[英]Web3j ECKeyPair to KeyPair
我正在嘗試使用web3j使用生成的密鑰創建ECC。 我有ECKeyPair對象,但cipher.init()
要求第二個參數是Key
對象。 ECKeyPair返回私鑰和公鑰的BigInteger
,如何將它們轉換為包含PrivateKey
和PublicKey
對象的KeyPair
?
我試過了(參考: CryptoUtil.java ):
private fun decodeKeyPair(ecKeyPair: ECKeyPair): KeyPair {
val xp = getNamedCurveByName("secp256k1")
val p = ECNamedCurveSpec("secp256k1", xp.curve, xp.g, xp.n, xp.h, null)
val curve = convertCurve(p.curve)
val g = EC5Util.convertPoint(curve, p.generator, false)
val n = p.order
val h = BigInteger.valueOf(p.cofactor.toLong())
val dp = ECDomainParameters(curve, g, n, h)
val bytes = Numeric.toBytesPadded(ecKeyPair.publicKey, 64)
val x = Numeric.toBigInt(Arrays.copyOfRange(bytes, 0, 32))
val y = Numeric.toBigInt(Arrays.copyOfRange(bytes, 32, 64))
val q = curve.createPoint(x, y)
val publicKey = BCECPublicKey(
"EC",
ECPublicKeyParameters(q, dp),
BouncyCastleProvider.CONFIGURATION
)
val privateKey = BCECPrivateKey(
"EC",
ECPrivateKeyParameters(ecKeyPair.privateKey, dp),
publicKey,
p,
BouncyCastleProvider.CONFIGURATION
)
return KeyPair(publicKey, privateKey)
}
但是這會返回一個錯誤: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'org.bouncycastle.math.ec.ECCurve org.bouncycastle.jce.spec.ECParameterSpec.getCurve()' on a null object reference
有沒有其他方法將Web3j ECKeyPair轉換為KeyPair
?
我在探索https://www.programcreek.com后終於得到了它。 這里的主要內容是“如何使用公鑰字符串生成ECPoint”。
這是我如何做到的,而不是轉換整個EcKeyPair
對象,我分別轉換鍵。
ECPublicKey
公鑰字符串:
private fun toEcPublicKey(publicKey: String): ECPublicKey {
val params = ECNamedCurveTable.getParameterSpec("secp256k1")
val curveSpec = ECNamedCurveSpec("secp256k1", params.curve, params.g, params.n)
//This is the part how to generate ECPoint manually from public key string.
val pubKeyX = publicKey.substring(0, publicKey.length / 2)
val pubKeyY = publicKey.substring(publicKey.length / 2)
val ecPoint = ECPoint(BigInteger(pubKeyX, 16), BigInteger(pubKeyY, 16))
val params2 = EC5Util.convertSpec(curveSpec.curve, params)
val keySpec = java.security.spec.ECPublicKeySpec(ecPoint, params2)
val factory = KeyFactory.getInstance("ECDSA")
return factory.generatePublic(keySpec) as ECPublicKey
}
ECPrivateKey
私鑰字符串:
private fun toEcPrivateKey(privateKey: String): ECPrivateKey {
val ecKeyPair = ECKeyPair.create(Numeric.hexStringToByteArray(privateKey))
val params = ECNamedCurveTable.getParameterSpec("secp256k1")
val curveSpec = ECNamedCurveSpec("secp256k1", params.curve, params.g, params.n)
val keySpec = java.security.spec.ECPrivateKeySpec(
ecKeyPair.privateKey,
curveSpec)
val factory = KeyFactory.getInstance("ECDSA")
return factory.generatePrivate(keySpec) as ECPrivateKey
}
字符串鍵輸入是從Web3j庫生成的。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.