From: Steffen Klassert Subject: [RFC] [PATCH 3/5] eseqiv: Add support for aead algorithms Date: Mon, 8 Jun 2009 09:10:46 +0200 Message-ID: <20090608071046.GU20366@secunet.com> References: <20090608070749.GR20366@secunet.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: David Miller , linux-crypto@vger.kernel.org To: Herbert Xu Return-path: Received: from a.mx.secunet.com ([213.68.205.161]:58230 "EHLO a.mx.secunet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750705AbZFHHIT (ORCPT ); Mon, 8 Jun 2009 03:08:19 -0400 Content-Disposition: inline In-Reply-To: <20090608070749.GR20366@secunet.com> Sender: linux-crypto-owner@vger.kernel.org List-ID: This adds eseqiv support for aead algorithms, this is usefull for aead algorithms that need eseqiv as it's default IV generator. Signed-off-by: Steffen Klassert --- crypto/eseqiv.c | 244 +++++++++++++++++++++++++++++++++++++++++++++--- include/linux/crypto.h | 1 + 2 files changed, 232 insertions(+), 13 deletions(-) diff --git a/crypto/eseqiv.c b/crypto/eseqiv.c index 3ca3b66..04a8bba 100644 --- a/crypto/eseqiv.c +++ b/crypto/eseqiv.c @@ -15,6 +15,7 @@ * */ +#include #include #include #include @@ -62,6 +63,29 @@ out: skcipher_givcrypt_complete(req, err); } +static void eseqiv_aead_complete2(struct aead_givcrypt_request *req) +{ + struct crypto_aead *geniv = aead_givcrypt_reqtfm(req); + struct eseqiv_request_ctx *reqctx = aead_givcrypt_reqctx(req); + + memcpy(req->giv, PTR_ALIGN((u8 *)reqctx->tail, + crypto_aead_alignmask(geniv) + 1), + crypto_aead_ivsize(geniv)); +} + +static void eseqiv_aead_complete(struct crypto_async_request *base, int err) +{ + struct aead_givcrypt_request *req = base->data; + + if (err) + goto out; + + eseqiv_aead_complete2(req); + +out: + aead_givcrypt_complete(req, err); +} + static void eseqiv_chain(struct scatterlist *head, struct scatterlist *sg, int chain) { @@ -155,6 +179,90 @@ static int eseqiv_givencrypt(struct skcipher_givcrypt_request *req) if (giv != req->giv) eseqiv_complete2(req); +out: + return err; +} + +static int eseqiv_aead_givencrypt(struct aead_givcrypt_request *req) +{ + struct crypto_aead *geniv = aead_givcrypt_reqtfm(req); + struct eseqiv_ctx *ctx = crypto_aead_ctx(geniv); + struct eseqiv_request_ctx *reqctx = aead_givcrypt_reqctx(req); + struct aead_request *subreq; + crypto_completion_t complete; + void *data; + struct scatterlist *osrc, *odst; + struct scatterlist *dst; + struct page *srcp; + struct page *dstp; + u8 *giv; + u8 *vsrc; + u8 *vdst; + __be64 seq; + unsigned int ivsize; + unsigned int len; + unsigned int flags; + int err; + + subreq = (void *)(reqctx->tail + ctx->reqoff); + aead_request_set_tfm(subreq, aead_geniv_base(geniv)); + + giv = req->giv; + complete = req->areq.base.complete; + data = req->areq.base.data; + + osrc = req->areq.src; + odst = req->areq.dst; + srcp = sg_page(osrc); + dstp = sg_page(odst); + vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + osrc->offset; + vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + odst->offset; + + ivsize = crypto_aead_ivsize(geniv); + flags = req->areq.base.flags | CRYPTO_TFM_REQ_SG_HAS_IV; + + if (vsrc != giv + ivsize && vdst != giv + ivsize) { + giv = PTR_ALIGN((u8 *)reqctx->tail, + crypto_aead_alignmask(geniv) + 1); + complete = eseqiv_aead_complete; + data = req; + } + + aead_request_set_callback(subreq, flags, complete, data); + + sg_init_table(reqctx->src, 2); + sg_set_buf(reqctx->src, giv, ivsize); + eseqiv_chain(reqctx->src, osrc, vsrc == giv + ivsize); + + dst = reqctx->src; + if (osrc != odst) { + sg_init_table(reqctx->dst, 2); + sg_set_buf(reqctx->dst, giv, ivsize); + eseqiv_chain(reqctx->dst, odst, vdst == giv + ivsize); + + dst = reqctx->dst; + } + + aead_request_set_crypt(subreq, reqctx->src, dst, + req->areq.cryptlen + ivsize, req->areq.iv); + aead_request_set_assoc(subreq, req->areq.assoc, req->areq.assoclen); + + memcpy(req->areq.iv, ctx->salt, ivsize); + + len = ivsize; + if (ivsize > sizeof(u64)) { + memset(req->giv, 0, ivsize - sizeof(u64)); + len = sizeof(u64); + } + seq = cpu_to_be64(req->seq); + memcpy(req->giv + ivsize - len, &seq, len); + + err = crypto_aead_encrypt(subreq); + if (err) + goto out; + + if (giv != req->giv) + eseqiv_aead_complete2(req); out: return err; @@ -183,6 +291,29 @@ unlock: return eseqiv_givencrypt(req); } +static int eseqiv_aead_givencrypt_first(struct aead_givcrypt_request *req) +{ + struct crypto_aead *geniv = aead_givcrypt_reqtfm(req); + struct eseqiv_ctx *ctx = crypto_aead_ctx(geniv); + int err = 0; + + spin_lock_bh(&ctx->lock); + if (crypto_aead_crt(geniv)->givencrypt != eseqiv_aead_givencrypt_first) + goto unlock; + + crypto_aead_crt(geniv)->givencrypt = eseqiv_aead_givencrypt; + err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, + crypto_aead_ivsize(geniv)); + +unlock: + spin_unlock_bh(&ctx->lock); + + if (err) + return err; + + return eseqiv_aead_givencrypt(req); +} + static int eseqiv_init(struct crypto_tfm *tfm) { struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm); @@ -215,20 +346,47 @@ static int eseqiv_init(struct crypto_tfm *tfm) return skcipher_geniv_init(tfm); } +static int eseqiv_aead_init(struct crypto_tfm *tfm) +{ + struct crypto_aead *geniv = __crypto_aead_cast(tfm); + struct eseqiv_ctx *ctx = crypto_aead_ctx(geniv); + unsigned long alignmask; + unsigned int reqsize; + + spin_lock_init(&ctx->lock); + + alignmask = crypto_tfm_ctx_alignment() - 1; + reqsize = sizeof(struct eseqiv_request_ctx); + + if (alignmask & reqsize) { + alignmask &= reqsize; + alignmask--; + } + + alignmask = ~alignmask; + alignmask &= crypto_aead_alignmask(geniv); + + reqsize += alignmask; + reqsize += crypto_aead_ivsize(geniv); + reqsize = ALIGN(reqsize, crypto_tfm_ctx_alignment()); + + ctx->reqoff = reqsize - sizeof(struct eseqiv_request_ctx); + + tfm->crt_aead.reqsize = reqsize + sizeof(struct aead_request); + + return aead_geniv_init(tfm); +} + static struct crypto_template eseqiv_tmpl; -static struct crypto_instance *eseqiv_alloc(struct rtattr **tb) +static struct crypto_instance *eseqiv_ablkcipher_alloc(struct rtattr **tb) { - struct crypto_instance *inst; int err; - - err = crypto_get_default_rng(); - if (err) - return ERR_PTR(err); + struct crypto_instance *inst; inst = skcipher_geniv_alloc(&eseqiv_tmpl, tb, 0, 0); if (IS_ERR(inst)) - goto put_rng; + goto out; err = -EINVAL; if (inst->alg.cra_ablkcipher.ivsize != inst->alg.cra_blocksize) @@ -236,18 +394,75 @@ static struct crypto_instance *eseqiv_alloc(struct rtattr **tb) inst->alg.cra_ablkcipher.givencrypt = eseqiv_givencrypt_first; - inst->alg.cra_init = eseqiv_init; - inst->alg.cra_exit = skcipher_geniv_exit; + inst->alg.cra_init = eseqiv_init; + inst->alg.cra_exit = skcipher_geniv_exit; - inst->alg.cra_ctxsize = sizeof(struct eseqiv_ctx); - inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize; + inst->alg.cra_ctxsize = inst->alg.cra_ablkcipher.ivsize; out: return inst; free_inst: skcipher_geniv_free(inst); - inst = ERR_PTR(err); + return ERR_PTR(err); +} + +static struct crypto_instance *eseqiv_aead_alloc(struct rtattr **tb) +{ + int err; + struct crypto_instance *inst; + + inst = aead_geniv_alloc(&eseqiv_tmpl, tb, 0, 0); + if (IS_ERR(inst)) + goto out; + + err = -EINVAL; + if (inst->alg.cra_aead.ivsize != inst->alg.cra_blocksize) + goto free_inst; + + inst->alg.cra_aead.givencrypt = eseqiv_aead_givencrypt_first; + + inst->alg.cra_init = eseqiv_aead_init; + inst->alg.cra_exit = aead_geniv_exit; + + inst->alg.cra_ctxsize = inst->alg.cra_aead.ivsize; + +out: + return inst; + +free_inst: + aead_geniv_free(inst); + return ERR_PTR(err); +} + +static struct crypto_instance *eseqiv_alloc(struct rtattr **tb) +{ + struct crypto_attr_type *algt; + struct crypto_instance *inst; + int err; + + algt = crypto_get_attr_type(tb); + err = PTR_ERR(algt); + if (IS_ERR(algt)) + return ERR_PTR(err); + + err = crypto_get_default_rng(); + if (err) + return ERR_PTR(err); + + if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) + inst = eseqiv_ablkcipher_alloc(tb); + else + inst = eseqiv_aead_alloc(tb); + + if (IS_ERR(inst)) + goto put_rng; + + inst->alg.cra_ctxsize += sizeof(struct eseqiv_ctx); + +out: + return inst; + put_rng: crypto_put_default_rng(); goto out; @@ -255,7 +470,10 @@ put_rng: static void eseqiv_free(struct crypto_instance *inst) { - skcipher_geniv_free(inst); + if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) + skcipher_geniv_free(inst); + else + aead_geniv_free(inst); crypto_put_default_rng(); } diff --git a/include/linux/crypto.h b/include/linux/crypto.h index ec29fa2..1af50e6 100644 --- a/include/linux/crypto.h +++ b/include/linux/crypto.h @@ -80,6 +80,7 @@ #define CRYPTO_TFM_REQ_WEAK_KEY 0x00000100 #define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200 #define CRYPTO_TFM_REQ_MAY_BACKLOG 0x00000400 +#define CRYPTO_TFM_REQ_SG_HAS_IV 0x00000800 #define CRYPTO_TFM_RES_WEAK_KEY 0x00100000 #define CRYPTO_TFM_RES_BAD_KEY_LEN 0x00200000 #define CRYPTO_TFM_RES_BAD_KEY_SCHED 0x00400000 -- 1.5.4.2