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Class iaik.security.rsa.RSAPublicKey

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

public class RSAPublicKey

extends RSAKey

implements RSAPublicKey, Serializable

See Also:

Key, PublicKey, PrivateKey, RSAPrivateKey

RSAPublicKey(ASN1Object)

Creates a new public key from an ASN1Object.

RSAPublicKey(BigInteger, BigInteger)

Creates a new public key with given values for the modulus and the public exponent.

RSAPublicKey(byte[])

Creates a new public key from an array.

RSAPublicKey(String)

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

crypt(BigInteger)

Uses the public key to encrypt or decrypt a message.

getAlgorithm()

Returns the name of the algorithm: RSA.

getEncoded()

Returns the public key encoded as SubjectPublicKeyInfo.

getExponent()

Returns the publicexponent of the public key.

getFingerprint()

Returns the fingerprint of this public key.

getFormat()

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

getModulus()

Returns the modulus of the public key.

getSaveFormat()

Returns the file format (ASN1.DER, ASN1.PEM) of the public key.

saveToFile(String)

Saves this public key into a file.

setSaveFormat(int)

Sets the file format when saving the public key.

toASN1Object()

Returns the public key encoded as SubjectPublicKeyInfo.

toString()

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

 public RSAPublicKey(BigInteger publicExponent,
                     BigInteger modulus)

Creates a new public key with given values for the modulus and the public exponent.

Parameters:

publicExponent - the public exponent of the key

modulus - the modulus of the key

 public RSAPublicKey(byte pk[]) throws InvalidKeyException

Creates a new public key from an array. The coding format of the array can be DER or PEM and the ASN.1 type can be:

• SubjectPublicKey
• SubjectPublicKeyInfo

Parameters:

pk - the encoded public key

Throws: InvalidKeyException

if something is wrong with the key encoding

 public RSAPublicKey(ASN1Object obj) throws InvalidKeyException

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

• SubjectPublicKey
• SubjectPublicKeyInfo

Parameters:

obj - ASN1Object of the following type:

Throws: InvalidKeyException

if something is wrong with the key encoding

 public RSAPublicKey(String fileName) throws IOException, InvalidKeyException

Creates a new public 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 byte[] getEncoded()

Returns the public key encoded as SubjectPublicKeyInfo.

Returns:

the public key as a DER encoded ASN.1 datastructure

 public ASN1Object toASN1Object()

Returns the public key encoded as SubjectPublicKeyInfo.

Returns:

the public key as an ASN1Object

 public BigInteger crypt(BigInteger message)

Uses the public key to encrypt or decrypt a message. Simply performs a modula exponentiation.

Parameters:

message - the message to en/decrypt as BigInteger

Returns:

the encrypted or decrypted message

Overrides:

crypt in class RSAKey

 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 public key into a file.

Parameters:

fileName - the name of the file

Throws: IOException

if an error occurs during saving the file

 public void setSaveFormat(int format)

Sets the file format when saving the public key.

Parameters:

format - ASN1.PEM or ASN1.DER

 public int getSaveFormat()

Returns the file format (ASN1.DER, ASN1.PEM) of the public key.

Returns:

the safe format

 public BigInteger getExponent()

Returns the publicexponent of the public key.

Returns:

the public exponent

Overrides:

getExponent in class RSAKey

 public BigInteger getModulus()

Returns the modulus of the public key.

Returns:

the modulus

Overrides:

getModulus in class RSAKey

 public byte[] getFingerprint()

Returns the fingerprint of this public key. This is a MD5 hash of the DER encoded SubjectPublicKey.

Returns:

the fingerprint of the public key

 public String toString()

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

Returns:

the string representation

Overrides:

toString in class Object

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