已经生成了如下私钥:
fun getKeyPair(): Pair<ByteArray, ByteArray> {
Security.addProvider(provider)
val generator = KeyPairGenerator.getInstance("ECDSA")
val ecSpec = ECNamedCurveTable.getParameterSpec("secp256r1")
generator.initialize(ecSpec)
val keyPair = generator.generateKeyPair()
val publicKey = keyPair.public as ECPublicKey
val privateKey = keyPair.private
return Pair(publicKey.q.getEncoded(true), privateKey.getEncoded())
}
可以再次像这样重新构建公钥:
Security.addProvider(...spongy castle provider)
val ecSpecs = ECNamedCurveTable.getParameterSpec("secp256r1")
val q = ecSpecs.curve.decodePoint(publicKeyEncoded)
val pubSpec = ECPublicKeySpec(q, ecSpecs)
val keyFactory = KeyFactory.getInstance("ECDSA")
val generatedPublic = keyFactory.generatePublic(pubSpec)
如何同时从字节中重建私钥?
更新:
此代码在实际应用中效果很好,但在JUnit测试中却无效:
val keyFactory = KeyFactory.getInstance("ECDSA")
val privSpec = PKCS8EncodedKeySpec(privateEncoded)
val generatedPrivate = keyFactory.generatePrivate(privSpec)
在JUnit测试中,我收到此错误:
java.security.spec.InvalidKeySpecException: encoded key spec not recognised
我的私钥为编码字节,大小为150个字节。
答案 0 :(得分:3)
由于密钥是使用标准Key.getEncoded()
编码的,因此以下标准解决方案应该可以工作:
val keyFactory = KeyFactory.getInstance("EC")
val privSpec = PKCS8EncodedKeySpec(privateEncoded)
val generatedPrivate = keyFactory.generatePrivate(privSpec)
编码后的密钥应包含重建私有密钥所需的所有必需信息,而无需指定其他参数,就像您需要为简化的公共密钥所做的那样。