLine( System.Text.Encoding.UTF8.GetString( str2 ) );
System.Console.WriteLine();
System.Console.WriteLine( "CBC模式:" );
byte[] str3 = Des3.Des3EncodeCBC( key, iv, data );
byte[] str4 = Des3.Des3DecodeCBC( key, iv, str3 );
System.Console.WriteLine( Convert.ToBase64String( str3 ) );
System.Console.WriteLine( utf8.GetString( str4 ) );
System.Console.WriteLine();
}
}
java 代碼:
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class Des3 {
public static void main(String[] args) throws Exception {
byte[] key=new BASE64Decoder().decodeBuffer("");
byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 };
byte[] data="中國ABCabc123".getBytes("UTF-8");

System.out.println("ECB加密解密");
byte[] str3 = des3EncodeECB(key,data );
byte[] str4 = ees3DecodeECB(key, str3);
System.out.println(new BASE64Encoder().encode(str3));
System.out.println(new String(str4, "UTF-8"));
System.out.println();
System.out.println("CBC加密解密");
byte[] str5 = des3EncodeCBC(key, keyiv, data);
byte[] str6 = des3DecodeCBC(key, keyiv, str5);
System.out.println(new BASE64Encoder().encode(str5));
System.out.println(new String(str6, "UTF-8"));
}
/**
* ECB加密,不要IV
* @param key 密鑰
* @param data 明文
* @return Base64編碼的密文
* @throws Exception
*/
public static byte[] des3EncodeECB(byte[] key, byte[] data)
throws Exception {
Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(key);
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, deskey);
byte[] bOut = cipher.doFinal(data);
return bOut;
}
/**
* ECB解密,不要IV
* @param key 密鑰
* @param data Base64編碼的密文
* @return 明文
* @throws Exception
*/
public static byte[] ees3DecodeECB(byte[] key, byte[] data)
throws Exception {
Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(key);
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, deskey);
byte[] bOut = cipher.doFinal(data);
return bOut;
}
/**
* CBC加密
* @param key 密鑰
* @param keyiv IV
* @param data 明文
* @return Base64編碼的密文
* @throws Exception
*/
public static byte[] des3EncodeCBC(byte[] key, byte[] keyiv, byte[] data)
throws Exception {
Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(key);
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(keyiv);
cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
byte[] bOut = cipher.doFinal(data);
return bOut;
}
/**
* CBC解密
* @param key 密鑰
* @param keyiv IV
* @param data Base64編碼的密文
* @return 明文
* @throws Exception
*/
public static byte[] des3DecodeCBC(byte[] key, byte[] keyiv, byte[] data)
throws Exception {
Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(key);
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);
Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(keyiv);
cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
byte[] bOut = cipher.doFinal(data);
return bOut;
}
}

❸ Des加密解密方法 用java C#和C++三種方式實現

Solaris下的系統,有一個用C做的加密工具,調用Sunwcry的des(1)對文件進行加密,然後在java中對文件進行解密。java中用的是標準的DES/CBC/NoPadding演算法,可是解密後發現開頭有8byte的數據出錯了,請高人指點一下。

cbc_encrypt.c : 加密用的C程序

cbc_decrypt.c:解密用的C程序

TestDescbc.java:解密用的java程序

Test01.dat原始文件
Test03.dat cbc_encrypt加密後的文件
Test05.dat cbc_decrypt解密後的文件

Test06.dat TestDescbc解密後的文件

❹ java密碼加密與解密

以下兩個類可以很方便的完成字元串的加密和解密

加密 CryptHelper encrypt(password)

解密 CrypHelper decrypt(password)

代碼如下

CryptUtils java

[java]

package gdie lab crypt;

import java io IOException;

import javax crypto Cipher;

import javax crypto KeyGenerator;

import javax crypto SecretKey;

import apache xerces internal impl dv util Base ;

public class CryptUtils {

private static String Algorithm = DES ;

private static byte[] DEFAULT_KEY=new byte[] { };

private static String VALUE_ENCODING= UTF ;

/**

* 生成密鑰

*

* @return byte[] 返回生成的密鑰

* @throws exception

* 扔出異常

*/

public static byte[] getSecretKey() throws Exception {

KeyGenerator keygen = KeyGenerator getInstance(Algorithm)

SecretKey deskey = keygen generateKey()

// if (debug ) System out println ( 生成密鑰 +byte hex (deskey getEncoded

// ()))

return deskey getEncoded()

}

/**

* 將指定的數據根據提供的密鑰進行加密

*

* @param input

* 需要加密的數據

* @param key

* 密鑰

* @return byte[] 加密後的數據

* @throws Exception

*/

public static byte[] encryptData(byte[] input byte[] key) throws Exception {

SecretKey deskey = new javax crypto spec SecretKeySpec(key Algorithm)

// if (debug )

// {

// System out println ( 加密前的二進串 +byte hex (input ))

// System out println ( 加密前的字元串 +new String (input ))

//

// }

Cipher c = Cipher getInstance(Algorithm)

c init(Cipher ENCRYPT_MODE deskey)

byte[] cipherByte = c doFinal(input)

// if (debug ) System out println ( 加密後的二進串 +byte hex (cipherByte ))

return cipherByte;

}

public static byte[] encryptData(byte[] input) throws Exception {

return encryptData(input DEFAULT_KEY)

}

/**

* 將給定的已加密的數據通過指定的密鑰進行解密

*

* @param input

* 待解密的數據

* @param key

* 密鑰

* @return byte[] 解密後的數據

* @throws Exception

*/

public static byte[] decryptData(byte[] input byte[] key) throws Exception {

SecretKey deskey = new javax crypto spec SecretKeySpec(key Algorithm)

// if (debug ) System out println ( 解密前的信息 +byte hex (input ))

Cipher c = Cipher getInstance(Algorithm)

c init(Cipher DECRYPT_MODE deskey)

byte[] clearByte = c doFinal(input)

// if (debug )

// {

// System out println ( 解密後的二進串 +byte hex (clearByte ))

// System out println ( 解密後的字元串 +(new String (clearByte )))

//

// }

return clearByte;

}

public static byte[] decryptData(byte[] input) throws Exception {

return decryptData(input DEFAULT_KEY)

}

/**

* 位元組碼轉換成 進制字元串

*

* @param byte[] b 輸入要轉換的位元組碼

* @return String 返回轉換後的 進制字元串

*/

public static String byte hex(byte[] bytes) {

StringBuilder hs = new StringBuilder()

for(byte b : bytes)

hs append(String format( % $ X b))

return hs toString()

}

public static byte[] hex byte(String content) {

int l=content length()》 ;

byte[] result=new byte[l];

for(int i= ;i<l;i++) {

int j=i《 ;

String s=content substring(j j+ )

result[i]=Integer valueOf(s ) byteValue()

}

return result;

}

/**

* 將位元組數組轉換為base 編碼字元串

* @param buffer

* @return

*/

public static String bytesToBase (byte[] buffer) {

//BASE Encoder en=new BASE Encoder()

return Base encode(buffer)

// return encoder encode(buffer)

}

/**

* 將base 編碼的字元串解碼為位元組數組

* @param value

* @return

* @throws IOException

*/

public static byte[] base ToBytes(String value) throws IOException {

//return Base decodeToByteArray(value)

// System out println(decoder decodeBuffer(value))

// return decoder decodeBuffer(value)

return Base decode(value)

}

/**

* 加密給定的字元串

* @param value

* @return 加密後的base 字元串

*/

public static String encryptString(String value) {

return encryptString(value DEFAULT_KEY)

}

/**

* 根據給定的密鑰加密字元串

* @param value 待加密的字元串

* @param key 以BASE 形式存在的密鑰

* @return 加密後的base 字元串

* @throws IOException

*/

public static String encryptString(String value String key) throws IOException {

return encryptString(value base ToBytes(key))

}

/**

* 根據給定的密鑰加密字元串

* @param value 待加密的字元串

* @param key 位元組數組形式的密鑰

* @return 加密後的base 字元串

*/

public static String encryptString(String value byte[] key) {

try {

byte[] data=value getBytes(VALUE_ENCODING)

data=CryptUtils encryptData(data key)

return bytesToBase (data)

} catch (Exception e) {

// TODO Auto generated catch block

e printStackTrace()

return null;

}

}

/**

* 解密字元串

* @param value base 形式存在的密文

* @return 明文

*/

public static String decryptString(String value) {

return decryptString(value DEFAULT_KEY)

}

/**

* 解密字元串

* @param value base 形式存在的密文

* @param key base 形式存在的密鑰

* @return 明文

* @throws IOException

*/

public static String decryptString(String value String key) throws IOException {

String s=decryptString(value base ToBytes(key))

return s;

}

/**

* 解密字元串

* @param value base 形式存在的密文

* @param key 位元組數據形式存在的密鑰

* @return 明文

*/

public static String decryptString(String value byte[] key) {

try {

byte[] data=base ToBytes(value)

data=CryptUtils decryptData(data key)

return new String(data VALUE_ENCODING)

}catch(Exception e) {

e printStackTrace()

return null;

}

}

}

package gdie lab crypt;

import java io IOException;

import javax crypto Cipher;

import javax crypto KeyGenerator;

import javax crypto SecretKey;

import apache xerces internal impl dv util Base ;

public class CryptUtils {

private static String Algorithm = DES ;

private static byte[] DEFAULT_KEY=new byte[] { };

private static String VALUE_ENCODING= UTF ;

/**

* 生成密鑰

*

* @return byte[] 返回生成的密鑰

* @throws exception

* 扔出異常

*/

public static byte[] getSecretKey() throws Exception {

KeyGenerator keygen = KeyGenerator getInstance(Algorithm)

SecretKey deskey = keygen generateKey()

// if (debug ) System out println ( 生成密鑰 +byte hex (deskey getEncoded

// ()))

return deskey getEncoded()

}

/**

* 將指定的數據根據提供的密鑰進行加密

*

* @param input

* 需要加密的數據

* @param key

* 密鑰

* @return byte[] 加密後的數據

* @throws Exception

*/

public static byte[] encryptData(byte[] input byte[] key) throws Exception {

SecretKey deskey = new javax crypto spec SecretKeySpec(key Algorithm)

// if (debug )

// {

// System out println ( 加密前的二進串 +byte hex (input ))

// System out println ( 加密前的字元串 +new String (input ))

//

// }

Cipher c = Cipher getInstance(Algorithm)

c init(Cipher ENCRYPT_MODE deskey)

byte[] cipherByte = c doFinal(input)

// if (debug ) System out println ( 加密後的二進串 +byte hex (cipherByte ))

return cipherByte;

}

public static byte[] encryptData(byte[] input) throws Exception {

return encryptData(input DEFAULT_KEY)

}

/**

* 將給定的已加密的數據通過指定的密鑰進行解密

*

* @param input

* 待解密的數據

* @param key

* 密鑰

* @return byte[] 解密後的數據

* @throws Exception

*/

public static byte[] decryptData(byte[] input byte[] key) throws Exception {

SecretKey deskey = new javax crypto spec SecretKeySpec(key Algorithm)

// if (debug ) System out println ( 解密前的信息 +byte hex (input ))

Cipher c = Cipher getInstance(Algorithm)

c init(Cipher DECRYPT_MODE deskey)

byte[] clearByte = c doFinal(input)

// if (debug )

// {

// System out println ( 解密後的二進串 +byte hex (clearByte ))

// System out println ( 解密後的字元串 +(new String (clearByte )))

//

// }

return clearByte;

}

public static byte[] decryptData(byte[] input) throws Exception {

return decryptData(input DEFAULT_KEY)

}

/**

* 位元組碼轉換成 進制字元串

*

* @param byte[] b 輸入要轉換的位元組碼

* @return String 返回轉換後的 進制字元串

*/

public static String byte hex(byte[] bytes) {

StringBuilder hs = new StringBuilder()

for(byte b : bytes)

hs append(String format( % $ X b))

return hs toString()

}

public static byte[] hex byte(String content) {

int l=content length()》 ;

byte[] result=new byte[l];

for(int i= ;i<l;i++) {

int j=i《 ;

String s=content substring(j j+ )

result[i]=Integer valueOf(s ) byteValue()

}

return result;

}

/**

* 將位元組數組轉換為base 編碼字元串

* @param buffer

* @return

*/

public static String bytesToBase (byte[] buffer) {

//BASE Encoder en=new BASE Encoder()

return Base encode(buffer)

// return encoder encode(buffer)

}

/**

* 將base 編碼的字元串解碼為位元組數組

* @param value

* @return

* @throws IOException

*/

public static byte[] base ToBytes(String value) throws IOException {

//return Base decodeToByteArray(value)

// System out println(decoder decodeBuffer(value))

// return decoder decodeBuffer(value)

return Base decode(value)

}

/**

* 加密給定的字元串

* @param value

* @return 加密後的base 字元串

*/

public static String encryptString(String value) {

return encryptString(value DEFAULT_KEY)

}

/**

* 根據給定的密鑰加密字元串

* @param value 待加密的字元串

* @param key 以BASE 形式存在的密鑰

* @return 加密後的base 字元串

* @throws IOException

*/

public static String encryptString(String value String key) throws IOException {

return encryptString(value base ToBytes(key))

}

/**

* 根據給定的密鑰加密字元串

* @param value 待加密的字元串

* @param key 位元組數組形式的密鑰

* @return 加密後的base 字元串

*/

public static String encryptString(String value byte[] key) {

try {

byte[] data=value getBytes(VALUE_ENCODING)

data=CryptUtils encryptData(data key)

return bytesToBase (data)

} catch (Exception e) {

// TODO Auto generated catch block

e printStackTrace()

return null;

}

}

/**

* 解密字元串

* @param value base 形式存在的密文

* @return 明文

*/

public static String decryptString(String value) {

return decryptString(value DEFAULT_KEY)

}

/**

* 解密字元串

* @param value base 形式存在的密文

* @param key base 形式存在的密鑰

* @return 明文

* @throws IOException

*/

public static String decryptString(String value String key) throws IOException {

String s=decryptString(value base ToBytes(key))

return s;

}

/**

* 解密字元串

* @param value base 形式存在的密文

* @param key 位元組數據形式存在的密鑰

* @return 明文

*/

public static String decryptString(String value byte[] key) {

try {

byte[] data=base ToBytes(value)

data=CryptUtils decryptData(data key)

return new String(data VALUE_ENCODING)

}catch(Exception e) {

e printStackTrace()

return null;

}

}

}

CryptHelper java

[java]

package gdie lab crypt;

import javax crypto Cipher;

import javax crypto SecretKey;

import javax crypto SecretKeyFactory;

import javax crypto spec DESKeySpec;

import javax crypto spec IvParameterSpec;

import springframework util DigestUtils;

public class CryptHelper{

private static String CRYPT_KEY = zhongqian ;

//加密

private static Cipher ecip;

//解密

private static Cipher dcip;

static {

try {

String KEY = DigestUtils md DigestAsHex(CRYPT_KEY getBytes()) toUpperCase()

KEY = KEY substring( )

byte[] bytes = KEY getBytes()

DESKeySpec ks = new DESKeySpec(bytes)

SecretKeyFactory skf = SecretKeyFactory getInstance( DES )

SecretKey sk = skf generateSecret(ks)

IvParameterSpec iv = new IvParameterSpec(bytes)

ecip = Cipher getInstance( DES/CBC/PKCS Padding )

ecip init(Cipher ENCRYPT_MODE sk iv )

dcip = Cipher getInstance( DES/CBC/PKCS Padding )

dcip init(Cipher DECRYPT_MODE sk iv )

}catch(Exception ex) {

ex printStackTrace()

}

}

public static String encrypt(String content) throws Exception {

byte[] bytes = ecip doFinal(content getBytes( ascii ))

return CryptUtils byte hex(bytes)

}

public static String decrypt(String content) throws Exception {

byte[] bytes = CryptUtils hex byte(content)

bytes = dcip doFinal(bytes)

return new String(bytes ascii )

}

//test

public static void main(String[] args) throws Exception {

String password = gly ;

String en = encrypt(password)

System out println(en)

System out println(decrypt(en))

}

}

package gdie lab crypt;

import javax crypto Cipher;

import javax crypto SecretKey;

import javax crypto SecretKeyFactory;

import javax crypto spec DESKeySpec;

import javax crypto spec IvParameterSpec;

import springframework util DigestUtils;

public class CryptHelper{

private static String CRYPT_KEY = zhongqian ;

//加密

private static Cipher ecip;

//解密

private static Cipher dcip;

static {

try {

String KEY = DigestUtils md DigestAsHex(CRYPT_KEY getBytes()) toUpperCase()

KEY = KEY substring( )

byte[] bytes = KEY getBytes()

DESKeySpec ks = new DESKeySpec(bytes)

SecretKeyFactory skf = SecretKeyFactory getInstance( DES )

SecretKey sk = skf generateSecret(ks)

IvParameterSpec iv = new IvParameterSpec(bytes)

ecip = Cipher getInstance( DES/CBC/PKCS Padding )

ecip init(Cipher ENCRYPT_MODE sk iv )

dcip = Cipher getInstance( DES/CBC/PKCS Padding )

dcip init(Cipher DECRYPT_MODE sk iv )

}catch(Exception ex) {

ex printStackTrace()

}

}

public static String encrypt(String content) throws Exception {

byte[] bytes = ecip doFinal(content getBytes( ascii ))

return CryptUtils byte hex(bytes)

}

public static String decrypt(String content) throws Exception {

byte[] bytes = CryptUtils hex byte(content)

bytes = dcip doFinal(bytes)

return new String(bytes ascii )

}

//test

public static void main(String[] args) throws Exception {

String password = gly ;

String en = encrypt(password)

System out println(en)

System out println(decrypt(en))

}

lishixin/Article/program/Java/hx/201311/26449

❺ Java生成的RSA密鑰對,用C#加密解密,怎麼弄

http://davenzeng.blog.51cto.com/3896952/989634看下這個對你有沒有幫助

❻ 如題,求Java的DES演算法代碼,可以用於解密用C語言寫的DES加密演算法!其中C語言代碼見問題補充

俺就是來幫助你這樣可愛的人。俺可是花了幾年的時間費了多大的力氣才能把這個東西弄出來!

DES加密還沒有AES嚴密:

packagecom.palic.pss.afcs.worldthrough.common.util;
importjavax.crypto.Cipher;
importjavax.crypto.spec.SecretKeySpec;
importrepack.com.thoughtworks.xstream.core.util.Base64Encoder;
/**
*AES加密解密
*@author
*
*/
publicclassAesUtils{
publicstaticfinalStringcKey="assistant7654321";
/**
*加密--把加密後的byte數組先進行二進制轉16進制在進行base64編碼
*@paramsSrc
*@paramsKey
*@return
*@throwsException
*/
publicstaticStringencrypt(StringsSrc,StringsKey)throwsException{
if(sKey==null){
("ArgumentsKeyisnull.");
}
if(sKey.length()!=16){
(
"ArgumentsKey'lengthisnot16.");
}
byte[]raw=sKey.getBytes("ASCII");
SecretKeySpecskeySpec=newSecretKeySpec(raw,"AES");

Ciphercipher=Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE,skeySpec);

byte[]encrypted=cipher.doFinal(sSrc.getBytes("UTF-8"));
StringtempStr=parseByte2HexStr(encrypted);

Base64Encoderencoder=newBase64Encoder();
returnencoder.encode(tempStr.getBytes("UTF-8"));
}

/**
*解密--先進行base64解碼,在進行16進制轉為2進制然後再解碼
*@paramsSrc
*@paramsKey
*@return
*@throwsException
*/
publicstaticStringdecrypt(StringsSrc,StringsKey)throwsException{

if(sKey==null){
("499");
}
if(sKey.length()!=16){
("498");
}

byte[]raw=sKey.getBytes("ASCII");
SecretKeySpecskeySpec=newSecretKeySpec(raw,"AES");

Ciphercipher=Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE,skeySpec);

Base64Encoderencoder=newBase64Encoder();
byte[]encrypted1=encoder.decode(sSrc);

StringtempStr=newString(encrypted1,"utf-8");
encrypted1=parseHexStr2Byte(tempStr);
byte[]original=cipher.doFinal(encrypted1);
StringoriginalString=newString(original,"utf-8");
returnoriginalString;
}

/**
*將二進制轉換成16進制
*
*@parambuf
*@return
*/
(bytebuf[]){
StringBuffersb=newStringBuffer();
for(inti=0;i<buf.length;i++){
Stringhex=Integer.toHexString(buf[i]&0xFF);
if(hex.length()==1){
hex='0'+hex;
}
sb.append(hex.toUpperCase());
}
returnsb.toString();
}

/**
*將16進制轉換為二進制
*
*@paramhexStr
*@return
*/
publicstaticbyte[]parseHexStr2Byte(StringhexStr){
if(hexStr.length()<1)
returnnull;
byte[]result=newbyte[hexStr.length()/2];
for(inti=0;i<hexStr.length()/2;i++){
inthigh=Integer.parseInt(hexStr.substring(i*2,i*2+1),16);
intlow=Integer.parseInt(hexStr.substring(i*2+1,i*2+2),
16);
result[i]=(byte)(high*16+low);
}
returnresult;
}
publicstaticvoidmain(String[]args)throwsException{
/*
*加密用的Key可以用26個字母和數字組成,最好不要用保留字元,雖然不會錯,至於怎麼裁決,個人看情況而定
*/
StringcKey="assistant7654321";
//需要加密的字串
StringcSrc="123456";
//加密
longlStart=System.currentTimeMillis();
StringenString=encrypt(cSrc,cKey);
System.out.println("加密後的字串是:"+enString);
longlUseTime=System.currentTimeMillis()-lStart;
System.out.println("加密耗時:"+lUseTime+"毫秒");
//解密
lStart=System.currentTimeMillis();
StringDeString=decrypt(enString,cKey);
System.out.println("解密後的字串是:"+DeString);
lUseTime=System.currentTimeMillis()-lStart;
System.out.println("解密耗時:"+lUseTime+"毫秒");
}
}

❼ des解密演算法,利用C語言解密JAVA語言加密的密碼。。密鑰為12345678,加密後的密文為:26d086be3a3a62fc

// C 語言 DES用的是 ECB模式, 沒有填充
// 因此Java端要對應, 你的明文是 liubiao 嗎?
// 另外 DES已經不安全了, 如果可以改為 3DES或者 AES吧。
public class LearnDes {

public static void main(String[] args) {
try {
System.out.println(encrypt("liubiao", "12345678"));

System.out.println(decrypt("26d086be3a3a62fc", "12345678"));
} catch (Exception e) {
e.printStackTrace();
}
}
public static String encrypt(String message, String key) throws Exception {
//Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
Cipher cipher = Cipher.getInstance("DES/ECB/NOPADDING");

DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
//cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
cipher.init(Cipher.ENCRYPT_MODE, secretKey );

return toHexString(cipher.doFinal(message.getBytes("UTF-8")));
}

public static String decrypt(String message, String key) throws Exception {

byte[] bytesrc = convertHexString(message);

//Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
Cipher cipher = Cipher.getInstance("DES/ECB/NOPADDING");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

//cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
cipher.init(Cipher.DECRYPT_MODE, secretKey );

byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte);
}

public static byte[] convertHexString(String ss) {
byte digest[] = new byte[ss.length() / 2];
for (int i = 0; i < digest.length; i++) {
String byteString = ss.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(byteString, 16);
digest[i] = (byte) byteValue;
}

return digest;
}
public static String toHexString(byte b[]) {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < b.length; i++) {
String plainText = Integer.toHexString(0xff & b[i]);
if (plainText.length() < 2)
plainText = "0" + plainText;
hexString.append(plainText);
}

return hexString.toString();
}
}

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