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 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:(NSString *)input
{
const char *cstr = [input cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:input.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;

}

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 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;

}

-(NSString *) 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;

}

- (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;

}

- (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