最近做了个app应用，应用中设计到接口的调用，为了接口调用的安全性，需要进行加密处理，就需要用到可逆和不可逆的加密算法，这里提供一下：
Java + Android
DES加密算法DES：
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class DES {
public static void main(String[] args) {
try {
String plaintext = "abcd";
String key ="12345678";//密码必须为8位
String ciphertext = DES.encryptDES(plaintext, key);
System.out.println("明文：" + plaintext);
System.out.println("密钥：" + key);
System.out.println("密文：" + ciphertext);
System.out.println("解密后：" + DES.decryptDES(ciphertext,key));
} catch (Exception e) {
System.out.println(e);
}
}
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(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);
}
//===================================
/**将二进制转换成16进制
* @param buf
* @return String
*/
public static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}
}
辅助类 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);
}
}
}
IOS加密类DES.m DES.h：
//
// DES.m
// OC
//
// Created by mac on 14-11-2.
// Copyright (c) 2014年 liuli. All rights reserved.
//
#import "DES.h"
#import "Base64.h"
#import<CommonCrypto/CommonCryptor.h>
@implementation DES
const Byte iv[] = {1,2,3,4,5,6,7,8};
+(NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key
{
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,
iv,
[textData bytes], dataLength,
buffer, 1024,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];
ciphertext = [Base64 encode:data];
}
return ciphertext;
}
+(NSString *) parseByte2HexString:(Byte *) bytes
{
NSMutableString *hexStr = [[NSMutableString alloc]init];
int i = 0;
if(bytes)
{
while (bytes[i] != '\0')
{
NSString *hexByte = [NSString stringWithFormat:@"%x",bytes[i] & 0xff];///16进制数
if([hexByte length]==1)
[hexStr appendFormat:@"0%@", hexByte];
else
[hexStr appendFormat:@"%@", hexByte];
i++;
}
}
NSLog(@"bytes 的16进制数为:%@",hexStr);
return hexStr;
}
+(NSString *) parseByteArray2HexString:(Byte[]) bytes
{
NSMutableString *hexStr = [[NSMutableString alloc]init];
int i = 0;
if(bytes)
{
while (bytes[i] != '\0')
{
NSString *hexByte = [NSString stringWithFormat:@"%x",bytes[i] & 0xff];///16进制数
if([hexByte length]==1)
[hexStr appendFormat:@"0%@", hexByte];
else
[hexStr appendFormat:@"%@", hexByte];
i++;
}
}
NSLog(@"bytes 的16进制数为:%@",hexStr);
return hexStr;
}
+(NSString *)decryptUseDES:(NSString *)cipherText key:(NSString *)key
{
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,
iv,
[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
//
// DES.h
// OC
//
// Created by mac on 14-11-2.
// Copyright (c) 2014年 liuli. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface DES : NSObject
+(NSString *) encryptUseDES:(NSString *)plainText key:(NSString *)key;
+(NSString *) parseByte2HexString:(Byte *) bytes;
+(NSString *) parseByteArray2HexString:(Byte[]) bytes;
+(NSString *)decryptUseDES:(NSString *)cipherText key:(NSString *)key;
@end
辅助类 Base64.m Base64.h：
//
// Base64.m
// OC
//
// Created by mac on 14-11-2.
// Copyright (c) 2014年 liuli. All rights reserved.
//
#import "Base64.h"
static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
@interface Base64()
@end
@implementation Base64
+(NSString *)encode:(NSData *)data
{
if (data.length == 0)
return nil;
char *characters = malloc(data.length * 3 / 2);
if (characters == NULL)
return nil;
long end = data.length - 3;
int index = 0;
int charCount = 0;
int n = 0;
while (index <= end) {
int d = (((int)(((char *)[data bytes])[index]) & 0x0ff) << 16)
| (((int)(((char *)[data bytes])[index + 1]) & 0x0ff) << 8)
| ((int)(((char *)[data 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 == data.length - 2)
{
int d = (((int)(((char *)[data bytes])[index]) & 0x0ff) << 16)
| (((int)(((char *)[data 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 == data.length - 1)
{
int d = ((int)(((char *)[data 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;
}
+(NSData *)decode:(NSString *)data
{
if(data == nil || data.length <= 0) {
return nil;
}
NSMutableData *rtnData = [[NSMutableData alloc]init];
long slen = data.length;
int index = 0;
while (true) {
while (index < slen && [data characterAtIndex:index] <= ' ') {
index++;
}
if (index >= slen || index + 3 >= slen) {
break;
}
int byte = ([self char2Int:[data characterAtIndex:index]] << 18) + ([self char2Int:[data characterAtIndex:index + 1]] << 12) + ([self char2Int:[data characterAtIndex:index + 2]] << 6) + [self char2Int:[data characterAtIndex:index + 3]];
Byte temp1 = (byte >> 16) & 255;
[rtnData appendBytes:&temp1 length:1];
if([data characterAtIndex:index + 2] == '=') {
break;
}
Byte temp2 = (byte >> 8) & 255;
[rtnData appendBytes:&temp2 length:1];
if([data characterAtIndex:index + 3] == '=') {
break;
}
Byte temp3 = byte & 255;
[rtnData appendBytes:&temp3 length:1];
index += 4;
}
return rtnData;
}
+(int)char2Int:(char)c
{
if (c >= 'A' && c <= 'Z') {
return c - 65;
} else if (c >= 'a' && c <= 'z') {
return c - 97 + 26;
} else if (c >= '0' && c <= '9') {
return c - 48 + 26 + 26;
} else {
switch(c) {
case '+':
return 62;
case '/':
return 63;
case '=':
return 0;
default:
return -1;
}
}
}
@end
//
// Base64.h
// OC
//
// Created by mac on 14-11-2.
// Copyright (c) 2014年 liuli. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface Base64 : NSObject
+(NSData *)decode:(NSString *)data;
+(NSString *)encode:(NSData *)data;
+(int)char2Int:(char)c;
@end