--- /dev/null
+/* sm4.c
+
+ Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
+
+ This file is part of GNU Nettle.
+
+ GNU Nettle is free software: you can redistribute it and/or
+ modify it under the terms of either:
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your
+ option) any later version.
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your
+ option) any later version.
+
+ or both in parallel, as here.
+
+ GNU Nettle is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see http://www.gnu.org/licenses/.
+*/
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <assert.h>
+#include <string.h>
+
+#include "sm4.h"
+
+#include "macros.h"
+
+
+static const uint32_t fk[4] =
+{
+ 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc
+};
+
+static const uint32_t ck[32] =
+{
+ 0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
+ 0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
+ 0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
+ 0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
+ 0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
+ 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
+ 0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
+ 0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
+};
+
+static const uint8_t sbox[256] =
+{
+ 0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7,
+ 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
+ 0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3,
+ 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
+ 0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a,
+ 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
+ 0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95,
+ 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
+ 0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba,
+ 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
+ 0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b,
+ 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
+ 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2,
+ 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
+ 0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52,
+ 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
+ 0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5,
+ 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
+ 0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55,
+ 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
+ 0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60,
+ 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
+ 0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f,
+ 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
+ 0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f,
+ 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
+ 0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd,
+ 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
+ 0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e,
+ 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
+ 0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20,
+ 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48
+};
+
+static uint32_t
+sm4_t_non_lin_sub(uint32_t x)
+{
+ uint32_t out;
+
+ out = (uint32_t)sbox[x & 0xff];
+ out |= (uint32_t)sbox[(x >> 8) & 0xff] << 8;
+ out |= (uint32_t)sbox[(x >> 16) & 0xff] << 16;
+ out |= (uint32_t)sbox[(x >> 24) & 0xff] << 24;
+
+ return out;
+}
+
+static uint32_t
+sm4_key_lin_sub(uint32_t x)
+{
+ return x ^ ROTL32(13, x) ^ ROTL32(23, x);
+}
+
+static uint32_t
+sm4_enc_lin_sub(uint32_t x)
+{
+ return x ^ ROTL32(2, x) ^ ROTL32(10, x) ^ ROTL32(18, x) ^ ROTL32(24, x);
+}
+
+static uint32_t
+sm4_key_sub(uint32_t x)
+{
+ return sm4_key_lin_sub(sm4_t_non_lin_sub(x));
+}
+
+static uint32_t
+sm4_enc_sub(uint32_t x)
+{
+ return sm4_enc_lin_sub(sm4_t_non_lin_sub(x));
+}
+
+static uint32_t
+sm4_round(uint32_t x0, uint32_t x1, uint32_t x2, uint32_t x3, uint32_t rk)
+{
+ return x0 ^ sm4_enc_sub(x1 ^ x2 ^ x3 ^ rk);
+}
+
+static void
+sm4_set_key(struct sm4_ctx *ctx, const uint8_t *key, int encrypt)
+{
+ uint32_t rk0, rk1, rk2, rk3;
+ unsigned i;
+
+ rk0 = READ_UINT32(key + 0) ^ fk[0];
+ rk1 = READ_UINT32(key + 4) ^ fk[1];
+ rk2 = READ_UINT32(key + 8) ^ fk[2];
+ rk3 = READ_UINT32(key + 12) ^ fk[3];
+
+ for (i = 0; i < 32; i += 4)
+ {
+ rk0 ^= sm4_key_sub(rk1 ^ rk2 ^ rk3 ^ ck[i + 0]);
+ rk1 ^= sm4_key_sub(rk2 ^ rk3 ^ rk0 ^ ck[i + 1]);
+ rk2 ^= sm4_key_sub(rk3 ^ rk0 ^ rk1 ^ ck[i + 2]);
+ rk3 ^= sm4_key_sub(rk0 ^ rk1 ^ rk2 ^ ck[i + 3]);
+
+ if (encrypt)
+ {
+ ctx->rkey[i + 0] = rk0;
+ ctx->rkey[i + 1] = rk1;
+ ctx->rkey[i + 2] = rk2;
+ ctx->rkey[i + 3] = rk3;
+ }
+ else
+ {
+ ctx->rkey[31 - 0 - i] = rk0;
+ ctx->rkey[31 - 1 - i] = rk1;
+ ctx->rkey[31 - 2 - i] = rk2;
+ ctx->rkey[31 - 3 - i] = rk3;
+ }
+ }
+}
+
+void
+sm4_set_encrypt_key(struct sm4_ctx *ctx, const uint8_t *key)
+{
+ sm4_set_key(ctx, key, 1);
+}
+
+void
+sm4_set_decrypt_key(struct sm4_ctx *ctx, const uint8_t *key)
+{
+ sm4_set_key(ctx, key, 0);
+}
+
+void
+sm4_crypt(const struct sm4_ctx *context,
+ size_t length,
+ uint8_t *dst,
+ const uint8_t *src)
+{
+ const uint32_t *rk = context->rkey;
+
+ assert( !(length % SM4_BLOCK_SIZE) );
+
+ for ( ; length; length -= SM4_BLOCK_SIZE)
+ {
+ uint32_t x0, x1, x2, x3;
+ unsigned i;
+
+ x0 = READ_UINT32(src + 0 * 4);
+ x1 = READ_UINT32(src + 1 * 4);
+ x2 = READ_UINT32(src + 2 * 4);
+ x3 = READ_UINT32(src + 3 * 4);
+
+ for (i = 0; i < 32; i += 4)
+ {
+ x0 = sm4_round(x0, x1, x2, x3, rk[i + 0]);
+ x1 = sm4_round(x1, x2, x3, x0, rk[i + 1]);
+ x2 = sm4_round(x2, x3, x0, x1, rk[i + 2]);
+ x3 = sm4_round(x3, x0, x1, x2, rk[i + 3]);
+ }
+
+ WRITE_UINT32(dst + 0 * 4, x3);
+ WRITE_UINT32(dst + 1 * 4, x2);
+ WRITE_UINT32(dst + 2 * 4, x1);
+ WRITE_UINT32(dst + 3 * 4, x0);
+
+ src += SM4_BLOCK_SIZE;
+ dst += SM4_BLOCK_SIZE;
+ }
+}
projects / thirdparty / nettle.git / commitdiff
