android-如何从以前生成的ECDSA两个编码密钥对构造私钥?
作者:互联网
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())
}
可以再次重新构造公用密钥,如下所示:
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)
与此同时如何从字节中重建私钥呢?
更新:
该代码在实际应用中运行良好,但在JUnit测试中却无法:
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
我的私钥已编码为150个字节.
解决方法:
由于密钥是使用标准Key.getEncoded()进行编码的,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专用密钥所需的所有必需信息,而无需指定其他参数,就像您需要对简化的公用密钥进行操作一样.
标签:kotlin,ecdsa,cryptography,bouncycastle,android 来源: https://codeday.me/bug/20191108/2007421.html