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Add an implementation of SM3 using the Zvksh extension. The assembly code is derived from OpenSSL code (openssl/openssl#21923) that was dual-licensed so that it could be reused in the kernel. Nevertheless, the assembly has been significantly reworked for integration with the kernel, for example by using a regular .S file instead of the so-called perlasm, using the assembler instead of bare '.inst', and greatly reducing code duplication. Co-developed-by: Christoph Müllner <christoph.muellner@vrull.eu> Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu> Co-developed-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Signed-off-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Signed-off-by: Jerry Shih <jerry.shih@sifive.com> Co-developed-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Eric Biggers <ebiggers@google.com> Link: https://lore.kernel.org/r/20240122002024.27477-10-ebiggers@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SM3 using the RISC-V vector crypto extensions
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*
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* Copyright (C) 2023 VRULL GmbH
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* Author: Heiko Stuebner <heiko.stuebner@vrull.eu>
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*
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* Copyright (C) 2023 SiFive, Inc.
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* Author: Jerry Shih <jerry.shih@sifive.com>
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*/
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#include <asm/simd.h>
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#include <asm/vector.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/simd.h>
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#include <crypto/sm3_base.h>
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#include <linux/linkage.h>
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#include <linux/module.h>
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/*
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* Note: the asm function only uses the 'state' field of struct sm3_state.
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* It is assumed to be the first field.
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*/
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asmlinkage void sm3_transform_zvksh_zvkb(
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struct sm3_state *state, const u8 *data, int num_blocks);
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static int riscv64_sm3_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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/*
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* Ensure struct sm3_state begins directly with the SM3
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* 256-bit internal state, as this is what the asm function expects.
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*/
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BUILD_BUG_ON(offsetof(struct sm3_state, state) != 0);
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if (crypto_simd_usable()) {
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kernel_vector_begin();
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sm3_base_do_update(desc, data, len, sm3_transform_zvksh_zvkb);
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kernel_vector_end();
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} else {
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sm3_update(shash_desc_ctx(desc), data, len);
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}
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return 0;
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}
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static int riscv64_sm3_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct sm3_state *ctx;
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if (crypto_simd_usable()) {
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kernel_vector_begin();
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if (len)
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sm3_base_do_update(desc, data, len,
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sm3_transform_zvksh_zvkb);
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sm3_base_do_finalize(desc, sm3_transform_zvksh_zvkb);
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kernel_vector_end();
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return sm3_base_finish(desc, out);
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}
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ctx = shash_desc_ctx(desc);
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if (len)
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sm3_update(ctx, data, len);
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sm3_final(ctx, out);
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return 0;
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}
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static int riscv64_sm3_final(struct shash_desc *desc, u8 *out)
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{
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return riscv64_sm3_finup(desc, NULL, 0, out);
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}
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static struct shash_alg riscv64_sm3_alg = {
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.init = sm3_base_init,
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.update = riscv64_sm3_update,
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.final = riscv64_sm3_final,
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.finup = riscv64_sm3_finup,
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.descsize = sizeof(struct sm3_state),
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.digestsize = SM3_DIGEST_SIZE,
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.base = {
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.cra_blocksize = SM3_BLOCK_SIZE,
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.cra_priority = 300,
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.cra_name = "sm3",
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.cra_driver_name = "sm3-riscv64-zvksh-zvkb",
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.cra_module = THIS_MODULE,
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},
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};
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static int __init riscv64_sm3_mod_init(void)
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{
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if (riscv_isa_extension_available(NULL, ZVKSH) &&
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riscv_isa_extension_available(NULL, ZVKB) &&
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riscv_vector_vlen() >= 128)
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return crypto_register_shash(&riscv64_sm3_alg);
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return -ENODEV;
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}
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static void __exit riscv64_sm3_mod_exit(void)
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{
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crypto_unregister_shash(&riscv64_sm3_alg);
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}
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module_init(riscv64_sm3_mod_init);
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module_exit(riscv64_sm3_mod_exit);
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MODULE_DESCRIPTION("SM3 (RISC-V accelerated)");
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MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@vrull.eu>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("sm3");
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