crypt: chacha20-p10 - Glue code for optmized Chacha20 implementation for ppc64le
Signed-off-by: Danny Tsen <dtsen@linux.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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arch/powerpc/crypto/chacha-p10-glue.c
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arch/powerpc/crypto/chacha-p10-glue.c
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PowerPC P10 (ppc64le) accelerated ChaCha and XChaCha stream ciphers,
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* including ChaCha20 (RFC7539)
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*
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* Copyright 2023- IBM Corp. All rights reserved.
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/chacha.h>
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#include <crypto/internal/simd.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/cpufeature.h>
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#include <linux/sizes.h>
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#include <asm/simd.h>
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#include <asm/switch_to.h>
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asmlinkage void chacha_p10le_8x(u32 *state, u8 *dst, const u8 *src,
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unsigned int len, int nrounds);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_p10);
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static void vsx_begin(void)
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{
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preempt_disable();
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enable_kernel_vsx();
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}
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static void vsx_end(void)
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{
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disable_kernel_vsx();
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preempt_enable();
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}
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static void chacha_p10_do_8x(u32 *state, u8 *dst, const u8 *src,
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unsigned int bytes, int nrounds)
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{
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unsigned int l = bytes & ~0x0FF;
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if (l > 0) {
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chacha_p10le_8x(state, dst, src, l, nrounds);
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bytes -= l;
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src += l;
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dst += l;
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state[12] += l / CHACHA_BLOCK_SIZE;
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}
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if (bytes > 0)
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chacha_crypt_generic(state, dst, src, bytes, nrounds);
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}
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void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds)
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{
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hchacha_block_generic(state, stream, nrounds);
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}
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EXPORT_SYMBOL(hchacha_block_arch);
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void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv)
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{
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chacha_init_generic(state, key, iv);
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}
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EXPORT_SYMBOL(chacha_init_arch);
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void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, unsigned int bytes,
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int nrounds)
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{
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if (!static_branch_likely(&have_p10) || bytes <= CHACHA_BLOCK_SIZE ||
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!crypto_simd_usable())
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return chacha_crypt_generic(state, dst, src, bytes, nrounds);
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do {
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unsigned int todo = min_t(unsigned int, bytes, SZ_4K);
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vsx_begin();
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chacha_p10_do_8x(state, dst, src, todo, nrounds);
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vsx_end();
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bytes -= todo;
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src += todo;
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dst += todo;
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} while (bytes);
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}
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EXPORT_SYMBOL(chacha_crypt_arch);
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static int chacha_p10_stream_xor(struct skcipher_request *req,
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const struct chacha_ctx *ctx, const u8 *iv)
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{
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struct skcipher_walk walk;
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u32 state[16];
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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if (err)
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return err;
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chacha_init_generic(state, ctx->key, iv);
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while (walk.nbytes > 0) {
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unsigned int nbytes = walk.nbytes;
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if (nbytes < walk.total)
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nbytes = rounddown(nbytes, walk.stride);
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if (!crypto_simd_usable()) {
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chacha_crypt_generic(state, walk.dst.virt.addr,
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walk.src.virt.addr, nbytes,
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ctx->nrounds);
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} else {
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vsx_begin();
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chacha_p10_do_8x(state, walk.dst.virt.addr,
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walk.src.virt.addr, nbytes, ctx->nrounds);
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vsx_end();
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}
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err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
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if (err)
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break;
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}
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return err;
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}
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static int chacha_p10(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
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return chacha_p10_stream_xor(req, ctx, req->iv);
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}
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static int xchacha_p10(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
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struct chacha_ctx subctx;
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u32 state[16];
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u8 real_iv[16];
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chacha_init_generic(state, ctx->key, req->iv);
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hchacha_block_arch(state, subctx.key, ctx->nrounds);
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subctx.nrounds = ctx->nrounds;
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memcpy(&real_iv[0], req->iv + 24, 8);
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memcpy(&real_iv[8], req->iv + 16, 8);
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return chacha_p10_stream_xor(req, &subctx, real_iv);
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}
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static struct skcipher_alg algs[] = {
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{
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.base.cra_name = "chacha20",
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.base.cra_driver_name = "chacha20-p10",
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.base.cra_priority = 300,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct chacha_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CHACHA_KEY_SIZE,
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.max_keysize = CHACHA_KEY_SIZE,
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.ivsize = CHACHA_IV_SIZE,
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.chunksize = CHACHA_BLOCK_SIZE,
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.setkey = chacha20_setkey,
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.encrypt = chacha_p10,
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.decrypt = chacha_p10,
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}, {
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.base.cra_name = "xchacha20",
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.base.cra_driver_name = "xchacha20-p10",
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.base.cra_priority = 300,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct chacha_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CHACHA_KEY_SIZE,
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.max_keysize = CHACHA_KEY_SIZE,
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.ivsize = XCHACHA_IV_SIZE,
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.chunksize = CHACHA_BLOCK_SIZE,
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.setkey = chacha20_setkey,
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.encrypt = xchacha_p10,
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.decrypt = xchacha_p10,
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}, {
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.base.cra_name = "xchacha12",
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.base.cra_driver_name = "xchacha12-p10",
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.base.cra_priority = 300,
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.base.cra_blocksize = 1,
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.base.cra_ctxsize = sizeof(struct chacha_ctx),
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.base.cra_module = THIS_MODULE,
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.min_keysize = CHACHA_KEY_SIZE,
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.max_keysize = CHACHA_KEY_SIZE,
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.ivsize = XCHACHA_IV_SIZE,
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.chunksize = CHACHA_BLOCK_SIZE,
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.setkey = chacha12_setkey,
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.encrypt = xchacha_p10,
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.decrypt = xchacha_p10,
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}
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};
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static int __init chacha_p10_init(void)
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{
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static_branch_enable(&have_p10);
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return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
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}
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static void __exit chacha_p10_exit(void)
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{
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crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
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}
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module_cpu_feature_match(PPC_MODULE_FEATURE_P10, chacha_p10_init);
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module_exit(chacha_p10_exit);
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MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (P10 accelerated)");
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MODULE_AUTHOR("Danny Tsen <dtsen@linux.ibm.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_CRYPTO("chacha20");
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MODULE_ALIAS_CRYPTO("chacha20-p10");
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MODULE_ALIAS_CRYPTO("xchacha20");
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MODULE_ALIAS_CRYPTO("xchacha20-p10");
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MODULE_ALIAS_CRYPTO("xchacha12");
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MODULE_ALIAS_CRYPTO("xchacha12-p10");
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