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Diffstat (limited to '')
-rw-r--r-- | arch/arm64/crypto/sm4-ce-cipher-glue.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/arch/arm64/crypto/sm4-ce-cipher-glue.c b/arch/arm64/crypto/sm4-ce-cipher-glue.c new file mode 100644 index 000000000..76a34ef4a --- /dev/null +++ b/arch/arm64/crypto/sm4-ce-cipher-glue.c @@ -0,0 +1,82 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <asm/neon.h> +#include <asm/simd.h> +#include <crypto/sm4.h> +#include <crypto/internal/simd.h> +#include <linux/module.h> +#include <linux/cpufeature.h> +#include <linux/crypto.h> +#include <linux/types.h> + +MODULE_ALIAS_CRYPTO("sm4"); +MODULE_ALIAS_CRYPTO("sm4-ce"); +MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions"); +MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); +MODULE_LICENSE("GPL v2"); + +asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in); + +static int sm4_ce_setkey(struct crypto_tfm *tfm, const u8 *key, + unsigned int key_len) +{ + struct sm4_ctx *ctx = crypto_tfm_ctx(tfm); + + return sm4_expandkey(ctx, key, key_len); +} + +static void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) +{ + const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm); + + if (!crypto_simd_usable()) { + sm4_crypt_block(ctx->rkey_enc, out, in); + } else { + kernel_neon_begin(); + sm4_ce_do_crypt(ctx->rkey_enc, out, in); + kernel_neon_end(); + } +} + +static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) +{ + const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm); + + if (!crypto_simd_usable()) { + sm4_crypt_block(ctx->rkey_dec, out, in); + } else { + kernel_neon_begin(); + sm4_ce_do_crypt(ctx->rkey_dec, out, in); + kernel_neon_end(); + } +} + +static struct crypto_alg sm4_ce_alg = { + .cra_name = "sm4", + .cra_driver_name = "sm4-ce", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_CIPHER, + .cra_blocksize = SM4_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct sm4_ctx), + .cra_module = THIS_MODULE, + .cra_u.cipher = { + .cia_min_keysize = SM4_KEY_SIZE, + .cia_max_keysize = SM4_KEY_SIZE, + .cia_setkey = sm4_ce_setkey, + .cia_encrypt = sm4_ce_encrypt, + .cia_decrypt = sm4_ce_decrypt + } +}; + +static int __init sm4_ce_mod_init(void) +{ + return crypto_register_alg(&sm4_ce_alg); +} + +static void __exit sm4_ce_mod_fini(void) +{ + crypto_unregister_alg(&sm4_ce_alg); +} + +module_cpu_feature_match(SM4, sm4_ce_mod_init); +module_exit(sm4_ce_mod_fini); |