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java.lang.Object | +--gnu.crypto.sig.rsa.RSA
Utility methods related to the RSA algorithm.
References:
| Method Summary | |
|---|---|
static java.math.BigInteger |
decrypt(java.security.PrivateKey K,
java.math.BigInteger c)
An implementation of the RSADP algorithm. |
static java.math.BigInteger |
encrypt(java.security.PublicKey K,
java.math.BigInteger m)
An implementation of the RSAEP algorithm. |
static byte[] |
I2OSP(java.math.BigInteger s,
int k)
Converts a multi-precision integer (MPI) s into an
octet sequence of length k. |
static java.math.BigInteger |
sign(java.security.PrivateKey K,
java.math.BigInteger m)
An implementation of the RSASP method: Assuming that the designated RSA private key is a valid one, this method computes a signature representative for a designated message representative signed by the holder of the designated RSA private key. |
static java.math.BigInteger |
verify(java.security.PublicKey K,
java.math.BigInteger s)
An implementation of the RSAVP method: Assuming that the designated RSA public key is a valid one, this method computes a message representative for the designated signature representative generated by an RSA private key, for a message intended for the holder of the designated RSA public key. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Method Detail |
public static final java.math.BigInteger sign(java.security.PrivateKey K,
java.math.BigInteger m)
An implementation of the RSASP method: Assuming that the designated RSA private key is a valid one, this method computes a signature representative for a designated message representative signed by the holder of the designated RSA private key.
K - the RSA private key.m - the message representative: an integer between
0 and n - 1, where n is the RSA
modulus.
0 and n - 1, where n is the RSA
modulus.
java.lang.ClassCastException - if K is not an RSA one.
java.lang.IllegalArgumentException - if m (the message
representative) is out of range.
public static final java.math.BigInteger verify(java.security.PublicKey K,
java.math.BigInteger s)
An implementation of the RSAVP method: Assuming that the designated RSA public key is a valid one, this method computes a message representative for the designated signature representative generated by an RSA private key, for a message intended for the holder of the designated RSA public key.
K - the RSA public key.s - the signature representative, an integer between
0 and n - 1, where n is the RSA
modulus.
0
and n - 1, where n is the RSA modulus.
java.lang.ClassCastException - if K is not an RSA one.
java.lang.IllegalArgumentException - if s (the signature
representative) is out of range.
public static final java.math.BigInteger encrypt(java.security.PublicKey K,
java.math.BigInteger m)
An implementation of the RSAEP algorithm.
K - the recipient's RSA public key.m - the message representative as an MPI.
0 and
n - 1 (n being the public shared modulus)-- that
will eventually be padded with an appropriate framing/padding scheme.
java.lang.ClassCastException - if K is not an RSA one.
java.lang.IllegalArgumentException - if m, the message
representative is not between 0 and n - 1
(n being the public shared modulus).
public static final java.math.BigInteger decrypt(java.security.PrivateKey K,
java.math.BigInteger c)
An implementation of the RSADP algorithm.
K - the recipient's RSA private key.c - the ciphertext representative as an MPI.
0 and
n - 1 (n being the shared public modulus).
java.lang.ClassCastException - if K is not an RSA one.
java.lang.IllegalArgumentException - if c, the ciphertext
representative is not between 0 and n - 1
(n being the shared public modulus).
public static final byte[] I2OSP(java.math.BigInteger s,
int k)
Converts a multi-precision integer (MPI) s into an
octet sequence of length k.
s - the multi-precision integer to convert.k - the length of the output.
java.lang.IllegalArgumentException - if the length in octets of meaningful
bytes of s is greater than k.
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