| /* |
| * ChaCha20-Poly1305 AEAD, RFC7539 |
| * |
| * Copyright (C) 2015 Martin Willi |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| #include <crypto/internal/aead.h> |
| #include <crypto/internal/hash.h> |
| #include <crypto/internal/skcipher.h> |
| #include <crypto/scatterwalk.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| |
| #include "internal.h" |
| |
| #define POLY1305_BLOCK_SIZE 16 |
| #define POLY1305_DIGEST_SIZE 16 |
| #define POLY1305_KEY_SIZE 32 |
| #define CHACHA20_KEY_SIZE 32 |
| #define CHACHA20_IV_SIZE 16 |
| #define CHACHAPOLY_IV_SIZE 12 |
| |
| struct chachapoly_instance_ctx { |
| struct crypto_skcipher_spawn chacha; |
| struct crypto_ahash_spawn poly; |
| unsigned int saltlen; |
| }; |
| |
| struct chachapoly_ctx { |
| struct crypto_ablkcipher *chacha; |
| struct crypto_ahash *poly; |
| /* key bytes we use for the ChaCha20 IV */ |
| unsigned int saltlen; |
| u8 salt[]; |
| }; |
| |
| struct poly_req { |
| /* zero byte padding for AD/ciphertext, as needed */ |
| u8 pad[POLY1305_BLOCK_SIZE]; |
| /* tail data with AD/ciphertext lengths */ |
| struct { |
| __le64 assoclen; |
| __le64 cryptlen; |
| } tail; |
| struct scatterlist src[1]; |
| struct ahash_request req; /* must be last member */ |
| }; |
| |
| struct chacha_req { |
| u8 iv[CHACHA20_IV_SIZE]; |
| struct scatterlist src[1]; |
| struct ablkcipher_request req; /* must be last member */ |
| }; |
| |
| struct chachapoly_req_ctx { |
| struct scatterlist src[2]; |
| struct scatterlist dst[2]; |
| /* the key we generate for Poly1305 using Chacha20 */ |
| u8 key[POLY1305_KEY_SIZE]; |
| /* calculated Poly1305 tag */ |
| u8 tag[POLY1305_DIGEST_SIZE]; |
| /* length of data to en/decrypt, without ICV */ |
| unsigned int cryptlen; |
| /* Actual AD, excluding IV */ |
| unsigned int assoclen; |
| union { |
| struct poly_req poly; |
| struct chacha_req chacha; |
| } u; |
| }; |
| |
| static inline void async_done_continue(struct aead_request *req, int err, |
| int (*cont)(struct aead_request *)) |
| { |
| if (!err) |
| err = cont(req); |
| |
| if (err != -EINPROGRESS && err != -EBUSY) |
| aead_request_complete(req, err); |
| } |
| |
| static void chacha_iv(u8 *iv, struct aead_request *req, u32 icb) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| __le32 leicb = cpu_to_le32(icb); |
| |
| memcpy(iv, &leicb, sizeof(leicb)); |
| memcpy(iv + sizeof(leicb), ctx->salt, ctx->saltlen); |
| memcpy(iv + sizeof(leicb) + ctx->saltlen, req->iv, |
| CHACHA20_IV_SIZE - sizeof(leicb) - ctx->saltlen); |
| } |
| |
| static int poly_verify_tag(struct aead_request *req) |
| { |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| u8 tag[sizeof(rctx->tag)]; |
| |
| scatterwalk_map_and_copy(tag, req->src, |
| req->assoclen + rctx->cryptlen, |
| sizeof(tag), 0); |
| if (crypto_memneq(tag, rctx->tag, sizeof(tag))) |
| return -EBADMSG; |
| return 0; |
| } |
| |
| static int poly_copy_tag(struct aead_request *req) |
| { |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| |
| scatterwalk_map_and_copy(rctx->tag, req->dst, |
| req->assoclen + rctx->cryptlen, |
| sizeof(rctx->tag), 1); |
| return 0; |
| } |
| |
| static void chacha_decrypt_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_verify_tag); |
| } |
| |
| static int chacha_decrypt(struct aead_request *req) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct chacha_req *creq = &rctx->u.chacha; |
| struct scatterlist *src, *dst; |
| int err; |
| |
| chacha_iv(creq->iv, req, 1); |
| |
| sg_init_table(rctx->src, 2); |
| src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen); |
| dst = src; |
| |
| if (req->src != req->dst) { |
| sg_init_table(rctx->dst, 2); |
| dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); |
| } |
| |
| ablkcipher_request_set_callback(&creq->req, aead_request_flags(req), |
| chacha_decrypt_done, req); |
| ablkcipher_request_set_tfm(&creq->req, ctx->chacha); |
| ablkcipher_request_set_crypt(&creq->req, src, dst, |
| rctx->cryptlen, creq->iv); |
| err = crypto_ablkcipher_decrypt(&creq->req); |
| if (err) |
| return err; |
| |
| return poly_verify_tag(req); |
| } |
| |
| static int poly_tail_continue(struct aead_request *req) |
| { |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| |
| if (rctx->cryptlen == req->cryptlen) /* encrypting */ |
| return poly_copy_tag(req); |
| |
| return chacha_decrypt(req); |
| } |
| |
| static void poly_tail_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_tail_continue); |
| } |
| |
| static int poly_tail(struct aead_request *req) |
| { |
| struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct poly_req *preq = &rctx->u.poly; |
| __le64 len; |
| int err; |
| |
| sg_init_table(preq->src, 1); |
| len = cpu_to_le64(rctx->assoclen); |
| memcpy(&preq->tail.assoclen, &len, sizeof(len)); |
| len = cpu_to_le64(rctx->cryptlen); |
| memcpy(&preq->tail.cryptlen, &len, sizeof(len)); |
| sg_set_buf(preq->src, &preq->tail, sizeof(preq->tail)); |
| |
| ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| poly_tail_done, req); |
| ahash_request_set_tfm(&preq->req, ctx->poly); |
| ahash_request_set_crypt(&preq->req, preq->src, |
| rctx->tag, sizeof(preq->tail)); |
| |
| err = crypto_ahash_finup(&preq->req); |
| if (err) |
| return err; |
| |
| return poly_tail_continue(req); |
| } |
| |
| static void poly_cipherpad_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_tail); |
| } |
| |
| static int poly_cipherpad(struct aead_request *req) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct poly_req *preq = &rctx->u.poly; |
| unsigned int padlen, bs = POLY1305_BLOCK_SIZE; |
| int err; |
| |
| padlen = (bs - (rctx->cryptlen % bs)) % bs; |
| memset(preq->pad, 0, sizeof(preq->pad)); |
| sg_init_table(preq->src, 1); |
| sg_set_buf(preq->src, &preq->pad, padlen); |
| |
| ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| poly_cipherpad_done, req); |
| ahash_request_set_tfm(&preq->req, ctx->poly); |
| ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); |
| |
| err = crypto_ahash_update(&preq->req); |
| if (err) |
| return err; |
| |
| return poly_tail(req); |
| } |
| |
| static void poly_cipher_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_cipherpad); |
| } |
| |
| static int poly_cipher(struct aead_request *req) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct poly_req *preq = &rctx->u.poly; |
| struct scatterlist *crypt = req->src; |
| int err; |
| |
| if (rctx->cryptlen == req->cryptlen) /* encrypting */ |
| crypt = req->dst; |
| |
| sg_init_table(rctx->src, 2); |
| crypt = scatterwalk_ffwd(rctx->src, crypt, req->assoclen); |
| |
| ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| poly_cipher_done, req); |
| ahash_request_set_tfm(&preq->req, ctx->poly); |
| ahash_request_set_crypt(&preq->req, crypt, NULL, rctx->cryptlen); |
| |
| err = crypto_ahash_update(&preq->req); |
| if (err) |
| return err; |
| |
| return poly_cipherpad(req); |
| } |
| |
| static void poly_adpad_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_cipher); |
| } |
| |
| static int poly_adpad(struct aead_request *req) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct poly_req *preq = &rctx->u.poly; |
| unsigned int padlen, bs = POLY1305_BLOCK_SIZE; |
| int err; |
| |
| padlen = (bs - (rctx->assoclen % bs)) % bs; |
| memset(preq->pad, 0, sizeof(preq->pad)); |
| sg_init_table(preq->src, 1); |
| sg_set_buf(preq->src, preq->pad, padlen); |
| |
| ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| poly_adpad_done, req); |
| ahash_request_set_tfm(&preq->req, ctx->poly); |
| ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); |
| |
| err = crypto_ahash_update(&preq->req); |
| if (err) |
| return err; |
| |
| return poly_cipher(req); |
| } |
| |
| static void poly_ad_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_adpad); |
| } |
| |
| static int poly_ad(struct aead_request *req) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct poly_req *preq = &rctx->u.poly; |
| int err; |
| |
| ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| poly_ad_done, req); |
| ahash_request_set_tfm(&preq->req, ctx->poly); |
| ahash_request_set_crypt(&preq->req, req->src, NULL, rctx->assoclen); |
| |
| err = crypto_ahash_update(&preq->req); |
| if (err) |
| return err; |
| |
| return poly_adpad(req); |
| } |
| |
| static void poly_setkey_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_ad); |
| } |
| |
| static int poly_setkey(struct aead_request *req) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct poly_req *preq = &rctx->u.poly; |
| int err; |
| |
| sg_init_table(preq->src, 1); |
| sg_set_buf(preq->src, rctx->key, sizeof(rctx->key)); |
| |
| ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| poly_setkey_done, req); |
| ahash_request_set_tfm(&preq->req, ctx->poly); |
| ahash_request_set_crypt(&preq->req, preq->src, NULL, sizeof(rctx->key)); |
| |
| err = crypto_ahash_update(&preq->req); |
| if (err) |
| return err; |
| |
| return poly_ad(req); |
| } |
| |
| static void poly_init_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_setkey); |
| } |
| |
| static int poly_init(struct aead_request *req) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct poly_req *preq = &rctx->u.poly; |
| int err; |
| |
| ahash_request_set_callback(&preq->req, aead_request_flags(req), |
| poly_init_done, req); |
| ahash_request_set_tfm(&preq->req, ctx->poly); |
| |
| err = crypto_ahash_init(&preq->req); |
| if (err) |
| return err; |
| |
| return poly_setkey(req); |
| } |
| |
| static void poly_genkey_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_init); |
| } |
| |
| static int poly_genkey(struct aead_request *req) |
| { |
| struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct chacha_req *creq = &rctx->u.chacha; |
| int err; |
| |
| rctx->assoclen = req->assoclen; |
| |
| if (crypto_aead_ivsize(tfm) == 8) { |
| if (rctx->assoclen < 8) |
| return -EINVAL; |
| rctx->assoclen -= 8; |
| } |
| |
| sg_init_table(creq->src, 1); |
| memset(rctx->key, 0, sizeof(rctx->key)); |
| sg_set_buf(creq->src, rctx->key, sizeof(rctx->key)); |
| |
| chacha_iv(creq->iv, req, 0); |
| |
| ablkcipher_request_set_callback(&creq->req, aead_request_flags(req), |
| poly_genkey_done, req); |
| ablkcipher_request_set_tfm(&creq->req, ctx->chacha); |
| ablkcipher_request_set_crypt(&creq->req, creq->src, creq->src, |
| POLY1305_KEY_SIZE, creq->iv); |
| |
| err = crypto_ablkcipher_decrypt(&creq->req); |
| if (err) |
| return err; |
| |
| return poly_init(req); |
| } |
| |
| static void chacha_encrypt_done(struct crypto_async_request *areq, int err) |
| { |
| async_done_continue(areq->data, err, poly_genkey); |
| } |
| |
| static int chacha_encrypt(struct aead_request *req) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| struct chacha_req *creq = &rctx->u.chacha; |
| struct scatterlist *src, *dst; |
| int err; |
| |
| chacha_iv(creq->iv, req, 1); |
| |
| sg_init_table(rctx->src, 2); |
| src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen); |
| dst = src; |
| |
| if (req->src != req->dst) { |
| sg_init_table(rctx->dst, 2); |
| dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); |
| } |
| |
| ablkcipher_request_set_callback(&creq->req, aead_request_flags(req), |
| chacha_encrypt_done, req); |
| ablkcipher_request_set_tfm(&creq->req, ctx->chacha); |
| ablkcipher_request_set_crypt(&creq->req, src, dst, |
| req->cryptlen, creq->iv); |
| err = crypto_ablkcipher_encrypt(&creq->req); |
| if (err) |
| return err; |
| |
| return poly_genkey(req); |
| } |
| |
| static int chachapoly_encrypt(struct aead_request *req) |
| { |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| |
| rctx->cryptlen = req->cryptlen; |
| |
| /* encrypt call chain: |
| * - chacha_encrypt/done() |
| * - poly_genkey/done() |
| * - poly_init/done() |
| * - poly_setkey/done() |
| * - poly_ad/done() |
| * - poly_adpad/done() |
| * - poly_cipher/done() |
| * - poly_cipherpad/done() |
| * - poly_tail/done/continue() |
| * - poly_copy_tag() |
| */ |
| return chacha_encrypt(req); |
| } |
| |
| static int chachapoly_decrypt(struct aead_request *req) |
| { |
| struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
| |
| rctx->cryptlen = req->cryptlen - POLY1305_DIGEST_SIZE; |
| |
| /* decrypt call chain: |
| * - poly_genkey/done() |
| * - poly_init/done() |
| * - poly_setkey/done() |
| * - poly_ad/done() |
| * - poly_adpad/done() |
| * - poly_cipher/done() |
| * - poly_cipherpad/done() |
| * - poly_tail/done/continue() |
| * - chacha_decrypt/done() |
| * - poly_verify_tag() |
| */ |
| return poly_genkey(req); |
| } |
| |
| static int chachapoly_setkey(struct crypto_aead *aead, const u8 *key, |
| unsigned int keylen) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(aead); |
| int err; |
| |
| if (keylen != ctx->saltlen + CHACHA20_KEY_SIZE) |
| return -EINVAL; |
| |
| keylen -= ctx->saltlen; |
| memcpy(ctx->salt, key + keylen, ctx->saltlen); |
| |
| crypto_ablkcipher_clear_flags(ctx->chacha, CRYPTO_TFM_REQ_MASK); |
| crypto_ablkcipher_set_flags(ctx->chacha, crypto_aead_get_flags(aead) & |
| CRYPTO_TFM_REQ_MASK); |
| |
| err = crypto_ablkcipher_setkey(ctx->chacha, key, keylen); |
| crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctx->chacha) & |
| CRYPTO_TFM_RES_MASK); |
| return err; |
| } |
| |
| static int chachapoly_setauthsize(struct crypto_aead *tfm, |
| unsigned int authsize) |
| { |
| if (authsize != POLY1305_DIGEST_SIZE) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int chachapoly_init(struct crypto_aead *tfm) |
| { |
| struct aead_instance *inst = aead_alg_instance(tfm); |
| struct chachapoly_instance_ctx *ictx = aead_instance_ctx(inst); |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
| struct crypto_ablkcipher *chacha; |
| struct crypto_ahash *poly; |
| unsigned long align; |
| |
| poly = crypto_spawn_ahash(&ictx->poly); |
| if (IS_ERR(poly)) |
| return PTR_ERR(poly); |
| |
| chacha = crypto_spawn_skcipher(&ictx->chacha); |
| if (IS_ERR(chacha)) { |
| crypto_free_ahash(poly); |
| return PTR_ERR(chacha); |
| } |
| |
| ctx->chacha = chacha; |
| ctx->poly = poly; |
| ctx->saltlen = ictx->saltlen; |
| |
| align = crypto_aead_alignmask(tfm); |
| align &= ~(crypto_tfm_ctx_alignment() - 1); |
| crypto_aead_set_reqsize( |
| tfm, |
| align + offsetof(struct chachapoly_req_ctx, u) + |
| max(offsetof(struct chacha_req, req) + |
| sizeof(struct ablkcipher_request) + |
| crypto_ablkcipher_reqsize(chacha), |
| offsetof(struct poly_req, req) + |
| sizeof(struct ahash_request) + |
| crypto_ahash_reqsize(poly))); |
| |
| return 0; |
| } |
| |
| static void chachapoly_exit(struct crypto_aead *tfm) |
| { |
| struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
| |
| crypto_free_ahash(ctx->poly); |
| crypto_free_ablkcipher(ctx->chacha); |
| } |
| |
| static void chachapoly_free(struct aead_instance *inst) |
| { |
| struct chachapoly_instance_ctx *ctx = aead_instance_ctx(inst); |
| |
| crypto_drop_skcipher(&ctx->chacha); |
| crypto_drop_ahash(&ctx->poly); |
| kfree(inst); |
| } |
| |
| static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, |
| const char *name, unsigned int ivsize) |
| { |
| struct crypto_attr_type *algt; |
| struct aead_instance *inst; |
| struct crypto_alg *chacha; |
| struct crypto_alg *poly; |
| struct hash_alg_common *poly_hash; |
| struct chachapoly_instance_ctx *ctx; |
| const char *chacha_name, *poly_name; |
| int err; |
| |
| if (ivsize > CHACHAPOLY_IV_SIZE) |
| return -EINVAL; |
| |
| algt = crypto_get_attr_type(tb); |
| if (IS_ERR(algt)) |
| return PTR_ERR(algt); |
| |
| if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_AEAD_NEW)) & |
| algt->mask) |
| return -EINVAL; |
| |
| chacha_name = crypto_attr_alg_name(tb[1]); |
| if (IS_ERR(chacha_name)) |
| return PTR_ERR(chacha_name); |
| poly_name = crypto_attr_alg_name(tb[2]); |
| if (IS_ERR(poly_name)) |
| return PTR_ERR(poly_name); |
| |
| poly = crypto_find_alg(poly_name, &crypto_ahash_type, |
| CRYPTO_ALG_TYPE_HASH, |
| CRYPTO_ALG_TYPE_AHASH_MASK); |
| if (IS_ERR(poly)) |
| return PTR_ERR(poly); |
| |
| err = -ENOMEM; |
| inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| if (!inst) |
| goto out_put_poly; |
| |
| ctx = aead_instance_ctx(inst); |
| ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize; |
| poly_hash = __crypto_hash_alg_common(poly); |
| err = crypto_init_ahash_spawn(&ctx->poly, poly_hash, |
| aead_crypto_instance(inst)); |
| if (err) |
| goto err_free_inst; |
| |
| crypto_set_skcipher_spawn(&ctx->chacha, aead_crypto_instance(inst)); |
| err = crypto_grab_skcipher(&ctx->chacha, chacha_name, 0, |
| crypto_requires_sync(algt->type, |
| algt->mask)); |
| if (err) |
| goto err_drop_poly; |
| |
| chacha = crypto_skcipher_spawn_alg(&ctx->chacha); |
| |
| err = -EINVAL; |
| /* Need 16-byte IV size, including Initial Block Counter value */ |
| if (chacha->cra_ablkcipher.ivsize != CHACHA20_IV_SIZE) |
| goto out_drop_chacha; |
| /* Not a stream cipher? */ |
| if (chacha->cra_blocksize != 1) |
| goto out_drop_chacha; |
| |
| err = -ENAMETOOLONG; |
| if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| "%s(%s,%s)", name, chacha_name, |
| poly_name) >= CRYPTO_MAX_ALG_NAME) |
| goto out_drop_chacha; |
| if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| "%s(%s,%s)", name, chacha->cra_driver_name, |
| poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
| goto out_drop_chacha; |
| |
| inst->alg.base.cra_flags = (chacha->cra_flags | poly->cra_flags) & |
| CRYPTO_ALG_ASYNC; |
| inst->alg.base.cra_flags |= CRYPTO_ALG_AEAD_NEW; |
| inst->alg.base.cra_priority = (chacha->cra_priority + |
| poly->cra_priority) / 2; |
| inst->alg.base.cra_blocksize = 1; |
| inst->alg.base.cra_alignmask = chacha->cra_alignmask | |
| poly->cra_alignmask; |
| inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) + |
| ctx->saltlen; |
| inst->alg.ivsize = ivsize; |
| inst->alg.maxauthsize = POLY1305_DIGEST_SIZE; |
| inst->alg.init = chachapoly_init; |
| inst->alg.exit = chachapoly_exit; |
| inst->alg.encrypt = chachapoly_encrypt; |
| inst->alg.decrypt = chachapoly_decrypt; |
| inst->alg.setkey = chachapoly_setkey; |
| inst->alg.setauthsize = chachapoly_setauthsize; |
| |
| inst->free = chachapoly_free; |
| |
| err = aead_register_instance(tmpl, inst); |
| if (err) |
| goto out_drop_chacha; |
| |
| out_put_poly: |
| crypto_mod_put(poly); |
| return err; |
| |
| out_drop_chacha: |
| crypto_drop_skcipher(&ctx->chacha); |
| err_drop_poly: |
| crypto_drop_ahash(&ctx->poly); |
| err_free_inst: |
| kfree(inst); |
| goto out_put_poly; |
| } |
| |
| static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb) |
| { |
| return chachapoly_create(tmpl, tb, "rfc7539", 12); |
| } |
| |
| static int rfc7539esp_create(struct crypto_template *tmpl, struct rtattr **tb) |
| { |
| return chachapoly_create(tmpl, tb, "rfc7539esp", 8); |
| } |
| |
| static struct crypto_template rfc7539_tmpl = { |
| .name = "rfc7539", |
| .create = rfc7539_create, |
| .module = THIS_MODULE, |
| }; |
| |
| static struct crypto_template rfc7539esp_tmpl = { |
| .name = "rfc7539esp", |
| .create = rfc7539esp_create, |
| .module = THIS_MODULE, |
| }; |
| |
| static int __init chacha20poly1305_module_init(void) |
| { |
| int err; |
| |
| err = crypto_register_template(&rfc7539_tmpl); |
| if (err) |
| return err; |
| |
| err = crypto_register_template(&rfc7539esp_tmpl); |
| if (err) |
| crypto_unregister_template(&rfc7539_tmpl); |
| |
| return err; |
| } |
| |
| static void __exit chacha20poly1305_module_exit(void) |
| { |
| crypto_unregister_template(&rfc7539esp_tmpl); |
| crypto_unregister_template(&rfc7539_tmpl); |
| } |
| |
| module_init(chacha20poly1305_module_init); |
| module_exit(chacha20poly1305_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); |
| MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD"); |
| MODULE_ALIAS_CRYPTO("rfc7539"); |
| MODULE_ALIAS_CRYPTO("rfc7539esp"); |