com.ibm.crypto.fips.provider

Class RSACore

java.lang.Object

com.ibm.crypto.fips.provider.RSACore

public final class RSACore
extends java.lang.Object

Core of the RSA implementation. Has code to perform public and private key RSA operations (with and without CRT for private key ops). Private CRT ops also support blinding to twart timing attacks. The code in this class only does the core RSA operation. Padding and unpadding must be done externally. Note: RSA keys should be at least 512 bits long

Since:

1.5

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	convert(byte[] b, int ofs, int len)
static int	getByteLength(java.math.BigInteger b) Return the number of bytes required to store the magnitude byte[] of this BigInteger.
static int	getByteLength(java.security.interfaces.RSAKey key) Return the number of bytes required to store the modulus of this RSA key.
static byte[]	rsa(byte[] msg, java.security.interfaces.RSAPrivateKey key) Deprecated.
static byte[]	rsa(byte[] msg, java.security.interfaces.RSAPrivateKey key, boolean verify) Perform an RSA private key operation.
static byte[]	rsa(byte[] msg, java.security.interfaces.RSAPublicKey key) Perform an RSA public key operation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getByteLength

public static int getByteLength(java.math.BigInteger b)

Return the number of bytes required to store the magnitude byte[] of this BigInteger. Do not count a 0x00 byte toByteArray() would prefix for 2's complement form.

getByteLength

public static int getByteLength(java.security.interfaces.RSAKey key)

Return the number of bytes required to store the modulus of this RSA key.

convert

public static byte[] convert(byte[] b,
             int ofs,
             int len)

rsa

public static byte[] rsa(byte[] msg,
         java.security.interfaces.RSAPublicKey key)
                  throws javax.crypto.BadPaddingException

Perform an RSA public key operation.

Throws:

javax.crypto.BadPaddingException

rsa

@Deprecated
public static byte[] rsa(byte[] msg,
                    java.security.interfaces.RSAPrivateKey key)
                  throws javax.crypto.BadPaddingException

Deprecated.

Perform an RSA private key operation. Uses CRT if the key is a CRT key with additional verification check after the signature is computed.

Throws:

javax.crypto.BadPaddingException

rsa

public static byte[] rsa(byte[] msg,
         java.security.interfaces.RSAPrivateKey key,
         boolean verify)
                  throws javax.crypto.BadPaddingException

Perform an RSA private key operation. Uses CRT if the key is a CRT key. Set 'verify' to true if this function is used for generating a signature.

Throws:

javax.crypto.BadPaddingException