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![Herbert Xu](/assets/img/avatar_default.png)
This patch replaces the seqiv init/exit handlers with the generic geniv helpers. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
377 lines
8.9 KiB
C
377 lines
8.9 KiB
C
/*
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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 <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/internal/geniv.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/rng.h>
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#include <crypto/scatterwalk.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/spinlock.h>
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#include <linux/string.h>
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struct seqiv_ctx {
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spinlock_t lock;
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u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
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};
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static void seqiv_free(struct crypto_instance *inst);
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static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err)
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{
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struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
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struct crypto_ablkcipher *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 = skcipher_givcrypt_reqtfm(req);
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memcpy(req->creq.info, subreq->info, crypto_ablkcipher_ivsize(geniv));
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out:
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kfree(subreq->info);
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}
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static void seqiv_complete(struct crypto_async_request *base, int err)
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{
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struct skcipher_givcrypt_request *req = base->data;
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seqiv_complete2(req, err);
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skcipher_givcrypt_complete(req, err);
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}
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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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kzfree(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 void seqiv_geniv(struct seqiv_ctx *ctx, u8 *info, u64 seq,
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unsigned int ivsize)
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{
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unsigned int len = ivsize;
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if (ivsize > sizeof(u64)) {
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memset(info, 0, ivsize - sizeof(u64));
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len = sizeof(u64);
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}
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seq = cpu_to_be64(seq);
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memcpy(info + ivsize - len, &seq, len);
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crypto_xor(info, ctx->salt, ivsize);
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}
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static int seqiv_givencrypt(struct skcipher_givcrypt_request *req)
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{
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struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
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struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
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struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(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;
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int err;
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ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
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compl = req->creq.base.complete;
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data = req->creq.base.data;
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info = req->creq.info;
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ivsize = crypto_ablkcipher_ivsize(geniv);
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if (unlikely(!IS_ALIGNED((unsigned long)info,
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crypto_ablkcipher_alignmask(geniv) + 1))) {
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info = kmalloc(ivsize, req->creq.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_complete;
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data = req;
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}
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ablkcipher_request_set_callback(subreq, req->creq.base.flags, compl,
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data);
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ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
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req->creq.nbytes, info);
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seqiv_geniv(ctx, info, req->seq, ivsize);
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memcpy(req->giv, info, ivsize);
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err = crypto_ablkcipher_encrypt(subreq);
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if (unlikely(info != req->creq.info))
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seqiv_complete2(req, err);
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return 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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struct blkcipher_desc desc = {
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.tfm = ctx->null,
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};
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err = crypto_blkcipher_encrypt(&desc, req->dst, req->src,
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req->assoclen + req->cryptlen);
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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 = kmalloc(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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memcpy(info, req->iv, ivsize);
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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_init(struct crypto_tfm *tfm)
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{
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struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
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struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
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int err;
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spin_lock_init(&ctx->lock);
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tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);
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err = 0;
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if (!crypto_get_default_rng()) {
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crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt;
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err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
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crypto_ablkcipher_ivsize(geniv));
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crypto_put_default_rng();
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}
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return err ?: skcipher_geniv_init(tfm);
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}
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static int seqiv_ablkcipher_create(struct crypto_template *tmpl,
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struct rtattr **tb)
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{
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struct crypto_instance *inst;
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int err;
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inst = skcipher_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.cra_ablkcipher.ivsize < sizeof(u64))
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goto free_inst;
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inst->alg.cra_init = seqiv_init;
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inst->alg.cra_exit = skcipher_geniv_exit;
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inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
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inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx);
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inst->alg.cra_alignmask |= __alignof__(u32) - 1;
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err = crypto_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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skcipher_geniv_free(inst);
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goto out;
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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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struct crypto_aead_spawn *spawn;
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struct aead_alg *alg;
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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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inst->alg.base.cra_alignmask |= __alignof__(u32) - 1;
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spawn = aead_instance_ctx(inst);
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alg = crypto_spawn_aead_alg(spawn);
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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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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 int seqiv_create(struct crypto_template *tmpl, struct rtattr **tb)
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{
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struct crypto_attr_type *algt;
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int err;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return PTR_ERR(algt);
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if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
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err = seqiv_ablkcipher_create(tmpl, tb);
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else
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err = seqiv_aead_create(tmpl, tb);
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return err;
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}
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static void seqiv_free(struct crypto_instance *inst)
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{
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if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK)
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skcipher_geniv_free(inst);
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else
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aead_geniv_free(aead_instance(inst));
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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_create,
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.free = seqiv_free,
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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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module_init(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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