MD5 base64 sha1 加密，解密

Objective-c实现MD5和SHA1算法相对还是比较简单的，可以直接调用系统的C/C++共享库来实现调用  

MD5即Message Digest Algorithm 5（信息-摘要算法 5），用于确保信息传输完整一致。是计算机广泛使用的杂凑算法之一  

SHA即Secure Hash Algorithm（安全散列算法) 是美国国家安全局 (NSA) 设计，美国国家标准与技术研究院 (NIST) 发布的一系列密码散列函数。  

  

  

使用方式如下:  

MD5加密方式  

  

SString *) md5  

{  

    const charchar *cStr = [self UTF8String];  

    unsigned char digest[CC_MD5_DIGEST_LENGTH];  

    CC_MD5( cStr, strlen(cStr), digest );  

   

    NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];  

   

    for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)  

        [output appendFormat:@"%02x", digest[i]];  

   

    return output;  

}  

SHA1加密方式  

  

- (NSString*) sha1  

{  

    const charchar *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];  

    NSData *data = [NSData dataWithBytes:cstr length:self.length];  

   

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];  

   

    CC_SHA1(data.bytes, data.length, digest);  

   

    NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];  

   

    for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++)  

        [output appendFormat:@"%02x", digest[i]];  

   

    return output;  

}  

当然也可以结合BASE64来使用,这里的BASE64编码使用 GTMBase64实现，需要导入  

  

- (NSString *) sha1_base64  

{  

    const charchar *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];  

    NSData *data = [NSData dataWithBytes:cstr length:self.length];  

   

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];  

   

    CC_SHA1(data.bytes, data.length, digest);  

   

    NSData * base64 = [[NSData alloc]initWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];  

    base64 = [GTMBase64 encodeData:base64];  

   

    NSString * output = [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding];   

    return output;   

}  

   

- (NSString *) md5_base64  

{  

    const charchar *cStr = [self UTF8String];  

    unsigned char digest[CC_MD5_DIGEST_LENGTH];  

    CC_MD5( cStr, strlen(cStr), digest );  

   

    NSData * base64 = [[NSData alloc]initWithBytes:digest length:CC_MD5_DIGEST_LENGTH];  

    base64 = [GTMBase64 encodeData:base64];  

   

    NSString * output = [[NSString alloc] initWithData:base64 encoding:NSUTF8StringEncoding];   

    return output;  

}  

以下是实现完整功能，全部代码  GTMBase64 下载地址：http://download.csdn.net/detail/hslinux/7868363

  

//

//  ViewController.m

//  Base64AndMD5AndSha1

//

//  Created by liuhaiyan on 16/7/4.

//  Copyright © 2016年 qust. All rights reserved.

//

#import "ViewController.h"

#import <CommonCrypto/CommonCrypto.h>

#import "GTMBase64.h"

#import "GTMDefines.h"

@interface
ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    

    NSLog(@"%@",[selfsha1:@"bviulbvcksdhiu"]);

    NSLog(@"%@",[selfsha1_base64:@"bviulbvcksdhiu"]);

    NSLog(@"%@",[selfbase64:@"rbgiyrbsvjhsg"]);

    NSLog(@"%@",[selfbase641:@"cmJnaXlyYnN2amhzZw=="]);

    NSLog(@"%@",[selfmd5:@"rbgiyrbsvjhsg"]);

    NSLog(@"%@",[selfmd5_base64:@"rbgiyrbsvjhsg"]);

}

- (void)didReceiveMemoryWarning {

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (NSString*) sha1:(NSString *)str

{

    constchar *cstr = [strcStringUsingEncoding:NSUTF8StringEncoding];

    NSData *data = [NSDatadataWithBytes:cstrlength:str.length];

    

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

    

    CC_SHA1(data.bytes, (unsigned)data.length,
digest);

    

    NSMutableString* output = [NSMutableStringstringWithCapacity:CC_SHA1_DIGEST_LENGTH
*2];

    

    for(int i =0; i <CC_SHA1_DIGEST_LENGTH;
i++)

        [output appendFormat:@"%02x", digest[i]];

    

    return output;

}

- (NSString *) base64:(NSString *)str

{

    NSData * data = [strdataUsingEncoding:NSASCIIStringEncodingallowLossyConversion:YES];

    data = [GTMBase64encodeData:data];

    NSString * output = [[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding];

    return output;

}

-(NSString *) md5:(NSString *)str

{

    constchar *cStr = [strUTF8String];

    unsignedchar digest[CC_MD5_DIGEST_LENGTH];

    CC_MD5( cStr, (unsigned)strlen(cStr), digest );

    

    NSMutableString *output = [NSMutableStringstringWithCapacity:CC_MD5_DIGEST_LENGTH
*2];

    

    for(int i =0; i <CC_MD5_DIGEST_LENGTH;
i++)

        [output appendFormat:@"%02x", digest[i]];

    

    return output;

}

- (NSString *) base641:(NSString *)str

{

    NSData * data = [strdataUsingEncoding:NSASCIIStringEncodingallowLossyConversion:YES];

    data = [GTMBase64decodeData:data];

    NSString * output = [[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding];

    return output;

    

}

- (NSString *) sha1_base64:(NSString *)str

{

    constchar *cstr = [strcStringUsingEncoding:NSUTF8StringEncoding];

    NSData *data = [NSDatadataWithBytes:cstrlength:str.length];

    

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

    

    CC_SHA1(data.bytes, (unsigned)data.length,
digest);

    

    NSData * base64 = [[NSDataalloc]initWithBytes:digestlength:CC_SHA1_DIGEST_LENGTH];

    base64 = [GTMBase64encodeData:base64];

    

    NSString * output = [[NSStringalloc]initWithData:base64encoding:NSUTF8StringEncoding];

    return output;

}

- (NSString *) md5_base64:(NSString *)str

{

    constchar *cStr = [strUTF8String];

    unsignedchar digest[CC_MD5_DIGEST_LENGTH];

    CC_MD5( cStr, (unsigned)strlen(cStr), digest );

    

    NSData * base64 = [[NSDataalloc]initWithBytes:digestlength:CC_MD5_DIGEST_LENGTH];

    base64 = [GTMBase64encodeData:base64];

    

    NSString * output = [[NSStringalloc]initWithData:base64encoding:NSUTF8StringEncoding];

    return output;

}

@end

下面一张截图，为加密后的结果