1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * SM3 using the RISC-V vector crypto extensions
4 *
5 * Copyright (C) 2023 VRULL GmbH
6 * Author: Heiko Stuebner <heiko.stuebner@vrull.eu>
7 *
8 * Copyright (C) 2023 SiFive, Inc.
9 * Author: Jerry Shih <jerry.shih@sifive.com>
10 */
11
12 #include <asm/simd.h>
13 #include <asm/vector.h>
14 #include <crypto/internal/hash.h>
15 #include <crypto/internal/simd.h>
16 #include <crypto/sm3_base.h>
17 #include <linux/linkage.h>
18 #include <linux/module.h>
19
20 /*
21 * Note: the asm function only uses the 'state' field of struct sm3_state.
22 * It is assumed to be the first field.
23 */
24 asmlinkage void sm3_transform_zvksh_zvkb(
25 struct sm3_state *state, const u8 *data, int num_blocks);
26
27 static int riscv64_sm3_update(struct shash_desc *desc, const u8 *data,
28 unsigned int len)
29 {
30 /*
31 * Ensure struct sm3_state begins directly with the SM3
32 * 256-bit internal state, as this is what the asm function expects.
33 */
34 BUILD_BUG_ON(offsetof(struct sm3_state, state) != 0);
35
36 if (crypto_simd_usable()) {
37 kernel_vector_begin();
38 sm3_base_do_update(desc, data, len, sm3_transform_zvksh_zvkb);
39 kernel_vector_end();
40 } else {
41 sm3_update(shash_desc_ctx(desc), data, len);
42 }
43 return 0;
44 }
45
46 static int riscv64_sm3_finup(struct shash_desc *desc, const u8 *data,
47 unsigned int len, u8 *out)
48 {
49 struct sm3_state *ctx;
50
51 if (crypto_simd_usable()) {
52 kernel_vector_begin();
53 if (len)
54 sm3_base_do_update(desc, data, len,
55 sm3_transform_zvksh_zvkb);
56 sm3_base_do_finalize(desc, sm3_transform_zvksh_zvkb);
57 kernel_vector_end();
58
59 return sm3_base_finish(desc, out);
60 }
61
62 ctx = shash_desc_ctx(desc);
63 if (len)
64 sm3_update(ctx, data, len);
65 sm3_final(ctx, out);
66
67 return 0;
68 }
69
70 static int riscv64_sm3_final(struct shash_desc *desc, u8 *out)
71 {
72 return riscv64_sm3_finup(desc, NULL, 0, out);
73 }
74
75 static struct shash_alg riscv64_sm3_alg = {
76 .init = sm3_base_init,
77 .update = riscv64_sm3_update,
78 .final = riscv64_sm3_final,
79 .finup = riscv64_sm3_finup,
80 .descsize = sizeof(struct sm3_state),
81 .digestsize = SM3_DIGEST_SIZE,
82 .base = {
83 .cra_blocksize = SM3_BLOCK_SIZE,
84 .cra_priority = 300,
85 .cra_name = "sm3",
86 .cra_driver_name = "sm3-riscv64-zvksh-zvkb",
87 .cra_module = THIS_MODULE,
88 },
89 };
90
91 static int __init riscv64_sm3_mod_init(void)
92 {
93 if (riscv_isa_extension_available(NULL, ZVKSH) &&
94 riscv_isa_extension_available(NULL, ZVKB) &&
95 riscv_vector_vlen() >= 128)
96 return crypto_register_shash(&riscv64_sm3_alg);
97
98 return -ENODEV;
99 }
100
101 static void __exit riscv64_sm3_mod_exit(void)
102 {
103 crypto_unregister_shash(&riscv64_sm3_alg);
104 }
105
106 module_init(riscv64_sm3_mod_init);
107 module_exit(riscv64_sm3_mod_exit);
108
109 MODULE_DESCRIPTION("SM3 (RISC-V accelerated)");
110 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@vrull.eu>");
111 MODULE_LICENSE("GPL");
112 MODULE_ALIAS_CRYPTO("sm3");
113
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