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* accompanied this code).
*
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package sun.security.pkcs11;
import java.security.*;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.*;
import java.util.Locale;
import javax.crypto.*;
import javax.crypto.spec.*;
import static sun.security.pkcs11.TemplateManager.*;
import sun.security.pkcs11.wrapper.*;
import static sun.security.pkcs11.wrapper.PKCS11Constants.*;
import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec;
import sun.security.util.KeyUtil;
/**
* RSA Cipher implementation class. We currently only support
* PKCS#1 v1.5 padding on top of CKM_RSA_PKCS.
*
* @author Andreas Sterbenz
* @since 1.5
*/
final class P11RSACipher extends CipherSpi {
// minimum length of PKCS#1 v1.5 padding
private final static int PKCS1_MIN_PADDING_LENGTH = 11;
// constant byte[] of length 0
private final static byte[] B0 = new byte[0];
// mode constant for public key encryption
private final static int MODE_ENCRYPT = 1;
// mode constant for private key decryption
private final static int MODE_DECRYPT = 2;
// mode constant for private key encryption (signing)
private final static int MODE_SIGN = 3;
// mode constant for public key decryption (verifying)
private final static int MODE_VERIFY = 4;
// padding type constant for NoPadding
private final static int PAD_NONE = 1;
// padding type constant for PKCS1Padding
private final static int PAD_PKCS1 = 2;
// token instance
private final Token token;
// algorithm name (always "RSA")
private final String algorithm;
// mechanism id
private final long mechanism;
// associated session, if any
private Session session;
// mode, one of MODE_* above
private int mode;
// padding, one of PAD_* above
private int padType;
private byte[] buffer;
private int bufOfs;
// key, if init() was called
private P11Key p11Key;
// flag indicating whether an operation is initialized
private boolean initialized;
// maximum input data size allowed
// for decryption, this is the length of the key
// for encryption, length of the key minus minimum padding length
private int maxInputSize;
// maximum output size. this is the length of the key
private int outputSize;
// cipher parameter for TLS RSA premaster secret
private AlgorithmParameterSpec spec = null;
// the source of randomness
private SecureRandom random;
P11RSACipher(Token token, String algorithm, long mechanism)
throws PKCS11Exception {
super();
this.token = token;
this.algorithm = "RSA";
this.mechanism = mechanism;
}
// modes do not make sense for RSA, but allow ECB
// see JCE spec
protected void engineSetMode(String mode) throws NoSuchAlgorithmException {
if (mode.equalsIgnoreCase("ECB") == false) {
throw new NoSuchAlgorithmException("Unsupported mode " + mode);
}
}
protected void engineSetPadding(String padding)
throws NoSuchPaddingException {
String lowerPadding = padding.toLowerCase(Locale.ENGLISH);
if (lowerPadding.equals("pkcs1padding")) {
padType = PAD_PKCS1;
} else if (lowerPadding.equals("nopadding")) {
padType = PAD_NONE;
} else {
throw new NoSuchPaddingException("Unsupported padding " + padding);
}
}
// return 0 as block size, we are not a block cipher
// see JCE spec
protected int engineGetBlockSize() {
return 0;
}
// return the output size
// see JCE spec
protected int engineGetOutputSize(int inputLen) {
return outputSize;
}
// no IV, return null
// see JCE spec
protected byte[] engineGetIV() {
return null;
}
// no parameters, return null
// see JCE spec
protected AlgorithmParameters engineGetParameters() {
return null;
}
// see JCE spec
protected void engineInit(int opmode, Key key, SecureRandom random)
throws InvalidKeyException {
implInit(opmode, key);
}
// see JCE spec
protected void engineInit(int opmode, Key key,
AlgorithmParameterSpec params, SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException {
if (params != null) {
if (!(params instanceof TlsRsaPremasterSecretParameterSpec)) {
throw new InvalidAlgorithmParameterException(
"Parameters not supported");
}
spec = params;
this.random = random; // for TLS RSA premaster secret
}
implInit(opmode, key);
}
// see JCE spec
protected void engineInit(int opmode, Key key, AlgorithmParameters params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException {
if (params != null) {
throw new InvalidAlgorithmParameterException(
"Parameters not supported");
}
implInit(opmode, key);
}
private void implInit(int opmode, Key key) throws InvalidKeyException {
cancelOperation();
p11Key = P11KeyFactory.convertKey(token, key, algorithm);
boolean encrypt;
if (opmode == Cipher.ENCRYPT_MODE) {
encrypt = true;
} else if (opmode == Cipher.DECRYPT_MODE) {
encrypt = false;
} else if (opmode == Cipher.WRAP_MODE) {
if (p11Key.isPublic() == false) {
throw new InvalidKeyException
("Wrap has to be used with public keys");
}
// No further setup needed for C_Wrap(). We'll initialize later if
// we can't use C_Wrap().
return;
} else if (opmode == Cipher.UNWRAP_MODE) {
if (p11Key.isPrivate() == false) {
throw new InvalidKeyException
("Unwrap has to be used with private keys");
}
// No further setup needed for C_Unwrap(). We'll initialize later
// if we can't use C_Unwrap().
return;
} else {
throw new InvalidKeyException("Unsupported mode: " + opmode);
}
if (p11Key.isPublic()) {
mode = encrypt ? MODE_ENCRYPT : MODE_VERIFY;
} else if (p11Key.isPrivate()) {
mode = encrypt ? MODE_SIGN : MODE_DECRYPT;
} else {
throw new InvalidKeyException("Unknown key type: " + p11Key);
}
int n = (p11Key.length() + 7) >> 3;
outputSize = n;
buffer = new byte[n];
maxInputSize = ((padType == PAD_PKCS1 && encrypt) ?
(n - PKCS1_MIN_PADDING_LENGTH) : n);
try {
initialize();
} catch (PKCS11Exception e) {
throw new InvalidKeyException("init() failed", e);
}
}
private void cancelOperation() {
token.ensureValid();
if (initialized == false) {
return;
}
initialized = false;
if ((session == null) || (token.explicitCancel == false)) {
return;
}
if (session.hasObjects() == false) {
session = token.killSession(session);
return;
}
try {
PKCS11 p11 = token.p11;
int inLen = maxInputSize;
int outLen = buffer.length;
switch (mode) {
case MODE_ENCRYPT:
p11.C_Encrypt
(session.id(), buffer, 0, inLen, buffer, 0, outLen);
break;
case MODE_DECRYPT:
p11.C_Decrypt
(session.id(), buffer, 0, inLen, buffer, 0, outLen);
break;
case MODE_SIGN:
byte[] tmpBuffer = new byte[maxInputSize];
p11.C_Sign
(session.id(), tmpBuffer);
break;
case MODE_VERIFY:
p11.C_VerifyRecover
(session.id(), buffer, 0, inLen, buffer, 0, outLen);
break;
default:
throw new ProviderException("internal error");
}
} catch (PKCS11Exception e) {
// XXX ensure this always works, ignore error
}
}
private void ensureInitialized() throws PKCS11Exception {
token.ensureValid();
if (initialized == false) {
initialize();
}
}
private void initialize() throws PKCS11Exception {
if (session == null) {
session = token.getOpSession();
}
PKCS11 p11 = token.p11;
CK_MECHANISM ckMechanism = new CK_MECHANISM(mechanism);
switch (mode) {
case MODE_ENCRYPT:
p11.C_EncryptInit(session.id(), ckMechanism, p11Key.keyID);
break;
case MODE_DECRYPT:
p11.C_DecryptInit(session.id(), ckMechanism, p11Key.keyID);
break;
case MODE_SIGN:
p11.C_SignInit(session.id(), ckMechanism, p11Key.keyID);
break;
case MODE_VERIFY:
p11.C_VerifyRecoverInit(session.id(), ckMechanism, p11Key.keyID);
break;
default:
throw new AssertionError("internal error");
}
bufOfs = 0;
initialized = true;
}
private void implUpdate(byte[] in, int inOfs, int inLen) {
try {
ensureInitialized();
} catch (PKCS11Exception e) {
throw new ProviderException("update() failed", e);
}
if ((inLen == 0) || (in == null)) {
return;
}
if (bufOfs + inLen > maxInputSize) {
bufOfs = maxInputSize + 1;
return;
}
System.arraycopy(in, inOfs, buffer, bufOfs, inLen);
bufOfs += inLen;
}
private int implDoFinal(byte[] out, int outOfs, int outLen)
throws BadPaddingException, IllegalBlockSizeException {
if (bufOfs > maxInputSize) {
throw new IllegalBlockSizeException("Data must not be longer "
+ "than " + maxInputSize + " bytes");
}
try {
ensureInitialized();
PKCS11 p11 = token.p11;
int n;
switch (mode) {
case MODE_ENCRYPT:
n = p11.C_Encrypt
(session.id(), buffer, 0, bufOfs, out, outOfs, outLen);
break;
case MODE_DECRYPT:
n = p11.C_Decrypt
(session.id(), buffer, 0, bufOfs, out, outOfs, outLen);
break;
case MODE_SIGN:
byte[] tmpBuffer = new byte[bufOfs];
System.arraycopy(buffer, 0, tmpBuffer, 0, bufOfs);
tmpBuffer = p11.C_Sign(session.id(), tmpBuffer);
if (tmpBuffer.length > outLen) {
throw new BadPaddingException("Output buffer too small");
}
System.arraycopy(tmpBuffer, 0, out, outOfs, tmpBuffer.length);
n = tmpBuffer.length;
break;
case MODE_VERIFY:
n = p11.C_VerifyRecover
(session.id(), buffer, 0, bufOfs, out, outOfs, outLen);
break;
default:
throw new ProviderException("internal error");
}
return n;
} catch (PKCS11Exception e) {
throw (BadPaddingException)new BadPaddingException
("doFinal() failed").initCause(e);
} finally {
initialized = false;
session = token.releaseSession(session);
}
}
// see JCE spec
protected byte[] engineUpdate(byte[] in, int inOfs, int inLen) {
implUpdate(in, inOfs, inLen);
return B0;
}
// see JCE spec
protected int engineUpdate(byte[] in, int inOfs, int inLen,
byte[] out, int outOfs) throws ShortBufferException {
implUpdate(in, inOfs, inLen);
return 0;
}
// see JCE spec
protected byte[] engineDoFinal(byte[] in, int inOfs, int inLen)
throws IllegalBlockSizeException, BadPaddingException {
implUpdate(in, inOfs, inLen);
int n = implDoFinal(buffer, 0, buffer.length);
byte[] out = new byte[n];
System.arraycopy(buffer, 0, out, 0, n);
return out;
}
// see JCE spec
protected int engineDoFinal(byte[] in, int inOfs, int inLen,
byte[] out, int outOfs) throws ShortBufferException,
IllegalBlockSizeException, BadPaddingException {
implUpdate(in, inOfs, inLen);
return implDoFinal(out, outOfs, out.length - outOfs);
}
private byte[] doFinal() throws BadPaddingException,
IllegalBlockSizeException {
byte[] t = new byte[2048];
int n = implDoFinal(t, 0, t.length);
byte[] out = new byte[n];
System.arraycopy(t, 0, out, 0, n);
return out;
}
// see JCE spec
protected byte[] engineWrap(Key key) throws InvalidKeyException,
IllegalBlockSizeException {
String keyAlg = key.getAlgorithm();
P11Key sKey = null;
try {
// The conversion may fail, e.g. trying to wrap an AES key on
// a token that does not support AES, or when the key size is
// not within the range supported by the token.
sKey = P11SecretKeyFactory.convertKey(token, key, keyAlg);
} catch (InvalidKeyException ike) {
byte[] toBeWrappedKey = key.getEncoded();
if (toBeWrappedKey == null) {
throw new InvalidKeyException
("wrap() failed, no encoding available", ike);
}
// Directly encrypt the key encoding when key conversion failed
implInit(Cipher.ENCRYPT_MODE, p11Key);
implUpdate(toBeWrappedKey, 0, toBeWrappedKey.length);
try {
return doFinal();
} catch (BadPaddingException bpe) {
// should not occur
throw new InvalidKeyException("wrap() failed", bpe);
} finally {
// Restore original mode
implInit(Cipher.WRAP_MODE, p11Key);
}
}
Session s = null;
try {
s = token.getOpSession();
return token.p11.C_WrapKey(s.id(), new CK_MECHANISM(mechanism),
p11Key.keyID, sKey.keyID);
} catch (PKCS11Exception e) {
throw new InvalidKeyException("wrap() failed", e);
} finally {
token.releaseSession(s);
}
}
// see JCE spec
protected Key engineUnwrap(byte[] wrappedKey, String algorithm,
int type) throws InvalidKeyException, NoSuchAlgorithmException {
boolean isTlsRsaPremasterSecret =
algorithm.equals("TlsRsaPremasterSecret");
Exception failover = null;
SecureRandom secureRandom = random;
if (secureRandom == null && isTlsRsaPremasterSecret) {
secureRandom = new SecureRandom();
}
// Should C_Unwrap be preferred for non-TLS RSA premaster secret?
if (token.supportsRawSecretKeyImport()) {
// XXX implement unwrap using C_Unwrap() for all keys
implInit(Cipher.DECRYPT_MODE, p11Key);
if (wrappedKey.length > maxInputSize) {
throw new InvalidKeyException("Key is too long for unwrapping");
}
byte[] encoded = null;
implUpdate(wrappedKey, 0, wrappedKey.length);
try {
encoded = doFinal();
} catch (BadPaddingException e) {
if (isTlsRsaPremasterSecret) {
failover = e;
} else {
throw new InvalidKeyException("Unwrapping failed", e);
}
} catch (IllegalBlockSizeException e) {
// should not occur, handled with length check above
throw new InvalidKeyException("Unwrapping failed", e);
}
if (isTlsRsaPremasterSecret) {
if (!(spec instanceof TlsRsaPremasterSecretParameterSpec)) {
throw new IllegalStateException(
"No TlsRsaPremasterSecretParameterSpec specified");
}
// polish the TLS premaster secret
TlsRsaPremasterSecretParameterSpec psps =
(TlsRsaPremasterSecretParameterSpec)spec;
encoded = KeyUtil.checkTlsPreMasterSecretKey(
psps.getClientVersion(), psps.getServerVersion(),
secureRandom, encoded, (failover != null));
}
return ConstructKeys.constructKey(encoded, algorithm, type);
} else {
Session s = null;
SecretKey secretKey = null;
try {
try {
s = token.getObjSession();
long keyType = CKK_GENERIC_SECRET;
CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {
new CK_ATTRIBUTE(CKA_CLASS, CKO_SECRET_KEY),
new CK_ATTRIBUTE(CKA_KEY_TYPE, keyType),
};
attributes = token.getAttributes(
O_IMPORT, CKO_SECRET_KEY, keyType, attributes);
long keyID = token.p11.C_UnwrapKey(s.id(),
new CK_MECHANISM(mechanism), p11Key.keyID,
wrappedKey, attributes);
secretKey = P11Key.secretKey(s, keyID,
algorithm, 48 << 3, attributes);
} catch (PKCS11Exception e) {
if (isTlsRsaPremasterSecret) {
failover = e;
} else {
throw new InvalidKeyException("unwrap() failed", e);
}
}
if (isTlsRsaPremasterSecret) {
byte[] replacer = new byte[48];
if (failover == null) {
// Does smart compiler dispose this operation?
secureRandom.nextBytes(replacer);
}
TlsRsaPremasterSecretParameterSpec psps =
(TlsRsaPremasterSecretParameterSpec)spec;
// Please use the tricky failover and replacer byte array
// as the parameters so that smart compiler won't dispose
// the unused variable .
secretKey = polishPreMasterSecretKey(token, s,
failover, replacer, secretKey,
psps.getClientVersion(), psps.getServerVersion());
}
return secretKey;
} finally {
token.releaseSession(s);
}
}
}
// see JCE spec
protected int engineGetKeySize(Key key) throws InvalidKeyException {
int n = P11KeyFactory.convertKey(token, key, algorithm).length();
return n;
}
private static SecretKey polishPreMasterSecretKey(
Token token, Session session,
Exception failover, byte[] replacer, SecretKey secretKey,
int clientVersion, int serverVersion) {
if (failover != null) {
CK_VERSION version = new CK_VERSION(
(clientVersion >>> 8) & 0xFF, clientVersion & 0xFF);
try {
CK_ATTRIBUTE[] attributes = token.getAttributes(
O_GENERATE, CKO_SECRET_KEY,
CKK_GENERIC_SECRET, new CK_ATTRIBUTE[0]);
long keyID = token.p11.C_GenerateKey(session.id(),
// new CK_MECHANISM(CKM_TLS_PRE_MASTER_KEY_GEN, version),
new CK_MECHANISM(CKM_SSL3_PRE_MASTER_KEY_GEN, version),
attributes);
return P11Key.secretKey(session,
keyID, "TlsRsaPremasterSecret", 48 << 3, attributes);
} catch (PKCS11Exception e) {
throw new ProviderException(
"Could not generate premaster secret", e);
}
}
return secretKey;
}
}
final class ConstructKeys {
/**
* Construct a public key from its encoding.
*
* @param encodedKey the encoding of a public key.
*
* @param encodedKeyAlgorithm the algorithm the encodedKey is for.
*
* @return a public key constructed from the encodedKey.
*/
private static final PublicKey constructPublicKey(byte[] encodedKey,
String encodedKeyAlgorithm)
throws InvalidKeyException, NoSuchAlgorithmException {
try {
KeyFactory keyFactory =
KeyFactory.getInstance(encodedKeyAlgorithm);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(encodedKey);
return keyFactory.generatePublic(keySpec);
} catch (NoSuchAlgorithmException nsae) {
throw new NoSuchAlgorithmException("No installed providers " +
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