diff options
author | David Hook <dgh@cryptoworkshop.com> | 2013-05-31 11:07:45 +0400 |
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committer | David Hook <dgh@cryptoworkshop.com> | 2013-05-31 11:07:45 +0400 |
commit | 2b976f5364cfdbc37d3086019d93483c983eb80b (patch) | |
tree | cb846af3fd1d43f9c2562a1fb2d06b997ad8f229 /core/src/main/java/org/bouncycastle/crypto/generators/DHKeyPairGenerator.java | |
parent | 5f714bd92fbd780d22406f4bc3681be005f6f04a (diff) |
initial reshuffle
Diffstat (limited to 'core/src/main/java/org/bouncycastle/crypto/generators/DHKeyPairGenerator.java')
-rw-r--r-- | core/src/main/java/org/bouncycastle/crypto/generators/DHKeyPairGenerator.java | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/generators/DHKeyPairGenerator.java b/core/src/main/java/org/bouncycastle/crypto/generators/DHKeyPairGenerator.java new file mode 100644 index 00000000..d07ca80d --- /dev/null +++ b/core/src/main/java/org/bouncycastle/crypto/generators/DHKeyPairGenerator.java @@ -0,0 +1,42 @@ +package org.bouncycastle.crypto.generators; + +import org.bouncycastle.crypto.AsymmetricCipherKeyPair; +import org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator; +import org.bouncycastle.crypto.KeyGenerationParameters; +import org.bouncycastle.crypto.params.DHKeyGenerationParameters; +import org.bouncycastle.crypto.params.DHParameters; +import org.bouncycastle.crypto.params.DHPrivateKeyParameters; +import org.bouncycastle.crypto.params.DHPublicKeyParameters; + +import java.math.BigInteger; + +/** + * a Diffie-Hellman key pair generator. + * + * This generates keys consistent for use in the MTI/A0 key agreement protocol + * as described in "Handbook of Applied Cryptography", Pages 516-519. + */ +public class DHKeyPairGenerator + implements AsymmetricCipherKeyPairGenerator +{ + private DHKeyGenerationParameters param; + + public void init( + KeyGenerationParameters param) + { + this.param = (DHKeyGenerationParameters)param; + } + + public AsymmetricCipherKeyPair generateKeyPair() + { + DHKeyGeneratorHelper helper = DHKeyGeneratorHelper.INSTANCE; + DHParameters dhp = param.getParameters(); + + BigInteger x = helper.calculatePrivate(dhp, param.getRandom()); + BigInteger y = helper.calculatePublic(dhp, x); + + return new AsymmetricCipherKeyPair( + new DHPublicKeyParameters(y, dhp), + new DHPrivateKeyParameters(x, dhp)); + } +} |