iOS开发之Objective-c的MD5/SHA1加密算法的实现

2019-11-06 08:45:06

字体：大中小

来源：转载

供稿：网友

from http://blog.csdn.net/daiyelang/article/details/25596397

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; } 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

上一篇：iOS sha1加密算法

下一篇：iOS中使用RSA加密