JAVA CRC32

/**
 * CRC-32
 * 
 * <table width="400px" border="1" cellpadding="0" cellspacing="0">
 *     <tr>
 *         <th>名称</th>
 *         <th>多项式</th>
 *         <th>初始值</th>
 *         <th>异或值</th>
 *         <th>Bit反转</th>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-32</td>
 *         <td align="center">0x04C11DB7</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-32/B</td>
 *         <td align="center">0x04C11DB7</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">MSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-32/C</td>
 *         <td align="center">0x1EDC6F41</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-32/D</td>
 *         <td align="center">0xA833982B</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">LSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-32/MPEG-2</td>
 *         <td align="center">0x04C11DB7</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">0x00000000</td>
 *         <td align="center">MSB First</td>
 *     </tr>
 *     <tr>
 *         <td>&nbsp; CRC-32/POSIX</td>
 *         <td align="center">0x04C11DB7</td>
 *         <td align="center">0x00000000</td>
 *         <td align="center">0xFFFFFFFF</td>
 *         <td align="center">MSB First</td>
 *     </tr>
 * </table>
 * 
 * @author unnamed
 *
 */
public class CRC32Utils {

    /**
     * CRC-32
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x04C11DB7</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static long CRC32(byte[] source, int offset, int length) {
        long wCRCin = 0xFFFFFFFFL;
        // Long.reverse(0x04C11DB7L) >>> 32
        long wCPoly = 0xEDB88320L;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((long) source[i] & 0x000000FFL);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x00000001L) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0xFFFFFFFFL;
    }

    /**
     * CRC-32/B
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x04C11DB7</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">MSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static long CRC32_B(byte[] source, int offset, int length) {
        long wCRCin = 0xFFFFFFFFL;
        long wCPoly = 0x04C11DB7L;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            for (int j = 0; j < 8; j++) {
                boolean bit = ((source[i] >> (7 - j) & 1) == 1);
                boolean c31 = ((wCRCin >> 31 & 1) == 1);
                wCRCin <<= 1;
                if (c31 ^ bit) {
                    wCRCin ^= wCPoly;
                }
            }
        }
        wCRCin &= 0xFFFFFFFFL;
        return wCRCin ^= 0xFFFFFFFFL;
    }

    /**
     * CRC-32/C
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x1EDC6F41</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static long CRC32_C(byte[] source, int offset, int length) {
        long wCRCin = 0xFFFFFFFFL;
        // Long.reverse(0x1EDC6F41L) >>> 32
        long wCPoly = 0x82F63B78L;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((long) source[i] & 0x000000FFL);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x00000001L) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0xFFFFFFFFL;
    }

    /**
     * CRC-32/D
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0xA833982B</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">LSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static long CRC32_D(byte[] source, int offset, int length) {
        long wCRCin = 0xFFFFFFFFL;
        // Long.reverse(0xA833982BL) >>> 32
        long wCPoly = 0xD419CC15L;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            wCRCin ^= ((long) source[i] & 0x000000FFL);
            for (int j = 0; j < 8; j++) {
                if ((wCRCin & 0x00000001L) != 0) {
                    wCRCin >>= 1;
                    wCRCin ^= wCPoly;
                } else {
                    wCRCin >>= 1;
                }
            }
        }
        return wCRCin ^= 0xFFFFFFFFL;
    }

    /**
     * CRC-32/MPEG-2
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x04C11DB7</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">0x00000000</td>
     *         <td align="center">MSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static long CRC32_MPEG_2(byte[] source, int offset, int length) {
        long wCRCin = 0xFFFFFFFFL;
        long wCPoly = 0x04C11DB7L;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            for (int j = 0; j < 8; j++) {
                boolean bit = ((source[i] >> (7 - j) & 1) == 1);
                boolean c31 = ((wCRCin >> 31 & 1) == 1);
                wCRCin <<= 1;
                if (c31 ^ bit) {
                    wCRCin ^= wCPoly;
                }
            }
        }
        wCRCin &= 0xFFFFFFFFL;
        return wCRCin ^= 0x00000000L;
    }

    /**
     * CRC-32/POSIX
     * 
     * <table width="400px" border="1" cellpadding="0" cellspacing="0">
     *     <tr>
     *         <th>多项式</th>
     *         <th>初始值</th>
     *         <th>异或值</th>
     *         <th>Bit反转</th>
     *     </tr>
     *     <tr>
     *         <td align="center">0x04C11DB7</td>
     *         <td align="center">0x00000000</td>
     *         <td align="center">0xFFFFFFFF</td>
     *         <td align="center">MSB First</td>
     *     </tr>
     * </table>
     * 
     * @param  source
     * @param  offset
     * @param  length
     * @return
     */
    public static long CRC32_POSIX(byte[] source, int offset, int length) {
        long wCRCin = 0x00000000L;
        long wCPoly = 0x04C11DB7L;
        for (int i = offset, cnt = offset + length; i < cnt; i++) {
            for (int j = 0; j < 8; j++) {
                boolean bit = ((source[i] >> (7 - j) & 1) == 1);
                boolean c31 = ((wCRCin >> 31 & 1) == 1);
                wCRCin <<= 1;
                if (c31 ^ bit) {
                    wCRCin ^= wCPoly;
                }
            }
        }
        wCRCin &= 0xFFFFFFFFL;
        return wCRCin ^= 0xFFFFFFFFL;
    }

}
转：https://blog.csdn.net/zte1055889498/article/details/102784519
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原文地址：https://www.cnblogs.com/vipsoft/p/16240497.html