MD5加密相关方法

需要导入的头文件#import <CommonCrypto/CommonCrypto.h>

MD5加密（NSData -> NSData）

+ (NSData *)toMD5:(NSData *)data {
    @try {
        unsigned char result[16];
        CC_MD5([data bytes], (CC_LONG)[data length], result);
        return [NSData dataWithBytes:result length:16];
    }
    @catch (NSException *exception) {
       NSLog(@"%@", exception);
        return nil;
    }
}

MD5加密字符串,生成字符串（NSString -> NSString）

+ (NSString *)toMD5String:(NSString *)source {
    @try {
        if (!source || ![source isKindOfClass:[NSString class]]) {
            return nil;
        }

        const char *cStr = [source UTF8String];
        unsigned char result[16];
        CC_MD5(cStr, (CC_LONG) strlen(cStr), result);
        return [NSString stringWithFormat:
                             @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
                             result[0], result[1], result[2], result[3],
                             result[4], result[5], result[6], result[7],
                             result[8], result[9], result[10], result[11],
                             result[12], result[13], result[14], result[15]];
    }
    @catch (NSException *exception) {
        NSLog(@"%@", exception);
        return nil;
    }
}

MD5加密字符串,生成Data (NSString -> NSData)

+ (NSData *)toMD5Data:(NSString *)source {
    @try {
        if (!source || ![source isKindOfClass:[NSString class]]) {
            return nil;
        }

        const char *cStr = [source UTF8String];
        unsigned char result[16];
        CC_MD5(cStr, (CC_LONG) strlen(cStr), result);
        return [NSData dataWithBytes:result length:16];
    }
    @catch (NSException *exception) {
        NSLog(@"%@", exception);
        return nil;
    }
}