public void CalculateMessageLength()
{
const int ciphertextLength = 80;
const int expectedLength = ciphertextLength - HeaderBytes;
var sb = new SecretBox();
Assert.That(sb.CalculateMessageLength(ciphertextLength), Is.EqualTo(expectedLength));
}
public void CalculateMessageLength_Invalid(int ciphertextLength)
{
var sb = new SecretBox();
Assert.That(
() => sb.CalculateMessageLength(ciphertextLength),
Throws.ArgumentException.With.Message.EqualTo(
$"ciphertextLength must be greater than {nameof(HeaderBytes)}"));
}
public void Decrypt_ValidateKeyLength(int keyLength)
{
var sb = new SecretBox();
var key = new byte[keyLength];
const int clen = 100;
var c = new byte[clen];
var m = new byte[sb.CalculateMessageLength(clen)];
var ctx = "test";
Assert.That(
() => sb.Decrypt(m, c, clen, key, ctx),
Throws.ArgumentException.With.Message.EqualTo(
$"'key' length must be {KeyBytes} bytes"));
}
public void Decrypt_ValidateContextLength_TooLong()
{
var sb = new SecretBox();
var key = new byte[KeyBytes];
const int clen = 100;
var c = new byte[clen];
var m = new byte[sb.CalculateMessageLength(clen)];
var ctx = "you are old father william";
Assert.That(
() => sb.Decrypt(m, c, clen, key, ctx),
Throws.ArgumentException.With.Message.EqualTo(
$"'context' must be at most {ContextBytes} characters"));
}
public void Decrypt_ValidateCiphertextLength_TooLong()
{
var sb = new SecretBox();
var key = new byte[KeyBytes];
const int clen = 200;
const int clenActual = 100;
var c = new byte[clenActual];
var m = new byte[sb.CalculateMessageLength(clenActual)];
var ctx = "test";
Assert.That(
() => sb.Decrypt(m, c, clen, key, ctx),
Throws.ArgumentException.With.Message.EqualTo(
$"'ciphertextLength' must be at most the length of 'ciphertext'"));
}