轉來的–>原文地址
用到裡面的iOS和java是OK的。

java：

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


public class Encryption {

    static final String key = "20140401";
    static final String iv = "12345678";

    public static void main(String[] args) {
        try
 
 {
            System.out.println(decryptDES("FbWfZtyPPOY="));
            System.out.println(encryptDES("gitsea"));
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static String encryptDES(String encryptString)
            throws
 
 Exception {
        IvParameterSpec zeroIv = new IvParameterSpec(iv.getBytes());
        SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "DES");
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, skey, zeroIv);
        byte[] encryptedData = cipher.doFinal(encryptString.getBytes());

        return
 
 Base64.encode(encryptedData);
    }

    public static String decryptDES(String decryptString)
            throws Exception {
        byte[] byteMi = Base64.decode(decryptString);
        IvParameterSpec zeroIv = new IvParameterSpec(iv.getBytes());
        SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "DES");
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, skey, zeroIv);
        byte decryptedData[] = cipher.doFinal(byteMi);
        return new String(decryptedData);
    }
}

OC：

#import "Encrypt.h"
#import "Base64.h"
#import "CommonCrypto/CommonDigest.h"
#import "CommonCrypto/CommonCryptor.h"

@implementation Encrypt

const NSString *key = @"20140401";
const NSString *iv = @"12345678";

+(NSString *) encryptUseDES:(NSString *)plainText
{
    NSData* ivData = [iv dataUsingEncoding: NSUTF8StringEncoding];
    Byte *ivBytes = (Byte *)[ivData bytes];
    NSString *ciphertext = nil;
    NSData *textData = [plainText dataUsingEncoding:NSUTF8StringEncoding];
    NSUInteger dataLength = [textData length];
    unsigned char buffer[1024];
    memset(buffer, 0, sizeof(char));
    size_t numBytesEncrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,
                                          kCCOptionPKCS7Padding,
                                          [key UTF8String], kCCKeySizeDES,
                                          ivBytes,
                                          [textData bytes], dataLength,
                                          buffer, 1024,
                                          &numBytesEncrypted);
    if (cryptStatus == kCCSuccess) {
        NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
        ciphertext = [Base64 encode:data];
    }
    return ciphertext;
}

+(NSString *)decryptUseDES:(NSString *)cipherText
{
    NSData* ivData = [iv dataUsingEncoding: NSUTF8StringEncoding];
    Byte *ivBytes = (Byte *)[ivData bytes];
    NSString *plaintext = nil;
    NSData *cipherdata = [Base64 decode:cipherText];
    unsigned char buffer[1024];
    memset(buffer, 0, sizeof(char));
    size_t numBytesDecrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,kCCAlgorithmDES,kCCOptionPKCS7Padding,[key UTF8String], kCCKeySizeDES,ivBytes,[cipherdata bytes],[cipherdata length],buffer, 1024,&numBytesDecrypted);
    if(cryptStatus == kCCSuccess) {
        NSData *plaindata = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesDecrypted];
        plaintext = [[NSString alloc]initWithData:plaindata encoding:NSUTF8StringEncoding];
    }
    return plaintext;
}
@end

PHP:

<?php
class DES {
    var $key;
    var $iv;
    function __construct($key,$iv) {
        $this->key = $key;
        $this->iv = $iv;
    }


/**加密*/
    function encrypt($str) {
        $size = mcrypt_get_block_size(MCRYPT_DES, MCRYPT_MODE_CBC);
        $str = $this->pkcs5Pad($str, $size);

        $data = mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv);
        return base64_encode($data);
    }


/**解密*/
    function decrypt($str) {
        $str = base64_decode($str);
        $str = mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_DECRYPT, $this->iv);
        $str = $this->pkcs5Unpad($str);
        return $str;
    }
    function pkcs5Pad($text, $blocksize) {
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text . str_repeat(chr($pad), $pad);
    }
    function pkcs5Unpad($text) {
        $pad = ord($text{strlen($text) - 1});
        if ($pad > strlen($text)) return false;
        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
        return substr($text, 0, -1 * $pad);
    }
}
global $AES_KEY;
global $AES_IV;
$AES_KEY ="20140401";
$AES_IV = "12345678";
$MyDes = new DES($AES_KEY,$AES_IV);

java的base64,跟iOS的foundation裡面的base64方法一致：

package des2;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
public class Base64 {
    private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
            .toCharArray();
    /**
     * data[]進行編碼
     * 
     * @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();
    }
    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;
        }
    }
    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);
            }
    }
}