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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* echainiv: Encrypted Chain IV Generator
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*
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* This generator generates an IV based on a sequence number by multiplying
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* it with a salt and then encrypting it with the same key as used to encrypt
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* the plain text. This algorithm requires that the block size be equal
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* to the IV size. It is mainly useful for CBC.
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*
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* This generator can only be used by algorithms where authentication
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* is performed after encryption (i.e., authenc).
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*
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* Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
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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 int echainiv_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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__be64 nseqno;
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u64 seqno;
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u8 *info;
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unsigned int ivsize = crypto_aead_ivsize(geniv);
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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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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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aead_request_set_callback(subreq, req->base.flags,
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req->base.complete, req->base.data);
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aead_request_set_crypt(subreq, req->dst, req->dst,
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req->cryptlen, info);
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aead_request_set_ad(subreq, req->assoclen);
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memcpy(&nseqno, info + ivsize - 8, 8);
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seqno = be64_to_cpu(nseqno);
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memset(info, 0, ivsize);
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scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1);
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do {
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u64 a;
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memcpy(&a, ctx->salt + ivsize - 8, 8);
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a |= 1;
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a *= seqno;
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memcpy(info + ivsize - 8, &a, 8);
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} while ((ivsize -= 8));
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return crypto_aead_encrypt(subreq);
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}
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static int echainiv_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 = crypto_aead_ivsize(geniv);
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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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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 echainiv_aead_create(struct crypto_template *tmpl,
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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, 0, 0);
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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) - 1) || !inst->alg.ivsize)
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goto free_inst;
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inst->alg.encrypt = echainiv_encrypt;
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inst->alg.decrypt = echainiv_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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inst->free = aead_geniv_free;
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err = aead_register_instance(tmpl, inst);
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if (err)
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goto free_inst;
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out:
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return err;
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free_inst:
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aead_geniv_free(inst);
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goto out;
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}
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static void echainiv_free(struct crypto_instance *inst)
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{
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aead_geniv_free(aead_instance(inst));
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}
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static struct crypto_template echainiv_tmpl = {
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.name = "echainiv",
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.create = echainiv_aead_create,
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.free = echainiv_free,
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.module = THIS_MODULE,
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};
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static int __init echainiv_module_init(void)
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{
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return crypto_register_template(&echainiv_tmpl);
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}
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static void __exit echainiv_module_exit(void)
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{
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crypto_unregister_template(&echainiv_tmpl);
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}
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subsys_initcall(echainiv_module_init);
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module_exit(echainiv_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Encrypted Chain IV Generator");
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MODULE_ALIAS_CRYPTO("echainiv");
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