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Add convenience constructor to KeyCrypterScrypt to allow setting the number of scrypt iterations. The default of 16384 is not usable on mobile devices.

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Andreas Schildbach 2014-03-09 20:58:56 +01:00 committed by Mike Hearn
parent 4f8867c58e
commit 85d8145924
1 changed files with 23 additions and 4 deletions
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27
core/src/main/java/com/google/bitcoin/crypto/KeyCrypterScrypt.java
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@ -1,5 +1,6 @@
/**
* Copyright 2013 Jim Burton.
* Copyright 2014 Andreas Schildbach
*
* Licensed under the MIT license (the "License");
* you may not use this file except in compliance with the License.
@ -70,16 +71,34 @@ public class KeyCrypterScrypt implements KeyCrypter, Serializable {
private static final transient SecureRandom secureRandom = new SecureRandom();
private static byte[] randomSalt() {
byte[] salt = new byte[SALT_LENGTH];
secureRandom.nextBytes(salt);
return salt;
}
// Scrypt parameters.
private final transient ScryptParameters scryptParameters;
/**
* Encryption/ Decryption using default parameters and a random salt
* Encryption/Decryption using default parameters and a random salt.
*/
public KeyCrypterScrypt() {
byte[] salt = new byte[SALT_LENGTH];
secureRandom.nextBytes(salt);
Protos.ScryptParameters.Builder scryptParametersBuilder = Protos.ScryptParameters.newBuilder().setSalt(ByteString.copyFrom(salt));
Protos.ScryptParameters.Builder scryptParametersBuilder = Protos.ScryptParameters.newBuilder().setSalt(
ByteString.copyFrom(randomSalt()));
this.scryptParameters = scryptParametersBuilder.build();
}
/**
* Encryption/Decryption using custom number of iterations parameters and a random salt. A useful value for mobile
* devices is 512 (~500 ms).
*
* @param iterations
* number of scrypt iterations
*/
public KeyCrypterScrypt(int iterations) {
Protos.ScryptParameters.Builder scryptParametersBuilder = Protos.ScryptParameters.newBuilder()
.setSalt(ByteString.copyFrom(randomSalt())).setN(iterations);
this.scryptParameters = scryptParametersBuilder.build();
}