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java.lang.Objectnet.rim.device.api.crypto.RSADecryptorEngine
public final class RSADecryptorEngine
Provides the RSA decryption functionality on a block by block basis. The block length is the size of the modulus, which must be a multiple of 8.
A description of the RSA algorithm can be found in PKCS #1 version 2.1. We support this definition of RSA.
For a code sample using the RSA decryptor engine, click here.
RSAEncryptorEngine,
RSAKeyPair| Constructor Summary | ||
|---|---|---|
|
RSADecryptorEngine(RSAPrivateKey key)
Creates an RSADecryptorEngine object given a private key that will be
used for decrypting the ciphertext. |
|
| Method Summary | ||
|---|---|---|
|
void |
decrypt(byte[] ciphertext,
int ciphertextOffset,
byte[] plaintext,
int plaintextOffset)
Decodes a block of the given ciphertext into a block of plaintext. |
|
String |
getAlgorithm()
Returns the name of the algorithm used, ie "RSA". |
|
int |
getBlockLength()
Returns the block length of the block cipher in bytes. |
| Methods inherited from class java.lang.Object |
|---|
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public RSADecryptorEngine(RSAPrivateKey key)
throws CryptoTokenException,
CryptoUnsupportedOperationException
RSADecryptorEngine object given a private key that will be
used for decrypting the ciphertext. The modulus must be a multiple of 8.
key - The private key that will be used to decrypt the data. The
private key is associated with the public key that was
used to encrypt the data.
CryptoTokenException - Thrown when an error occurs with a crypto
token or the crypto token is invalid.
CryptoUnsupportedOperationException - Thrown when a call is made to
an unsupported operation.| Method Detail |
|---|
public String getAlgorithm()
This method will always return the String "RSA".
getAlgorithm in interface BlockDecryptorEnginepublic int getBlockLength()
BlockDecryptorEngine
getBlockLength in interface BlockDecryptorEngine
public void decrypt(byte[] ciphertext,
int ciphertextOffset,
byte[] plaintext,
int plaintextOffset)
throws CryptoTokenException
BlockDecryptorEngine
decrypt in interface BlockDecryptorEngineciphertext - A byte array containing the input that is to be decrypted.ciphertextOffset - The starting offset, or initial byte position, of the data within the input array.plaintext - A byte array containing the output from the method.plaintextOffset - The starting offset, or initial byte position, of
the data within the output array.
CryptoTokenException - Thrown when an error occurs with the crypto
token or the crypto token is invalid.
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