/// <summary>
/// Creates a cryptographically strong random verification code.
/// </summary>
/// <param name="format">The desired format of the verification code.</param>
/// <param name="length">The length of the code.
/// When <paramref name="format"/> is <see cref="VerificationCodeFormat.IncludedInCallback"/>,
/// this is the length of the original byte array before base64 encoding rather than the actual
/// length of the final string.</param>
/// <returns>The verification code.</returns>
public static string CreateVerificationCode(VerificationCodeFormat format, int length)
{
Requires.InRange(length >= 0, "length");
switch (format)
{
case VerificationCodeFormat.IncludedInCallback:
return(MessagingUtilities.GetCryptoRandomDataAsBase64(length));
case VerificationCodeFormat.AlphaNumericNoLookAlikes:
return(MessagingUtilities.GetRandomString(length, MessagingUtilities.AlphaNumericNoLookAlikes));
case VerificationCodeFormat.AlphaUpper:
return(MessagingUtilities.GetRandomString(length, MessagingUtilities.UppercaseLetters));
case VerificationCodeFormat.AlphaLower:
return(MessagingUtilities.GetRandomString(length, MessagingUtilities.LowercaseLetters));
case VerificationCodeFormat.Numeric:
return(MessagingUtilities.GetRandomString(length, MessagingUtilities.Digits));
default:
throw new ArgumentOutOfRangeException("format");
}
}
private void TestCode(VerificationCodeFormat format, int length, string allowableCharacters) {
string code = ServiceProvider.CreateVerificationCode(format, length);
TestUtilities.TestLogger.InfoFormat("{0} of length {2}: {1}", format, code, length);
Assert.AreEqual(length, code.Length);
foreach (char ch in code) {
Assert.IsTrue(allowableCharacters.Contains(ch));
}
}
private void TestCode(VerificationCodeFormat format, int length, string allowableCharacters)
{
string code = ServiceProvider.CreateVerificationCode(format, length);
TestUtilities.TestLogger.InfoFormat("{0} of length {2}: {1}", format, code, length);
Assert.AreEqual(length, code.Length);
foreach (char ch in code)
{
Assert.IsTrue(allowableCharacters.Contains(ch));
}
}
/// <summary>
/// Creates a cryptographically strong random verification code.
/// </summary>
/// <param name="format">The desired format of the verification code.</param>
/// <param name="length">The length of the code.
/// When <paramref name="format"/> is <see cref="VerificationCodeFormat.IncludedInCallback"/>,
/// this is the length of the original byte array before base64 encoding rather than the actual
/// length of the final string.</param>
/// <returns>The verification code.</returns>
public static string CreateVerificationCode(VerificationCodeFormat format, int length) {
Requires.InRange(length >= 0, "length");
switch (format) {
case VerificationCodeFormat.IncludedInCallback:
return MessagingUtilities.GetCryptoRandomDataAsBase64(length);
case VerificationCodeFormat.AlphaNumericNoLookAlikes:
return MessagingUtilities.GetRandomString(length, MessagingUtilities.AlphaNumericNoLookAlikes);
case VerificationCodeFormat.AlphaUpper:
return MessagingUtilities.GetRandomString(length, MessagingUtilities.UppercaseLetters);
case VerificationCodeFormat.AlphaLower:
return MessagingUtilities.GetRandomString(length, MessagingUtilities.LowercaseLetters);
case VerificationCodeFormat.Numeric:
return MessagingUtilities.GetRandomString(length, MessagingUtilities.Digits);
default:
throw new ArgumentOutOfRangeException("format");
}
}
