Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 1 | /* |
| 2 | * ChaCha20-Poly1305 AEAD, RFC7539 |
| 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/internal/aead.h> |
| 13 | #include <crypto/internal/hash.h> |
| 14 | #include <crypto/internal/skcipher.h> |
| 15 | #include <crypto/scatterwalk.h> |
Martin Willi | 31d7247 | 2015-07-16 19:14:00 +0200 | [diff] [blame] | 16 | #include <crypto/chacha20.h> |
Martin Willi | 2546f81 | 2015-07-16 19:14:05 +0200 | [diff] [blame] | 17 | #include <crypto/poly1305.h> |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 18 | #include <linux/err.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
| 22 | |
| 23 | #include "internal.h" |
| 24 | |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 25 | #define CHACHAPOLY_IV_SIZE 12 |
| 26 | |
| 27 | struct chachapoly_instance_ctx { |
| 28 | struct crypto_skcipher_spawn chacha; |
| 29 | struct crypto_ahash_spawn poly; |
| 30 | unsigned int saltlen; |
| 31 | }; |
| 32 | |
| 33 | struct chachapoly_ctx { |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 34 | struct crypto_skcipher *chacha; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 35 | struct crypto_ahash *poly; |
| 36 | /* key bytes we use for the ChaCha20 IV */ |
| 37 | unsigned int saltlen; |
| 38 | u8 salt[]; |
| 39 | }; |
| 40 | |
| 41 | struct poly_req { |
| 42 | /* zero byte padding for AD/ciphertext, as needed */ |
| 43 | u8 pad[POLY1305_BLOCK_SIZE]; |
| 44 | /* tail data with AD/ciphertext lengths */ |
| 45 | struct { |
| 46 | __le64 assoclen; |
| 47 | __le64 cryptlen; |
| 48 | } tail; |
| 49 | struct scatterlist src[1]; |
| 50 | struct ahash_request req; /* must be last member */ |
| 51 | }; |
| 52 | |
| 53 | struct chacha_req { |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 54 | u8 iv[CHACHA20_IV_SIZE]; |
| 55 | struct scatterlist src[1]; |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 56 | struct skcipher_request req; /* must be last member */ |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 57 | }; |
| 58 | |
| 59 | struct chachapoly_req_ctx { |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 60 | struct scatterlist src[2]; |
| 61 | struct scatterlist dst[2]; |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 62 | /* the key we generate for Poly1305 using Chacha20 */ |
| 63 | u8 key[POLY1305_KEY_SIZE]; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 64 | /* calculated Poly1305 tag */ |
| 65 | u8 tag[POLY1305_DIGEST_SIZE]; |
| 66 | /* length of data to en/decrypt, without ICV */ |
| 67 | unsigned int cryptlen; |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 68 | /* Actual AD, excluding IV */ |
| 69 | unsigned int assoclen; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 70 | union { |
| 71 | struct poly_req poly; |
| 72 | struct chacha_req chacha; |
| 73 | } u; |
| 74 | }; |
| 75 | |
| 76 | static inline void async_done_continue(struct aead_request *req, int err, |
| 77 | int (*cont)(struct aead_request *)) |
| 78 | { |
| 79 | if (!err) |
| 80 | err = cont(req); |
| 81 | |
| 82 | if (err != -EINPROGRESS && err != -EBUSY) |
| 83 | aead_request_complete(req, err); |
| 84 | } |
| 85 | |
| 86 | static void chacha_iv(u8 *iv, struct aead_request *req, u32 icb) |
| 87 | { |
| 88 | struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 89 | __le32 leicb = cpu_to_le32(icb); |
| 90 | |
| 91 | memcpy(iv, &leicb, sizeof(leicb)); |
| 92 | memcpy(iv + sizeof(leicb), ctx->salt, ctx->saltlen); |
| 93 | memcpy(iv + sizeof(leicb) + ctx->saltlen, req->iv, |
| 94 | CHACHA20_IV_SIZE - sizeof(leicb) - ctx->saltlen); |
| 95 | } |
| 96 | |
| 97 | static int poly_verify_tag(struct aead_request *req) |
| 98 | { |
| 99 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 100 | u8 tag[sizeof(rctx->tag)]; |
| 101 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 102 | scatterwalk_map_and_copy(tag, req->src, |
| 103 | req->assoclen + rctx->cryptlen, |
| 104 | sizeof(tag), 0); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 105 | if (crypto_memneq(tag, rctx->tag, sizeof(tag))) |
| 106 | return -EBADMSG; |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static int poly_copy_tag(struct aead_request *req) |
| 111 | { |
| 112 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 113 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 114 | scatterwalk_map_and_copy(rctx->tag, req->dst, |
| 115 | req->assoclen + rctx->cryptlen, |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 116 | sizeof(rctx->tag), 1); |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | static void chacha_decrypt_done(struct crypto_async_request *areq, int err) |
| 121 | { |
| 122 | async_done_continue(areq->data, err, poly_verify_tag); |
| 123 | } |
| 124 | |
| 125 | static int chacha_decrypt(struct aead_request *req) |
| 126 | { |
| 127 | struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 128 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 129 | struct chacha_req *creq = &rctx->u.chacha; |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 130 | struct scatterlist *src, *dst; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 131 | int err; |
| 132 | |
Jason A. Donenfeld | 161151d | 2015-12-06 02:51:38 +0100 | [diff] [blame] | 133 | if (rctx->cryptlen == 0) |
| 134 | goto skip; |
| 135 | |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 136 | chacha_iv(creq->iv, req, 1); |
| 137 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 138 | sg_init_table(rctx->src, 2); |
| 139 | src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen); |
| 140 | dst = src; |
| 141 | |
| 142 | if (req->src != req->dst) { |
| 143 | sg_init_table(rctx->dst, 2); |
| 144 | dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); |
| 145 | } |
| 146 | |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 147 | skcipher_request_set_callback(&creq->req, aead_request_flags(req), |
| 148 | chacha_decrypt_done, req); |
| 149 | skcipher_request_set_tfm(&creq->req, ctx->chacha); |
| 150 | skcipher_request_set_crypt(&creq->req, src, dst, |
| 151 | rctx->cryptlen, creq->iv); |
| 152 | err = crypto_skcipher_decrypt(&creq->req); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 153 | if (err) |
| 154 | return err; |
| 155 | |
Jason A. Donenfeld | 161151d | 2015-12-06 02:51:38 +0100 | [diff] [blame] | 156 | skip: |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 157 | return poly_verify_tag(req); |
| 158 | } |
| 159 | |
| 160 | static int poly_tail_continue(struct aead_request *req) |
| 161 | { |
| 162 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 163 | |
| 164 | if (rctx->cryptlen == req->cryptlen) /* encrypting */ |
| 165 | return poly_copy_tag(req); |
| 166 | |
| 167 | return chacha_decrypt(req); |
| 168 | } |
| 169 | |
| 170 | static void poly_tail_done(struct crypto_async_request *areq, int err) |
| 171 | { |
| 172 | async_done_continue(areq->data, err, poly_tail_continue); |
| 173 | } |
| 174 | |
| 175 | static int poly_tail(struct aead_request *req) |
| 176 | { |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 177 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| 178 | struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 179 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 180 | struct poly_req *preq = &rctx->u.poly; |
| 181 | __le64 len; |
| 182 | int err; |
| 183 | |
| 184 | sg_init_table(preq->src, 1); |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 185 | len = cpu_to_le64(rctx->assoclen); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 186 | memcpy(&preq->tail.assoclen, &len, sizeof(len)); |
| 187 | len = cpu_to_le64(rctx->cryptlen); |
| 188 | memcpy(&preq->tail.cryptlen, &len, sizeof(len)); |
| 189 | sg_set_buf(preq->src, &preq->tail, sizeof(preq->tail)); |
| 190 | |
| 191 | ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| 192 | poly_tail_done, req); |
| 193 | ahash_request_set_tfm(&preq->req, ctx->poly); |
| 194 | ahash_request_set_crypt(&preq->req, preq->src, |
| 195 | rctx->tag, sizeof(preq->tail)); |
| 196 | |
| 197 | err = crypto_ahash_finup(&preq->req); |
| 198 | if (err) |
| 199 | return err; |
| 200 | |
| 201 | return poly_tail_continue(req); |
| 202 | } |
| 203 | |
| 204 | static void poly_cipherpad_done(struct crypto_async_request *areq, int err) |
| 205 | { |
| 206 | async_done_continue(areq->data, err, poly_tail); |
| 207 | } |
| 208 | |
| 209 | static int poly_cipherpad(struct aead_request *req) |
| 210 | { |
| 211 | struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 212 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 213 | struct poly_req *preq = &rctx->u.poly; |
| 214 | unsigned int padlen, bs = POLY1305_BLOCK_SIZE; |
| 215 | int err; |
| 216 | |
| 217 | padlen = (bs - (rctx->cryptlen % bs)) % bs; |
| 218 | memset(preq->pad, 0, sizeof(preq->pad)); |
| 219 | sg_init_table(preq->src, 1); |
| 220 | sg_set_buf(preq->src, &preq->pad, padlen); |
| 221 | |
| 222 | ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| 223 | poly_cipherpad_done, req); |
| 224 | ahash_request_set_tfm(&preq->req, ctx->poly); |
| 225 | ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); |
| 226 | |
| 227 | err = crypto_ahash_update(&preq->req); |
| 228 | if (err) |
| 229 | return err; |
| 230 | |
| 231 | return poly_tail(req); |
| 232 | } |
| 233 | |
| 234 | static void poly_cipher_done(struct crypto_async_request *areq, int err) |
| 235 | { |
| 236 | async_done_continue(areq->data, err, poly_cipherpad); |
| 237 | } |
| 238 | |
| 239 | static int poly_cipher(struct aead_request *req) |
| 240 | { |
| 241 | struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 242 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 243 | struct poly_req *preq = &rctx->u.poly; |
| 244 | struct scatterlist *crypt = req->src; |
| 245 | int err; |
| 246 | |
| 247 | if (rctx->cryptlen == req->cryptlen) /* encrypting */ |
| 248 | crypt = req->dst; |
| 249 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 250 | sg_init_table(rctx->src, 2); |
| 251 | crypt = scatterwalk_ffwd(rctx->src, crypt, req->assoclen); |
| 252 | |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 253 | ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| 254 | poly_cipher_done, req); |
| 255 | ahash_request_set_tfm(&preq->req, ctx->poly); |
| 256 | ahash_request_set_crypt(&preq->req, crypt, NULL, rctx->cryptlen); |
| 257 | |
| 258 | err = crypto_ahash_update(&preq->req); |
| 259 | if (err) |
| 260 | return err; |
| 261 | |
| 262 | return poly_cipherpad(req); |
| 263 | } |
| 264 | |
| 265 | static void poly_adpad_done(struct crypto_async_request *areq, int err) |
| 266 | { |
| 267 | async_done_continue(areq->data, err, poly_cipher); |
| 268 | } |
| 269 | |
| 270 | static int poly_adpad(struct aead_request *req) |
| 271 | { |
| 272 | struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 273 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 274 | struct poly_req *preq = &rctx->u.poly; |
| 275 | unsigned int padlen, bs = POLY1305_BLOCK_SIZE; |
| 276 | int err; |
| 277 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 278 | padlen = (bs - (rctx->assoclen % bs)) % bs; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 279 | memset(preq->pad, 0, sizeof(preq->pad)); |
| 280 | sg_init_table(preq->src, 1); |
| 281 | sg_set_buf(preq->src, preq->pad, padlen); |
| 282 | |
| 283 | ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| 284 | poly_adpad_done, req); |
| 285 | ahash_request_set_tfm(&preq->req, ctx->poly); |
| 286 | ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); |
| 287 | |
| 288 | err = crypto_ahash_update(&preq->req); |
| 289 | if (err) |
| 290 | return err; |
| 291 | |
| 292 | return poly_cipher(req); |
| 293 | } |
| 294 | |
| 295 | static void poly_ad_done(struct crypto_async_request *areq, int err) |
| 296 | { |
| 297 | async_done_continue(areq->data, err, poly_adpad); |
| 298 | } |
| 299 | |
| 300 | static int poly_ad(struct aead_request *req) |
| 301 | { |
| 302 | struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 303 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 304 | struct poly_req *preq = &rctx->u.poly; |
| 305 | int err; |
| 306 | |
| 307 | ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| 308 | poly_ad_done, req); |
| 309 | ahash_request_set_tfm(&preq->req, ctx->poly); |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 310 | ahash_request_set_crypt(&preq->req, req->src, NULL, rctx->assoclen); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 311 | |
| 312 | err = crypto_ahash_update(&preq->req); |
| 313 | if (err) |
| 314 | return err; |
| 315 | |
| 316 | return poly_adpad(req); |
| 317 | } |
| 318 | |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 319 | static void poly_setkey_done(struct crypto_async_request *areq, int err) |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 320 | { |
| 321 | async_done_continue(areq->data, err, poly_ad); |
| 322 | } |
| 323 | |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 324 | static int poly_setkey(struct aead_request *req) |
| 325 | { |
| 326 | struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 327 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 328 | struct poly_req *preq = &rctx->u.poly; |
| 329 | int err; |
| 330 | |
| 331 | sg_init_table(preq->src, 1); |
| 332 | sg_set_buf(preq->src, rctx->key, sizeof(rctx->key)); |
| 333 | |
| 334 | ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| 335 | poly_setkey_done, req); |
| 336 | ahash_request_set_tfm(&preq->req, ctx->poly); |
| 337 | ahash_request_set_crypt(&preq->req, preq->src, NULL, sizeof(rctx->key)); |
| 338 | |
| 339 | err = crypto_ahash_update(&preq->req); |
| 340 | if (err) |
| 341 | return err; |
| 342 | |
| 343 | return poly_ad(req); |
| 344 | } |
| 345 | |
| 346 | static void poly_init_done(struct crypto_async_request *areq, int err) |
| 347 | { |
| 348 | async_done_continue(areq->data, err, poly_setkey); |
| 349 | } |
| 350 | |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 351 | static int poly_init(struct aead_request *req) |
| 352 | { |
| 353 | struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 354 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 355 | struct poly_req *preq = &rctx->u.poly; |
| 356 | int err; |
| 357 | |
| 358 | ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| 359 | poly_init_done, req); |
| 360 | ahash_request_set_tfm(&preq->req, ctx->poly); |
| 361 | |
| 362 | err = crypto_ahash_init(&preq->req); |
| 363 | if (err) |
| 364 | return err; |
| 365 | |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 366 | return poly_setkey(req); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | static void poly_genkey_done(struct crypto_async_request *areq, int err) |
| 370 | { |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 371 | async_done_continue(areq->data, err, poly_init); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | static int poly_genkey(struct aead_request *req) |
| 375 | { |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 376 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| 377 | struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 378 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 379 | struct chacha_req *creq = &rctx->u.chacha; |
| 380 | int err; |
| 381 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 382 | rctx->assoclen = req->assoclen; |
| 383 | |
| 384 | if (crypto_aead_ivsize(tfm) == 8) { |
| 385 | if (rctx->assoclen < 8) |
| 386 | return -EINVAL; |
| 387 | rctx->assoclen -= 8; |
| 388 | } |
| 389 | |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 390 | sg_init_table(creq->src, 1); |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 391 | memset(rctx->key, 0, sizeof(rctx->key)); |
| 392 | sg_set_buf(creq->src, rctx->key, sizeof(rctx->key)); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 393 | |
| 394 | chacha_iv(creq->iv, req, 0); |
| 395 | |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 396 | skcipher_request_set_callback(&creq->req, aead_request_flags(req), |
| 397 | poly_genkey_done, req); |
| 398 | skcipher_request_set_tfm(&creq->req, ctx->chacha); |
| 399 | skcipher_request_set_crypt(&creq->req, creq->src, creq->src, |
| 400 | POLY1305_KEY_SIZE, creq->iv); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 401 | |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 402 | err = crypto_skcipher_decrypt(&creq->req); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 403 | if (err) |
| 404 | return err; |
| 405 | |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 406 | return poly_init(req); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 407 | } |
| 408 | |
| 409 | static void chacha_encrypt_done(struct crypto_async_request *areq, int err) |
| 410 | { |
| 411 | async_done_continue(areq->data, err, poly_genkey); |
| 412 | } |
| 413 | |
| 414 | static int chacha_encrypt(struct aead_request *req) |
| 415 | { |
| 416 | struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 417 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 418 | struct chacha_req *creq = &rctx->u.chacha; |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 419 | struct scatterlist *src, *dst; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 420 | int err; |
| 421 | |
Jason A. Donenfeld | 161151d | 2015-12-06 02:51:38 +0100 | [diff] [blame] | 422 | if (req->cryptlen == 0) |
| 423 | goto skip; |
| 424 | |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 425 | chacha_iv(creq->iv, req, 1); |
| 426 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 427 | sg_init_table(rctx->src, 2); |
| 428 | src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen); |
| 429 | dst = src; |
| 430 | |
| 431 | if (req->src != req->dst) { |
| 432 | sg_init_table(rctx->dst, 2); |
| 433 | dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); |
| 434 | } |
| 435 | |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 436 | skcipher_request_set_callback(&creq->req, aead_request_flags(req), |
| 437 | chacha_encrypt_done, req); |
| 438 | skcipher_request_set_tfm(&creq->req, ctx->chacha); |
| 439 | skcipher_request_set_crypt(&creq->req, src, dst, |
| 440 | req->cryptlen, creq->iv); |
| 441 | err = crypto_skcipher_encrypt(&creq->req); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 442 | if (err) |
| 443 | return err; |
| 444 | |
Jason A. Donenfeld | 161151d | 2015-12-06 02:51:38 +0100 | [diff] [blame] | 445 | skip: |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 446 | return poly_genkey(req); |
| 447 | } |
| 448 | |
| 449 | static int chachapoly_encrypt(struct aead_request *req) |
| 450 | { |
| 451 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 452 | |
| 453 | rctx->cryptlen = req->cryptlen; |
| 454 | |
| 455 | /* encrypt call chain: |
| 456 | * - chacha_encrypt/done() |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 457 | * - poly_genkey/done() |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 458 | * - poly_init/done() |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 459 | * - poly_setkey/done() |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 460 | * - poly_ad/done() |
| 461 | * - poly_adpad/done() |
| 462 | * - poly_cipher/done() |
| 463 | * - poly_cipherpad/done() |
| 464 | * - poly_tail/done/continue() |
| 465 | * - poly_copy_tag() |
| 466 | */ |
| 467 | return chacha_encrypt(req); |
| 468 | } |
| 469 | |
| 470 | static int chachapoly_decrypt(struct aead_request *req) |
| 471 | { |
| 472 | struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| 473 | |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 474 | rctx->cryptlen = req->cryptlen - POLY1305_DIGEST_SIZE; |
| 475 | |
| 476 | /* decrypt call chain: |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 477 | * - poly_genkey/done() |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 478 | * - poly_init/done() |
Martin Willi | c2b7b20a | 2015-06-16 11:34:16 +0200 | [diff] [blame] | 479 | * - poly_setkey/done() |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 480 | * - poly_ad/done() |
| 481 | * - poly_adpad/done() |
| 482 | * - poly_cipher/done() |
| 483 | * - poly_cipherpad/done() |
| 484 | * - poly_tail/done/continue() |
| 485 | * - chacha_decrypt/done() |
| 486 | * - poly_verify_tag() |
| 487 | */ |
| 488 | return poly_genkey(req); |
| 489 | } |
| 490 | |
| 491 | static int chachapoly_setkey(struct crypto_aead *aead, const u8 *key, |
| 492 | unsigned int keylen) |
| 493 | { |
| 494 | struct chachapoly_ctx *ctx = crypto_aead_ctx(aead); |
| 495 | int err; |
| 496 | |
| 497 | if (keylen != ctx->saltlen + CHACHA20_KEY_SIZE) |
| 498 | return -EINVAL; |
| 499 | |
| 500 | keylen -= ctx->saltlen; |
| 501 | memcpy(ctx->salt, key + keylen, ctx->saltlen); |
| 502 | |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 503 | crypto_skcipher_clear_flags(ctx->chacha, CRYPTO_TFM_REQ_MASK); |
| 504 | crypto_skcipher_set_flags(ctx->chacha, crypto_aead_get_flags(aead) & |
| 505 | CRYPTO_TFM_REQ_MASK); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 506 | |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 507 | err = crypto_skcipher_setkey(ctx->chacha, key, keylen); |
| 508 | crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctx->chacha) & |
| 509 | CRYPTO_TFM_RES_MASK); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 510 | return err; |
| 511 | } |
| 512 | |
| 513 | static int chachapoly_setauthsize(struct crypto_aead *tfm, |
| 514 | unsigned int authsize) |
| 515 | { |
| 516 | if (authsize != POLY1305_DIGEST_SIZE) |
| 517 | return -EINVAL; |
| 518 | |
| 519 | return 0; |
| 520 | } |
| 521 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 522 | static int chachapoly_init(struct crypto_aead *tfm) |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 523 | { |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 524 | struct aead_instance *inst = aead_alg_instance(tfm); |
| 525 | struct chachapoly_instance_ctx *ictx = aead_instance_ctx(inst); |
| 526 | struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 527 | struct crypto_skcipher *chacha; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 528 | struct crypto_ahash *poly; |
| 529 | unsigned long align; |
| 530 | |
| 531 | poly = crypto_spawn_ahash(&ictx->poly); |
| 532 | if (IS_ERR(poly)) |
| 533 | return PTR_ERR(poly); |
| 534 | |
Eric Biggers | 60425a8 | 2016-10-28 09:52:19 -0700 | [diff] [blame] | 535 | chacha = crypto_spawn_skcipher(&ictx->chacha); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 536 | if (IS_ERR(chacha)) { |
| 537 | crypto_free_ahash(poly); |
| 538 | return PTR_ERR(chacha); |
| 539 | } |
| 540 | |
| 541 | ctx->chacha = chacha; |
| 542 | ctx->poly = poly; |
| 543 | ctx->saltlen = ictx->saltlen; |
| 544 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 545 | align = crypto_aead_alignmask(tfm); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 546 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 547 | crypto_aead_set_reqsize( |
| 548 | tfm, |
| 549 | align + offsetof(struct chachapoly_req_ctx, u) + |
| 550 | max(offsetof(struct chacha_req, req) + |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 551 | sizeof(struct skcipher_request) + |
| 552 | crypto_skcipher_reqsize(chacha), |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 553 | offsetof(struct poly_req, req) + |
| 554 | sizeof(struct ahash_request) + |
| 555 | crypto_ahash_reqsize(poly))); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 556 | |
| 557 | return 0; |
| 558 | } |
| 559 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 560 | static void chachapoly_exit(struct crypto_aead *tfm) |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 561 | { |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 562 | struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 563 | |
| 564 | crypto_free_ahash(ctx->poly); |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 565 | crypto_free_skcipher(ctx->chacha); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 566 | } |
| 567 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 568 | static void chachapoly_free(struct aead_instance *inst) |
| 569 | { |
| 570 | struct chachapoly_instance_ctx *ctx = aead_instance_ctx(inst); |
| 571 | |
| 572 | crypto_drop_skcipher(&ctx->chacha); |
| 573 | crypto_drop_ahash(&ctx->poly); |
| 574 | kfree(inst); |
| 575 | } |
| 576 | |
| 577 | static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, |
| 578 | const char *name, unsigned int ivsize) |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 579 | { |
| 580 | struct crypto_attr_type *algt; |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 581 | struct aead_instance *inst; |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 582 | struct skcipher_alg *chacha; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 583 | struct crypto_alg *poly; |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 584 | struct hash_alg_common *poly_hash; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 585 | struct chachapoly_instance_ctx *ctx; |
| 586 | const char *chacha_name, *poly_name; |
| 587 | int err; |
| 588 | |
| 589 | if (ivsize > CHACHAPOLY_IV_SIZE) |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 590 | return -EINVAL; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 591 | |
| 592 | algt = crypto_get_attr_type(tb); |
| 593 | if (IS_ERR(algt)) |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 594 | return PTR_ERR(algt); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 595 | |
Herbert Xu | 5e4b8c1 | 2015-08-13 17:29:06 +0800 | [diff] [blame] | 596 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 597 | return -EINVAL; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 598 | |
| 599 | chacha_name = crypto_attr_alg_name(tb[1]); |
| 600 | if (IS_ERR(chacha_name)) |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 601 | return PTR_ERR(chacha_name); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 602 | poly_name = crypto_attr_alg_name(tb[2]); |
| 603 | if (IS_ERR(poly_name)) |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 604 | return PTR_ERR(poly_name); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 605 | |
| 606 | poly = crypto_find_alg(poly_name, &crypto_ahash_type, |
| 607 | CRYPTO_ALG_TYPE_HASH, |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 608 | CRYPTO_ALG_TYPE_AHASH_MASK | |
| 609 | crypto_requires_sync(algt->type, |
| 610 | algt->mask)); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 611 | if (IS_ERR(poly)) |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 612 | return PTR_ERR(poly); |
Eric Biggers | e57121d | 2017-12-11 12:15:17 -0800 | [diff] [blame] | 613 | poly_hash = __crypto_hash_alg_common(poly); |
| 614 | |
| 615 | err = -EINVAL; |
| 616 | if (poly_hash->digestsize != POLY1305_DIGEST_SIZE) |
| 617 | goto out_put_poly; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 618 | |
| 619 | err = -ENOMEM; |
| 620 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| 621 | if (!inst) |
| 622 | goto out_put_poly; |
| 623 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 624 | ctx = aead_instance_ctx(inst); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 625 | ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize; |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 626 | err = crypto_init_ahash_spawn(&ctx->poly, poly_hash, |
| 627 | aead_crypto_instance(inst)); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 628 | if (err) |
| 629 | goto err_free_inst; |
| 630 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 631 | crypto_set_skcipher_spawn(&ctx->chacha, aead_crypto_instance(inst)); |
Eric Biggers | a35528e | 2016-10-28 09:51:13 -0700 | [diff] [blame] | 632 | err = crypto_grab_skcipher(&ctx->chacha, chacha_name, 0, |
| 633 | crypto_requires_sync(algt->type, |
| 634 | algt->mask)); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 635 | if (err) |
| 636 | goto err_drop_poly; |
| 637 | |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 638 | chacha = crypto_spawn_skcipher_alg(&ctx->chacha); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 639 | |
| 640 | err = -EINVAL; |
| 641 | /* Need 16-byte IV size, including Initial Block Counter value */ |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 642 | if (crypto_skcipher_alg_ivsize(chacha) != CHACHA20_IV_SIZE) |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 643 | goto out_drop_chacha; |
| 644 | /* Not a stream cipher? */ |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 645 | if (chacha->base.cra_blocksize != 1) |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 646 | goto out_drop_chacha; |
| 647 | |
| 648 | err = -ENAMETOOLONG; |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 649 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 650 | "%s(%s,%s)", name, chacha_name, |
| 651 | poly_name) >= CRYPTO_MAX_ALG_NAME) |
| 652 | goto out_drop_chacha; |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 653 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 654 | "%s(%s,%s)", name, chacha->base.cra_driver_name, |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 655 | poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
| 656 | goto out_drop_chacha; |
| 657 | |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 658 | inst->alg.base.cra_flags = (chacha->base.cra_flags | poly->cra_flags) & |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 659 | CRYPTO_ALG_ASYNC; |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 660 | inst->alg.base.cra_priority = (chacha->base.cra_priority + |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 661 | poly->cra_priority) / 2; |
| 662 | inst->alg.base.cra_blocksize = 1; |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 663 | inst->alg.base.cra_alignmask = chacha->base.cra_alignmask | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 664 | poly->cra_alignmask; |
| 665 | inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) + |
| 666 | ctx->saltlen; |
| 667 | inst->alg.ivsize = ivsize; |
Herbert Xu | 1e1f006 | 2016-07-12 13:17:40 +0800 | [diff] [blame] | 668 | inst->alg.chunksize = crypto_skcipher_alg_chunksize(chacha); |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 669 | inst->alg.maxauthsize = POLY1305_DIGEST_SIZE; |
| 670 | inst->alg.init = chachapoly_init; |
| 671 | inst->alg.exit = chachapoly_exit; |
| 672 | inst->alg.encrypt = chachapoly_encrypt; |
| 673 | inst->alg.decrypt = chachapoly_decrypt; |
| 674 | inst->alg.setkey = chachapoly_setkey; |
| 675 | inst->alg.setauthsize = chachapoly_setauthsize; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 676 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 677 | inst->free = chachapoly_free; |
| 678 | |
| 679 | err = aead_register_instance(tmpl, inst); |
| 680 | if (err) |
| 681 | goto out_drop_chacha; |
| 682 | |
| 683 | out_put_poly: |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 684 | crypto_mod_put(poly); |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 685 | return err; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 686 | |
| 687 | out_drop_chacha: |
| 688 | crypto_drop_skcipher(&ctx->chacha); |
| 689 | err_drop_poly: |
| 690 | crypto_drop_ahash(&ctx->poly); |
| 691 | err_free_inst: |
| 692 | kfree(inst); |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 693 | goto out_put_poly; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 694 | } |
| 695 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 696 | static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb) |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 697 | { |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 698 | return chachapoly_create(tmpl, tb, "rfc7539", 12); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 699 | } |
| 700 | |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 701 | static int rfc7539esp_create(struct crypto_template *tmpl, struct rtattr **tb) |
Martin Willi | 4db4ad2 | 2015-06-01 13:44:02 +0200 | [diff] [blame] | 702 | { |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 703 | return chachapoly_create(tmpl, tb, "rfc7539esp", 8); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | static struct crypto_template rfc7539_tmpl = { |
| 707 | .name = "rfc7539", |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 708 | .create = rfc7539_create, |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 709 | .module = THIS_MODULE, |
| 710 | }; |
| 711 | |
Martin Willi | 4db4ad2 | 2015-06-01 13:44:02 +0200 | [diff] [blame] | 712 | static struct crypto_template rfc7539esp_tmpl = { |
| 713 | .name = "rfc7539esp", |
Herbert Xu | 7479092 | 2015-07-16 12:35:08 +0800 | [diff] [blame] | 714 | .create = rfc7539esp_create, |
Martin Willi | 4db4ad2 | 2015-06-01 13:44:02 +0200 | [diff] [blame] | 715 | .module = THIS_MODULE, |
| 716 | }; |
| 717 | |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 718 | static int __init chacha20poly1305_module_init(void) |
| 719 | { |
Martin Willi | 4db4ad2 | 2015-06-01 13:44:02 +0200 | [diff] [blame] | 720 | int err; |
| 721 | |
| 722 | err = crypto_register_template(&rfc7539_tmpl); |
| 723 | if (err) |
| 724 | return err; |
| 725 | |
| 726 | err = crypto_register_template(&rfc7539esp_tmpl); |
| 727 | if (err) |
| 728 | crypto_unregister_template(&rfc7539_tmpl); |
| 729 | |
| 730 | return err; |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | static void __exit chacha20poly1305_module_exit(void) |
| 734 | { |
Martin Willi | 4db4ad2 | 2015-06-01 13:44:02 +0200 | [diff] [blame] | 735 | crypto_unregister_template(&rfc7539esp_tmpl); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 736 | crypto_unregister_template(&rfc7539_tmpl); |
| 737 | } |
| 738 | |
| 739 | module_init(chacha20poly1305_module_init); |
| 740 | module_exit(chacha20poly1305_module_exit); |
| 741 | |
| 742 | MODULE_LICENSE("GPL"); |
| 743 | MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); |
| 744 | MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD"); |
Martin Willi | 71ebc4d | 2015-06-01 13:44:00 +0200 | [diff] [blame] | 745 | MODULE_ALIAS_CRYPTO("rfc7539"); |
Martin Willi | 4db4ad2 | 2015-06-01 13:44:02 +0200 | [diff] [blame] | 746 | MODULE_ALIAS_CRYPTO("rfc7539esp"); |