Class RSACore

java.lang.Object

es.gob.jmulticard.jse.provider.rsacipher.RSACore

final class RSACore
extends Object

Operaciones con claves privadas RSA. No se soporta CRT (Chinese Remainder Theorem). Esta clase no realiza rellenos, estos deben hacerse externamente. Nota: Las claves RSA deben ser de al menos 512 bits.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static final class	RSACore.BlindingParameters	Set of blinding parameters for a given RSA key.
private static final class	RSACore.BlindingRandomPair	Parameters (u,v) for RSA Blinding.

Field Summary

Fields

Modifier and Type	Field	Description
private static final Map<BigInteger, RSACore.BlindingParameters>	BLINDING_CACHE
private static final boolean	ENABLE_BLINDING

Constructor Summary

Constructors

Modifier	Constructor	Description
private	RSACore()

Method Summary

Modifier and Type	Method	Description
(package private) static byte[]	convert(byte[] b, int ofs, int len)
private static byte[]	crypt(byte[] msg, BigInteger n, BigInteger exp)	Operación general de cifrado RSA (un modPow()).
private static RSACore.BlindingRandomPair	getBlindingRandomPair(BigInteger e, BigInteger d, BigInteger n)
(package private) static int	getByteLength(BigInteger b)	Return the number of bytes required to store the magnitude byte[] of this BigInteger.
(package private) static int	getByteLength(RSAKey key)	Devuelve el número de octetos necesarios para almacenar el módulo de una clave RSA.
private static BigInteger	parseMsg(byte[] msg, BigInteger n)	Parse the msg into a BigInteger and check against the modulus n.
private static byte[]	priCrypt(byte[] msg, BigInteger n, BigInteger exp)	RSA non-CRT private key operations.
(package private) static byte[]	rsa(byte[] msg, RSAPrivateKey key)	Ejecuta un cifrado RSA con una clave privada.
(package private) static byte[]	rsa(byte[] msg, RSAPublicKey key)	Ejecuta un cifrado RSA con una clave pública.
private static byte[]	toByteArray(BigInteger bi, int len)	Return the encoding of this BigInteger that is exactly len bytes long.

Methods inherited from class Object

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

Field Details

ENABLE_BLINDING

private static final boolean ENABLE_BLINDING

See Also:

• Constant Field Values

BLINDING_CACHE

private static final Map<BigInteger, RSACore.BlindingParameters> BLINDING_CACHE

Constructor Details

RSACore

private RSACore()

Method Details

getByteLength

static int getByteLength(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

static int getByteLength(RSAKey key)

Devuelve el número de octetos necesarios para almacenar el módulo de una clave RSA.

Parameters:

key - Clave RSA.

Returns:

Número de octetos necesarios para almacenar el módulo de la clave proporcionada.

convert

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

rsa

static byte[] rsa(byte[] msg,
 RSAPublicKey key)
           throws BadPaddingException

Ejecuta un cifrado RSA con una clave pública.

Throws:

BadPaddingException

rsa

static byte[] rsa(byte[] msg,
 RSAPrivateKey key)
           throws BadPaddingException,
CryptoCardException,
PinException,
LostChannelException

Ejecuta un cifrado RSA con una clave privada.

Throws:

LostChannelException - Si la clave es de un DNIe y se ha perdido el canal seguro.

PinException - Si la clave es de un DNIe y el PIN introducido es inválido.

CryptoCardException - Si la clave es de un DNIe y hay problemas con la tarjeta.

BadPaddingException

crypt

private static byte[] crypt(byte[] msg,
 BigInteger n,
 BigInteger exp)
                     throws BadPaddingException

Operación general de cifrado RSA (un modPow()).

Throws:

BadPaddingException

priCrypt

private static byte[] priCrypt(byte[] msg,
 BigInteger n,
 BigInteger exp)
                        throws BadPaddingException

RSA non-CRT private key operations.

Throws:

BadPaddingException

parseMsg

private static BigInteger parseMsg(byte[] msg,
 BigInteger n)
                            throws BadPaddingException

Parse the msg into a BigInteger and check against the modulus n.

Throws:

BadPaddingException

toByteArray

private static byte[] toByteArray(BigInteger bi,
 int len)

Return the encoding of this BigInteger that is exactly len bytes long. Prefix/strip off leading 0x00 bytes if necessary. Precondition: bi must fit into len bytes.

getBlindingRandomPair

private static RSACore.BlindingRandomPair getBlindingRandomPair(BigInteger e,
 BigInteger d,
 BigInteger n)