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Diffstat (limited to 'arch/x86/crypto/chacha20_glue.c')
-rw-r--r--arch/x86/crypto/chacha20_glue.c146
1 files changed, 0 insertions, 146 deletions
diff --git a/arch/x86/crypto/chacha20_glue.c b/arch/x86/crypto/chacha20_glue.c
deleted file mode 100644
index dce7c5d39c2f..000000000000
--- a/arch/x86/crypto/chacha20_glue.c
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, SIMD glue code
- *
- * Copyright (C) 2015 Martin Willi
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <crypto/algapi.h>
-#include <crypto/chacha20.h>
-#include <crypto/internal/skcipher.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <asm/fpu/api.h>
-#include <asm/simd.h>
-
-#define CHACHA20_STATE_ALIGN 16
-
-asmlinkage void chacha20_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src);
-asmlinkage void chacha20_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src);
-#ifdef CONFIG_AS_AVX2
-asmlinkage void chacha20_8block_xor_avx2(u32 *state, u8 *dst, const u8 *src);
-static bool chacha20_use_avx2;
-#endif
-
-static void chacha20_dosimd(u32 *state, u8 *dst, const u8 *src,
- unsigned int bytes)
-{
- u8 buf[CHACHA20_BLOCK_SIZE];
-
-#ifdef CONFIG_AS_AVX2
- if (chacha20_use_avx2) {
- while (bytes >= CHACHA20_BLOCK_SIZE * 8) {
- chacha20_8block_xor_avx2(state, dst, src);
- bytes -= CHACHA20_BLOCK_SIZE * 8;
- src += CHACHA20_BLOCK_SIZE * 8;
- dst += CHACHA20_BLOCK_SIZE * 8;
- state[12] += 8;
- }
- }
-#endif
- while (bytes >= CHACHA20_BLOCK_SIZE * 4) {
- chacha20_4block_xor_ssse3(state, dst, src);
- bytes -= CHACHA20_BLOCK_SIZE * 4;
- src += CHACHA20_BLOCK_SIZE * 4;
- dst += CHACHA20_BLOCK_SIZE * 4;
- state[12] += 4;
- }
- while (bytes >= CHACHA20_BLOCK_SIZE) {
- chacha20_block_xor_ssse3(state, dst, src);
- bytes -= CHACHA20_BLOCK_SIZE;
- src += CHACHA20_BLOCK_SIZE;
- dst += CHACHA20_BLOCK_SIZE;
- state[12]++;
- }
- if (bytes) {
- memcpy(buf, src, bytes);
- chacha20_block_xor_ssse3(state, buf, buf);
- memcpy(dst, buf, bytes);
- }
-}
-
-static int chacha20_simd(struct skcipher_request *req)
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct chacha20_ctx *ctx = crypto_skcipher_ctx(tfm);
- u32 *state, state_buf[16 + 2] __aligned(8);
- struct skcipher_walk walk;
- int err;
-
- BUILD_BUG_ON(CHACHA20_STATE_ALIGN != 16);
- state = PTR_ALIGN(state_buf + 0, CHACHA20_STATE_ALIGN);
-
- if (req->cryptlen <= CHACHA20_BLOCK_SIZE || !may_use_simd())
- return crypto_chacha20_crypt(req);
-
- err = skcipher_walk_virt(&walk, req, true);
-
- crypto_chacha20_init(state, ctx, walk.iv);
-
- kernel_fpu_begin();
-
- while (walk.nbytes >= CHACHA20_BLOCK_SIZE) {
- chacha20_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr,
- rounddown(walk.nbytes, CHACHA20_BLOCK_SIZE));
- err = skcipher_walk_done(&walk,
- walk.nbytes % CHACHA20_BLOCK_SIZE);
- }
-
- if (walk.nbytes) {
- chacha20_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr,
- walk.nbytes);
- err = skcipher_walk_done(&walk, 0);
- }
-
- kernel_fpu_end();
-
- return err;
-}
-
-static struct skcipher_alg alg = {
- .base.cra_name = "chacha20",
- .base.cra_driver_name = "chacha20-simd",
- .base.cra_priority = 300,
- .base.cra_blocksize = 1,
- .base.cra_ctxsize = sizeof(struct chacha20_ctx),
- .base.cra_module = THIS_MODULE,
-
- .min_keysize = CHACHA20_KEY_SIZE,
- .max_keysize = CHACHA20_KEY_SIZE,
- .ivsize = CHACHA20_IV_SIZE,
- .chunksize = CHACHA20_BLOCK_SIZE,
- .setkey = crypto_chacha20_setkey,
- .encrypt = chacha20_simd,
- .decrypt = chacha20_simd,
-};
-
-static int __init chacha20_simd_mod_init(void)
-{
- if (!boot_cpu_has(X86_FEATURE_SSSE3))
- return -ENODEV;
-
-#ifdef CONFIG_AS_AVX2
- chacha20_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
- boot_cpu_has(X86_FEATURE_AVX2) &&
- cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
-#endif
- return crypto_register_skcipher(&alg);
-}
-
-static void __exit chacha20_simd_mod_fini(void)
-{
- crypto_unregister_skcipher(&alg);
-}
-
-module_init(chacha20_simd_mod_init);
-module_exit(chacha20_simd_mod_fini);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
-MODULE_DESCRIPTION("chacha20 cipher algorithm, SIMD accelerated");
-MODULE_ALIAS_CRYPTO("chacha20");
-MODULE_ALIAS_CRYPTO("chacha20-simd");