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Diffstat (limited to 'libraries/spongycastle/jce/src/main/java/javax/crypto/Mac.java')
| -rw-r--r-- | libraries/spongycastle/jce/src/main/java/javax/crypto/Mac.java | 443 |
1 files changed, 0 insertions, 443 deletions
diff --git a/libraries/spongycastle/jce/src/main/java/javax/crypto/Mac.java b/libraries/spongycastle/jce/src/main/java/javax/crypto/Mac.java deleted file mode 100644 index 9f6174d82..000000000 --- a/libraries/spongycastle/jce/src/main/java/javax/crypto/Mac.java +++ /dev/null @@ -1,443 +0,0 @@ -package javax.crypto; - -import java.security.Provider; -import java.security.Key; -import java.security.InvalidKeyException; -import java.security.NoSuchAlgorithmException; -import java.security.NoSuchProviderException; -import java.security.spec.AlgorithmParameterSpec; -import java.security.InvalidAlgorithmParameterException; - -/** - * This class provides the functionality of a "Message Authentication Code" - * (MAC) algorithm. - * <p> - * A MAC provides a way to check the integrity of information transmitted over - * or stored in an unreliable medium, based on a secret key. Typically, message - * authentication codes are used between two parties that share a secret - * key in order to validate information transmitted between these - * parties. - * <p> - * A MAC mechanism that is based on cryptographic hash functions is - * referred to as HMAC. HMAC can be used with any cryptographic hash function, - * e.g., MD5 or SHA-1, in combination with a secret shared key. HMAC is - * specified in RFC 2104. - */ -public class Mac - implements Cloneable -{ - MacSpi macSpi; - Provider provider; - String algorithm; - - private boolean initialised = false; - - /** - * Creates a MAC object. - * - * @param macSpi the delegate - * @param provider the provider - * @param algorithm the algorithm - */ - protected Mac( - MacSpi macSpi, - Provider provider, - String algorithm) - { - this.macSpi = macSpi; - this.provider = provider; - this.algorithm = algorithm; - } - - /** - * Returns the algorithm name of this <code>Mac</code> object. - * <p> - * This is the same name that was specified in one of the - * <code>getInstance</code> calls that created this <code>Mac</code> object. - * - * @return the algorithm name of this <code>Mac</code> object. - */ - public final String getAlgorithm() - { - return algorithm; - } - - /** - * Generates an <code>Mac</code> object that implements the - * specified MAC algorithm. - * If the default provider package provides an implementation of the - * requested MAC algorithm, an instance of - * <code>Mac</code> containing that implementation is returned. - * If the algorithm is not available in the default provider package, - * other provider packages are searched. - * - * @param algorithm the standard name of the requested MAC algorithm. - * See Appendix A in the Java Cryptography Extension API Specification & Reference - * for information about standard algorithm names. - * @return the new <code>Mac</code> object. - * @exception NoSuchAlgorithmException if the specified algorithm is not - * available in the default provider package or any of the other provider - * packages that were searched. - */ - public static final Mac getInstance( - String algorithm) - throws NoSuchAlgorithmException - { - try - { - JCEUtil.Implementation imp = JCEUtil.getImplementation("Mac", algorithm, (String) null); - - if (imp == null) - { - throw new NoSuchAlgorithmException(algorithm + " not found"); - } - - Mac mac = new Mac((MacSpi)imp.getEngine(), imp.getProvider(), algorithm); - - return mac; - } - catch (NoSuchProviderException e) - { - throw new NoSuchAlgorithmException(algorithm + " not found"); - } - } - - /** - * Generates an <code>Mac</code> object for the specified MAC - * algorithm from the specified provider. - * - * @param algorithm the standard name of the requested MAC algorithm. - * See Appendix A in the Java Cryptography Extension API Specification & Reference - * for information about standard algorithm names. - * @param provider the name of the provider. - * @return the new <code>Mac</code> object. - * @exception NoSuchAlgorithmException if the specified algorithm is not available from the - * specified provider. - * @exception NoSuchProviderException if the specified provider has not been configured. - */ - public static final Mac getInstance( - String algorithm, - String provider) - throws NoSuchAlgorithmException, NoSuchProviderException - { - if (provider == null) - { - throw new IllegalArgumentException("No provider specified to Mac.getInstance()"); - } - - JCEUtil.Implementation imp = JCEUtil.getImplementation("Mac", algorithm, provider); - - if (imp == null) - { - throw new NoSuchAlgorithmException(algorithm + " not found"); - } - - Mac mac = new Mac((MacSpi)imp.getEngine(), imp.getProvider(), algorithm); - - return mac; - } - - /** - * Generates an <code>Mac</code> object for the specified MAC - * algorithm from the specified provider. - * - * @param algorithm the standard name of the requested MAC algorithm. - * See Appendix A in the Java Cryptography Extension API Specification & Reference - * for information about standard algorithm names. - * @param provider the provider. - * @return the new <code>Mac</code> object. - * @exception NoSuchAlgorithmException if the specified algorithm is not available from the - * specified provider. - */ - public static final Mac getInstance( - String algorithm, - Provider provider) - throws NoSuchAlgorithmException - { - if (provider == null) - { - throw new IllegalArgumentException("No provider specified to Mac.getInstance()"); - } - - JCEUtil.Implementation imp = JCEUtil.getImplementation("Mac", algorithm, provider); - - if (imp == null) - { - throw new NoSuchAlgorithmException(algorithm + " not found"); - } - - Mac mac = new Mac((MacSpi)imp.getEngine(), imp.getProvider(), algorithm); - - return mac; - } - - /** - * Returns the provider of this <code>Mac</code> object. - * - * @return the provider of this <code>Mac</code> object. - */ - public final Provider getProvider() - { - return provider; - } - - /** - * Returns the length of the MAC in bytes. - * - * @return the MAC length in bytes. - */ - public final int getMacLength() - { - return macSpi.engineGetMacLength(); - } - - /** - * Initializes this <code>Mac</code> object with the given key. - * - * @param key the key. - * @exception InvalidKeyException if the given key is inappropriate for initializing this MAC. - */ - public final void init( - Key key) - throws InvalidKeyException - { - try - { - macSpi.engineInit(key, null); - initialised = true; - } - catch (InvalidAlgorithmParameterException e) - { - throw new IllegalArgumentException("underlying mac waon't work without an AlgorithmParameterSpec"); - } - } - - /** - * Initializes this <code>Mac</code> object with the given key and - * algorithm parameters. - * - * @param key the key. - * @param params the algorithm parameters. - * @exception InvalidKeyException if the given key is inappropriate for initializing this MAC. - * @exception InvalidAlgorithmParameterException if the given algorithm parameters are inappropriate - * for this MAC. - */ - public final void init( - Key key, - AlgorithmParameterSpec params) - throws InvalidKeyException, InvalidAlgorithmParameterException - { - macSpi.engineInit(key, params); - initialised = true; - } - - /** - * Processes the given byte. - * - * @param input the input byte to be processed. - * @exception IllegalStateException if this <code>Mac</code> has not been initialized. - */ - public final void update( - byte input) - throws IllegalStateException - { - if (!initialised) - { - throw new IllegalStateException("MAC not initialised"); - } - - macSpi.engineUpdate(input); - } - - /** - * Processes the given array of bytes. - * - * @param input the array of bytes to be processed. - * @exception IllegalStateException if this <code>Mac</code> has not been initialized. - */ - public final void update( - byte[] input) - throws IllegalStateException - { - if (!initialised) - { - throw new IllegalStateException("MAC not initialised"); - } - - if (input == null) - { - return; - } - - macSpi.engineUpdate(input, 0, input.length); - } - - /** - * Processes the first <code>len</code> bytes in <code>input</code>, - * starting at <code>offset</code> inclusive. - * - * @param input the input buffer. - * @param offset the offset in <code>input</code> where the input starts. - * @param len the number of bytes to process. - * @exception IllegalStateException if this <code>Mac</code> has not been initialized. - */ - public final void update( - byte[] input, - int offset, - int len) - throws IllegalStateException - { - if (!initialised) - { - throw new IllegalStateException("MAC not initialised"); - } - - if (input == null) - { - throw new IllegalArgumentException("Null input passed"); - } - - if (len < 0 || offset < 0 || len > (input.length - offset)) - { - throw new IllegalArgumentException("Bad offset/len"); - } - - if (input.length == 0) - { - return; - } - - macSpi.engineUpdate(input, offset, len); - } - - /** - * Finishes the MAC operation. - * <p> - * A call to this method resets this <code>Mac</code> object to the - * state it was in when previously initialized via a call to <code>init(Key)</code> or - * <code>init(Key, AlgorithmParameterSpec)</code>. - * That is, the object is reset and available to generate another MAC from - * the same key, if desired, via new calls to <code>update</code> and - * <code>doFinal</code>. - * (In order to reuse this <code>Mac</code> object with a different key, - * it must be reinitialized via a call to <code>init(Key)</code> or - * <code>init(Key, AlgorithmParameterSpec)</code>. - * - * @return the MAC result. - * @exception IllegalStateException if this <code>Mac</code> has not been initialized. - */ - public final byte[] doFinal() - throws IllegalStateException - { - if (!initialised) - { - throw new IllegalStateException("MAC not initialised"); - } - - return macSpi.engineDoFinal(); - } - - /** - * Finishes the MAC operation. - * - * <p>A call to this method resets this <code>Mac</code> object to the - * state it was in when previously initialized via a call to - * <code>init(Key)</code> or - * <code>init(Key, AlgorithmParameterSpec)</code>. - * That is, the object is reset and available to generate another MAC from - * the same key, if desired, via new calls to <code>update</code> and - * <code>doFinal</code>. - * (In order to reuse this <code>Mac</code> object with a different key, - * it must be reinitialized via a call to <code>init(Key)</code> or - * <code>init(Key, AlgorithmParameterSpec)</code>. - * <p> - * The MAC result is stored in <code>output</code>, starting at - * <code>outOffset</code> inclusive. - * - * @param output the buffer where the MAC result is stored - * @param outOffset the offset in <code>output</code> where the MAC is stored - * @exception ShortBufferException if the given output buffer is too small to hold the result - * @exception IllegalStateException if this <code>Mac</code> has not been initialized. - */ - public final void doFinal( - byte[] output, - int outOffset) - throws ShortBufferException, IllegalStateException - { - if (!initialised) - { - throw new IllegalStateException("MAC not initialised"); - } - - if ((output.length - outOffset) < macSpi.engineGetMacLength()) - { - throw new ShortBufferException("buffer to short for MAC output"); - } - - byte[] mac = macSpi.engineDoFinal(); - - System.arraycopy(mac, 0, output, outOffset, mac.length); - } - - /** - * Processes the given array of bytes and finishes the MAC operation. - * <p> - * A call to this method resets this <code>Mac</code> object to the - * state it was in when previously initialized via a call to <code>init(Key)</code> or - * <code>init(Key, AlgorithmParameterSpec)</code>. That is, the object is reset and - * available to generate another MAC from the same key, if desired, via new calls to - * <code>update</code> and <code>doFinal</code>. - * (In order to reuse this <code>Mac</code> object with a different key, - * it must be reinitialized via a call to <code>init(Key)</code> or - * <code>init(Key, AlgorithmParameterSpec)</code>. - * - * @return the MAC result. - * @exception IllegalStateException if this <code>Mac</code> has not been initialized. - */ - public final byte[] doFinal( - byte[] input) - throws IllegalStateException - { - if (!initialised) - { - throw new IllegalStateException("MAC not initialised"); - } - - macSpi.engineUpdate(input, 0, input.length); - - return macSpi.engineDoFinal(); - } - - /** - * Resets this <code>Mac</code> object. - * <p> - * A call to this method resets this <code>Mac</code> object to the - * state it was in when previously initialized via a call to - * <code>init(Key)</code> or <code>init(Key, AlgorithmParameterSpec)</code>. - * That is, the object is reset and available to generate another MAC from - * the same key, if desired, via new calls to <code>update</code> and - * <code>doFinal</code>. - * (In order to reuse this <code>Mac</code> object with a different key, - * it must be reinitialized via a call to <code>init(Key)</code> or - * <code>init(Key, AlgorithmParameterSpec)</code>. - */ - public final void reset() - { - macSpi.engineReset(); - } - - /** - * Returns a clone if the provider implementation is cloneable. - * - * @return a clone if the provider implementation is cloneable. - * @exception CloneNotSupportedException if this is called on a delegate that does - * not support <code>Cloneable</code>. - */ - public final Object clone() - throws CloneNotSupportedException - { - Mac result = new Mac((MacSpi)macSpi.clone(), provider, algorithm); - result.initialised = initialised; - return result; - } -} |