Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * MIPS accelerated ChaCha and XChaCha stream ciphers, |
| 4 | * including ChaCha20 (RFC7539) |
| 5 | * |
| 6 | * Copyright (C) 2019 Linaro, Ltd. <ard.biesheuvel@linaro.org> |
| 7 | */ |
| 8 | |
| 9 | #include <asm/byteorder.h> |
| 10 | #include <crypto/algapi.h> |
| 11 | #include <crypto/internal/chacha.h> |
| 12 | #include <crypto/internal/skcipher.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | |
| 16 | asmlinkage void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, |
| 17 | unsigned int bytes, int nrounds); |
| 18 | EXPORT_SYMBOL(chacha_crypt_arch); |
| 19 | |
| 20 | asmlinkage void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds); |
| 21 | EXPORT_SYMBOL(hchacha_block_arch); |
| 22 | |
| 23 | void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv) |
| 24 | { |
| 25 | chacha_init_generic(state, key, iv); |
| 26 | } |
| 27 | EXPORT_SYMBOL(chacha_init_arch); |
| 28 | |
| 29 | static int chacha_mips_stream_xor(struct skcipher_request *req, |
| 30 | const struct chacha_ctx *ctx, const u8 *iv) |
| 31 | { |
| 32 | struct skcipher_walk walk; |
| 33 | u32 state[16]; |
| 34 | int err; |
| 35 | |
| 36 | err = skcipher_walk_virt(&walk, req, false); |
| 37 | |
| 38 | chacha_init_generic(state, ctx->key, iv); |
| 39 | |
| 40 | while (walk.nbytes > 0) { |
| 41 | unsigned int nbytes = walk.nbytes; |
| 42 | |
| 43 | if (nbytes < walk.total) |
| 44 | nbytes = round_down(nbytes, walk.stride); |
| 45 | |
| 46 | chacha_crypt(state, walk.dst.virt.addr, walk.src.virt.addr, |
| 47 | nbytes, ctx->nrounds); |
| 48 | err = skcipher_walk_done(&walk, walk.nbytes - nbytes); |
| 49 | } |
| 50 | |
| 51 | return err; |
| 52 | } |
| 53 | |
| 54 | static int chacha_mips(struct skcipher_request *req) |
| 55 | { |
| 56 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| 57 | struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm); |
| 58 | |
| 59 | return chacha_mips_stream_xor(req, ctx, req->iv); |
| 60 | } |
| 61 | |
| 62 | static int xchacha_mips(struct skcipher_request *req) |
| 63 | { |
| 64 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| 65 | struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm); |
| 66 | struct chacha_ctx subctx; |
| 67 | u32 state[16]; |
| 68 | u8 real_iv[16]; |
| 69 | |
| 70 | chacha_init_generic(state, ctx->key, req->iv); |
| 71 | |
| 72 | hchacha_block(state, subctx.key, ctx->nrounds); |
| 73 | subctx.nrounds = ctx->nrounds; |
| 74 | |
| 75 | memcpy(&real_iv[0], req->iv + 24, 8); |
| 76 | memcpy(&real_iv[8], req->iv + 16, 8); |
| 77 | return chacha_mips_stream_xor(req, &subctx, real_iv); |
| 78 | } |
| 79 | |
| 80 | static struct skcipher_alg algs[] = { |
| 81 | { |
| 82 | .base.cra_name = "chacha20", |
| 83 | .base.cra_driver_name = "chacha20-mips", |
| 84 | .base.cra_priority = 200, |
| 85 | .base.cra_blocksize = 1, |
| 86 | .base.cra_ctxsize = sizeof(struct chacha_ctx), |
| 87 | .base.cra_module = THIS_MODULE, |
| 88 | |
| 89 | .min_keysize = CHACHA_KEY_SIZE, |
| 90 | .max_keysize = CHACHA_KEY_SIZE, |
| 91 | .ivsize = CHACHA_IV_SIZE, |
| 92 | .chunksize = CHACHA_BLOCK_SIZE, |
| 93 | .setkey = chacha20_setkey, |
| 94 | .encrypt = chacha_mips, |
| 95 | .decrypt = chacha_mips, |
| 96 | }, { |
| 97 | .base.cra_name = "xchacha20", |
| 98 | .base.cra_driver_name = "xchacha20-mips", |
| 99 | .base.cra_priority = 200, |
| 100 | .base.cra_blocksize = 1, |
| 101 | .base.cra_ctxsize = sizeof(struct chacha_ctx), |
| 102 | .base.cra_module = THIS_MODULE, |
| 103 | |
| 104 | .min_keysize = CHACHA_KEY_SIZE, |
| 105 | .max_keysize = CHACHA_KEY_SIZE, |
| 106 | .ivsize = XCHACHA_IV_SIZE, |
| 107 | .chunksize = CHACHA_BLOCK_SIZE, |
| 108 | .setkey = chacha20_setkey, |
| 109 | .encrypt = xchacha_mips, |
| 110 | .decrypt = xchacha_mips, |
| 111 | }, { |
| 112 | .base.cra_name = "xchacha12", |
| 113 | .base.cra_driver_name = "xchacha12-mips", |
| 114 | .base.cra_priority = 200, |
| 115 | .base.cra_blocksize = 1, |
| 116 | .base.cra_ctxsize = sizeof(struct chacha_ctx), |
| 117 | .base.cra_module = THIS_MODULE, |
| 118 | |
| 119 | .min_keysize = CHACHA_KEY_SIZE, |
| 120 | .max_keysize = CHACHA_KEY_SIZE, |
| 121 | .ivsize = XCHACHA_IV_SIZE, |
| 122 | .chunksize = CHACHA_BLOCK_SIZE, |
| 123 | .setkey = chacha12_setkey, |
| 124 | .encrypt = xchacha_mips, |
| 125 | .decrypt = xchacha_mips, |
| 126 | } |
| 127 | }; |
| 128 | |
| 129 | static int __init chacha_simd_mod_init(void) |
| 130 | { |
| 131 | return IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) ? |
| 132 | crypto_register_skciphers(algs, ARRAY_SIZE(algs)) : 0; |
| 133 | } |
| 134 | |
| 135 | static void __exit chacha_simd_mod_fini(void) |
| 136 | { |
| 137 | if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) |
| 138 | crypto_unregister_skciphers(algs, ARRAY_SIZE(algs)); |
| 139 | } |
| 140 | |
| 141 | module_init(chacha_simd_mod_init); |
| 142 | module_exit(chacha_simd_mod_fini); |
| 143 | |
| 144 | MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (MIPS accelerated)"); |
| 145 | MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); |
| 146 | MODULE_LICENSE("GPL v2"); |
| 147 | MODULE_ALIAS_CRYPTO("chacha20"); |
| 148 | MODULE_ALIAS_CRYPTO("chacha20-mips"); |
| 149 | MODULE_ALIAS_CRYPTO("xchacha20"); |
| 150 | MODULE_ALIAS_CRYPTO("xchacha20-mips"); |
| 151 | MODULE_ALIAS_CRYPTO("xchacha12"); |
| 152 | MODULE_ALIAS_CRYPTO("xchacha12-mips"); |