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  • keygen

    public class KeyGen {
        public static short getCRC(String s, int i, byte[] bytes) {
            CRC32 crc32 = new CRC32();
            if (s != null) {
                for (int j = 0; j < s.length(); j++) {
                    char c = s.charAt(j);
                    crc32.update(c);
                }
            }
            crc32.update(i);
            crc32.update(i >> 8);
            crc32.update(i >> 16);
            crc32.update(i >> 24);
            for (int k = 0; k < bytes.length - 2; k++) {
                byte byte0 = bytes[k];
                crc32.update(byte0);
            }
            return (short) (int) crc32.getValue();
        }
    
        public static String encodeGroups(BigInteger biginteger) {
            BigInteger beginner1 = BigInteger.valueOf(60466176L);
            StringBuilder sb = new StringBuilder();
            for (int i = 0; biginteger.compareTo(BigInteger.ZERO) != 0; i++) {
                int j = biginteger.mod(beginner1).intValue();
                String s1 = encodeGroup(j);
                if (i > 0) {
                    sb.append("-");
                }
                sb.append(s1);
                biginteger = biginteger.divide(beginner1);
            }
            return sb.toString();
        }
    
        public static String encodeGroup(int i) {
            StringBuilder sb = new StringBuilder();
            for (int j = 0; j < 5; j++) {
                int k = i % 36;
                //char c;
                char c;
                if (k < 10)
                    c = (char) (48 + k);
                else {
                    c = (char) (65 + k - 10);
                }
                sb.append(c);
                i /= 36;
            }
            return sb.toString();
        }
    
        public static String MakeKey(String name, int days, int id, ProductType prtype) {
            id %= 10000;
            byte[] bkey = new byte[12];
            bkey[0] = (byte) prtype.id();
            bkey[1] = 13;
    
            Date d = new Date();
            long ld = d.getTime() >> 16;
            bkey[2] = (byte) (int) (ld & 0xFF);
            bkey[3] = (byte) (int) (ld >> 8 & 0xFF);
            bkey[4] = (byte) (int) (ld >> 16 & 0xFF);
            bkey[5] = (byte) (int) (ld >> 24 & 0xFF);
    
            days &= 65535;
            bkey[6] = (byte) (days & 0xFF);
            bkey[7] = (byte) (days >> 8 & 0xFF);
    
            bkey[8] = 105;
            bkey[9] = -59;
            bkey[10] = 0;
            bkey[11] = 0;
    
            int w = getCRC(name, id % 10000, bkey);
            bkey[10] = (byte) (w & 0xFF);
            bkey[11] = (byte) (w >> 8 & 0xFF);
    
            BigInteger pow = new BigInteger("89126272330128007543578052027888001981", 10);
            BigInteger mod = new BigInteger("86f71688cdd2612ca117d1f54bdae029", 16);
            BigInteger k0 = new BigInteger(bkey);
            BigInteger k1 = k0.modPow(pow, mod);
            String s0 = Integer.toString(id);
            String sz = "0";
            while (s0.length() != 5) {
                s0 = sz.concat(s0);
            }
            s0 = s0.concat("-");
    
            String s1 = encodeGroups(k1);
            s0 = s0.concat(s1);
            return s0;
        }
    
    }

    public enum ProductType {
    IDEA(1);

    
    

    private int id;

    
    

    private ProductType(int id) {
    this.id = id;
    }

    
    

    public int id() {
    return this.id;
    }

    
    

    public static ProductType getProductType(String str) {
    for (ProductType product : values())
    if (product.toString().equalsIgnoreCase(str))
    return product;
    return null;
    }
    }

     
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  • 原文地址:https://www.cnblogs.com/linxyz/p/3461754.html
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