Thank you very much! Seeing your ArrayUtils.reverse clarified what the issue was for me.
When I reversed the hash, I turned "1234" into "4321", where as it should have been "3412".
Topic: How to verify ECDSA of a sample litecoin tx using pycoin? (Read 5065 times)
Should work with the hash reversed
Code:
Security.addProvider(new BouncyCastleProvider())
val bigR = BigInt(Hex.decode("258ad2725e66da0ae9825bb849a8e73f86e4767cf256c9fae44d18fbc1aacc2e"))
val bigS = BigInt(Hex.decode("406638a5b3369bb83d8a4f38a17b2f048c1495ebfd6fdff1a8c7b268e07f69cd"))
val pub = Hex.decode("03ec539eb3d882c07575f6143d891c18d580cd9d2726add0d71d262f2f6f2d4ccf")
val hash = Hex.decode("eed300fc63a973b668af66af746fde378ec6556f4b330ec1eeccc6a77aa535b0")
ArrayUtils.reverse(hash)
val f = KeyFactory.getInstance("ECDSA", "BC");
val ecSpec = ECNamedCurveTable.getParameterSpec("secp256k1")
val ecDomain = new ECDomainParameters(ecSpec.getCurve, ecSpec.getG, ecSpec.getN)
val signer = new ECDSASigner
val pubKey = ecSpec.getCurve().decodePoint(pub)
val params = new ECPublicKeyParameters(pubKey, ecDomain)
signer.init(false, params)
val check = signer.verifySignature(hash, bigR.bigInteger, bigS.bigInteger)
println(bigR, bigS)
println(pubKey)
println(Hex.toHexString(hash))
println(check)
Code:
(16980852742628685644910148209432903671752523748137798365042615749252787915822,29128631674996429161026020280872095602306489412358940898112602484852964420045)
(ec539eb3d882c07575f6143d891c18d580cd9d2726add0d71d262f2f6f2d4ccf,227874efbedb02b88568b55106634b9b4e3eca128ab46fa98abe7066aece0a51,1)
b035a57aa7c6cceec10e334b6f55c68e37de6f74af66af68b673a963fc00d3ee
true
I had not tried reversing the hash. I tried, still no luck.
Thank you, though.
Thank you, though.
Did you try reversing the bytes of the hash? The ToString() seems to be flipping them.
The question is laid out here: http://bitcoin.stackexchange.com/questions/32194/how-to-verify-ecdsa-of-a-sample-litecoin-tx-using-pycoin
Looking for some help, might even give a BTC tip for a really good answer!
Looking for some help, might even give a BTC tip for a really good answer!
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