from http://blog.csdn.net/daiyelang/article/details/25596397
Objective-c實現md5和SHA1算法相對還是比較簡單的，可以直接調用系統的C/C++共享庫來實現調用 MD5即Message Digest Algorithm 5（信息-摘要算法 5），用于確保信息傳輸完整一致。是計算機廣泛使用的雜湊算法之一 SHA即Secure Hash Algorithm（安全散列算法) 是美國國家安全局 (NSA) 設計，美國國家標準與技術研究院 (NIST) 發布的一系列密碼散列函數。 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; } 當然也可以結合BASE64來使用,這里的BASE64編碼使用 GTMBase64實現，需要導入 - (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; } 通過拓展NSString，實現完整功能，全部代碼 @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 實現時候不要忘記導入CC相關的庫的頭文件 CommonCrypto/CommonDigest.h新聞熱點
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