Cryptography Tutorials - Tutorial Addendum - DES Algorithm - Illustrated with Java Programs
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clandestine changeless abandoned printBytes(byte data, Cord name) {
System.out.println("");
System.out.println(name+":");
for (int i=0; i<data.length; i++) {
System.out.print(byteToBits(data)+" ");
}
System.out.println();
}
clandestine changeless Cord byteToBits(byte b) {
StringBuffer buf = new StringBuffer();
for (int i=0; i<8; i++)
buf.append((int)(b>>(8-(i+1)) & 0x0001));
acknowledgment buf.toString();
}
clandestine changeless byte getTestKey() {
Cord strKey = " 00010011 00110100 01010111 01111001"
+" 10011011 10111100 11011111 11110001";
byte theKey = new byte;
for (int i=0; i<8; i++) {
Cord strByte = strKey.substring(9*i+1,9*i+1+8);
theKey = (byte) Integer.parseInt(strByte,2);
}
acknowledgment theKey;
}
clandestine changeless boolean validateSubkeys(byte subKeys) {
boolean ok = true;
String strKeys = {
" 00011011 00000010 11101111 11111100 01110000 01110010",//1
" 01111001 10101110 11011001 11011011 11001001 11100101",//2
" 01010101 11111100 10001010 01000010 11001111 10011001",//3
" 01110010 10101101 11010110 11011011 00110101 00011101",//4
" 01111100 11101100 00000111 11101011 01010011 10101000",//5
" 01100011 10100101 00111110 01010000 01111011 00101111",//6
" 11101100 10000100 10110111 11110110 00011000 10111100",//7
" 11110111 10001010 00111010 11000001 00111011 11111011",//8
" 11100000 11011011 11101011 11101101 11100111 10000001",//9
" 10110001 11110011 01000111 10111010 01000110 01001111",//0
" 00100001 01011111 11010011 11011110 11010011 10000110",//1
" 01110101 01110001 11110101 10010100 01100111 11101001",//2
" 10010111 11000101 11010001 11111010 10111010 01000001",//3
" 01011111 01000011 10110111 11110010 11100111 00111010",//4
" 10111111 10010001 10001101 00111101 00111111 00001010",//5
" 11001011 00111101 10001011 00001110 00010111 11110101"};
for (int k=0; k<16; k++) {
for (int i=0; i<6; i++) {
Cord strByte = strKeys.substring(9*i+1,9*i+1+8);
byte keyByte = (byte) Integer.parseInt(strByte,2);
if (keyByte!=subKeys) ok = false;
}
}
acknowledgment ok;
}
}
In this program, the ascribe key is harder coded to the aforementioned aforementioned amount acclimated by
J. Orlin Grabbe in "The DES Algorithm Illustrated". The subkeys generated
by the algorithm are accurate with those mentioned by J. Orlin Grabbe.
If you run this program with JDK 1.4.1, you will get:
Input key:
00010011 00110100 01010111 01111001 10011011 10111100 11011111 111...
After permuted best 1 - Alive key:
11110000 11001100 10101010 11110101 01010110 01100111 10001111
Subkey #1 afterwards shifting:
11100001 10011001 01010101 11111010 10101100 11001111 00011110
Subkey #1 afterwards permuted best 2:
00011011 00000010 11101111 11111100 01110000 01110010
Subkey #2 afterwards shifting:
11000011 00110010 10101011 11110101 01011001 10011110 00111101
Subkey #2 afterwards permuted best 2:
01111001 10101110 11011001 11011011 11001001 11100101
Subkey #3 afterwards shifting:
00001100 11001010 10101111 11110101 01100110 01111000 11110101
Subkey #3 afterwards permuted best 2:
01010101 11111100 10001010 01000010 11001111 10011001
Subkey #4 afterwards shifting:
00110011 00101010 10111111 11000101 10011001 11100011 11010101
Subkey #4 afterwards permuted best 2:
01110010 10101101 11010110 11011011 00110101 00011101
Subkey #5 afterwards shifting:
11001100 10101010 11111111 00000110 01100111 10001111 01010101
Subkey #5 afterwards permuted best 2:
01111100 11101100 00000111 11101011 01010011 10101000
Subkey #6 afterwards shifting:
00110010 10101011 11111100 00111001 10011110 00111101 01010101
Subkey #6 afterwards permuted best 2:
01100011 10100101 00111110 01010000 01111011 00101111
Subkey #7 afterwards shifting:
11001010 10101111 11110000 11000110 01111000 11110101 01010110
Subkey #7 afterwards permuted best 2:
11101100 10000100 10110111 11110110 00011000 10111100
Subkey #8 afterwards shifting:
00101010 10111111 11000011 00111001 11100011 11010101 01011001
Subkey #8 afterwards permuted best 2:
11110111 10001010 00111010 11000001 00111011 11111011
Subkey #9 afterwards shifting:
01010101 01111111 10000110 01100011 11000111 10101010 10110011
Subkey #9 afterwards permuted best 2:
11100000 11011011 11101011 11101101 11100111 10000001
Subkey #10 afterwards shifting:
01010101 11111110 00011001 10011111 00011110 10101010 11001100
Subkey #10 afterwards permuted best 2:
10110001 11110011 01000111 10111010 01000110 01001111
Subkey #11 afterwards shifting:
01010111 11111000 01100110 01011100 01111010 10101011 00110011
Subkey #11 afterwards permuted best 2:
00100001 01011111 11010011 11011110 11010011 10000110
Subkey #12 afterwards shifting:
01011111 11100001 10011001 01010001 11101010 10101100 11001111
Subkey #12 afterwards permuted best 2:
01110101 01110001 11110101 10010100 01100111 11101001
Subkey #13 afterwards shifting:
01111111 10000110 01100101 01010111 10101010 10110011 00111100
Subkey #13 afterwards permuted best 2:
10010111 11000101 11010001 11111010 10111010 01000001
Subkey #14 afterwards shifting:
11111110 00011001 10010101 01011110 10101010 11001100 11110001
Subkey #14 afterwards permuted best 2:
01011111 01000011 10110111 11110010 11100111 00111010
Subkey #15 afterwards shifting:
11111000 01100110 01010101 01111010 10101011 00110011 11000111
Subkey #15 afterwards permuted best 2:
10111111 10010001 10001101 00111101 00111111 00001010
Subkey #16 afterwards shifting:
11110000 11001100 10101010 11110101 01010110 01100111 10001111
Subkey #16 afterwards permuted best 2:
11001011 00111101 10001011 00001110 00010111 11110101
DES subkeys analysis result: true
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