1 files changed, 57 insertions, 0 deletions
diff --git a/Crypto/src/crypto/generators/DesKeyGenerator.cs b/Crypto/src/crypto/generators/DesKeyGenerator.cs
new file mode 100644
index 000000000..154e3471a
--- /dev/null
+++ b/Crypto/src/crypto/generators/DesKeyGenerator.cs
@@ -0,0 +1,57 @@
+using System;
+
+using Org.BouncyCastle.Crypto.Parameters;
+
+namespace Org.BouncyCastle.Crypto.Generators
+{
+ public class DesKeyGenerator
+ : CipherKeyGenerator
+ {
+ public DesKeyGenerator()
+ {
+ }
+
+ internal DesKeyGenerator(
+ int defaultStrength)
+ : base(defaultStrength)
+ {
+ }
+
+ /**
+ * initialise the key generator - if strength is set to zero
+ * the key generated will be 64 bits in size, otherwise
+ * strength can be 64 or 56 bits (if you don't count the parity bits).
+ *
+ * @param param the parameters to be used for key generation
+ */
+ protected override void engineInit(
+ KeyGenerationParameters parameters)
+ {
+ base.engineInit(parameters);
+
+ if (strength == 0 || strength == (56 / 8))
+ {
+ strength = DesParameters.DesKeyLength;
+ }
+ else if (strength != DesParameters.DesKeyLength)
+ {
+ throw new ArgumentException(
+ "DES key must be " + (DesParameters.DesKeyLength * 8) + " bits long.");
+ }
+ }
+
+ protected override byte[] engineGenerateKey()
+ {
+ byte[] newKey;
+
+ do
+ {
+ newKey = random.GenerateSeed(DesParameters.DesKeyLength);
+ DesParameters.SetOddParity(newKey);
+ }
+ while (DesParameters.IsWeakKey(newKey, 0));
+
+ return newKey;
+ }
+ }
+}
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