diff options
Diffstat (limited to 'libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DESKeySpec.java')
-rw-r--r-- | libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DESKeySpec.java | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DESKeySpec.java b/libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DESKeySpec.java deleted file mode 100644 index 8509a5464..000000000 --- a/libraries/spongycastle/jce/src/main/java/javax/crypto/spec/DESKeySpec.java +++ /dev/null @@ -1,194 +0,0 @@ -package javax.crypto.spec; - -import java.security.InvalidKeyException; -import java.security.spec.KeySpec; - -/** - * This class specifies a DES key. - */ -public class DESKeySpec - implements KeySpec -{ - public static final int DES_KEY_LEN = 8; - - private byte[] keyBytes = new byte[DES_KEY_LEN]; - - /** - * Uses the first 8 bytes in <code>key</code> as the key material for the DES key. - * <p> - * The bytes that constitute the DES key are those between - * <code>key[0]</code> and <code>key[7]</code> inclusive. - * - * @param key - the buffer with the DES key material. - * @exception InvalidKeyException - if the given key material is shorter than 8 bytes. - */ - public DESKeySpec( - byte[] key) - throws InvalidKeyException - { - if (key.length < DES_KEY_LEN) - { - throw new InvalidKeyException("DES key material too short in construction"); - } - - System.arraycopy(key, 0, keyBytes, 0, keyBytes.length); - } - - /** - * Uses the first 8 bytes in <code>key</code>, beginning at - * <code>offset</code> inclusive, as the key material for the DES key. - * <p> - * The bytes that constitute the DES key are those between - * <code>key[offset]</code> and <code>key[offset+7]</code> inclusive. - * - * @param key the buffer with the DES key material. - * @param offset the offset in <code>key</code>, where the DES key material starts. - * @exception InvalidKeyException if the given key material, starting at - * <code>offset</code> inclusive, is shorter than 8 bytes. - */ - public DESKeySpec( - byte[] key, - int offset) - throws InvalidKeyException - { - if ((key.length - offset) < DES_KEY_LEN) - { - throw new InvalidKeyException("DES key material too short in construction"); - } - - System.arraycopy(key, offset, keyBytes, 0, keyBytes.length); - } - - /** - * Returns the DES key material. - * - * @return the DES key material. - */ - public byte[] getKey() - { - byte[] tmp = new byte[DES_KEY_LEN]; - - System.arraycopy(keyBytes, 0, tmp, 0, tmp.length); - - return tmp; - } - - /** - * Checks if the given DES key material, starting at <code>offset</code> - * inclusive, is parity-adjusted. - * - * @param key the buffer with the DES key material. - * @param offset the offset in <code>key</code>, where the DES key material starts. - * @returns true if the given DES key material is parity-adjusted, false otherwise. - * @exception InvalidKeyException if the given key material, starting at <code>offset</code> - * inclusive, is shorter than 8 bytes. - */ - public static boolean isParityAdjusted( - byte[] key, - int offset) - throws InvalidKeyException - { - if ((key.length - offset) < DES_KEY_LEN) - { - throw new InvalidKeyException("key material too short in DESKeySpec.isParityAdjusted"); - } - - for (int i = 0; i < DES_KEY_LEN; i++) - { - byte keyByte = key[i + offset]; - int count = 0; - - keyByte = (byte)((keyByte & 0xff) >> 1); - - while (keyByte != 0) - { - /* - * we increment for every "on" bit - */ - if ((keyByte & 0x01) != 0) - { - count++; - } - - keyByte = (byte)((keyByte & 0xff) >> 1); - } - - if ((count & 1) == 1) - { - if ((key[i + offset] & 1) == 1) - { - return false; - } - } - else if ((key[i + offset] & 1) != 1) - { - return false; - } - } - - return true; - } - - /* - * Table of weak and semi-weak keys taken from Schneier pp281 - */ - static private final int N_DES_WEAK_KEYS = 16; - - static private byte[] DES_weak_keys = - { - /* weak keys */ - (byte)0x01,(byte)0x01,(byte)0x01,(byte)0x01, (byte)0x01,(byte)0x01,(byte)0x01,(byte)0x01, - (byte)0x1f,(byte)0x1f,(byte)0x1f,(byte)0x1f, (byte)0x0e,(byte)0x0e,(byte)0x0e,(byte)0x0e, - (byte)0xe0,(byte)0xe0,(byte)0xe0,(byte)0xe0, (byte)0xf1,(byte)0xf1,(byte)0xf1,(byte)0xf1, - (byte)0xfe,(byte)0xfe,(byte)0xfe,(byte)0xfe, (byte)0xfe,(byte)0xfe,(byte)0xfe,(byte)0xfe, - - /* semi-weak keys */ - (byte)0x01,(byte)0xfe,(byte)0x01,(byte)0xfe, (byte)0x01,(byte)0xfe,(byte)0x01,(byte)0xfe, - (byte)0x1f,(byte)0xe0,(byte)0x1f,(byte)0xe0, (byte)0x0e,(byte)0xf1,(byte)0x0e,(byte)0xf1, - (byte)0x01,(byte)0xe0,(byte)0x01,(byte)0xe0, (byte)0x01,(byte)0xf1,(byte)0x01,(byte)0xf1, - (byte)0x1f,(byte)0xfe,(byte)0x1f,(byte)0xfe, (byte)0x0e,(byte)0xfe,(byte)0x0e,(byte)0xfe, - (byte)0x01,(byte)0x1f,(byte)0x01,(byte)0x1f, (byte)0x01,(byte)0x0e,(byte)0x01,(byte)0x0e, - (byte)0xe0,(byte)0xfe,(byte)0xe0,(byte)0xfe, (byte)0xf1,(byte)0xfe,(byte)0xf1,(byte)0xfe, - (byte)0xfe,(byte)0x01,(byte)0xfe,(byte)0x01, (byte)0xfe,(byte)0x01,(byte)0xfe,(byte)0x01, - (byte)0xe0,(byte)0x1f,(byte)0xe0,(byte)0x1f, (byte)0xf1,(byte)0x0e,(byte)0xf1,(byte)0x0e, - (byte)0xe0,(byte)0x01,(byte)0xe0,(byte)0x01, (byte)0xf1,(byte)0x01,(byte)0xf1,(byte)0x01, - (byte)0xfe,(byte)0x1f,(byte)0xfe,(byte)0x1f, (byte)0xfe,(byte)0x0e,(byte)0xfe,(byte)0x0e, - (byte)0x1f,(byte)0x01,(byte)0x1f,(byte)0x01, (byte)0x0e,(byte)0x01,(byte)0x0e,(byte)0x01, - (byte)0xfe,(byte)0xe0,(byte)0xfe,(byte)0xe0, (byte)0xfe,(byte)0xf1,(byte)0xfe,(byte)0xf1 - }; - - /** - * Checks if the given DES key material is weak or semi-weak. - * - * @param key the buffer with the DES key material. - * @param offset the offset in <code>key</code>, where the DES key - * material starts. - * @return true if the given DES key material is weak or semi-weak, false otherwise. - * @exception InvalidKeyException if the given key material, starting at <code>offset</code> - * inclusive, is shorter than 8 bytes. - */ - public static boolean isWeak( - byte[] key, - int offset) - throws InvalidKeyException - { - if (key.length - offset < DES_KEY_LEN) - { - throw new InvalidKeyException("key material too short in DESKeySpec.isWeak"); - } - - nextkey: for (int i = 0; i < N_DES_WEAK_KEYS; i++) - { - for (int j = 0; j < DES_KEY_LEN; j++) - { - if (key[j + offset] != DES_weak_keys[i * DES_KEY_LEN + j]) - { - continue nextkey; - } - } - - return true; - } - return false; - } -} |