纯des 加密

#import@interface CommonFunc : NSObject

//十六进制转换和nsdata的转换。

+ (NSString *)convertDataToHexStr:(NSData *)data;

+(NSData *)convertHexStrToData:(NSString *)str;

/*字符串加密

*参数

*plainText : 加密明文

*key        : 密钥 64位

*/

//加密方法encryptUseDES:key:如下

+(NSString *) encryptUseDES:(NSString *)plainText key:(NSString*)key;

//解密方法decryptUseDES:key:如下

+(NSString*) decryptUseDES:(NSString*)cipherText key:(NSString*)key;

@end

#import "CommonFunc.h"// base 加密//#import#import#include@implementation CommonFunc

static Byte iv[8]={1,2,3,4,5,6,7,8};

//加密方法encryptUseDES:key:如下

+(NSString *) encryptUseDES:(NSString *)plainText key:(NSString*)key

{

NSString *ciphertext =nil;

NSData* data=[plainText dataUsingEncoding: NSUTF8StringEncoding];

//    NSLog(@"plainTextBytes with UTF-8 encoding:%@",[XYDESdataToHex:data]);

NSUInteger bufferSize=([data length] + kCCKeySizeDES) & ~(kCCKeySizeDES -1);

char buffer[bufferSize];

memset(buffer, 0,sizeof(buffer));

size_t bufferNumBytes;

CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,

kCCAlgorithmDES,

kCCOptionPKCS7Padding,

[key UTF8String],

kCCKeySizeDES,

iv  ,

[data bytes],

[data length],

buffer,

bufferSize,

&bufferNumBytes);

if (cryptStatus ==kCCSuccess) {

NSData *data = [NSData dataWithBytes:buffer length:(NSUInteger)bufferNumBytes];

//        NSLog(@"objccipherTextBytes:%@",[XYDES dataToHex:data]);

NSLog(@"JavacipherTextBytes:%@",@"D72EA24833C4731FE9960B48DB705E7AF99AB772C6E6E19CE8F3F8EA16EE5297");

// base 加密

//        ciphertext = [GTMBase64 stringByEncodingData:data];

ciphertext =[self convertDataToHexStr: data];

NSLog(@"objccipherTextBase64:%@",ciphertext);

NSLog(@"JavacipherTextBase64:%@",@"1y6iSDPEcx/plgtI23Beevmat3LG5uGc6PP46hbuUpc=");

}

return ciphertext;

}

+ (NSString *)convertDataToHexStr:(NSData *)data {

if (!data || [data length] == 0) {

return @"";

}

NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[data length]];

[data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) {

unsigned char *dataBytes = (unsigned char*)bytes;

for (NSInteger i = 0; i < byteRange.length; i++) {

NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff];

if ([hexStr length] == 2) {

[string appendString:hexStr];

} else {

[string appendFormat:@"0%@", hexStr];

}

}

}];

return string;

}

+(NSData *)convertHexStrToData:(NSString *)str {

if (!str || [str length] == 0) {

return nil;

}

NSMutableData *hexData = [[NSMutableData alloc] initWithCapacity:8];

NSRange range;

if ([str length] % 2 == 0) {

range = NSMakeRange(0, 2);

} else {

range = NSMakeRange(0, 1);

}

for (NSInteger i = range.location; i < [str length]; i += 2) {

unsigned int anInt;

NSString *hexCharStr = [str substringWithRange:range];

NSScanner *scanner = [[NSScanner alloc] initWithString:hexCharStr];

[scanner scanHexInt:&anInt];

NSData *entity = [[NSData alloc] initWithBytes:&anInt length:1];

[hexData appendData:entity];

range.location += range.length;

range.length = 2;

}

return hexData;

}

//解密方法decryptUseDES:key:如下

+(NSString*) decryptUseDES:(NSString*)cipherText key:(NSString*)key

{

// base 加密

//    NSData* data = [GTMBase64 decodeString:cipherText];

NSData *data =[self convertHexStrToData:cipherText];

NSUInteger bufferSize=([data length] + kCCKeySizeDES) & ~(kCCKeySizeDES -1);

char buffer[bufferSize];

memset(buffer, 0,sizeof(buffer));

size_t bufferNumBytes;

CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,

kCCAlgorithmDES,

kCCOptionPKCS7Padding,

[key UTF8String],

kCCKeySizeDES,

iv,

[data bytes],

[data length],

buffer,

bufferSize,

&bufferNumBytes);

NSString* plainText = nil;

if (cryptStatus ==kCCSuccess) {

NSData *plainData =[NSData dataWithBytes:buffer length:(NSUInteger)bufferNumBytes];

//        NSLog(@"plainTextBytes:%@",[XYDES dataToHex:plainData]);

plainText = [[NSString alloc] initWithData:plainData encoding:NSUTF8StringEncoding];

}

return plainText;

}