如何解决如何构造一个 java.security.interfaces.RSAPublicKey?
我有以下字符串,据我所知是 RSA 公钥:
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAi+VPTFioJ3Dv/D6aEMqkiESiRkKBnISe3+K7vJDMAMqkTCfGz0jKInS5BXQUW9jRqkgBpSKdwizIWhCBOT3wGmgnm+L3bVwtTML52drqePSmQgfHAiWfcLdZuFGULtpy5nhaOAR5nzuDmDR8L0vumNbhqK+o9jbwSTbm8cfUsf7xHc7RX+bJinu5s566NtxqJ0y8U764BVPg96QLKpOEiNJUELarkdnljjdb12Gvs+631YFKAnUt5V9oHowBS1JDerlbhHKH6kYKEuVZfm5ofvhGQiUU69i9q/hO5Pb0eIZsogazERJmEIIvre8sQLNE71ti0WD3i7QDGlnsoai6EwIDAQAB
我需要从这个字符串构造一个 java.security.interfaces.RSAPublicKey
。首先,我尝试调用 RSAPublicKeyImpl.newKey(myString.getBytes(StandardCharsets.UTF_8))
,但这引发了以下异常:
java.security.InvalidKeyException: invalid key format
"sun.security.x509.X509Key.decode(X509Key.java:387)"
"sun.security.x509.X509Key.decode(X509Key.java:402)"
"sun.security.rsa.RSAPublicKeyImpl.<init>(RSAPublicKeyImpl.java:122)"
"sun.security.rsa.RSAPublicKeyImpl.newKey(RSAPublicKeyImpl.java:72)"
"com.myApp.getPublicKeyRsa(KeyLoader.java:33)"
然后,按照在线指南,我尝试使用此代码:
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
X509EncodedKeySpec pubSpec = new X509EncodedKeySpec(myString.getBytes(StandardCharsets.UTF_8));
keyFactory.generatePublic(pubSpec);
这抛出了一个非常相似的异常,只是包含在另一个异常中。
我在这里遗漏了什么明显的东西吗?如何构造 RSAPublicKey
?
解决方法
这个方法可以帮到你
public static PublicKey stringToPublicKey(String publicKeyString)
throws NoSuchAlgorithmException,NoSuchPaddingException,InvalidKeyException,IllegalBlockSizeException,BadPaddingException {
try {
if (publicKeyString.contains("-----BEGIN PUBLIC KEY-----") || publicKeyString.contains("-----END PUBLIC KEY-----"))
publicKeyString = publicKeyString.replace("-----BEGIN PUBLIC KEY-----","").replace("-----END PUBLIC KEY-----","");
byte[] keyBytes = Base64.decode(publicKeyString,Base64.DEFAULT);
X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
return keyFactory.generatePublic(spec);
} catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
e.printStackTrace();
return null;
}
}
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