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java.lang.Objectgnu.crypto.sig.rsa.RSA
public class RSA
Utility methods related to the RSA algorithm.
References:
Method Summary | |
---|---|
static BigInteger |
decrypt(PrivateKey K,
BigInteger c)
An implementation of the RSADP algorithm. |
static BigInteger |
encrypt(PublicKey K,
BigInteger m)
An implementation of the RSAEP algorithm. |
static byte[] |
I2OSP(BigInteger s,
int k)
Converts a multi-precision integer (MPI) s into an
octet sequence of length k . |
static BigInteger |
sign(PrivateKey K,
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 BigInteger |
verify(PublicKey K,
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 |
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public static final BigInteger sign(PrivateKey K, 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.
ClassCastException
- if K
is not an RSA one.
IllegalArgumentException
- if m
(the message
representative) is out of range.public static final BigInteger verify(PublicKey K, 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.
ClassCastException
- if K
is not an RSA one.
IllegalArgumentException
- if s
(the signature
representative) is out of range.public static final BigInteger encrypt(PublicKey K, 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.
ClassCastException
- if K
is not an RSA one.
IllegalArgumentException
- if m
, the message
representative is not between 0
and n - 1
(n
being the public shared modulus).public static final BigInteger decrypt(PrivateKey K, 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).
ClassCastException
- if K
is not an RSA one.
IllegalArgumentException
- if c
, the ciphertext
representative is not between 0
and n - 1
(n
being the shared public modulus).public static final byte[] I2OSP(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.
IllegalArgumentException
- if the length in octets of meaningful
bytes of s
is greater than k
.
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