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-rw-r--r--arch/riscv/crypto/sm4-riscv64-glue.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/riscv/crypto/sm4-riscv64-glue.c b/arch/riscv/crypto/sm4-riscv64-glue.c
new file mode 100644
index 0000000000..47fb84ebe5
--- /dev/null
+++ b/arch/riscv/crypto/sm4-riscv64-glue.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SM4 using the RISC-V vector crypto extensions
+ *
+ * Copyright (C) 2023 VRULL GmbH
+ * Author: Heiko Stuebner <heiko.stuebner@vrull.eu>
+ *
+ * Copyright (C) 2023 SiFive, Inc.
+ * Author: Jerry Shih <jerry.shih@sifive.com>
+ */
+
+#include <asm/simd.h>
+#include <asm/vector.h>
+#include <crypto/internal/cipher.h>
+#include <crypto/internal/simd.h>
+#include <crypto/sm4.h>
+#include <linux/linkage.h>
+#include <linux/module.h>
+
+asmlinkage void sm4_expandkey_zvksed_zvkb(const u8 user_key[SM4_KEY_SIZE],
+ u32 rkey_enc[SM4_RKEY_WORDS],
+ u32 rkey_dec[SM4_RKEY_WORDS]);
+asmlinkage void sm4_crypt_zvksed_zvkb(const u32 rkey[SM4_RKEY_WORDS],
+ const u8 in[SM4_BLOCK_SIZE],
+ u8 out[SM4_BLOCK_SIZE]);
+
+static int riscv64_sm4_setkey(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (crypto_simd_usable()) {
+ if (keylen != SM4_KEY_SIZE)
+ return -EINVAL;
+ kernel_vector_begin();
+ sm4_expandkey_zvksed_zvkb(key, ctx->rkey_enc, ctx->rkey_dec);
+ kernel_vector_end();
+ return 0;
+ }
+ return sm4_expandkey(ctx, key, keylen);
+}
+
+static void riscv64_sm4_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (crypto_simd_usable()) {
+ kernel_vector_begin();
+ sm4_crypt_zvksed_zvkb(ctx->rkey_enc, src, dst);
+ kernel_vector_end();
+ } else {
+ sm4_crypt_block(ctx->rkey_enc, dst, src);
+ }
+}
+
+static void riscv64_sm4_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (crypto_simd_usable()) {
+ kernel_vector_begin();
+ sm4_crypt_zvksed_zvkb(ctx->rkey_dec, src, dst);
+ kernel_vector_end();
+ } else {
+ sm4_crypt_block(ctx->rkey_dec, dst, src);
+ }
+}
+
+static struct crypto_alg riscv64_sm4_alg = {
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = SM4_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct sm4_ctx),
+ .cra_priority = 300,
+ .cra_name = "sm4",
+ .cra_driver_name = "sm4-riscv64-zvksed-zvkb",
+ .cra_cipher = {
+ .cia_min_keysize = SM4_KEY_SIZE,
+ .cia_max_keysize = SM4_KEY_SIZE,
+ .cia_setkey = riscv64_sm4_setkey,
+ .cia_encrypt = riscv64_sm4_encrypt,
+ .cia_decrypt = riscv64_sm4_decrypt,
+ },
+ .cra_module = THIS_MODULE,
+};
+
+static int __init riscv64_sm4_mod_init(void)
+{
+ if (riscv_isa_extension_available(NULL, ZVKSED) &&
+ riscv_isa_extension_available(NULL, ZVKB) &&
+ riscv_vector_vlen() >= 128)
+ return crypto_register_alg(&riscv64_sm4_alg);
+
+ return -ENODEV;
+}
+
+static void __exit riscv64_sm4_mod_exit(void)
+{
+ crypto_unregister_alg(&riscv64_sm4_alg);
+}
+
+module_init(riscv64_sm4_mod_init);
+module_exit(riscv64_sm4_mod_exit);
+
+MODULE_DESCRIPTION("SM4 (RISC-V accelerated)");
+MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@vrull.eu>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CRYPTO("sm4");