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Class iaik.security.rsa.RSAPrivateKey

java.lang.Object
   |
   +----iaik.security.rsa.RSAKey
           |
           +----iaik.security.rsa.RSAPrivateKey

public class RSAPrivateKey

extends RSAKey

implements RSAPrivateKey, Serializable

See Also:

Key, PublicKey, PrivateKey, RSAPublicKey

RSAPrivateKey(ASN1Object)

Creates a new private key from an ASN1Object.

RSAPrivateKey(BigInteger, BigInteger, BigInteger)

Creates a private key from the given values.

RSAPrivateKey(BigInteger, BigInteger, BigInteger, BigInteger, BigInteger, BigInteger, BigInteger, BigInteger)

Creates a private key from the given values.

RSAPrivateKey(byte[])

Creates a new private key from a DER or PEM encoded ASN.1 datastructure.

RSAPrivateKey(String)

Creates a new private key from a DER or PEM file.

crypt(BigInteger)

Encrypt or decrypt a BigInteger using the private key.This method uses a fast algorithm based on the chinese remainder theorem.

decrypt(String)

Decrypt an encrypted PrivateKeyInfo (PKCS#5 and PKCS#8).

encrypt(String, AlgorithmID)

Encrypt the PrivateKeyInfo data structure (PKCS#5 and PKCS#8).

getAlgorithm()

Returns the name of the algorithm: RSA.

getCodingFormat()

Returns the coding format.

getEncoded()

Returns the encoded private key: The ASN.1 type is "SubjectPublicKeyInfo" and the coding is DER.

getEncryptionAlgorithm()

Returns the encryption algorithm or null, if this RSAPrivateKey is not encrypted.

getExponent()

Returns the private exponent of this private key.

getFormat()

Returns the name of the encoding format: X.509.

getModulus()

Returns the modulus of this private key.

getPublicExponent()

Returns the public exponent of this private key.

getPublicKey()

Returns the public parts of this private key.

saveToFile(String)

Saves this private key into a file.

setCodingFormat(int)

Sets the format for saveToFile(), getEncoded() and toByteArray().

toString()

Returns a string that represents the contents of this private key.

 public RSAPrivateKey(BigInteger privateExponent,
                      BigInteger publicExponent,
                      BigInteger modulus)

Creates a private key from the given values.

Parameters:

privateExponent - the private exponent

publicExponent - the public exponent

modulus - the modulus

 public RSAPrivateKey(BigInteger prime1,
                      BigInteger prime2,
                      BigInteger exponent1,
                      BigInteger exponent2,
                      BigInteger coefficient,
                      BigInteger privateExponent,
                      BigInteger publicExponent,
                      BigInteger modulus)

Creates a private key from the given values.

Parameters:

prime1 - first prime factor of the modulus

prime2 - second prime factor of the modulus

exponent1 - privateExponent mod (prime1-1)

exponent2 - privateExponent mod (prime2-1)

coefficient - multiplic inverse of prime1 mod prime2

privateExponent - the private exponent

publicExponent - the public exponent

modulus - the modulus

 public RSAPrivateKey(byte pk[]) throws InvalidKeyException

Creates a new private key from a DER or PEM encoded ASN.1 datastructure. The following ASN.1 types are suported for the private key:

• RSAPrivateKey
• PrivateKeyInfo
• EncryptedPrivateKeyInfo

Parameters:

pk - the private key

Throws: InvalidKeyException

if something is wrong with the key encoding

 public RSAPrivateKey(ASN1Object obj) throws InvalidKeyException

Creates a new private key from an ASN1Object. The ASN1Object can be of the following type:

• RSAPrivateKey
• PrivateKeyInfo
• EncryptedPrivateKeyInfo

Parameters:

obj - the private key as ASN1Object

Throws: InvalidKeyException

if something is wrong with the key encoding

 public RSAPrivateKey(String fileName) throws IOException, InvalidKeyException

Creates a new private key from a DER or PEM file.

Parameters:

fileName - the key file name

Throws: InvalidKeyException

if something is wrong with the key encoding

Throws: IOException

if something is wrong with the file

 public BigInteger crypt(BigInteger message)

Encrypt or decrypt a BigInteger using the private key.This method uses a fast algorithm based on the chinese remainder theorem.

Parameters:

message - the BigInteger to encrypt or encrypt

Returns:

the encrypted or decrypted message

Overrides:

crypt in class RSAKey

 public void decrypt(String password)

Decrypt an encrypted PrivateKeyInfo (PKCS#5 and PKCS#8).

Parameters:

password - the password to decrypt the key

 public void encrypt(String password,
                     AlgorithmID encAlgorithm) throws NoSuchAlgorithmException

Encrypt the PrivateKeyInfo data structure (PKCS#5 and PKCS#8).

Parameters:

password - the password to use

encAlgorithm - the AlgorithmID of the encryption algorithm

Throws: NoSuchAlgorithmException

if there is no implementation for the specified algorithm

 public byte[] getEncoded()

Returns the encoded private key: The ASN.1 type is "SubjectPublicKeyInfo" and the coding is DER.

Returns:

the private key as a DER encoded ASN.1 datastructure

 public String getAlgorithm()

Returns the name of the algorithm: RSA.

Returns:

the name of the algorithm

 public String getFormat()

Returns the name of the encoding format: X.509.

Returns:

the name of the encoding format

 public void saveToFile(String fileName) throws IOException

Saves this private key into a file.

Parameters:

fileName - the name of the file

Throws: IOException

if an error occurs during saving the file

 public void setCodingFormat(int format)

Sets the format for saveToFile(), getEncoded() and toByteArray().

Parameters:

format - ASN1.PEM or ASN1.DER

 public int getCodingFormat()

Returns the coding format.

Parameters:

format - ASN1.PEM or ASN1.DER

 public PublicKey getPublicKey()

Returns the public parts of this private key.

Returns:

the public key part of this private key

 public BigInteger getExponent()

Returns the private exponent of this private key.

Returns:

the private exponent of the private key.

Overrides:

getExponent in class RSAKey

 public BigInteger getPublicExponent()

Returns the public exponent of this private key.

Returns:

the public exponent of the private key.

 public BigInteger getModulus()

Returns the modulus of this private key.

Returns:

the public modulus of the private key.

Overrides:

getModulus in class RSAKey

 public AlgorithmID getEncryptionAlgorithm()

Returns the encryption algorithm or null, if this RSAPrivateKey is not encrypted.

Returns:

the signature algorithm used to sign this certificate

 public String toString()

Returns a string that represents the contents of this private key.

Returns:

the string representation

Overrides:

toString in class Object

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