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58 lines
1.3 KiB
58 lines
1.3 KiB
2 months ago
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using System;
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using Org.BouncyCastle.Crypto.Parameters;
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namespace Org.BouncyCastle.Crypto.Generators
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{
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public class DesKeyGenerator
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: CipherKeyGenerator
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{
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public DesKeyGenerator()
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{
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}
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internal DesKeyGenerator(
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int defaultStrength)
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: base(defaultStrength)
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{
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}
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/**
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* initialise the key generator - if strength is set to zero
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* the key generated will be 64 bits in size, otherwise
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* strength can be 64 or 56 bits (if you don't count the parity bits).
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*
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* @param param the parameters to be used for key generation
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*/
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protected override void engineInit(
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KeyGenerationParameters parameters)
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{
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base.engineInit(parameters);
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if (strength == 0 || strength == (56 / 8))
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{
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strength = DesParameters.DesKeyLength;
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}
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else if (strength != DesParameters.DesKeyLength)
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{
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throw new ArgumentException(
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"DES key must be " + (DesParameters.DesKeyLength * 8) + " bits long.");
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}
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}
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protected override byte[] engineGenerateKey()
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{
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byte[] newKey = new byte[DesParameters.DesKeyLength];
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do
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{
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random.NextBytes(newKey);
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DesParameters.SetOddParity(newKey);
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}
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while (DesParameters.IsWeakKey(newKey, 0));
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return newKey;
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}
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}
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}
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