iOS开发之Objective-c的MD5/SHA1加密算法的实现

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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MessageDigest 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SecureHash 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

 

-(NSString*) md5

{

    const char *cStr = [self UTF8String];

    unsigned char digest[CC_MD5_DIGEST_LENGTH];

    CC_MD5( cStr, 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;

}

 

 

 

SHA1加密方式

 

- (NSString*)sha1

{

    const char *cstr = [selfcStringUsingEncoding:NSUTF8StringEncoding];

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

 

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

 

    CC_SHA1(data.bytes, 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;

}

 

 

 

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 char *cstr = [selfcStringUsingEncoding:NSUTF8StringEncoding];

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

 

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

 

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

 

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

    base64 = [GTMBase64 encodeData:base64];

 

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

    return output;

}

 

- (NSString*) md5_base64

{

    const char *cStr = [self UTF8String];

    unsigned char digest[CC_MD5_DIGEST_LENGTH];

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

 

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

    base64 = [GTMBase64 encodeData:base64];

 

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

    return output;

}

 

 

 

通过拓展NSString，实现完整功能，全部代码

 

@interface NSString(encrypto)

- (NSString*) md5;

- (NSString*) sha1;

- (NSString*) sha1_base64;

- (NSString*) md5_base64;

- (NSString*) base64;

 

@end

@implementation NSString(encrypto)

- (NSString*)sha1

{

    const char *cstr = [selfcStringUsingEncoding:NSUTF8StringEncoding];

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

 

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

 

    CC_SHA1(data.bytes, 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*) md5

{

    const char *cStr = [self UTF8String];

    unsigned char digest[CC_MD5_DIGEST_LENGTH];

    CC_MD5( cStr, 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*) sha1_base64

{

    const char *cstr = [selfcStringUsingEncoding:NSUTF8StringEncoding];

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

 

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

 

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

 

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

    base64 = [GTMBase64 encodeData:base64];

 

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

    return output;

}

 

- (NSString*) md5_base64

{

    const char *cStr = [self UTF8String];

    unsigned char digest[CC_MD5_DIGEST_LENGTH];

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

 

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

    base64 = [GTMBase64 encodeData:base64];

 

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

    return output;

}

 

- (NSString*) base64

{   

    NSData* data = [self dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

    data = [GTMBase64 encodeData:data];

    NSString* output = [[NSStringalloc] initWithData:data encoding:NSUTF8StringEncoding];

    return output;

}

@end

 

 

实现时候不要忘记导入CC相关的库的头文件

CommonCrypto/CommonDigest.h