Generating RSA keys in PKCS#1 format in Java--转
原文地址:https://stackoverflow.com/questions/7611383/generating-rsa-keys-in-pkcs1-format-in-java
When I generate an RSA key pair using the Java API, the public key is encoded in the X.509 format and the private key is encoded in the PKCS#8 format. I'm looking to encode both as PKCS#1. Is this possible? I've spent a considerable amount of time going through the Java docs but haven't found a solution. The result is the same when I use the Java and the Bouncy Castle providers.
Here is a snippet of the code:
KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA","BC");
keygen.initialize(1024);
KeyPair pair = keygen.generateKeyPair();
PrivateKey priv = pair.getPrivate();
PublicKey pub = pair.getPublic();
byte[] privBytes = priv.getEncoded();
byte[] pubBytes = pub.getEncoded();
The two resulting byte arrays are formatted as X.509 (public) and PKCS#8 (private).
Any help would be much appreciated. There are some similar posts but none really answer my question.
Thank You
You will need BouncyCastle:
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemWriter;
The code snippets below have been checked and found working with Bouncy Castle 1.52.
Private key
Convert private key from PKCS8 to PKCS1:
PrivateKey priv = pair.getPrivate();
byte[] privBytes = priv.getEncoded();
PrivateKeyInfo pkInfo = PrivateKeyInfo.getInstance(privBytes);
ASN1Encodable encodable = pkInfo.parsePrivateKey();
ASN1Primitive primitive = encodable.toASN1Primitive();
byte[] privateKeyPKCS1 = primitive.getEncoded();
Convert private key in PKCS1 to PEM:
PemObject pemObject = new PemObject("RSA PRIVATE KEY", privateKeyPKCS1);
StringWriter stringWriter = new StringWriter();
PemWriter pemWriter = new PemWriter(stringWriter);
pemWriter.writeObject(pemObject);
pemWriter.close();
String pemString = stringWriter.toString();
Check with command line OpenSSL that the key format is as expected:
openssl rsa -in rsa_private_key.pem -noout -text
Public key
Convert public key from X.509 SubjectPublicKeyInfo to PKCS1:
PublicKey pub = pair.getPublic();
byte[] pubBytes = pub.getEncoded();
SubjectPublicKeyInfo spkInfo = SubjectPublicKeyInfo.getInstance(pubBytes);
ASN1Primitive primitive = spkInfo.parsePublicKey();
byte[] publicKeyPKCS1 = primitive.getEncoded();
Convert public key in PKCS1 to PEM:
PemObject pemObject = new PemObject("RSA PUBLIC KEY", publicKeyPKCS1);
StringWriter stringWriter = new StringWriter();
PemWriter pemWriter = new PemWriter(stringWriter);
pemWriter.writeObject(pemObject);
pemWriter.close();
String pemString = stringWriter.toString();
Check with command line OpenSSL that the key format is as expected:
openssl rsa -in rsa_public_key.pem -RSAPublicKey_in -noout -text
Thanks
Many thanks to the authors of the following posts:
- https://stackoverflow.com/a/8713518/1016580
- https://stackoverflow.com/a/14052651/1016580
- https://stackoverflow.com/a/14068057/1016580
Those posts contained useful, though sometimes outdated info (i.e. for older versions of BouncyCastle), that helped me to construct this post.
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