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152 lines
4.1 KiB
152 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* MIPS accelerated ChaCha and XChaCha stream ciphers, |
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* including ChaCha20 (RFC7539) |
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* |
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* Copyright (C) 2019 Linaro, Ltd. <[email protected]> |
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*/ |
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#include <asm/byteorder.h> |
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#include <crypto/algapi.h> |
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#include <crypto/internal/chacha.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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asmlinkage void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, |
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unsigned int bytes, int nrounds); |
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EXPORT_SYMBOL(chacha_crypt_arch); |
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asmlinkage void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds); |
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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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static int chacha_mips_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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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 = round_down(nbytes, walk.stride); |
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chacha_crypt(state, walk.dst.virt.addr, walk.src.virt.addr, |
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nbytes, ctx->nrounds); |
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err = skcipher_walk_done(&walk, walk.nbytes - nbytes); |
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} |
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return err; |
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} |
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static int chacha_mips(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_mips_stream_xor(req, ctx, req->iv); |
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} |
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static int xchacha_mips(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(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_mips_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-mips", |
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.base.cra_priority = 200, |
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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_mips, |
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.decrypt = chacha_mips, |
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}, { |
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.base.cra_name = "xchacha20", |
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.base.cra_driver_name = "xchacha20-mips", |
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.base.cra_priority = 200, |
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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_mips, |
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.decrypt = xchacha_mips, |
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}, { |
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.base.cra_name = "xchacha12", |
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.base.cra_driver_name = "xchacha12-mips", |
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.base.cra_priority = 200, |
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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_mips, |
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.decrypt = xchacha_mips, |
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} |
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}; |
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static int __init chacha_simd_mod_init(void) |
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{ |
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return IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) ? |
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crypto_register_skciphers(algs, ARRAY_SIZE(algs)) : 0; |
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} |
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static void __exit chacha_simd_mod_fini(void) |
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{ |
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if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) |
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crypto_unregister_skciphers(algs, ARRAY_SIZE(algs)); |
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} |
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module_init(chacha_simd_mod_init); |
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module_exit(chacha_simd_mod_fini); |
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MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (MIPS accelerated)"); |
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MODULE_AUTHOR("Ard Biesheuvel <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS_CRYPTO("chacha20"); |
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MODULE_ALIAS_CRYPTO("chacha20-mips"); |
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MODULE_ALIAS_CRYPTO("xchacha20"); |
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MODULE_ALIAS_CRYPTO("xchacha20-mips"); |
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MODULE_ALIAS_CRYPTO("xchacha12"); |
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MODULE_ALIAS_CRYPTO("xchacha12-mips");
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