diff options
Diffstat (limited to 'core/src/main/java/org/bouncycastle/crypto/params/DESParameters.java')
| -rw-r--r-- | core/src/main/java/org/bouncycastle/crypto/params/DESParameters.java | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/params/DESParameters.java b/core/src/main/java/org/bouncycastle/crypto/params/DESParameters.java deleted file mode 100644 index 5bee3604..00000000 --- a/core/src/main/java/org/bouncycastle/crypto/params/DESParameters.java +++ /dev/null @@ -1,107 +0,0 @@ -package org.bouncycastle.crypto.params; - -public class DESParameters - extends KeyParameter -{ - public DESParameters( - byte[] key) - { - super(key); - - if (isWeakKey(key, 0)) - { - throw new IllegalArgumentException("attempt to create weak DES key"); - } - } - - /* - * DES Key length in bytes. - */ - static public final int DES_KEY_LENGTH = 8; - - /* - * 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 - }; - - /** - * DES has 16 weak keys. This method will check - * if the given DES key material is weak or semi-weak. - * Key material that is too short is regarded as weak. - * <p> - * See <a href="http://www.counterpane.com/applied.html">"Applied - * Cryptography"</a> by Bruce Schneier for more information. - * - * @return true if the given DES key material is weak or semi-weak, - * false otherwise. - */ - public static boolean isWeakKey( - byte[] key, - int offset) - { - if (key.length - offset < DES_KEY_LENGTH) - { - throw new IllegalArgumentException("key material too short."); - } - - nextkey: for (int i = 0; i < N_DES_WEAK_KEYS; i++) - { - for (int j = 0; j < DES_KEY_LENGTH; j++) - { - if (key[j + offset] != DES_weak_keys[i * DES_KEY_LENGTH + j]) - { - continue nextkey; - } - } - - return true; - } - return false; - } - - /** - * DES Keys use the LSB as the odd parity bit. This can - * be used to check for corrupt keys. - * - * @param bytes the byte array to set the parity on. - */ - public static void setOddParity( - byte[] bytes) - { - for (int i = 0; i < bytes.length; i++) - { - int b = bytes[i]; - bytes[i] = (byte)((b & 0xfe) | - ((((b >> 1) ^ - (b >> 2) ^ - (b >> 3) ^ - (b >> 4) ^ - (b >> 5) ^ - (b >> 6) ^ - (b >> 7)) ^ 0x01) & 0x01)); - } - } -} |