cipher-mars.c

海思KEY驱动

/* NOTE: This implementation has been changed from the original source */

/* Copyright in this code is held by Dr B.R. Gladman but free direct or
 * derivative use is permit1ed subject to acknowledgement of its origin
 * and subject to any constraints placed on the use of the algorithm by
 * its designers (if such constraints may exist, this will be indicated
 * below).
 *
 * Dr. B. R. Gladman ([e-mail]). 25th January 2000.
 *
 * This is an implementation of MARS, an encryption algorithm designed by
 * a team at IBM and submit1ed as a candidate algorithm for the Advanced
 * Encryption Standard programme of the US National Institute of Standards
 * and Technology.
 *
 * The MARS algorithm is covered by a pending patent application owned by
 * IBM, who intend to offer a royalty free license under any issued patent
 * that results from such application if MARS is selected as the AES
 * algorithm.  In the interim, you may evaluate the MARS algorithm for
 * your personal, lawful, non-profit purposes as an end user.
 *
 * NOTE: this is the revised second round variant of MARS */

/* For an update regarding licensing see
 * http://www.tivoli.com/news/press/pressreleases/en/2000/mars.html */

/* Use first round variant of MARS */
/* #define CIPHER_MARS_ROUND_1 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/wordops.h>
#include <linux/crypto.h>

#ifdef MODULE_LICENSE
MODULE_LICENSE("Dual BSD/GPL");
#endif
#ifdef MODULE_DESCRIPTION
MODULE_DESCRIPTION ("MARS Cipher / CryptoAPI");
#endif
#ifdef MODULE_AUTHOR
MODULE_AUTHOR ("Dr Brian Gladman <[e-mail]>");
#endif

#if 0
#define rotl rotl32
#define rotr rotr32
#else
#define rotl generic_rotl32
#define rotr generic_rotr32
#endif

const static u32 s_box[] = {
	0x09d0c479, 0x28c8ffe0, 0x84aa6c39, 0x9dad7287,	/* 0x000 */
	0x7dff9be3, 0xd4268361, 0xc96da1d4, 0x7974cc93,
	0x85d0582e, 0x2a4b5705, 0x1ca16a62, 0xc3bd279d,
	0x0f1f25e5, 0x5160372f, 0xc695c1fb, 0x4d7ff1e4,
	0xae5f6bf4, 0x0d72ee46, 0xff23de8a, 0xb1cf8e83,	/* 0x010 */
	0xf14902e2, 0x3e981e42, 0x8bf53eb6, 0x7f4bf8ac,
	0x83631f83, 0x25970205, 0x76afe784, 0x3a7931d4,
	0x4f846450, 0x5c64c3f6, 0x210a5f18, 0xc6986a26,
	0x28f4e826, 0x3a60a81c, 0xd340a664, 0x7ea820c4,	/* 0x020 */
	0x526687c5, 0x7eddd12b, 0x32a11d1d, 0x9c9ef086,
	0x80f6e831, 0xab6f04ad, 0x56fb9b53, 0x8b2e095c,
	0xb68556ae, 0xd2250b0d, 0x294a7721, 0xe21fb253,
	0xae136749, 0xe82aae86, 0x93365104, 0x99404a66,	/* 0x030 */
	0x78a784dc, 0xb69ba84b, 0x04046793, 0x23db5c1e,
	0x46cae1d6, 0x2fe28134, 0x5a223942, 0x1863cd5b,
	0xc190c6e3, 0x07dfb846, 0x6eb88816, 0x2d0dcc4a,
	0xa4ccae59, 0x3798670d, 0xcbfa9493, 0x4f481d45,	/* 0x040 */
	0xeafc8ca8, 0xdb1129d6, 0xb0449e20, 0x0f5407fb,
	0x6167d9a8, 0xd1f45763, 0x4daa96c3, 0x3bec5958,
	0xababa014, 0xb6ccd201, 0x38d6279f, 0x02682215,
	0x8f376cd5, 0x092c237e, 0xbfc56593, 0x32889d2c,	/* 0x050 */
	0x854b3e95, 0x05bb9b43, 0x7dcd5dcd, 0xa02e926c,
	0xfae527e5, 0x36a1c330, 0x3412e1ae, 0xf257f462,
	0x3c4f1d71, 0x30a2e809, 0x68e5f551, 0x9c61ba44,
	0x5ded0ab8, 0x75ce09c8, 0x9654f93e, 0x698c0cca,	/* 0x060 */
	0x243cb3e4, 0x2b062b97, 0x0f3b8d9e, 0x00e050df,
	0xfc5d6166, 0xe35f9288, 0xc079550d, 0x0591aee8,
	0x8e531e74, 0x75fe3578, 0x2f6d829a, 0xf60b21ae,
	0x95e8eb8d, 0x6699486b, 0x901d7d9b, 0xfd6d6e31,	/* 0x070 */
	0x1090acef, 0xe0670dd8, 0xdab2e692, 0xcd6d4365,
	0xe5393514, 0x3af345f0, 0x6241fc4d, 0x460da3a3,
	0x7bcf3729, 0x8bf1d1e0, 0x14aac070, 0x1587ed55,
	0x3afd7d3e, 0xd2f29e01, 0x29a9d1f6, 0xefb10c53,	/* 0x080 */
	0xcf3b870f, 0xb414935c, 0x664465ed, 0x024acac7,
	0x59a744c1, 0x1d2936a7, 0xdc580aa6, 0xcf574ca8,
	0x040a7a10, 0x6cd81807, 0x8a98be4c, 0xaccea063,
	0xc33e92b5, 0xd1e0e03d, 0xb322517e, 0x2092bd13,	/* 0x090 */
	0x386b2c4a, 0x52e8dd58, 0x58656dfb, 0x50820371,
	0x41811896, 0xe337ef7e, 0xd39fb119, 0xc97f0df6,
	0x68fea01b, 0xa150a6e5, 0x55258962, 0xeb6ff41b,
	0xd7c9cd7a, 0xa619cd9e, 0xbcf09576, 0x2672c073,	/* 0x0a0 */
	0xf003fb3c, 0x4ab7a50b, 0x1484126a, 0x487ba9b1,
	0xa64fc9c6, 0xf6957d49, 0x38b06a75, 0xdd805fcd,
	0x63d094cf, 0xf51c999e, 0x1aa4d343, 0xb8495294,
	0xce9f8e99, 0xbffcd770, 0xc7c275cc, 0x378453a7,	/* 0x0b0 */
	0x7b21be33, 0x397f41bd, 0x4e94d131, 0x92cc1f98,
	0x5915ea51, 0x99f861b7, 0xc9980a88, 0x1d74fd5f,
	0xb0a495f8, 0x614deed0, 0xb5778eea, 0x5941792d,
	0xfa90c1f8, 0x33f824b4, 0xc4965372, 0x3ff6d550,	/* 0x0c0 */
	0x4ca5fec0, 0x8630e964, 0x5b3fbbd6, 0x7da26a48,
	0xb203231a, 0x04297514, 0x2d639306, 0x2eb13149,
	0x16a45272, 0x532459a0, 0x8e5f4872, 0xf966c7d9,
	0x07128dc0, 0x0d44db62, 0xafc8d52d, 0x06316131,	/* 0x0d0 */
	0xd838e7ce, 0x1bc41d00, 0x3a2e8c0f, 0xea83837e,
	0xb984737d, 0x13ba4891, 0xc4f8b949, 0xa6d6acb3,
	0xa215cdce, 0x8359838b, 0x6bd1aa31, 0xf579dd52,
	0x21b93f93, 0xf5176781, 0x187dfdde, 0xe94aeb76,	/* 0x0e0 */
	0x2b38fd54, 0x431de1da, 0xab394825, 0x9ad3048f,
	0xdfea32aa, 0x659473e3, 0x623f7863, 0xf3346c59,
	0xab3ab685, 0x3346a90b, 0x6b56443e, 0xc6de01f8,
	0x8d421fc0, 0x9b0ed10c, 0x88f1a1e9, 0x54c1f029,	/* 0x0f0 */
	0x7dead57b, 0x8d7ba426, 0x4cf5178a, 0x551a7cca,
	0x1a9a5f08, 0xfcd651b9, 0x25605182, 0xe11fc6c3,
	0xb6fd9676, 0x337b3027, 0xb7c8eb14, 0x9e5fd030,

	0x6b57e354, 0xad913cf7, 0x7e16688d, 0x58872a69,	/* 0x100 */
	0x2c2fc7df, 0xe389ccc6, 0x30738df1, 0x0824a734,
	0xe1797a8b, 0xa4a8d57b, 0x5b5d193b, 0xc8a8309b,
	0x73f9a978, 0x73398d32, 0x0f59573e, 0xe9df2b03,
	0xe8a5b6c8, 0x848d0704, 0x98df93c2, 0x720a1dc3,	/* 0x110 */
	0x684f259a, 0x943ba848, 0xa6370152, 0x863b5ea3,
	0xd17b978b, 0x6d9b58ef, 0x0a700dd4, 0xa73d36bf,
	0x8e6a0829, 0x8695bc14, 0xe35b3447, 0x933ac568,
	0x8894b022, 0x2f511c27, 0xddfbcc3c, 0x006662b6,	/* 0x120 */
	0x117c83fe, 0x4e12b414, 0xc2bca766, 0x3a2fec10,
	0xf4562420, 0x55792e2a, 0x46f5d857, 0xceda25ce,
	0xc3601d3b, 0x6c00ab46, 0xefac9c28, 0xb3c35047,
	0x611dfee3, 0x257c3207, 0xfdd58482, 0x3b14d84f,	/* 0x130 */
	0x23becb64, 0xa075f3a3, 0x088f8ead, 0x07adf158,
	0x7796943c, 0xfacabf3d, 0xc09730cd, 0xf7679969,
	0xda44e9ed, 0x2c854c12, 0x35935fa3, 0x2f057d9f,
	0x690624f8, 0x1cb0bafd, 0x7b0dbdc6, 0x810f23bb,	/* 0x140 */
	0xfa929a1a, 0x6d969a17, 0x6742979b, 0x74ac7d05,
	0x010e65c4, 0x86a3d963, 0xf907b5a0, 0xd0042bd3,
	0x158d7d03, 0x287a8255, 0xbba8366f, 0x096edc33,
	0x21916a7b, 0x77b56b86, 0x951622f9, 0xa6c5e650,	/* 0x150 */
	0x8cea17d1, 0xcd8c62bc, 0xa3d63433, 0x358a68fd,
	0x0f9b9d3c, 0xd6aa295b, 0xfe33384a, 0xc000738e,
	0xcd67eb2f, 0xe2eb6dc2, 0x97338b02, 0x06c9f246,
	0x419cf1ad, 0x2b83c045, 0x3723f18a, 0xcb5b3089,	/* 0x160 */
	0x160bead7, 0x5d494656, 0x35f8a74b, 0x1e4e6c9e,
	0x000399bd, 0x67466880, 0xb4174831, 0xacf423b2,
	0xca815ab3, 0x5a6395e7, 0x302a67c5, 0x8bdb446b,
	0x108f8fa4, 0x10223eda, 0x92b8b48b, 0x7f38d0ee,	/* 0x170 */
	0xab2701d4, 0x0262d415, 0xaf224a30, 0xb3d88aba,
	0xf8b2c3af, 0xdaf7ef70, 0xcc97d3b7, 0xe9614b6c,
	0x2baebff4, 0x70f687cf, 0x386c9156, 0xce092ee5,
	0x01e87da6, 0x6ce91e6a, 0xbb7bcc84, 0xc7922c20,	/* 0x180 */
	0x9d3b71fd, 0x060e41c6, 0xd7590f15, 0x4e03bb47,
	0x183c198e, 0x63eeb240, 0x2ddbf49a, 0x6d5cba54,
	0x923750af, 0xf9e14236, 0x7838162b, 0x59726c72,
	0x81b66760, 0xbb2926c1, 0x48a0ce0d, 0xa6c0496d,	/* 0x190 */
	0xad43507b, 0x718d496a, 0x9df057af, 0x44b1bde6,
	0x054356dc, 0xde7ced35, 0xd51a138b, 0x62088cc9,
	0x35830311, 0xc96efca2, 0x686f86ec, 0x8e77cb68,
	0x63e1d6b8, 0xc80f9778, 0x79c491fd, 0x1b4c67f2,	/* 0x1a0 */
	0x72698d7d, 0x5e368c31, 0xf7d95e2e, 0xa1d3493f,
	0xdcd9433e, 0x896f1552, 0x4bc4ca7a, 0xa6d1baf4,
	0xa5a96dcc, 0x0bef8b46, 0xa169fda7, 0x74df40b7,
	0x4e208804, 0x9a756607, 0x038e87c8, 0x20211e44,	/* 0x1b0 */
	0x8b7ad4bf, 0xc6403f35, 0x1848e36d, 0x80bdb038,
	0x1e62891c, 0x643d2107, 0xbf04d6f8, 0x21092c8c,
	0xf644f389, 0x0778404e, 0x7b78adb8, 0xa2c52d53,
	0x42157abe, 0xa2253e2e, 0x7bf3f4ae, 0x80f594f9,	/* 0x1c0 */
	0x953194e7, 0x77eb92ed, 0xb3816930, 0xda8d9336,
	0xbf447469, 0xf26d9483, 0xee6faed5, 0x71371235,
	0xde425f73, 0xb4e59f43, 0x7dbe2d4e, 0x2d37b185,
	0x49dc9a63, 0x98c39d98, 0x1301c9a2, 0x389b1bbf,	/* 0x1d0 */
	0x0c18588d, 0xa421c1ba, 0x7aa3865c, 0x71e08558,
	0x3c5cfcaa, 0x7d239ca4, 0x0297d9dd, 0xd7dc2830,
	0x4b37802b, 0x7428ab54, 0xaeee0347, 0x4b3fbb85,
	0x692f2f08, 0x134e578e, 0x36d9e0bf, 0xae8b5fcf,	/* 0x1e0 */
	0xedb93ecf, 0x2b27248e, 0x170eb1ef, 0x7dc57fd6,
	0x1e760f16, 0xb1136601, 0x864e1b9b, 0xd7ea7319,
	0x3ab871bd, 0xcfa4d76f, 0xe31bd782, 0x0dbeb469,
	0xabb96061, 0x5370f85d, 0xffb07e37, 0xda30d0fb,	/* 0x1f0 */
	0xebc977b6, 0x0b98b40f, 0x3a4d0fe6, 0xdf4fc26b,
	0x159cf22a, 0xc298d6e2, 0x2b78ef6a, 0x61a94ac0,
	0xab561187, 0x14eea0f0, 0xdf0d4164, 0x19af70ee
};

const static u32 b_tab[4] = {
	0xa4a8d57b, 0x5b5d193b, 0xc8a8309b, 0x73f9a978	/* s_box[265..268] */
};

#define f_mix(a,b,c,d)                  \
        r = rotr(a, 8);                 \
        b ^= s_box[a & 255];            \
        b += s_box[(r & 255) + 256];    \
        r = rotr(a, 16);                \
        a  = rotr(a, 24);               \
        c += s_box[r & 255];            \
        d ^= s_box[(a & 255) + 256]

#define b_mix(a,b,c,d)                  \
        r = rotl(a, 8);                 \
        b ^= s_box[(a & 255) + 256];    \
        c -= s_box[r & 255];            \
        r = rotl(a, 16);                \
        a  = rotl(a, 24);               \
        d -= s_box[(r & 255) + 256];    \
        d ^= s_box[a & 255]

#define f_ktr(a,b,c,d,i)    \
    m = a + l_key[i];       \
    a = rotl(a, 13);        \
    r = a * l_key[i + 1];   \
    l = s_box[m & 511];     \
    r = rotl(r, 5);         \
    c += rotl(m, r);        \
    l ^= r;                 \
    r = rotl(r, 5);         \
    l ^= r;                 \
    d ^= r;                 \
    b += rotl(l, r)

#define r_ktr(a,b,c,d,i)    \
    r = a * l_key[i + 1];   \
    a = rotr(a, 13);        \
    m = a + l_key[i];       \
    l = s_box[m & 511];     \
    r = rotl(r, 5);         \
    l ^= r;                 \
    c -= rotl(m, r);        \
    r = rotl(r, 5);         \
    l ^= r;                 \
    d ^= r;                 \
    b -= rotl(l, r)

#if defined(CIPHER_MARS_ROUND_1)
static int
mars_set_key (struct cipher_context *cx, const unsigned char *key, int key_len,
	      int atomic)
{
	u32 i, j, m, w;
	const u32 *in_key = (const u32 *) key;
	u32 *l_key = cx->keyinfo;
	u32 vk[47] = {
		0x09d0c479, 0x28c8ffe0, 0x84aa6c39, 0x9dad7287, 0x7dff9be3,
		0xd4268361, 0xc96da1d4	/* s_box[0..6] */
	};

	if (key_len != 16 && key_len != 24 && key_len != 32)
		return -EINVAL;	/* unsupported key length */

	cx->key_length = key_len;

	m = key_len / 4 - 1;

	for (i = j = 0; i < 39; ++i) {
		vk[i + 7] = rotl (vk[i] ^ vk[i + 5], 3) ^ in_key[j] ^ i;
		j = (j == m ? 0 : j + 1);
	}

	vk[46] = key_len / 4;

	for (j = 0; j < 7; ++j) {
		for (i = 1; i < 40; ++i)
			vk[i + 7] =
			    rotl (vk[i + 7] + s_box[vk[i + 6] & 511], 9);

		vk[7] = rotl (vk[7] + s_box[vk[46] & 511], 9);
	}

	for (i = j = 0; i < 40; ++i) {
		l_key[j] = vk[i + 7];
		j = (j < 33 ? j + 7 : j - 33);
	}

	for (i = 5; i < 37; i += 2) {
		w = l_key[i] | 3;
		m = (~w ^ (w >> 1)) & 0x7fffffff;
		m &= (m >> 1) & (m >> 2);
		m &= (m >> 3) & (m >> 6);

		if (m) {
			m <<= 1;
			m |= (m << 1);
			m |= (m << 2);
			m |= (m << 4);
			m |= (m << 1) & ~w & 0x80000000;
			m &= 0xfffffffc;
			w ^= (rotl (b_tab[l_key[i] & 3], l_key[i + 3] & 31) &
			      m);
		}

		l_key[i] = w;
	}