将字节编码的密钥转回 Bouncy Castle 中的原始 ECPublicKey
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19-09-2019 - |
题
在 Java 中,我有一个 ECDH 公钥,我将其作为字节数组发送。
一旦我收到字节数组,如何将其转回公钥?
我正在使用 Bouncy Castle,但 Java 解决方案也同样有用。
谢谢
其他提示
当你得到了编码的密钥,假设你使用默认 “[您密钥对] .getPublic()。的getEncoded()” 方法,这将工作。
X509EncodedKeySpec ks = new X509EncodedKeySpec(pubKeyByteString.toByteArray());
KeyFactory kf;
try {
kf = java.security.KeyFactory.getInstance("ECDH");
} catch (NoSuchAlgorithmException e) {
log.error("Cryptography error: could not initialize ECDH keyfactory!", e);
return;
}
ECPublicKey remotePublicKey;
try {
remotePublicKey = (ECPublicKey)kf.generatePublic(ks);
} catch (InvalidKeySpecException e) {
log.warn("Received invalid key specification from client",e);
return;
} catch (ClassCastException e) {
log.warn("Received valid X.509 key from client but it was not EC Public Key material",e);
return;
}
我发现@LaceCard上述方案并没有为我工作。一般地,这并不明显但随后又没有在密码学是)
String key = "MihU9ztW9sEvkBL6BxyaOMgkSbodNS8yoHaHcio+WE...blahblah"
byte[] keyBytes = Base64.decode(key);
//If using Android and Spongycastle provider should be "SC"
KeyFactory kf = KeyFactory.getInstance("ECDH", "BC");
//CURVE_NAME e.g prime192v1
ECParameterSpec ecSpec = ECNamedCurveTable.getParameterSpec(CURVE_NAME);
ECPoint point = ecSpec.getCurve().decodePoint(keyBytes);
ECPublicKeySpec pubSpec = new ECPublicKeySpec(point, ecSpec);
ECPublicKey myECPublicKey = (ECPublicKey) kf.generatePublic(pubSpec);
请注意:你需要妥善处理潜在的异常
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