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JavaSE Message Digest |
package com.snail.example;
import sun.misc.HexDumpEncoder;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MessageDigestExam {
private static HexDumpEncoder hex = new HexDumpEncoder();
public static void main(String[] args) {
try {
byte[] uid1 = getUID("MD2");
byte[] uid2 = getUID("MD5");
byte[] uid3 = getUID("SHA-1");
byte[] uid4 = getUID("SHA-256");
byte[] uid5 = getUID("SHA-384");
byte[] uid6 = getUID("SHA-512");
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
private static byte[] getUID(String algorithm)
throws UnknownHostException, NoSuchAlgorithmException {
// Create an unique String (IP Addr + Time + random Value)
StringBuilder sb = new StringBuilder();
sb.append(InetAddress.getLocalHost().toString());
sb.append(System.currentTimeMillis());
sb.append(System.nanoTime());
sb.append(Math.random());
// Calculate digest of the unique string.
MessageDigest md = MessageDigest.getInstance(algorithm);
md.update(sb.toString().getBytes());
byte[] digest = md.digest();
System.out.println("ALGORITHM : " + md.getAlgorithm());
System.out.println("KEY LENGTH : " + md.getDigestLength());
System.out.println(hex.encode(digest));
return digest;
}
}
ALGORITHM : MD2 KEY LENGTH : 16 0000: 36 B6 DE 35 19 63 54 13 94 01 BA 10 AC 59 EE 61 6..5.cT......Y.a ALGORITHM : MD5 KEY LENGTH : 16 0000: FB 41 AD BB 3D D4 D7 BC 43 62 91 CD 02 B9 BC E7 .A..=...Cb...... ALGORITHM : SHA-1 KEY LENGTH : 20 0000: 26 DF 65 9F AB 20 09 D0 34 34 F4 7D 11 CC 01 DC &.e.. ..44...... 0010: 8D 03 47 C1 ALGORITHM : SHA-256 KEY LENGTH : 32 0000: FF D5 42 3C C8 78 8E 50 A1 A5 A0 EE 8A D9 BE 44 ..B<.x.P.......D 0010: 53 1D 6E 63 9B 8B DE CB 34 40 74 C4 24 82 1C 87 S.nc....4@t.$... ALGORITHM : SHA-384 KEY LENGTH : 48 0000: 4B 9D E0 A9 0A 56 20 B8 2B 94 5E B6 E3 80 80 22 K....V .+.^...." 0010: DE 26 0B 41 92 61 B1 91 C8 53 4E 67 6B 03 C2 E3 .&.A.a...SNgk... 0020: C2 47 7E 3C F5 07 9B EE 15 0E A9 18 FE 9A 17 84 .G.<............ ALGORITHM : SHA-512 KEY LENGTH : 64 0000: 85 E7 07 B7 A4 21 6C BE 22 41 62 FB 42 44 CA AC .....!l."Ab.BD.. 0010: BC A0 84 58 87 90 A1 03 62 D9 54 13 68 AB AB FF ...X....b.T.h... 0020: 40 43 16 66 4A D6 E4 7F F3 F0 EF 4A 77 A6 14 8F @C.fJ......Jw... 0030: 18 28 B7 EE 4D CC 94 B2 E1 7E E7 3F 49 ED C6 F9 .(..M......?I...
ちゃんと呼び出す毎に Unique な ID が生成されているよってことで
ALGORITHM : MD2 KEY LENGTH : 16 0000: A7 36 07 D7 68 CB CD CF 55 03 97 E7 12 F8 7F B9 .6..h...U....... ALGORITHM : MD5 KEY LENGTH : 16 0000: 33 4F 12 BB BA B4 FA EA 64 95 F8 AA DB 1A BC 5F 3O......d......_ ALGORITHM : SHA-1 KEY LENGTH : 20 0000: 75 95 17 35 73 9D 97 A1 4C DB EA CE 9D 38 75 D7 u..5s...L....8u. 0010: EC A2 A4 E1 ALGORITHM : SHA-256 KEY LENGTH : 32 0000: 26 C1 70 EA 80 F6 4F F9 A2 60 A3 C2 94 C0 45 14 &.p...O..`....E. 0010: A9 B3 D8 50 72 58 AE 17 45 97 9E 70 21 A7 27 C4 ...PrX..E..p!.'. ALGORITHM : SHA-384 KEY LENGTH : 48 0000: DD 15 2A D7 CA AC 12 E7 AC 0D 33 87 49 9B 6A B0 ..*.......3.I.j. 0010: 4C 8A 27 7A DE 6F 18 8D 8A 23 12 E9 C9 E7 8B 12 L.'z.o...#...... 0020: 7B 96 C3 2F 3F B5 EE 54 FE 13 EC 3B A2 20 42 93 .../?..T...;.B. ALGORITHM : SHA-512 KEY LENGTH : 64 0000: CA BF F4 1C BB A1 47 46 CC 94 FC 8A 4E 99 B0 A6 ......GF....N... 0010: 0C B6 C4 97 A6 F2 75 E0 E6 D1 FE 90 A3 90 1C 39 ......u........9 0020: 26 6F A4 1B 27 49 2D 45 2B CD 6B 19 87 AE 0C 89 &o..'I-E+.k..... 0030: D2 F1 5D 5C 0D 47 F6 97 32 8F 30 F9 E5 97 D5 19 ..]\.G..2.0.....
