Class CertAndKeyGen
This provides some simple certificate management functionality. Specifically, it allows you to create self-signed X.509 certificates as well as PKCS 10 based certificate signing requests.
Keys for some public key signature algorithms have algorithm parameters, such as DSS/DSA. Some sites' Certificate Authorities adopt fixed algorithm parameters, which speeds up some operations including key generation and signing. At this time, this interface does not provide a way to provide such algorithm parameters, e.g. by providing the CA certificate which includes those parameters.
Also, note that at this time only signature-capable keys may be acquired through this interface. Diffie-Hellman keys, used for secure key exchange, may be supported later.
- Version:
- 1.44
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate KeyPairGenerator
private PrivateKey
private X509Key
private String
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Constructor Summary
ConstructorsConstructorDescriptionCertAndKeyGen
(String keyType, String sigAlg) Creates a CertAndKeyGen object for a particular key type and signature algorithm. -
Method Summary
Modifier and TypeMethodDescriptionvoid
generate
(int keyBits) Generates a random public/private key pair, with a given key size.getCertRequest
(X500Name myname) Returns a PKCS #10 certificate request.Returns the private key of the generated key pair.Returns the public key of the generated key pair.getSelfCertificate
(X500Name myname, long validity) Returns a self-signed X.509v3 certificate for the public key.private X500Signer
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Field Details
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sigAlg
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keyGen
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publicKey
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privateKey
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Constructor Details
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CertAndKeyGen
Creates a CertAndKeyGen object for a particular key type and signature algorithm.- Parameters:
keyType
- type of key, e.g. "RSA", "DSA"sigAlg
- name of the signature algorithm, e.g. "MD5WithRSA", "MD2WithRSA", "SHAwithDSA".- Throws:
NoSuchAlgorithmException
- on unrecognized algorithms.
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Method Details
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generate
Generates a random public/private key pair, with a given key size. Different algorithms provide different degrees of security for the same key size, because of the "work factor" involved in brute force attacks. As computers become faster, it becomes easier to perform such attacks. Small keys are to be avoided.Note that not all values of "keyBits" are valid for all algorithms, and not all public key algorithms are currently supported for use in X.509 certificates. If the algorithm you specified does not produce X.509 compatible keys, an invalid key exception is thrown.
- Parameters:
keyBits
- the number of bits in the keys.- Throws:
InvalidKeyException
- if the environment does not provide X.509 public keys for this signature algorithm.
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getPublicKey
Returns the public key of the generated key pair. -
getPrivateKey
Returns the private key of the generated key pair.Be extremely careful when handling private keys. When private keys are not kept secret, they lose their ability to securely authenticate specific entities ... that is a huge security risk!
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getSelfCertificate
public X509Certificate getSelfCertificate(X500Name myname, long validity) throws CertificateException, InvalidKeyException, SignatureException, NoSuchAlgorithmException, NoSuchProviderException Returns a self-signed X.509v3 certificate for the public key. The certificate is immediately valid. No extensions.Such certificates normally are used to identify a "Certificate Authority" (CA). Accordingly, they will not always be accepted by other parties. However, such certificates are also useful when you are bootstrapping your security infrastructure, or deploying system prototypes.
- Parameters:
myname
- X.500 name of the subject (who is also the issuer)validity
- how long the certificate should be valid, in seconds- Throws:
CertificateException
- on certificate handling errors.InvalidKeyException
- on key handling errors.SignatureException
- on signature handling errors.NoSuchAlgorithmException
- on unrecognized algorithms.NoSuchProviderException
- on unrecognized providers.
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getCertRequest
Returns a PKCS #10 certificate request. The caller uses eitherPKCS10.print
orPKCS10.toByteArray
operations on the result, to get the request in an appropriate transmission format.PKCS #10 certificate requests are sent, along with some proof of identity, to Certificate Authorities (CAs) which then issue X.509 public key certificates.
- Parameters:
myname
- X.500 name of the subject- Throws:
InvalidKeyException
- on key handling errors.SignatureException
- on signature handling errors.
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getSigner
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