projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c70f4abe MW |
1 | /* |
| 2 | * Poly1305 authenticator algorithm, RFC7539, SIMD glue code | |
| 3 | * | |
| 4 | * Copyright (C) 2015 Martin Willi | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License as published by | |
| 8 | * the Free Software Foundation; either version 2 of the License, or | |
| 9 | * (at your option) any later version. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <crypto/algapi.h> | |
| 13 | #include <crypto/internal/hash.h> | |
| 14 | #include <crypto/poly1305.h> | |
| 15 | #include <linux/crypto.h> | |
| 16 | #include <linux/kernel.h> | |
| 17 | #include <linux/module.h> | |
| 18 | #include <asm/fpu/api.h> | |
| 19 | #include <asm/simd.h> | |
| 20 | ||
| 21 | asmlinkage void poly1305_block_sse2(u32 *h, const u8 *src, | |
| 22 | const u32 *r, unsigned int blocks); | |
| 23 | ||
| 24 | static unsigned int poly1305_simd_blocks(struct poly1305_desc_ctx *dctx, | |
| 25 | const u8 *src, unsigned int srclen) | |
| 26 | { | |
| 27 | unsigned int blocks, datalen; | |
| 28 | ||
| 29 | if (unlikely(!dctx->sset)) { | |
| 30 | datalen = crypto_poly1305_setdesckey(dctx, src, srclen); | |
| 31 | src += srclen - datalen; | |
| 32 | srclen = datalen; | |
| 33 | } | |
| 34 | ||
| 35 | if (srclen >= POLY1305_BLOCK_SIZE) { | |
| 36 | blocks = srclen / POLY1305_BLOCK_SIZE; | |
| 37 | poly1305_block_sse2(dctx->h, src, dctx->r, blocks); | |
| 38 | srclen -= POLY1305_BLOCK_SIZE * blocks; | |
| 39 | } | |
| 40 | return srclen; | |
| 41 | } | |
| 42 | ||
| 43 | static int poly1305_simd_update(struct shash_desc *desc, | |
| 44 | const u8 *src, unsigned int srclen) | |
| 45 | { | |
| 46 | struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc); | |
| 47 | unsigned int bytes; | |
| 48 | ||
| 49 | /* kernel_fpu_begin/end is costly, use fallback for small updates */ | |
| 50 | if (srclen <= 288 || !may_use_simd()) | |
| 51 | return crypto_poly1305_update(desc, src, srclen); | |
| 52 | ||
| 53 | kernel_fpu_begin(); | |
| 54 | ||
| 55 | if (unlikely(dctx->buflen)) { | |
| 56 | bytes = min(srclen, POLY1305_BLOCK_SIZE - dctx->buflen); | |
| 57 | memcpy(dctx->buf + dctx->buflen, src, bytes); | |
| 58 | src += bytes; | |
| 59 | srclen -= bytes; | |
| 60 | dctx->buflen += bytes; | |
| 61 | ||
| 62 | if (dctx->buflen == POLY1305_BLOCK_SIZE) { | |
| 63 | poly1305_simd_blocks(dctx, dctx->buf, | |
| 64 | POLY1305_BLOCK_SIZE); | |
| 65 | dctx->buflen = 0; | |
| 66 | } | |
| 67 | } | |
| 68 | ||
| 69 | if (likely(srclen >= POLY1305_BLOCK_SIZE)) { | |
| 70 | bytes = poly1305_simd_blocks(dctx, src, srclen); | |
| 71 | src += srclen - bytes; | |
| 72 | srclen = bytes; | |
| 73 | } | |
| 74 | ||
| 75 | kernel_fpu_end(); | |
| 76 | ||
| 77 | if (unlikely(srclen)) { | |
| 78 | dctx->buflen = srclen; | |
| 79 | memcpy(dctx->buf, src, srclen); | |
| 80 | } | |
| 81 | ||
| 82 | return 0; | |
| 83 | } | |
| 84 | ||
| 85 | static struct shash_alg alg = { | |
| 86 | .digestsize = POLY1305_DIGEST_SIZE, | |
| 87 | .init = crypto_poly1305_init, | |
| 88 | .update = poly1305_simd_update, | |
| 89 | .final = crypto_poly1305_final, | |
| 90 | .setkey = crypto_poly1305_setkey, | |
| 91 | .descsize = sizeof(struct poly1305_desc_ctx), | |
| 92 | .base = { | |
| 93 | .cra_name = "poly1305", | |
| 94 | .cra_driver_name = "poly1305-simd", | |
| 95 | .cra_priority = 300, | |
| 96 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
| 97 | .cra_alignmask = sizeof(u32) - 1, | |
| 98 | .cra_blocksize = POLY1305_BLOCK_SIZE, | |
| 99 | .cra_module = THIS_MODULE, | |
| 100 | }, | |
| 101 | }; | |
| 102 | ||
| 103 | static int __init poly1305_simd_mod_init(void) | |
| 104 | { | |
| 105 | if (!cpu_has_xmm2) | |
| 106 | return -ENODEV; | |
| 107 | ||
| 108 | return crypto_register_shash(&alg); | |
| 109 | } | |
| 110 | ||
| 111 | static void __exit poly1305_simd_mod_exit(void) | |
| 112 | { | |
| 113 | crypto_unregister_shash(&alg); | |
| 114 | } | |
| 115 | ||
| 116 | module_init(poly1305_simd_mod_init); | |
| 117 | module_exit(poly1305_simd_mod_exit); | |
| 118 | ||
| 119 | MODULE_LICENSE("GPL"); | |
| 120 | MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); | |
| 121 | MODULE_DESCRIPTION("Poly1305 authenticator"); | |
| 122 | MODULE_ALIAS_CRYPTO("poly1305"); | |
| 123 | MODULE_ALIAS_CRYPTO("poly1305-simd"); |