关于ssl：如何从RSA Privatekey.pem文件中获取java.security.PrivateKey对象？

How to get the java.security.PrivateKey object from RSA Privatekey.pem file?

有一个私人的RSA密钥文件(ockey.pem)。我用Java from this to get the key的私人文件。using the key is generated this below OpenSSL命令行。注释：on this change anything我OpenSSL命令行的下面。P＞＜／

1	openssl> req -newkey rsa:1024 -sha1 -keyout OCkey.pem -out OCreq.pem -subj"/C=country/L=city/O=OC/OU=myLab/CN=OCserverName/" -config req.conf

如何看样below the认证。P＞＜／

///////////////////////////////////////////////////////////
bash-3.00$ less OCkey.pem
-----BEGIN RSA PRIVATE KEY----- Proc-Type: 4,ENCRYPTED DEK-Info: DES-EDE3-CBC,EA1DBF8D142621BF

BYyZuqyqq9+L0UT8UxwkDHX7P7YxpKugTXE8NCLQWhdS3EksMsv4xNQsZSVrJxE3
Ft9veWuk+PlFVQG2utZlWxTYsUVIJg4KF7EgCbyPbN1cyjsi9FMfmlPXQyCJ72rd
... ...
cBlG80PT4t27h01gcCFRCBGHxiidh5LAATkApZMSfe6BBv4hYjkCmg==
-----END RSA PRIVATE KEY----- //////////////////////////////////////////////////////////////

就是我跟随P＞＜／

1 2	byte[] privKeyBytes = new byte[(int)new File("C:/OCkey.pem").length()]; PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(privKeyBytes));

但要P＞＜／

"java.security.spec.InvalidKeySpecException:
java.security.InvalidKeyException: invalid key format"

Please help。P＞＜／

相关讨论

确保privatekey为der格式，并且您使用的是正确的keyspec。我相信你应该在这里使用pkcs8作为privkeybytes

首先，需要将私钥转换为二进制DER格式。下面介绍如何使用openssl：

1	openssl pkcs8 -topk8 -inform PEM -outform DER -in private_key.pem -out private_key.der -nocrypt

最后，

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public static PrivateKey getPrivateKey(String filename) throws Exception {

File f = new File(filename);
FileInputStream fis = new FileInputStream(f);
DataInputStream dis = new DataInputStream(fis);
byte[] keyBytes = new byte[(int) f.length()];
dis.readFully(keyBytes);
dis.close();

PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory kf = KeyFactory.getInstance("RSA");
return kf.generatePrivate(spec);
}