encrParameters

encr.m

    //parameters
    NSMutableArray *keys = [[NSMutableArray alloc] init];
    for (NSString * key in parameters)
    {
        [keys addObject:key];
    }
    
    [keys sortUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
    
    NSMutableString * stringParams = [[NSMutableString alloc] initWithString:@""];
    
    for (NSString * val in keys)
    {
        [stringParams appendString:[self md5:parameters[val]]];
    }
    
    [stringParams appendString:[self md5:@"YOURSECRETKEY"]];
    
    NSMutableDictionary *newParams = [parameters mutableCopy];
    [newParams setObject:[self sha256HashFor:stringParams] forKey:@"encr"];
    
    
- (NSString *) md5:(NSString *) input
{
    const char *cStr = [input UTF8String];
    unsigned char digest[16];
    CC_MD5( cStr, strlen(cStr), digest ); // This is the md5 call
    
    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*)sha256HashFor:(NSString*)input
{
    const char* str = [input UTF8String];
    unsigned char result[CC_SHA256_DIGEST_LENGTH];
    CC_SHA256(str, (CC_LONG)strlen(str), result);
    
    NSMutableString *ret = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH*2];
    for(int i = 0; i<CC_SHA256_DIGEST_LENGTH; i++)
    {
        [ret appendFormat:@"%02x",result[i]];
    }
    return ret;
}