public static Nonce Answer(Stamp stamp, uint difficulty)
{
int counter = 1;
while (true)
{
var nonce = new Nonce(BitConverter.GetBytes(counter));
var digest = Hash(stamp(nonce));
if (digest.HasLeadingZeroBits(difficulty))
{
return(nonce);
}
counter++;
}
}
/// <summary>
/// Finds a <see cref="Nonce"/> that satisfies the given
/// <paramref name="difficulty"/>. This process is so-called
/// “<a
/// href="https://en.wikipedia.org/wiki/Cryptocurrency#Mining"
/// >mining</a>”.
/// </summary>
/// <param name="stamp">A callback to get a “stamp”
/// which is a <see cref="byte"/> array determined from a given
/// <see cref="Nonce"/> value.</param>
/// <param name="difficulty">The minimum required number of
/// leading zero bits that a returned answer needs to have.</param>
/// <returns>A <see cref="Nonce"/> value which satisfies the given
/// <paramref name="difficulty"/>.</returns>
/// <seealso cref="Stamp"/>
public static Nonce Answer(Stamp stamp, int difficulty)
{
var nonceBytes = new byte[10];
var random = new Random();
while (true)
{
random.NextBytes(nonceBytes);
var nonce = new Nonce(nonceBytes);
var digest = Hash(stamp(nonce));
if (digest.HasLeadingZeroBits(difficulty))
{
return(nonce);
}
}
}
/// <summary>
/// Finds a <see cref="Nonce"/> that satisfies the given
/// <paramref name="difficulty"/>. This process is so-called
/// “<a
/// href="https://en.wikipedia.org/wiki/Cryptocurrency#Mining"
/// >mining</a>”.
/// </summary>
/// <param name="stamp">A callback to get a “stamp”
/// which is a <see cref="byte"/> array determined from a given
/// <see cref="Nonce"/> value.</param>
/// <param name="difficulty">The minimum required number of
/// leading zero bits that a returned answer needs to have.</param>
/// <returns>A <see cref="Nonce"/> value which satisfies the given
/// <paramref name="difficulty"/>.</returns>
/// <seealso cref="Stamp"/>
public static Nonce Answer(Stamp stamp, uint difficulty)
{
int counter = 1;
while (true)
{
// FIXME: nonce should be generated by a proper random generator
var nonce = new Nonce(BitConverter.GetBytes(counter));
var digest = Hash(stamp(nonce));
if (digest.HasLeadingZeroBits(difficulty))
{
return(nonce);
}
counter++;
}
}
/// <summary>
/// Finds a <see cref="Nonce"/> that satisfies the given
/// <paramref name="difficulty"/>. This process is so-called
/// “<a
/// href="https://en.wikipedia.org/wiki/Cryptocurrency#Mining"
/// >mining</a>”.
/// </summary>
/// <param name="stamp">A callback to get a “stamp”
/// which is a <see cref="byte"/> array determined from a given
/// <see cref="Nonce"/> value.</param>
/// <param name="difficulty">A number to calculate the target number
/// for which the returned answer should be less than.</param>
/// <returns>A <see cref="Nonce"/> value which satisfies the given
/// <paramref name="difficulty"/>.</returns>
/// <seealso cref="Stamp"/>
public static Nonce Answer(Stamp stamp, long difficulty)
{
var nonceBytes = new byte[10];
var random = new Random();
while (true)
{
random.NextBytes(nonceBytes);
var nonce = new Nonce(nonceBytes);
var digest = Hash(stamp(nonce));
if (difficulty == 0)
{
return(nonce);
}
if (digest.Satisfies(difficulty))
{
return(nonce);
}
}
}
/// <summary>
/// Finds a <see cref="Nonce"/> that satisfies the given
/// <paramref name="difficulty"/>. This process is so-called
/// “<a
/// href="https://en.wikipedia.org/wiki/Cryptocurrency#Mining"
/// >mining</a>”.
/// </summary>
/// <param name="stamp">A callback to get a “stamp”
/// which is a <see cref="byte"/> array determined from a given
/// <see cref="Nonce"/> value.</param>
/// <param name="difficulty">A number to calculate the target number
/// for which the returned answer should be less than.</param>
/// <param name="cancellationToken">
/// A cancellation token used to propagate notification that this
/// operation should be canceled.
/// </param>
/// <returns>A <see cref="Nonce"/> value which satisfies the given
/// <paramref name="difficulty"/>.</returns>
/// <seealso cref="Stamp"/>
public static Nonce Answer(
Stamp stamp,
long difficulty,
CancellationToken cancellationToken = default(CancellationToken))
{
var nonceBytes = new byte[10];
var random = new Random();
while (!cancellationToken.IsCancellationRequested)
{
random.NextBytes(nonceBytes);
var nonce = new Nonce(nonceBytes);
var digest = Hash(stamp(nonce));
if (digest.Satisfies(difficulty))
{
return(nonce);
}
}
throw new OperationCanceledException(cancellationToken);
}