|
Title: implement Bitcoin Core?s signmessage command Post by: davidjim on March 16, 2016, 09:30:36 AM How do I implement Bitcoin Core?s signmessage command in Java?
In order to get a signature, I used the following code: ECKey key = ECKey.fromPrivate("morR2S8NfjiphGnGWwXuSXPoW9pRM9Du9h".getBytes()); String signature = key.signMessage(?create 225015613080074076?); But I got the following exception. I don't know why? java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native Method) at org.spongycastle.crypto.signers.HMacDSAKCalculator.init(HMacDSAKCalculator.java:58) at org.spongycastle.crypto.signers.ECDSASigner.generateSignature(ECDSASigner.java:94) at org.bitcoinj.core.ECKey.doSign(ECKey.java:629) at org.bitcoinj.core.ECKey.sign(ECKey.java:619) at org.bitcoinj.core.ECKey.signMessage(ECKey.java:769) at org.bitcoinj.core.ECKey.signMessage(ECKey.java:756) at com.am.coinspark.service.MessageCreate.getSignature(MessageCreate.java:115) at com.am.coinspark.service.MessageCreate.main(MessageCreate.java:94) Title: Re: implement Bitcoin Core?s signmessage command Post by: tonytumble on March 16, 2016, 01:52:52 PM How do I implement Bitcoin Core?s signmessage command in Java? In order to get a signature, I used the following code: ECKey key = ECKey.fromPrivate("morR2S8NfjiphGnGWwXuSXPoW9pRM9Du9h".getBytes()); String signature = key.signMessage(?create 225015613080074076?); But I got the following exception. I don't know why? java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native Method) at org.spongycastle.crypto.signers.HMacDSAKCalculator.init(HMacDSAKCalculator.java:58) at org.spongycastle.crypto.signers.ECDSASigner.generateSignature(ECDSASigner.java:94) at org.bitcoinj.core.ECKey.doSign(ECKey.java:629) at org.bitcoinj.core.ECKey.sign(ECKey.java:619) at org.bitcoinj.core.ECKey.signMessage(ECKey.java:769) at org.bitcoinj.core.ECKey.signMessage(ECKey.java:756) at com.am.coinspark.service.MessageCreate.getSignature(MessageCreate.java:115) at com.am.coinspark.service.MessageCreate.main(MessageCreate.java:94) follow this instructions: http://bitcoin.stackexchange.com/questions/42245/eckey-ecdsasignature-creation here is the explicit method description: https://bitcoinj.github.io/javadoc/0.12/org/bitcoinj/core/ECKey.html#signMessage-java.lang.String- hope it s clear now. |