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using System;
using System.Text;
namespace Org.BouncyCastle.Utilities
{
/// <summary> General array utilities.</summary>
public sealed class Arrays
{
private Arrays()
{
}
public static bool AreEqual(
bool[] a,
bool[] b)
{
if (a == b)
return true;
if (a == null || b == null)
return false;
return HaveSameContents(a, b);
}
public static bool AreEqual(
char[] a,
char[] b)
{
if (a == b)
return true;
if (a == null || b == null)
return false;
return HaveSameContents(a, b);
}
/// <summary>
/// Are two arrays equal.
/// </summary>
/// <param name="a">Left side.</param>
/// <param name="b">Right side.</param>
/// <returns>True if equal.</returns>
public static bool AreEqual(
byte[] a,
byte[] b)
{
if (a == b)
return true;
if (a == null || b == null)
return false;
return HaveSameContents(a, b);
}
[Obsolete("Use 'AreEqual' method instead")]
public static bool AreSame(
byte[] a,
byte[] b)
{
return AreEqual(a, b);
}
/// <summary>
/// A constant time equals comparison - does not terminate early if
/// test will fail.
/// </summary>
/// <param name="a">first array</param>
/// <param name="b">second array</param>
/// <returns>true if arrays equal, false otherwise.</returns>
public static bool ConstantTimeAreEqual(
byte[] a,
byte[] b)
{
int i = a.Length;
if (i != b.Length)
return false;
int cmp = 0;
while (i != 0)
{
--i;
cmp |= (a[i] ^ b[i]);
}
return cmp == 0;
}
public static bool AreEqual(
int[] a,
int[] b)
{
if (a == b)
return true;
if (a == null || b == null)
return false;
return HaveSameContents(a, b);
}
private static bool HaveSameContents(
bool[] a,
bool[] b)
{
int i = a.Length;
if (i != b.Length)
return false;
while (i != 0)
{
--i;
if (a[i] != b[i])
return false;
}
return true;
}
private static bool HaveSameContents(
char[] a,
char[] b)
{
int i = a.Length;
if (i != b.Length)
return false;
while (i != 0)
{
--i;
if (a[i] != b[i])
return false;
}
return true;
}
private static bool HaveSameContents(
byte[] a,
byte[] b)
{
int i = a.Length;
if (i != b.Length)
return false;
while (i != 0)
{
--i;
if (a[i] != b[i])
return false;
}
return true;
}
private static bool HaveSameContents(
int[] a,
int[] b)
{
int i = a.Length;
if (i != b.Length)
return false;
while (i != 0)
{
--i;
if (a[i] != b[i])
return false;
}
return true;
}
public static string ToString(
object[] a)
{
StringBuilder sb = new StringBuilder('[');
if (a.Length > 0)
{
sb.Append(a[0]);
for (int index = 1; index < a.Length; ++index)
{
sb.Append(", ").Append(a[index]);
}
}
sb.Append(']');
return sb.ToString();
}
public static int GetHashCode(
byte[] data)
{
if (data == null)
{
return 0;
}
int i = data.Length;
int hc = i + 1;
while (--i >= 0)
{
hc *= 257;
hc ^= data[i];
}
return hc;
}
public static byte[] Clone(
byte[] data)
{
return data == null ? null : (byte[]) data.Clone();
}
public static int[] Clone(
int[] data)
{
return data == null ? null : (int[]) data.Clone();
}
public static void Fill(
byte[] buf,
byte b)
{
int i = buf.Length;
while (i > 0)
{
buf[--i] = b;
}
}
}
}
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