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Add triple Diffie-Hellman key agreement.

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This commit is contained in:
akwizgran
2019-03-15 14:04:16 +00:00
parent 84060a57da
commit 44d2526997
3 changed files with 73 additions and 9 deletions
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22
bramble-api/src/main/java/org/briarproject/bramble/api/crypto/CryptoComponent.java
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@@ -34,8 +34,7 @@ public interface CryptoComponent {
SecretKey deriveKey(String label, SecretKey k, byte[]... inputs);
/**
* Derives a common shared secret from two public keys and one of the
* corresponding private keys.
* Derives a shared secret from two key pairs.
*
* @param label a namespaced label indicating the purpose of this shared
* secret, to prevent it from being repurposed or colliding with a shared
@@ -48,6 +47,25 @@ public interface CryptoComponent {
KeyPair ourKeyPair, byte[]... inputs)
throws GeneralSecurityException;
/**
* Derives a shared secret from two static and two ephemeral key pairs.
*
* @param label a namespaced label indicating the purpose of this shared
* secret, to prevent it from being repurposed or colliding with a shared
* secret derived for another purpose
* @param theirStaticPublicKey the static public key of the remote party
* @param theirEphemeralPublicKey the ephemeral public key of the remote
* party
* @param ourStaticKeyPair the static key pair of the local party
* @param ourEphemeralKeyPair the ephemeral key pair of the local party
* @param alice true if the local party is Alice
* @return the shared secret
*/
SecretKey deriveSharedSecret(String label, PublicKey theirStaticPublicKey,
PublicKey theirEphemeralPublicKey, KeyPair ourStaticKeyPair,
KeyPair ourEphemeralKeyPair, boolean alice, byte[]... inputs)
throws GeneralSecurityException;
/**
* Signs the given byte[] with the given private key.
*