// SPDX-License-Identifier: GPL-2.0
/*
- * ARM NEON accelerated ChaCha and XChaCha stream ciphers,
- * including ChaCha20 (RFC7539)
+ * ChaCha and HChaCha functions (ARM optimized)
*
* Copyright (C) 2016-2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
* Copyright (C) 2015 Martin Willi
*/
-#include <crypto/algapi.h>
-#include <crypto/internal/chacha.h>
+#include <crypto/chacha.h>
#include <crypto/internal/simd.h>
-#include <crypto/internal/skcipher.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>
}
EXPORT_SYMBOL(chacha_crypt_arch);
-static int chacha_stream_xor(struct skcipher_request *req,
- const struct chacha_ctx *ctx, const u8 *iv,
- bool neon)
-{
- struct skcipher_walk walk;
- u32 state[16];
- int err;
-
- err = skcipher_walk_virt(&walk, req, false);
-
- chacha_init(state, ctx->key, iv);
-
- while (walk.nbytes > 0) {
- unsigned int nbytes = walk.nbytes;
-
- if (nbytes < walk.total)
- nbytes = round_down(nbytes, walk.stride);
-
- if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon) {
- chacha_doarm(walk.dst.virt.addr, walk.src.virt.addr,
- nbytes, state, ctx->nrounds);
- state[12] += DIV_ROUND_UP(nbytes, CHACHA_BLOCK_SIZE);
- } else {
- kernel_neon_begin();
- chacha_doneon(state, walk.dst.virt.addr,
- walk.src.virt.addr, nbytes, ctx->nrounds);
- kernel_neon_end();
- }
- err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
- }
-
- return err;
-}
-
-static int do_chacha(struct skcipher_request *req, bool neon)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
-
- return chacha_stream_xor(req, ctx, req->iv, neon);
-}
-
-static int chacha_arm(struct skcipher_request *req)
-{
- return do_chacha(req, false);
-}
-
-static int chacha_neon(struct skcipher_request *req)
-{
- return do_chacha(req, neon_usable());
-}
-
-static int do_xchacha(struct skcipher_request *req, bool neon)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct chacha_ctx subctx;
- u32 state[16];
- u8 real_iv[16];
-
- chacha_init(state, ctx->key, req->iv);
-
- if (!IS_ENABLED(CONFIG_KERNEL_MODE_NEON) || !neon) {
- hchacha_block_arm(state, subctx.key, ctx->nrounds);
- } else {
- kernel_neon_begin();
- hchacha_block_neon(state, subctx.key, ctx->nrounds);
- kernel_neon_end();
- }
- subctx.nrounds = ctx->nrounds;
-
- memcpy(&real_iv[0], req->iv + 24, 8);
- memcpy(&real_iv[8], req->iv + 16, 8);
- return chacha_stream_xor(req, &subctx, real_iv, neon);
-}
-
-static int xchacha_arm(struct skcipher_request *req)
-{
- return do_xchacha(req, false);
-}
-
-static int xchacha_neon(struct skcipher_request *req)
-{
- return do_xchacha(req, neon_usable());
-}
-
-static struct skcipher_alg arm_algs[] = {
- {
- .base.cra_name = "chacha20",
- .base.cra_driver_name = "chacha20-arm",
- .base.cra_priority = 200,
- .base.cra_blocksize = 1,
- .base.cra_ctxsize = sizeof(struct chacha_ctx),
- .base.cra_module = THIS_MODULE,
-
- .min_keysize = CHACHA_KEY_SIZE,
- .max_keysize = CHACHA_KEY_SIZE,
- .ivsize = CHACHA_IV_SIZE,
- .chunksize = CHACHA_BLOCK_SIZE,
- .setkey = chacha20_setkey,
- .encrypt = chacha_arm,
- .decrypt = chacha_arm,
- }, {
- .base.cra_name = "xchacha20",
- .base.cra_driver_name = "xchacha20-arm",
- .base.cra_priority = 200,
- .base.cra_blocksize = 1,
- .base.cra_ctxsize = sizeof(struct chacha_ctx),
- .base.cra_module = THIS_MODULE,
-
- .min_keysize = CHACHA_KEY_SIZE,
- .max_keysize = CHACHA_KEY_SIZE,
- .ivsize = XCHACHA_IV_SIZE,
- .chunksize = CHACHA_BLOCK_SIZE,
- .setkey = chacha20_setkey,
- .encrypt = xchacha_arm,
- .decrypt = xchacha_arm,
- }, {
- .base.cra_name = "xchacha12",
- .base.cra_driver_name = "xchacha12-arm",
- .base.cra_priority = 200,
- .base.cra_blocksize = 1,
- .base.cra_ctxsize = sizeof(struct chacha_ctx),
- .base.cra_module = THIS_MODULE,
-
- .min_keysize = CHACHA_KEY_SIZE,
- .max_keysize = CHACHA_KEY_SIZE,
- .ivsize = XCHACHA_IV_SIZE,
- .chunksize = CHACHA_BLOCK_SIZE,
- .setkey = chacha12_setkey,
- .encrypt = xchacha_arm,
- .decrypt = xchacha_arm,
- },
-};
-
-static struct skcipher_alg neon_algs[] = {
- {
- .base.cra_name = "chacha20",
- .base.cra_driver_name = "chacha20-neon",
- .base.cra_priority = 300,
- .base.cra_blocksize = 1,
- .base.cra_ctxsize = sizeof(struct chacha_ctx),
- .base.cra_module = THIS_MODULE,
-
- .min_keysize = CHACHA_KEY_SIZE,
- .max_keysize = CHACHA_KEY_SIZE,
- .ivsize = CHACHA_IV_SIZE,
- .chunksize = CHACHA_BLOCK_SIZE,
- .walksize = 4 * CHACHA_BLOCK_SIZE,
- .setkey = chacha20_setkey,
- .encrypt = chacha_neon,
- .decrypt = chacha_neon,
- }, {
- .base.cra_name = "xchacha20",
- .base.cra_driver_name = "xchacha20-neon",
- .base.cra_priority = 300,
- .base.cra_blocksize = 1,
- .base.cra_ctxsize = sizeof(struct chacha_ctx),
- .base.cra_module = THIS_MODULE,
-
- .min_keysize = CHACHA_KEY_SIZE,
- .max_keysize = CHACHA_KEY_SIZE,
- .ivsize = XCHACHA_IV_SIZE,
- .chunksize = CHACHA_BLOCK_SIZE,
- .walksize = 4 * CHACHA_BLOCK_SIZE,
- .setkey = chacha20_setkey,
- .encrypt = xchacha_neon,
- .decrypt = xchacha_neon,
- }, {
- .base.cra_name = "xchacha12",
- .base.cra_driver_name = "xchacha12-neon",
- .base.cra_priority = 300,
- .base.cra_blocksize = 1,
- .base.cra_ctxsize = sizeof(struct chacha_ctx),
- .base.cra_module = THIS_MODULE,
-
- .min_keysize = CHACHA_KEY_SIZE,
- .max_keysize = CHACHA_KEY_SIZE,
- .ivsize = XCHACHA_IV_SIZE,
- .chunksize = CHACHA_BLOCK_SIZE,
- .walksize = 4 * CHACHA_BLOCK_SIZE,
- .setkey = chacha12_setkey,
- .encrypt = xchacha_neon,
- .decrypt = xchacha_neon,
- }
-};
-
bool chacha_is_arch_optimized(void)
{
/* We always can use at least the ARM scalar implementation. */
}
EXPORT_SYMBOL(chacha_is_arch_optimized);
-static int __init chacha_simd_mod_init(void)
+static int __init chacha_arm_mod_init(void)
{
- int err = 0;
-
- if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) {
- err = crypto_register_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
- if (err)
- return err;
- }
-
if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_NEON)) {
- int i;
-
switch (read_cpuid_part()) {
case ARM_CPU_PART_CORTEX_A7:
case ARM_CPU_PART_CORTEX_A5:
* the NEON implementation but do incredibly with the
* scalar one and use less power.
*/
- for (i = 0; i < ARRAY_SIZE(neon_algs); i++)
- neon_algs[i].base.cra_priority = 0;
break;
default:
static_branch_enable(&use_neon);
}
-
- if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) {
- err = crypto_register_skciphers(neon_algs, ARRAY_SIZE(neon_algs));
- if (err)
- crypto_unregister_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
- }
}
- return err;
+ return 0;
}
+arch_initcall(chacha_arm_mod_init);
-static void __exit chacha_simd_mod_fini(void)
-{
- if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) {
- crypto_unregister_skciphers(arm_algs, ARRAY_SIZE(arm_algs));
- if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_NEON))
- crypto_unregister_skciphers(neon_algs, ARRAY_SIZE(neon_algs));
- }
-}
-
-arch_initcall(chacha_simd_mod_init);
-module_exit(chacha_simd_mod_fini);
-
-MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (scalar and NEON accelerated)");
+MODULE_DESCRIPTION("ChaCha and HChaCha functions (ARM optimized)");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
-MODULE_ALIAS_CRYPTO("chacha20");
-MODULE_ALIAS_CRYPTO("chacha20-arm");
-MODULE_ALIAS_CRYPTO("xchacha20");
-MODULE_ALIAS_CRYPTO("xchacha20-arm");
-MODULE_ALIAS_CRYPTO("xchacha12");
-MODULE_ALIAS_CRYPTO("xchacha12-arm");
-#ifdef CONFIG_KERNEL_MODE_NEON
-MODULE_ALIAS_CRYPTO("chacha20-neon");
-MODULE_ALIAS_CRYPTO("xchacha20-neon");
-MODULE_ALIAS_CRYPTO("xchacha12-neon");
-#endif
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