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188 lines
4.5 KiB
188 lines
4.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* seqiv: Sequence Number IV Generator |
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* |
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* This generator generates an IV based on a sequence number by xoring it |
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* with a salt. This algorithm is mainly useful for CTR and similar modes. |
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* |
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* Copyright (c) 2007 Herbert Xu <[email protected]> |
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*/ |
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#include <crypto/internal/geniv.h> |
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#include <crypto/scatterwalk.h> |
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#include <crypto/skcipher.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/string.h> |
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static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err) |
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{ |
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struct aead_request *subreq = aead_request_ctx(req); |
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struct crypto_aead *geniv; |
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if (err == -EINPROGRESS) |
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return; |
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if (err) |
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goto out; |
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geniv = crypto_aead_reqtfm(req); |
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memcpy(req->iv, subreq->iv, crypto_aead_ivsize(geniv)); |
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out: |
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kfree_sensitive(subreq->iv); |
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} |
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static void seqiv_aead_encrypt_complete(struct crypto_async_request *base, |
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int err) |
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{ |
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struct aead_request *req = base->data; |
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seqiv_aead_encrypt_complete2(req, err); |
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aead_request_complete(req, err); |
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} |
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static int seqiv_aead_encrypt(struct aead_request *req) |
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{ |
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struct crypto_aead *geniv = crypto_aead_reqtfm(req); |
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv); |
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struct aead_request *subreq = aead_request_ctx(req); |
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crypto_completion_t compl; |
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void *data; |
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u8 *info; |
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unsigned int ivsize = 8; |
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int err; |
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if (req->cryptlen < ivsize) |
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return -EINVAL; |
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aead_request_set_tfm(subreq, ctx->child); |
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compl = req->base.complete; |
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data = req->base.data; |
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info = req->iv; |
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if (req->src != req->dst) { |
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SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->sknull); |
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skcipher_request_set_sync_tfm(nreq, ctx->sknull); |
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skcipher_request_set_callback(nreq, req->base.flags, |
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NULL, NULL); |
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skcipher_request_set_crypt(nreq, req->src, req->dst, |
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req->assoclen + req->cryptlen, |
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NULL); |
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err = crypto_skcipher_encrypt(nreq); |
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if (err) |
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return err; |
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} |
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if (unlikely(!IS_ALIGNED((unsigned long)info, |
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crypto_aead_alignmask(geniv) + 1))) { |
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info = kmemdup(req->iv, ivsize, req->base.flags & |
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CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL : |
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GFP_ATOMIC); |
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if (!info) |
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return -ENOMEM; |
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compl = seqiv_aead_encrypt_complete; |
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data = req; |
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} |
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aead_request_set_callback(subreq, req->base.flags, compl, data); |
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aead_request_set_crypt(subreq, req->dst, req->dst, |
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req->cryptlen - ivsize, info); |
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aead_request_set_ad(subreq, req->assoclen + ivsize); |
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crypto_xor(info, ctx->salt, ivsize); |
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scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1); |
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err = crypto_aead_encrypt(subreq); |
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if (unlikely(info != req->iv)) |
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seqiv_aead_encrypt_complete2(req, err); |
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return err; |
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} |
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static int seqiv_aead_decrypt(struct aead_request *req) |
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{ |
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struct crypto_aead *geniv = crypto_aead_reqtfm(req); |
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv); |
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struct aead_request *subreq = aead_request_ctx(req); |
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crypto_completion_t compl; |
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void *data; |
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unsigned int ivsize = 8; |
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if (req->cryptlen < ivsize + crypto_aead_authsize(geniv)) |
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return -EINVAL; |
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aead_request_set_tfm(subreq, ctx->child); |
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compl = req->base.complete; |
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data = req->base.data; |
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aead_request_set_callback(subreq, req->base.flags, compl, data); |
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aead_request_set_crypt(subreq, req->src, req->dst, |
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req->cryptlen - ivsize, req->iv); |
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aead_request_set_ad(subreq, req->assoclen + ivsize); |
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scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0); |
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return crypto_aead_decrypt(subreq); |
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} |
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static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb) |
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{ |
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struct aead_instance *inst; |
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int err; |
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inst = aead_geniv_alloc(tmpl, tb); |
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if (IS_ERR(inst)) |
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return PTR_ERR(inst); |
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err = -EINVAL; |
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if (inst->alg.ivsize != sizeof(u64)) |
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goto free_inst; |
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inst->alg.encrypt = seqiv_aead_encrypt; |
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inst->alg.decrypt = seqiv_aead_decrypt; |
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inst->alg.init = aead_init_geniv; |
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inst->alg.exit = aead_exit_geniv; |
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inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx); |
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inst->alg.base.cra_ctxsize += inst->alg.ivsize; |
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err = aead_register_instance(tmpl, inst); |
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if (err) { |
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free_inst: |
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inst->free(inst); |
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} |
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return err; |
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} |
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static struct crypto_template seqiv_tmpl = { |
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.name = "seqiv", |
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.create = seqiv_aead_create, |
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.module = THIS_MODULE, |
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}; |
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static int __init seqiv_module_init(void) |
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{ |
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return crypto_register_template(&seqiv_tmpl); |
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} |
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static void __exit seqiv_module_exit(void) |
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{ |
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crypto_unregister_template(&seqiv_tmpl); |
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} |
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subsys_initcall(seqiv_module_init); |
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module_exit(seqiv_module_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Sequence Number IV Generator"); |
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MODULE_ALIAS_CRYPTO("seqiv");
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