objecive-c java EDS加密 大综合

      在做一个前后台的项目,前台iOS 和 安卓 后台用JAVA作为服务器,需要用DES加密传输字符串,在网上搜罗了一下,综合各家所长集成到一个项目。贴上核心代码,具体代码我稍后上传

     JAVA DES核心类     

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

public class DESUtil {
	private static final byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };

	public static String encryptDES(String encryptString, String encryptKey)
			throws Exception {
		IvParameterSpec zeroIv = new IvParameterSpec(iv);
		SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
		Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
		byte[] encryptedData = cipher.doFinal(encryptString.getBytes());
		return Base64.encode(encryptedData);
	}

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

		return new String(decryptedData);
	}
	
	
	public static void main(String[] args) {
		 try {
			 
			 String plaintext = "@+-@#¥%……&*()——\"";
			 String ciphertext = DESUtil.encryptDES(plaintext, "20120401");
			 System.out.println("明文:" + plaintext);
			 System.out.println("密钥:" + "20120401");
			 System.out.println("密文:" + ciphertext);
			 System.out.println("解密后:" + DESUtil.decryptDES(ciphertext, "20120401"));
		
		 } catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
	
}
BASE64

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class Base64 {
	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();
	}

	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);
			}
	}
}

objective-c 核心类

#import "EncryptUtil.h"
#import "CommonCrypto/CommonCryptor.h"
#import "NSData+base64.h"
#import "GTMDefines.h"
#import "GTMBase64.h"

@implementation EncryptUtil

+ (NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key
{
    const Byte iv[] = {1,2,3,4,5,6,7,8};
    
    NSString *ciphertext = nil;
//    const char *textBytes = [plainText UTF8String];
//    NSUInteger dataLength = [plainText length];
    
    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,
                                          iv,
                                          [textData bytes], dataLength,
                                          buffer, 1024,
                                          &numBytesEncrypted);
    if (cryptStatus == kCCSuccess) {
        NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
        
        ciphertext = [data base64Encoding];
    }
    return ciphertext;
}

+(NSString*) decryptUseDES:(NSString*)cipherText key:(NSString*)key {
    
    const Byte iv[] = {1,2,3,4,5,6,7,8};
    
    NSData* cipherData = [GTMBase64 decodeString:cipherText];
//根据具体信息量设置下面值的大小
    unsigned char buffer[1024000];
    memset(buffer, 0, sizeof(char));
    size_t numBytesDecrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,
                                          kCCAlgorithmDES,
                                          kCCOptionPKCS7Padding,
                                          [key UTF8String],
                                          kCCKeySizeDES,
                                          iv,
                                          [cipherData bytes],
                                          [cipherData length],
                                          buffer,
                                          1024000,
                                          &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;
}

@end

BASE64 

#import "NSData+base64.h"

@implementation NSData (base64Encoding)
static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
- (NSString *)base64Encoding;
{
    if (self.length == 0)
        return @"";
    
    char *characters = malloc(self.length*3/2);
    
    if (characters == NULL)
        return @"";
    
    int end = self.length - 3;
    int index = 0;
    int charCount = 0;
    int n = 0;
    
    while (index <= end) {
        int d = (((int)(((char *)[self bytes])[index]) & 0x0ff) << 16)
        | (((int)(((char *)[self bytes])[index + 1]) & 0x0ff) << 8)
        | ((int)(((char *)[self bytes])[index + 2]) & 0x0ff);
        
        characters[charCount++] = encodingTable[(d >> 18) & 63];
        characters[charCount++] = encodingTable[(d >> 12) & 63];
        characters[charCount++] = encodingTable[(d >> 6) & 63];
        characters[charCount++] = encodingTable[d & 63];
        
        index += 3;
        
        if(n++ >= 14)
        {
            n = 0;
            characters[charCount++] = ' ';
        }
    }
    
    if(index == self.length - 2)
    {
        int d = (((int)(((char *)[self bytes])[index]) & 0x0ff) << 16)
        | (((int)(((char *)[self bytes])[index + 1]) & 255) << 8);
        characters[charCount++] = encodingTable[(d >> 18) & 63];
        characters[charCount++] = encodingTable[(d >> 12) & 63];
        characters[charCount++] = encodingTable[(d >> 6) & 63];
        characters[charCount++] = '=';
    }
    else if(index == self.length - 1)
    {
        int d = ((int)(((char *)[self bytes])[index]) & 0x0ff) << 16;
        characters[charCount++] = encodingTable[(d >> 18) & 63];
        characters[charCount++] = encodingTable[(d >> 12) & 63];
        characters[charCount++] = '=';
        characters[charCount++] = '=';
    }
    NSString * rtnStr = [[NSString alloc] initWithBytesNoCopy:characters length:charCount encoding:NSUTF8StringEncoding freeWhenDone:YES];
    return rtnStr;
}
@end

完工,可支持中文等,稍后传送门


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