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-rw-r--r--arch/x86/crypto/aegis128-aesni-glue.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/arch/x86/crypto/aegis128-aesni-glue.c b/arch/x86/crypto/aegis128-aesni-glue.c
new file mode 100644
index 000000000000..f1adfba1a76e
--- /dev/null
+++ b/arch/x86/crypto/aegis128-aesni-glue.c
@@ -0,0 +1,287 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * The AEGIS-128 Authenticated-Encryption Algorithm
+ * Glue for AES-NI + SSE4.1 implementation
+ *
+ * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
+ * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
+ */
+
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
+#include <linux/module.h>
+#include <asm/fpu/api.h>
+#include <asm/cpu_device_id.h>
+
+#define AEGIS128_BLOCK_ALIGN 16
+#define AEGIS128_BLOCK_SIZE 16
+#define AEGIS128_NONCE_SIZE 16
+#define AEGIS128_STATE_BLOCKS 5
+#define AEGIS128_KEY_SIZE 16
+#define AEGIS128_MIN_AUTH_SIZE 8
+#define AEGIS128_MAX_AUTH_SIZE 16
+
+struct aegis_block {
+ u8 bytes[AEGIS128_BLOCK_SIZE] __aligned(AEGIS128_BLOCK_ALIGN);
+};
+
+struct aegis_state {
+ struct aegis_block blocks[AEGIS128_STATE_BLOCKS];
+};
+
+struct aegis_ctx {
+ struct aegis_block key;
+};
+
+asmlinkage void aegis128_aesni_init(struct aegis_state *state,
+ const struct aegis_block *key,
+ const u8 iv[AEGIS128_NONCE_SIZE]);
+
+asmlinkage void aegis128_aesni_ad(struct aegis_state *state, const u8 *data,
+ unsigned int len);
+
+asmlinkage void aegis128_aesni_enc(struct aegis_state *state, const u8 *src,
+ u8 *dst, unsigned int len);
+
+asmlinkage void aegis128_aesni_dec(struct aegis_state *state, const u8 *src,
+ u8 *dst, unsigned int len);
+
+asmlinkage void aegis128_aesni_enc_tail(struct aegis_state *state,
+ const u8 *src, u8 *dst,
+ unsigned int len);
+
+asmlinkage void aegis128_aesni_dec_tail(struct aegis_state *state,
+ const u8 *src, u8 *dst,
+ unsigned int len);
+
+asmlinkage void aegis128_aesni_final(struct aegis_state *state,
+ struct aegis_block *tag_xor,
+ unsigned int assoclen,
+ unsigned int cryptlen);
+
+static void crypto_aegis128_aesni_process_ad(
+ struct aegis_state *state, struct scatterlist *sg_src,
+ unsigned int assoclen)
+{
+ struct scatter_walk walk;
+ struct aegis_block buf;
+ unsigned int pos = 0;
+
+ scatterwalk_start(&walk, sg_src);
+ while (assoclen != 0) {
+ unsigned int size = scatterwalk_next(&walk, assoclen);
+ const u8 *src = walk.addr;
+ unsigned int left = size;
+
+ if (pos + size >= AEGIS128_BLOCK_SIZE) {
+ if (pos > 0) {
+ unsigned int fill = AEGIS128_BLOCK_SIZE - pos;
+ memcpy(buf.bytes + pos, src, fill);
+ aegis128_aesni_ad(state, buf.bytes,
+ AEGIS128_BLOCK_SIZE);
+ pos = 0;
+ left -= fill;
+ src += fill;
+ }
+
+ aegis128_aesni_ad(state, src,
+ left & ~(AEGIS128_BLOCK_SIZE - 1));
+ src += left & ~(AEGIS128_BLOCK_SIZE - 1);
+ left &= AEGIS128_BLOCK_SIZE - 1;
+ }
+
+ memcpy(buf.bytes + pos, src, left);
+ pos += left;
+ assoclen -= size;
+
+ scatterwalk_done_src(&walk, size);
+ }
+
+ if (pos > 0) {
+ memset(buf.bytes + pos, 0, AEGIS128_BLOCK_SIZE - pos);
+ aegis128_aesni_ad(state, buf.bytes, AEGIS128_BLOCK_SIZE);
+ }
+}
+
+static __always_inline int
+crypto_aegis128_aesni_process_crypt(struct aegis_state *state,
+ struct skcipher_walk *walk, bool enc)
+{
+ int err = 0;
+
+ while (walk->nbytes >= AEGIS128_BLOCK_SIZE) {
+ if (enc)
+ aegis128_aesni_enc(state, walk->src.virt.addr,
+ walk->dst.virt.addr,
+ round_down(walk->nbytes,
+ AEGIS128_BLOCK_SIZE));
+ else
+ aegis128_aesni_dec(state, walk->src.virt.addr,
+ walk->dst.virt.addr,
+ round_down(walk->nbytes,
+ AEGIS128_BLOCK_SIZE));
+ kernel_fpu_end();
+ err = skcipher_walk_done(walk,
+ walk->nbytes % AEGIS128_BLOCK_SIZE);
+ kernel_fpu_begin();
+ }
+
+ if (walk->nbytes) {
+ if (enc)
+ aegis128_aesni_enc_tail(state, walk->src.virt.addr,
+ walk->dst.virt.addr,
+ walk->nbytes);
+ else
+ aegis128_aesni_dec_tail(state, walk->src.virt.addr,
+ walk->dst.virt.addr,
+ walk->nbytes);
+ kernel_fpu_end();
+ err = skcipher_walk_done(walk, 0);
+ kernel_fpu_begin();
+ }
+ return err;
+}
+
+static struct aegis_ctx *crypto_aegis128_aesni_ctx(struct crypto_aead *aead)
+{
+ u8 *ctx = crypto_aead_ctx(aead);
+ ctx = PTR_ALIGN(ctx, __alignof__(struct aegis_ctx));
+ return (void *)ctx;
+}
+
+static int crypto_aegis128_aesni_setkey(struct crypto_aead *aead, const u8 *key,
+ unsigned int keylen)
+{
+ struct aegis_ctx *ctx = crypto_aegis128_aesni_ctx(aead);
+
+ if (keylen != AEGIS128_KEY_SIZE)
+ return -EINVAL;
+
+ memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
+
+ return 0;
+}
+
+static int crypto_aegis128_aesni_setauthsize(struct crypto_aead *tfm,
+ unsigned int authsize)
+{
+ if (authsize > AEGIS128_MAX_AUTH_SIZE)
+ return -EINVAL;
+ if (authsize < AEGIS128_MIN_AUTH_SIZE)
+ return -EINVAL;
+ return 0;
+}
+
+static __always_inline int
+crypto_aegis128_aesni_crypt(struct aead_request *req,
+ struct aegis_block *tag_xor,
+ unsigned int cryptlen, bool enc)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct aegis_ctx *ctx = crypto_aegis128_aesni_ctx(tfm);
+ struct skcipher_walk walk;
+ struct aegis_state state;
+ int err;
+
+ if (enc)
+ err = skcipher_walk_aead_encrypt(&walk, req, false);
+ else
+ err = skcipher_walk_aead_decrypt(&walk, req, false);
+ if (err)
+ return err;
+
+ kernel_fpu_begin();
+
+ aegis128_aesni_init(&state, &ctx->key, req->iv);
+ crypto_aegis128_aesni_process_ad(&state, req->src, req->assoclen);
+ err = crypto_aegis128_aesni_process_crypt(&state, &walk, enc);
+ if (err == 0)
+ aegis128_aesni_final(&state, tag_xor, req->assoclen, cryptlen);
+ kernel_fpu_end();
+ return err;
+}
+
+static int crypto_aegis128_aesni_encrypt(struct aead_request *req)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct aegis_block tag = {};
+ unsigned int authsize = crypto_aead_authsize(tfm);
+ unsigned int cryptlen = req->cryptlen;
+ int err;
+
+ err = crypto_aegis128_aesni_crypt(req, &tag, cryptlen, true);
+ if (err)
+ return err;
+
+ scatterwalk_map_and_copy(tag.bytes, req->dst,
+ req->assoclen + cryptlen, authsize, 1);
+ return 0;
+}
+
+static int crypto_aegis128_aesni_decrypt(struct aead_request *req)
+{
+ static const struct aegis_block zeros = {};
+
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct aegis_block tag;
+ unsigned int authsize = crypto_aead_authsize(tfm);
+ unsigned int cryptlen = req->cryptlen - authsize;
+ int err;
+
+ scatterwalk_map_and_copy(tag.bytes, req->src,
+ req->assoclen + cryptlen, authsize, 0);
+
+ err = crypto_aegis128_aesni_crypt(req, &tag, cryptlen, false);
+ if (err)
+ return err;
+
+ return crypto_memneq(tag.bytes, zeros.bytes, authsize) ? -EBADMSG : 0;
+}
+
+static struct aead_alg crypto_aegis128_aesni_alg = {
+ .setkey = crypto_aegis128_aesni_setkey,
+ .setauthsize = crypto_aegis128_aesni_setauthsize,
+ .encrypt = crypto_aegis128_aesni_encrypt,
+ .decrypt = crypto_aegis128_aesni_decrypt,
+
+ .ivsize = AEGIS128_NONCE_SIZE,
+ .maxauthsize = AEGIS128_MAX_AUTH_SIZE,
+ .chunksize = AEGIS128_BLOCK_SIZE,
+
+ .base = {
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct aegis_ctx) +
+ __alignof__(struct aegis_ctx),
+ .cra_priority = 400,
+
+ .cra_name = "aegis128",
+ .cra_driver_name = "aegis128-aesni",
+
+ .cra_module = THIS_MODULE,
+ }
+};
+
+static int __init crypto_aegis128_aesni_module_init(void)
+{
+ if (!boot_cpu_has(X86_FEATURE_XMM4_1) ||
+ !boot_cpu_has(X86_FEATURE_AES) ||
+ !cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL))
+ return -ENODEV;
+
+ return crypto_register_aead(&crypto_aegis128_aesni_alg);
+}
+
+static void __exit crypto_aegis128_aesni_module_exit(void)
+{
+ crypto_unregister_aead(&crypto_aegis128_aesni_alg);
+}
+
+module_init(crypto_aegis128_aesni_module_init);
+module_exit(crypto_aegis128_aesni_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
+MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm -- AESNI+SSE4.1 implementation");
+MODULE_ALIAS_CRYPTO("aegis128");
+MODULE_ALIAS_CRYPTO("aegis128-aesni");
generated by cgit (git 2.34.1) at 2025-12-26 05:51:16 +0000