diff options
Diffstat (limited to 'crypto/src/util/Arrays.cs')
| -rw-r--r-- | crypto/src/util/Arrays.cs | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/crypto/src/util/Arrays.cs b/crypto/src/util/Arrays.cs new file mode 100644 index 000000000..3c083034e --- /dev/null +++ b/crypto/src/util/Arrays.cs @@ -0,0 +1,233 @@ +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; + } + } + + public static byte[] Copy(byte[] data, int off, int len) + { + byte[] result = new byte[len]; + Array.Copy(data, off, result, 0, len); + return result; + } + } +} |