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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-12-29 17:25:38 +00:00
crypto: aead - Add common IV generation code
This patch adds some common IV generation code currently duplicated by seqiv and echainiv. For example, the setkey and setauthsize functions are completely identical. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
b455eb80f1
commit
6350449fbf
205
crypto/aead.c
205
crypto/aead.c
@ -12,7 +12,7 @@
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*
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*/
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#include <crypto/internal/aead.h>
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#include <crypto/internal/geniv.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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@ -27,6 +27,14 @@
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#include "internal.h"
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struct compat_request_ctx {
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struct scatterlist src[2];
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struct scatterlist dst[2];
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struct scatterlist ivbuf[2];
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struct scatterlist *ivsg;
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struct aead_givcrypt_request subreq;
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};
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static int aead_null_givencrypt(struct aead_givcrypt_request *req);
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static int aead_null_givdecrypt(struct aead_givcrypt_request *req);
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@ -373,6 +381,185 @@ static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,
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return crypto_grab_spawn(&spawn->base, name, type, mask);
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}
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static int aead_geniv_setkey(struct crypto_aead *tfm,
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const u8 *key, unsigned int keylen)
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{
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
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return crypto_aead_setkey(ctx->child, key, keylen);
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}
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static int aead_geniv_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
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return crypto_aead_setauthsize(ctx->child, authsize);
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}
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static void compat_encrypt_complete2(struct aead_request *req, int err)
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{
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struct compat_request_ctx *rctx = aead_request_ctx(req);
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struct aead_givcrypt_request *subreq = &rctx->subreq;
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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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scatterwalk_map_and_copy(subreq->giv, rctx->ivsg, 0,
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crypto_aead_ivsize(geniv), 1);
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out:
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kzfree(subreq->giv);
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}
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static void compat_encrypt_complete(struct crypto_async_request *base, int err)
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{
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struct aead_request *req = base->data;
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compat_encrypt_complete2(req, err);
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aead_request_complete(req, err);
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}
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static int compat_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 compat_request_ctx *rctx = aead_request_ctx(req);
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struct aead_givcrypt_request *subreq = &rctx->subreq;
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unsigned int ivsize = crypto_aead_ivsize(geniv);
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struct scatterlist *src, *dst;
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crypto_completion_t compl;
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void *data;
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u8 *info;
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__be64 seq;
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int err;
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if (req->cryptlen < ivsize)
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return -EINVAL;
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compl = req->base.complete;
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data = req->base.data;
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rctx->ivsg = scatterwalk_ffwd(rctx->ivbuf, req->dst, req->assoclen);
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info = PageHighMem(sg_page(rctx->ivsg)) ? NULL : sg_virt(rctx->ivsg);
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if (!info) {
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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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compl = compat_encrypt_complete;
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data = req;
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}
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memcpy(&seq, req->iv + ivsize - sizeof(seq), sizeof(seq));
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src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen + ivsize);
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dst = req->src == req->dst ?
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src : scatterwalk_ffwd(rctx->dst, rctx->ivsg, ivsize);
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aead_givcrypt_set_tfm(subreq, ctx->child);
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aead_givcrypt_set_callback(subreq, req->base.flags,
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req->base.complete, req->base.data);
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aead_givcrypt_set_crypt(subreq, src, dst,
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req->cryptlen - ivsize, req->iv);
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aead_givcrypt_set_assoc(subreq, req->src, req->assoclen);
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aead_givcrypt_set_giv(subreq, info, be64_to_cpu(seq));
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err = crypto_aead_givencrypt(subreq);
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if (unlikely(PageHighMem(sg_page(rctx->ivsg))))
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compat_encrypt_complete2(req, err);
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return err;
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}
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static int compat_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 compat_request_ctx *rctx = aead_request_ctx(req);
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struct aead_request *subreq = &rctx->subreq.areq;
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unsigned int ivsize = crypto_aead_ivsize(geniv);
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struct scatterlist *src, *dst;
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crypto_completion_t compl;
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void *data;
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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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src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen + ivsize);
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dst = req->src == req->dst ?
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src : scatterwalk_ffwd(rctx->dst, req->dst,
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req->assoclen + ivsize);
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aead_request_set_callback(subreq, req->base.flags, compl, data);
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aead_request_set_crypt(subreq, src, dst,
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req->cryptlen - ivsize, req->iv);
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aead_request_set_assoc(subreq, req->src, req->assoclen);
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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 compat_encrypt_first(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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int err = 0;
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spin_lock_bh(&ctx->lock);
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if (geniv->encrypt != compat_encrypt_first)
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goto unlock;
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geniv->encrypt = compat_encrypt;
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unlock:
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spin_unlock_bh(&ctx->lock);
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if (err)
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return err;
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return compat_encrypt(req);
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}
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static int aead_geniv_init_compat(struct crypto_tfm *tfm)
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{
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struct crypto_aead *geniv = __crypto_aead_cast(tfm);
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
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int err;
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spin_lock_init(&ctx->lock);
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crypto_aead_set_reqsize(geniv, sizeof(struct compat_request_ctx));
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err = aead_geniv_init(tfm);
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ctx->child = geniv->child;
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geniv->child = geniv;
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return err;
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}
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static void aead_geniv_exit_compat(struct crypto_tfm *tfm)
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{
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struct crypto_aead *geniv = __crypto_aead_cast(tfm);
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struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv);
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crypto_free_aead(ctx->child);
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}
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struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
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struct rtattr **tb, u32 type, u32 mask)
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{
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@ -407,7 +594,9 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
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mask |= crypto_requires_sync(algt->type, algt->mask);
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crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
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err = crypto_grab_nivaead(spawn, name, type, mask);
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err = (algt->mask & CRYPTO_ALG_GENIV) ?
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crypto_grab_nivaead(spawn, name, type, mask) :
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crypto_grab_aead(spawn, name, type, mask);
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if (err)
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goto err_free_inst;
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@ -417,7 +606,7 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
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maxauthsize = crypto_aead_alg_maxauthsize(alg);
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err = -EINVAL;
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if (!ivsize)
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if (ivsize < sizeof(u64))
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goto err_drop_alg;
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/*
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@ -471,10 +660,20 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
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inst->alg.base.cra_priority = alg->base.cra_priority;
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inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
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inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
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inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
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inst->alg.setkey = aead_geniv_setkey;
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inst->alg.setauthsize = aead_geniv_setauthsize;
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inst->alg.ivsize = ivsize;
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inst->alg.maxauthsize = maxauthsize;
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inst->alg.encrypt = compat_encrypt_first;
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inst->alg.decrypt = compat_decrypt;
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inst->alg.base.cra_init = aead_geniv_init_compat;
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inst->alg.base.cra_exit = aead_geniv_exit_compat;
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out:
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return inst;
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24
include/crypto/internal/geniv.h
Normal file
24
include/crypto/internal/geniv.h
Normal file
@ -0,0 +1,24 @@
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/*
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* geniv: IV generation
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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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* 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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#ifndef _CRYPTO_INTERNAL_GENIV_H
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#define _CRYPTO_INTERNAL_GENIV_H
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#include <crypto/internal/aead.h>
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#include <linux/spinlock.h>
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struct aead_geniv_ctx {
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spinlock_t lock;
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struct crypto_aead *child;
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};
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#endif /* _CRYPTO_INTERNAL_GENIV_H */
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