DES 加密 解密 iOS Android PHP

PHP代码 和 iOS 代码 摘自 http://blog.toright.com/posts/2657/ios-objective-c-與-php-des-加解密演算法實作.html

三个平台共用 一个密匙，尽量为8的倍数

1.php代码

<?php
/**
 * PHP DES 加密程式
 *
 * @param $key 密鑰（八個字元內）
 * @param $encrypt 要加密的明文
 * @return string 密文
 */
function encrypt ($key, $encrypt)
{
    // 根據 PKCS#7 RFC 5652 Cryptographic Message Syntax (CMS) 修正 Message 加入 Padding
    $block = mcrypt_get_block_size(MCRYPT_DES, MCRYPT_MODE_ECB);
    $pad = $block - (strlen($encrypt) % $block);
    $encrypt .= str_repeat(chr($pad), $pad);
 
    // 不需要設定 IV 進行加密
    $passcrypt = mcrypt_encrypt(MCRYPT_DES, $key, $encrypt, MCRYPT_MODE_ECB);
    return base64_encode($passcrypt);
}
 
/**
 * PHP DES 解密程式
 *
 * @param $key 密鑰（八個字元內）
 * @param $decrypt 要解密的密文
 * @return string 明文
 */
function decrypt ($key, $decrypt)
{
    // 不需要設定 IV
    $str = mcrypt_decrypt(MCRYPT_DES, $key, base64_decode($decrypt), MCRYPT_MODE_ECB);
 
    // 根據 PKCS#7 RFC 5652 Cryptographic Message Syntax (CMS) 修正 Message 移除 Padding
    $pad = ord($str[strlen($str) - 1]);
    return substr($str, 0, strlen($str) - $pad);
}
 
$key = "skey";
$plain = "0123ABCD!@#$中文";
$encrypt = encrypt($key, $plain);
$decrypt = decrypt($key, $encrypt);
 
echo "plain = " . $plain . "
";
echo "encrypt = " . $encrypt . "
";
echo "decrypt = " . $decrypt . "
";
?>

+(NSString*) decryptUseDES:(NSString*)cipherText key:(NSString*)key {
    // 利用 GTMBase64 解碼 Base64 字串
    
    NSData* cipherData = [cipherText base64DecodedData];
    unsigned char buffer[1024];
    memset(buffer, 0, sizeof(char));
    size_t numBytesDecrypted = 0;
    
    // IV 偏移量不需使用
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,
                                          kCCAlgorithmDES,
                                          kCCOptionPKCS7Padding | kCCOptionECBMode,
                                          [key UTF8String],
                                          kCCKeySizeDES,
                                          nil,
                                          [cipherData bytes],
                                          [cipherData length],
                                          buffer,
                                          1024,
                                          &numBytesDecrypted);
    NSString* plainText = nil;
    if (cryptStatus == kCCSuccess) {
        NSData* data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesDecrypted];
        plainText = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
    }
    return plainText;
}


+(NSString *) encryptUseDES:(NSString *)clearText key:(NSString *)key
{
    NSData *data = [clearText dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
    unsigned char buffer[1024];
    memset(buffer, 0, sizeof(char));
    size_t numBytesEncrypted = 0;
    
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
                                          kCCAlgorithmDES,
                                          kCCOptionPKCS7Padding | kCCOptionECBMode,
                                          [key UTF8String],
                                          kCCKeySizeDES,
                                          nil,
                                          [data bytes],
                                          [data length],
                                          buffer,
                                          1024,
                                          &numBytesEncrypted);
    
    NSString* plainText = nil;
    if (cryptStatus == kCCSuccess) {
        NSData *dataTemp = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
        plainText = [dataTemp base64EncodedString];
    }else{
//        NSLog(@"DES加密失败");
    }
    return plainText;
}

    // 密钥  如果 密匙不足 8个 字符  java代码 要加 <pre name="code" class="java">    //例如 secretKey = "xxxxxxx";

public class Des4 {
    // 密钥
    private final static String secretKey = "";
    private static byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0};

    public static String encode(String plainText) throws Exception {
        IvParameterSpec zeroIv = new IvParameterSpec(iv);
        SecretKeySpec key = new SecretKeySpec(secretKey.getBytes(), "DES");
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
        byte[] encryptedData = cipher.doFinal(plainText.getBytes());
        return Base64.encodeToString(encryptedData, 1);
    }

    public static String decode(String encryptText) throws Exception {
        IvParameterSpec zeroIv = new IvParameterSpec(iv);
        SecretKeySpec key = new SecretKeySpec(secretKey.getBytes(), "DES");
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
        byte[] decryptData = cipher.doFinal(Base64.decode(encryptText, 1));
        return new String(decryptData);
    }
}