How to confirm password confirmation using validateValue

Question

I have a password field, and the way I use validation looks something like this:

-(BOOL)validatePassword:(id *)ioValue error:(NSError **)outError{
    if (*ioValue == nil) {
        if (outError != NULL) {
            NSString *errorString = NSLocalizedString(
                                                      @"Password must not be empty",
                                                      @"validation: Person, Password empty error");
            NSDictionary *userInfoDict = @{ NSLocalizedDescriptionKey : errorString };
            *outError = [[NSError alloc] initWithDomain:PERSON_ERROR_DOMAIN
                                                   code:PERSON_INVALID_PASSWORD_CODE
                                               userInfo:userInfoDict];
        }
        return NO;
    }
    return YES;
}

The way I verify the password confirmation is:

-(BOOL)validateConfirmPassword:(id *)ioValue error:(NSError **)outError{
    if ((*ioValue == nil) ||am (![self.password isEqualToString:*ioValue])) {
        if (outError != NULL) {
            NSString *errorString = NSLocalizedString(
                                                      @"Your passwords must match.",
                                                      @"validation: Person, Passwords must match. error");
            NSDictionary *userInfoDict = @{ NSLocalizedDescriptionKey : errorString };
            *outError = [[NSError alloc] initWithDomain:PERSON_ERROR_DOMAIN
                                                   code:PERSON_INVALID_CONFIRM_PASSWORD_CODE
                                               userInfo:userInfoDict];
        }
        return NO;
    }
    return YES;
}

The problem I am facing is whenever I print the exact value for both fields, for example:

"password": "Test" "ConfirmPassword": "test"

works fine.

Now, when I replace one key like "confirmPassword": "tes", my verification methods do not work, because it does not set a value for the key.

How can I deal with this problem?