1/*
 2 *      crc7.c
 3 *
 4 * This source code is licensed under the GNU General Public License,
 5 * Version 2. See the file COPYING for more details.
 6 */
 7
 8#include <linux/types.h>
 9#include <linux/module.h>
10#include <linux/crc7.h>
11
12
13/* Table for CRC-7 (polynomial x^7 + x^3 + 1) */
14const u8 crc7_syndrome_table[256] = {
15	0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
16	0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
17	0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
18	0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
19	0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
20	0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
21	0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
22	0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
23	0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
24	0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
25	0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
26	0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
27	0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
28	0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
29	0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
30	0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
31	0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
32	0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
33	0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
34	0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
35	0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
36	0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
37	0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
38	0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
39	0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
40	0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
41	0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
42	0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
43	0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
44	0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
45	0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
46	0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
47};
48EXPORT_SYMBOL(crc7_syndrome_table);
49
50/**
51 * crc7 - update the CRC7 for the data buffer
52 * @crc:     previous CRC7 value
53 * @buffer:  data pointer
54 * @len:     number of bytes in the buffer
55 * Context: any
56 *
57 * Returns the updated CRC7 value.
58 */
59u8 crc7(u8 crc, const u8 *buffer, size_t len)
60{
61	while (len--)
62		crc = crc7_byte(crc, *buffer++);
63	return crc;
64}
65EXPORT_SYMBOL(crc7);
66
67MODULE_DESCRIPTION("CRC7 calculations");
68MODULE_LICENSE("GPL");

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 *      crc7.c
 4 */
 5
 6#include <linux/types.h>
 7#include <linux/module.h>
 8#include <linux/crc7.h>
 9
10
11/*
12 * Table for CRC-7 (polynomial x^7 + x^3 + 1).
13 * This is a big-endian CRC (msbit is highest power of x),
14 * aligned so the msbit of the byte is the x^6 coefficient
15 * and the lsbit is not used.
16 */
17const u8 crc7_be_syndrome_table[256] = {
18	0x00, 0x12, 0x24, 0x36, 0x48, 0x5a, 0x6c, 0x7e,
19	0x90, 0x82, 0xb4, 0xa6, 0xd8, 0xca, 0xfc, 0xee,
20	0x32, 0x20, 0x16, 0x04, 0x7a, 0x68, 0x5e, 0x4c,
21	0xa2, 0xb0, 0x86, 0x94, 0xea, 0xf8, 0xce, 0xdc,
22	0x64, 0x76, 0x40, 0x52, 0x2c, 0x3e, 0x08, 0x1a,
23	0xf4, 0xe6, 0xd0, 0xc2, 0xbc, 0xae, 0x98, 0x8a,
24	0x56, 0x44, 0x72, 0x60, 0x1e, 0x0c, 0x3a, 0x28,
25	0xc6, 0xd4, 0xe2, 0xf0, 0x8e, 0x9c, 0xaa, 0xb8,
26	0xc8, 0xda, 0xec, 0xfe, 0x80, 0x92, 0xa4, 0xb6,
27	0x58, 0x4a, 0x7c, 0x6e, 0x10, 0x02, 0x34, 0x26,
28	0xfa, 0xe8, 0xde, 0xcc, 0xb2, 0xa0, 0x96, 0x84,
29	0x6a, 0x78, 0x4e, 0x5c, 0x22, 0x30, 0x06, 0x14,
30	0xac, 0xbe, 0x88, 0x9a, 0xe4, 0xf6, 0xc0, 0xd2,
31	0x3c, 0x2e, 0x18, 0x0a, 0x74, 0x66, 0x50, 0x42,
32	0x9e, 0x8c, 0xba, 0xa8, 0xd6, 0xc4, 0xf2, 0xe0,
33	0x0e, 0x1c, 0x2a, 0x38, 0x46, 0x54, 0x62, 0x70,
34	0x82, 0x90, 0xa6, 0xb4, 0xca, 0xd8, 0xee, 0xfc,
35	0x12, 0x00, 0x36, 0x24, 0x5a, 0x48, 0x7e, 0x6c,
36	0xb0, 0xa2, 0x94, 0x86, 0xf8, 0xea, 0xdc, 0xce,
37	0x20, 0x32, 0x04, 0x16, 0x68, 0x7a, 0x4c, 0x5e,
38	0xe6, 0xf4, 0xc2, 0xd0, 0xae, 0xbc, 0x8a, 0x98,
39	0x76, 0x64, 0x52, 0x40, 0x3e, 0x2c, 0x1a, 0x08,
40	0xd4, 0xc6, 0xf0, 0xe2, 0x9c, 0x8e, 0xb8, 0xaa,
41	0x44, 0x56, 0x60, 0x72, 0x0c, 0x1e, 0x28, 0x3a,
42	0x4a, 0x58, 0x6e, 0x7c, 0x02, 0x10, 0x26, 0x34,
43	0xda, 0xc8, 0xfe, 0xec, 0x92, 0x80, 0xb6, 0xa4,
44	0x78, 0x6a, 0x5c, 0x4e, 0x30, 0x22, 0x14, 0x06,
45	0xe8, 0xfa, 0xcc, 0xde, 0xa0, 0xb2, 0x84, 0x96,
46	0x2e, 0x3c, 0x0a, 0x18, 0x66, 0x74, 0x42, 0x50,
47	0xbe, 0xac, 0x9a, 0x88, 0xf6, 0xe4, 0xd2, 0xc0,
48	0x1c, 0x0e, 0x38, 0x2a, 0x54, 0x46, 0x70, 0x62,
49	0x8c, 0x9e, 0xa8, 0xba, 0xc4, 0xd6, 0xe0, 0xf2
50};
51EXPORT_SYMBOL(crc7_be_syndrome_table);
52
53/**
54 * crc7 - update the CRC7 for the data buffer
55 * @crc:     previous CRC7 value
56 * @buffer:  data pointer
57 * @len:     number of bytes in the buffer
58 * Context: any
59 *
60 * Returns the updated CRC7 value.
61 * The CRC7 is left-aligned in the byte (the lsbit is always 0), as that
62 * makes the computation easier, and all callers want it in that form.
63 *
64 */
65u8 crc7_be(u8 crc, const u8 *buffer, size_t len)
66{
67	while (len--)
68		crc = crc7_be_byte(crc, *buffer++);
69	return crc;
70}
71EXPORT_SYMBOL(crc7_be);
72
73MODULE_DESCRIPTION("CRC7 calculations");
74MODULE_LICENSE("GPL");