IOS 纯DES加密 与 使用base64加密

本文主要是介绍IOS 纯DES加密 与 使用base64加密，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

DES是一种分组数据加密技术（先将数据分成固定长度的小数据块，之后进行加密），速度较快，适用于大量数据加密
3DES是一种基于DES的加密算法，使用3个不同密匙对同一个分组数据块进行3次加密，如此以使得密文强度更高。
相较于DES和3DES算法而言，AES算法有着更高的速度和资源使用效率，安全级别也较之更高了，被称为下一代加密标准。

使用前先下载GTMBase64 与 GTMDefines 文件；

用DES实现加密和解密的过程：（注释是我自己理解添加。不对的地方望指出）

.h文件中：

+ (NSString *)encryptWithText:(NSString *)sText;//加密  
+ (NSString *)decryptWithText:(NSString *)sText;//解密  

.m文件中  （导包： #import "GTMBase64.h"（下面说）   #import <CommonCrypto/CommonCryptor.h> ）

+ (NSString *)encryptWithText:(NSString *)sText  
{  //kCCEncrypt 加密  return [self encrypt:sText encryptOrDecrypt:kCCEncrypt key:@"des"];  
}  + (NSString *)decryptWithText:(NSString *)sText  
{  //kCCDecrypt 解密  return [self encrypt:sText encryptOrDecrypt:kCCDecrypt key:@"des"];  
}  + (NSString *)encrypt:(NSString *)sText encryptOrDecrypt:(CCOperation)encryptOperation key:(NSString *)key  
{  const void *dataIn;  size_t dataInLength;  if (encryptOperation == kCCDecrypt)//传递过来的是decrypt 解码  {  //解码 base64  NSData *decryptData = [GTMBase64 decodeData:[sText dataUsingEncoding:NSUTF8StringEncoding]];//转成utf-8并decode  dataInLength = [decryptData length];  dataIn = [decryptData bytes];  }  else  //encrypt  {  NSData* encryptData = [sText dataUsingEncoding:NSUTF8StringEncoding];  dataInLength = [encryptData length];  dataIn = (const void *)[encryptData bytes];  }  /* DES加密 ：用CCCrypt函数加密一下，然后用base64编码下，传过去 DES解密 ：把收到的数据根据base64，decode一下，然后再用CCCrypt函数解密，得到原本的数据 */  CCCryptorStatus ccStatus;  uint8_t *dataOut = NULL; //可以理解位type/typedef 的缩写（有效的维护了代码，比如：一个人用int，一个人用long。最好用typedef来定义）  size_t dataOutAvailable = 0; //size_t  是操作符sizeof返回的结果类型  size_t dataOutMoved = 0;  dataOutAvailable = (dataInLength + kCCBlockSizeDES) & ~(kCCBlockSizeDES - 1);  dataOut = malloc( dataOutAvailable * sizeof(uint8_t));  memset((void *)dataOut, 0x0, dataOutAvailable);//将已开辟内存空间buffer的首 1 个字节的值设为值 0  NSString *initIv = @"12345678";  const void *vkey = (const void *) [key UTF8String];  const void *iv = (const void *) [initIv UTF8String];  //CCCrypt函数 加密/解密  ccStatus = CCCrypt(encryptOperation,//  加密/解密  kCCAlgorithmDES,//  加密根据哪个标准（des，3des，aes。。。。）  kCCOptionPKCS7Padding,//  选项分组密码算法(des:对每块分组加一次密  3DES：对每块分组加三个不同的密)  vkey,  //密钥    加密和解密的密钥必须一致  kCCKeySizeDES,//   DES 密钥的大小（kCCKeySizeDES=8）  iv, //  可选的初始矢量  dataIn, // 数据的存储单元  dataInLength,// 数据的大小  (void *)dataOut,// 用于返回数据  dataOutAvailable,  &dataOutMoved);  NSString *result = nil;  if (encryptOperation == kCCDecrypt)//encryptOperation==1  解码  {  //得到解密出来的data数据，改变为utf-8的字符串  result = [[[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)dataOut length:(NSUInteger)dataOutMoved] encoding:NSUTF8StringEncoding] autorelease];  }  else //encryptOperation==0  （加密过程中，把加好密的数据转成base64的）  {  //编码 base64  NSData *data = [NSData dataWithBytes:(const void *)dataOut length:(NSUInteger)dataOutMoved];  result = [GTMBase64 stringByEncodingData:data];  }  return result;  

测试：

NSString *encrypt = [ViewController encryptWithText:@"中华人民共和国万岁！！"];  NSLog(@"enctry = %@",encrypt);  NSString *decrypt = [ViewController decryptWithText:encrypt];  NSLog(@"decrypt = %@",decrypt); 

未使用base64加密 纯des加密

// 把一个byte数据转换为字符串
+(NSString *) parseByte2HexString:(Byte *) bytes;
// 把一个byte数组转换为字符串
+(NSString *) parseByteArray2HexString:(Byte[]) bytes;// nsData 转16进制
+ (NSString*)stringWithHexBytes2:(NSData *)sender;/****** 加密 ******/
+(NSString *) encryptUseDES:(NSString *)clearText key:(NSString *)key;
/****** 解密 ******/
+(NSString *) decryptUseDES:(NSString *)plainText key:(NSString *)key;

#import "DES.h"
#import <CommonCrypto/CommonCryptor.h>//static Byte iv[] = {'3','B','1','3','0','8','B','5'};//only Used for Cipher Block Chaining (CBC) mode,This is ignored if ECB mode is used
@implementation DES#pragma mark - DES_Mothed
/******************************************************************************函数描述 : 文本数据进行DES加密******************************************************************************/
+(NSString *) encryptUseDES:(NSString *)clearText key:(NSString *)key
{NSString *ciphertext = nil;NSData *textData = [clearText dataUsingEncoding:NSUTF8StringEncoding];NSUInteger dataLength = [textData length];size_t bufferSize = dataLength + kCCBlockSizeAES128;void * buffer = malloc(bufferSize);size_t numBytesEncrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmDES,kCCOptionPKCS7Padding | kCCOptionECBMode,[key UTF8String], kCCBlockSizeDES,NULL,[textData bytes]  , dataLength,buffer, bufferSize,&numBytesEncrypted);if (cryptStatus == kCCSuccess) {NSLog(@"DES加密成功");NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];ciphertext = [self stringWithHexBytes2:data];}else{NSLog(@"DES加密失败");}free(buffer);return ciphertext;
}/******************************************************************************函数描述 : 文本数据进行DES解密******************************************************************************/
+(NSString *) decryptUseDES:(NSString *)plainText key:(NSString *)key
{NSString *cleartext = nil;NSData *textData = [self parseHexToByteArray:plainText];NSUInteger dataLength = [textData length];size_t bufferSize = dataLength + kCCBlockSizeAES128;void *buffer = malloc(bufferSize);size_t numBytesEncrypted = 0;CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmDES,kCCOptionPKCS7Padding | kCCOptionECBMode,[key UTF8String], kCCKeySizeDES,NULL,[textData bytes]  , dataLength,buffer, bufferSize,&numBytesEncrypted);if (cryptStatus == kCCSuccess) {NSLog(@"DES解密成功");NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)numBytesEncrypted];cleartext = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];}else{NSLog(@"DES解密失败");}free(buffer);return cleartext;
}//nsdata转成16进制字符串
+ (NSString*)stringWithHexBytes2:(NSData *)sender {static const char hexdigits[] = "0123456789ABCDEF";const size_t numBytes = [sender length];const unsigned char* bytes = [sender bytes];char *strbuf = (char *)malloc(numBytes * 2 + 1);char *hex = strbuf;NSString *hexBytes = nil;for (int i = 0; i<numBytes; ++i) {const unsigned char c = *bytes++;*hex++ = hexdigits[(c >> 4) & 0xF];*hex++ = hexdigits[(c ) & 0xF];}*hex = 0;hexBytes = [NSString stringWithUTF8String:strbuf];free(strbuf);return hexBytes;
}/*将16进制数据转化成NSData 数组*/
+(NSData*) parseHexToByteArray:(NSString*) hexString
{int j=0;Byte bytes[hexString.length];for(int i=0;i<[hexString length];i++){int int_ch;  /// 两位16进制数转化后的10进制数unichar hex_char1 = [hexString characterAtIndex:i]; 两位16进制数中的第一位(高位*16)int int_ch1;if(hex_char1 >= '0' && hex_char1 <='9')int_ch1 = (hex_char1-48)*16;    0 的Ascll - 48else if(hex_char1 >= 'A' && hex_char1 <='F')int_ch1 = (hex_char1-55)*16;  A 的Ascll - 65elseint_ch1 = (hex_char1-87)*16;  a 的Ascll - 97i++;unichar hex_char2 = [hexString characterAtIndex:i]; ///两位16进制数中的第二位(低位)int int_ch2;if(hex_char2 >= '0' && hex_char2 <='9')int_ch2 = (hex_char2-48);  0 的Ascll - 48else if(hex_char2 >= 'A' && hex_char1 <='F')int_ch2 = hex_char2-55;  A 的Ascll - 65elseint_ch2 = hex_char2-87;  a 的Ascll - 97int_ch = int_ch1+int_ch2;bytes[j] = int_ch;  ///将转化后的数放入Byte数组里j++;}NSData *newData = [[NSData alloc] initWithBytes:bytes length:hexString.length/2];return newData;
}+(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++;}}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++;}}return [hexStr uppercaseString];
}@end

 NSString *keyString = @"bayilaoye#66#88";NSString *strString = @"我们都有一个家的权威的权威的权威的期望ccccMadison1234567890--";NSData *testData = [strString dataUsingEncoding: NSUTF8StringEncoding];//获取尺寸NSLog(@"加密前 资源数据strByte =:%@ \ndataLength  =: %ld",strString,[strString length]);NSString *strParse = [DES stringWithHexBytes2:testData];NSLog(@"加密前 16进制数据strParse =:%@ \nstrParseLength  =: %ld",strParse,[strParse length]);NSString * encryptBytes = [DES encryptUseDES:strString key:keyString];//加密NSLog(@"encryptBytes = %@ \nLength = :%ld", encryptBytes, [encryptBytes length]);NSString * decryptBytes = [DES decryptUseDES:encryptBytes key:keyString];//解密NSLog(@"decryptBytes = %@ \nLength =: %ld", decryptBytes, [decryptBytes length]);

这篇博客使用了des 与 base64 加密整合的 加密方式 确实写的不错 如果加密失败你可以修改存储内存值http://www.cnblogs.com/janken/archive/2012/04/05/2432930.html

<div><p></p></div>

这篇关于IOS 纯DES加密 与 使用base64加密的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---