在Java中,我有一个ECDH公钥,我将其作为字节数组发送。
收到字节数组后,如何将其重新转换为公钥?
我正在使用Bouncy Castle,但Java解决方案同样有用。
由于
答案 0 :(得分:5)
当你得到编码密钥时,假设你使用了默认的“[your keyPair] .getPublic()。getEncoded()”方法,这将有效。
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;
}
答案 1 :(得分:4)
我发现@LaceCard的上述解决方案对我不起作用。一般来说,这并不明显,但密码学中没有任何内容;)
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);
注意:您需要妥善处理潜在的异常
答案 2 :(得分:-1)
如何为ECDH密钥格式化原始字节?你在哪里获得原始字节?
通常,使用适当的* Spec类将原始密钥材料转换为Key,但ECPublicKeySpec和DHPublicKeySpec类不接受原始字节数组。