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iOS开发之Objective-c的MD5/SHA1加密算法的实现

2013-09-16 17:45 302 查看

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

-(NSString *) md5
{
const char *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 char *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 char *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 char *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;
}

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 = [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;
}
 
-(NSString *) md5
{
const char *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;
}
 
- (NSString *) sha1_base64
{
const char *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 char *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;
}
 
- (NSString *) base64
{
NSData * data = [self dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
data = [GTMBase64 encodeData:data];
NSString * output = [[NSString alloc] 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

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