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Class iaik.security.rsa.RSAKey

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

public abstract class RSAKey

extends Object

implements RSAKey

RSAKey()

crypt(BigInteger)

Uses the key to encrypt or decrypt a message.

crypt(byte[])

Uses the key from the subclass to encrypt or decrypt a message.

decrypt(int, byte[])

This method decrypts a RSA encrypted block and parses the result according to the in PKCS#1 defined encryption block.

encrypt(int, byte[])

This method creates a PKCS#1 defined encryption block and encrypts it with the key from the subclass.

getExponent()

Returns the exponent.

getModulus()

Returns the modulus.

 public RSAKey()

 public abstract BigInteger crypt(BigInteger message)

Uses the 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

 public byte[] crypt(byte message[])

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

Parameters:

message - the message to en/decrypt

Returns:

the encrypted or decrypted message

 public byte[] decrypt(int blockType,
                       byte encrypted[]) throws SignatureException

This method decrypts a RSA encrypted block and parses the result according to the in PKCS#1 defined encryption block. Encryption block format: EB = BT|PS|00|D

• BT: block type (0, 1, 2)
• PS: padding string
• D: data

Parameters:

blockType - the block type this block should have

encrypted - the data to be decrypted and parsed

Returns:

the data inside this block

Throws: SignatureException

if there is an error while parsing the block

 public byte[] encrypt(int blockType,
                       byte data[]) throws SignatureException

This method creates a PKCS#1 defined encryption block and encrypts it with the key from the subclass. Encryption block format: EB = 00|BT|PS|00|D

• BT: block type (0, 1, 2)
• PS: padding string
• D: data

Parameters:

blockType - the block type that should be created

data - the data to encrypt

Returns:

the created encryption block

Throws: SignatureException

if the block could not be created

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