X-Git-Url: http://git.samba.org/samba.git/?a=blobdiff_plain;f=crypto%2Fauthenc.c;h=ed8ac5a6fa5ff0bc22fa67fc193a1b0629d4a063;hb=286275c90f148562b973b1e1f39f9689e6676dc4;hp=126a529b496d5df32959499ff22739767eca52a3;hpb=8c27eba54970c6ebbb408186e5baa2274435e869;p=sfrench%2Fcifs-2.6.git

diff --git a/crypto/authenc.c b/crypto/authenc.c
index 126a529b496d..ed8ac5a6fa5f 100644
--- a/crypto/authenc.c
+++ b/crypto/authenc.c
@@ -10,22 +10,21 @@
  *
  */
 
-#include <crypto/algapi.h>
+#include <crypto/aead.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/authenc.h>
+#include <crypto/scatterwalk.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/rtnetlink.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 
-#include "scatterwalk.h"
-
 struct authenc_instance_ctx {
 	struct crypto_spawn auth;
-	struct crypto_spawn enc;
-
-	unsigned int authsize;
-	unsigned int enckeylen;
+	struct crypto_skcipher_spawn enc;
 };
 
 struct crypto_authenc_ctx {
@@ -37,19 +36,31 @@ struct crypto_authenc_ctx {
 static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
 				 unsigned int keylen)
 {
-	struct authenc_instance_ctx *ictx =
-		crypto_instance_ctx(crypto_aead_alg_instance(authenc));
-	unsigned int enckeylen = ictx->enckeylen;
 	unsigned int authkeylen;
+	unsigned int enckeylen;
 	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
 	struct crypto_hash *auth = ctx->auth;
 	struct crypto_ablkcipher *enc = ctx->enc;
+	struct rtattr *rta = (void *)key;
+	struct crypto_authenc_key_param *param;
 	int err = -EINVAL;
 
-	if (keylen < enckeylen) {
-		crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
-		goto out;
-	}
+	if (!RTA_OK(rta, keylen))
+		goto badkey;
+	if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
+		goto badkey;
+	if (RTA_PAYLOAD(rta) < sizeof(*param))
+		goto badkey;
+
+	param = RTA_DATA(rta);
+	enckeylen = be32_to_cpu(param->enckeylen);
+
+	key += RTA_ALIGN(rta->rta_len);
+	keylen -= RTA_ALIGN(rta->rta_len);
+
+	if (keylen < enckeylen)
+		goto badkey;
+
 	authkeylen = keylen - enckeylen;
 
 	crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
@@ -71,21 +82,38 @@ static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
 
 out:
 	return err;
+
+badkey:
+	crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
+	goto out;
 }
 
-static int crypto_authenc_hash(struct aead_request *req)
+static void authenc_chain(struct scatterlist *head, struct scatterlist *sg,
+			  int chain)
+{
+	if (chain) {
+		head->length += sg->length;
+		sg = scatterwalk_sg_next(sg);
+	}
+
+	if (sg)
+		scatterwalk_sg_chain(head, 2, sg);
+	else
+		sg_mark_end(head);
+}
+
+static u8 *crypto_authenc_hash(struct aead_request *req, unsigned int flags,
+			       struct scatterlist *cipher,
+			       unsigned int cryptlen)
 {
 	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
-	struct authenc_instance_ctx *ictx =
-		crypto_instance_ctx(crypto_aead_alg_instance(authenc));
 	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
 	struct crypto_hash *auth = ctx->auth;
 	struct hash_desc desc = {
 		.tfm = auth,
+		.flags = aead_request_flags(req) & flags,
 	};
 	u8 *hash = aead_request_ctx(req);
-	struct scatterlist *dst = req->dst;
-	unsigned int cryptlen = req->cryptlen;
 	int err;
 
 	hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth), 
@@ -100,7 +128,7 @@ static int crypto_authenc_hash(struct aead_request *req)
 	if (err)
 		goto auth_unlock;
 
-	err = crypto_hash_update(&desc, dst, cryptlen);
+	err = crypto_hash_update(&desc, cipher, cryptlen);
 	if (err)
 		goto auth_unlock;
 
@@ -109,17 +137,53 @@ auth_unlock:
 	spin_unlock_bh(&ctx->auth_lock);
 
 	if (err)
-		return err;
+		return ERR_PTR(err);
+
+	return hash;
+}
 
-	scatterwalk_map_and_copy(hash, dst, cryptlen, ictx->authsize, 1);
+static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
+				 unsigned int flags)
+{
+	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+	struct scatterlist *dst = req->dst;
+	struct scatterlist cipher[2];
+	struct page *dstp;
+	unsigned int ivsize = crypto_aead_ivsize(authenc);
+	unsigned int cryptlen;
+	u8 *vdst;
+	u8 *hash;
+
+	dstp = sg_page(dst);
+	vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
+
+	sg_init_table(cipher, 2);
+	sg_set_buf(cipher, iv, ivsize);
+	authenc_chain(cipher, dst, vdst == iv + ivsize);
+
+	cryptlen = req->cryptlen + ivsize;
+	hash = crypto_authenc_hash(req, flags, cipher, cryptlen);
+	if (IS_ERR(hash))
+		return PTR_ERR(hash);
+
+	scatterwalk_map_and_copy(hash, cipher, cryptlen,
+				 crypto_aead_authsize(authenc), 1);
 	return 0;
 }
 
 static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
 					int err)
 {
-	if (!err)
-		err = crypto_authenc_hash(req->data);
+	if (!err) {
+		struct aead_request *areq = req->data;
+		struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
+		struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
+		struct ablkcipher_request *abreq = aead_request_ctx(areq);
+		u8 *iv = (u8 *)(abreq + 1) +
+			 crypto_ablkcipher_reqsize(ctx->enc);
+
+		err = crypto_authenc_genicv(areq, iv, 0);
+	}
 
 	aead_request_complete(req->data, err);
 }
@@ -129,72 +193,99 @@ static int crypto_authenc_encrypt(struct aead_request *req)
 	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
 	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
 	struct ablkcipher_request *abreq = aead_request_ctx(req);
+	struct crypto_ablkcipher *enc = ctx->enc;
+	struct scatterlist *dst = req->dst;
+	unsigned int cryptlen = req->cryptlen;
+	u8 *iv = (u8 *)(abreq + 1) + crypto_ablkcipher_reqsize(enc);
 	int err;
 
-	ablkcipher_request_set_tfm(abreq, ctx->enc);
+	ablkcipher_request_set_tfm(abreq, enc);
 	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
 					crypto_authenc_encrypt_done, req);
-	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
-				     req->iv);
+	ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
+
+	memcpy(iv, req->iv, crypto_aead_ivsize(authenc));
 
 	err = crypto_ablkcipher_encrypt(abreq);
 	if (err)
 		return err;
 
-	return crypto_authenc_hash(req);
+	return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
 }
 
-static int crypto_authenc_verify(struct aead_request *req)
+static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
+					   int err)
 {
-	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
-	struct authenc_instance_ctx *ictx =
-		crypto_instance_ctx(crypto_aead_alg_instance(authenc));
+	if (!err) {
+		struct aead_givcrypt_request *greq = req->data;
+
+		err = crypto_authenc_genicv(&greq->areq, greq->giv, 0);
+	}
+
+	aead_request_complete(req->data, err);
+}
+
+static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
+{
+	struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
 	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
-	struct crypto_hash *auth = ctx->auth;
-	struct hash_desc desc = {
-		.tfm = auth,
-		.flags = aead_request_flags(req),
-	};
-	u8 *ohash = aead_request_ctx(req);
-	u8 *ihash;
-	struct scatterlist *src = req->src;
-	unsigned int cryptlen = req->cryptlen;
-	unsigned int authsize;
+	struct aead_request *areq = &req->areq;
+	struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
+	u8 *iv = req->giv;
 	int err;
 
-	ohash = (u8 *)ALIGN((unsigned long)ohash + crypto_hash_alignmask(auth), 
-			    crypto_hash_alignmask(auth) + 1);
-	ihash = ohash + crypto_hash_digestsize(auth);
-
-	spin_lock_bh(&ctx->auth_lock);
-	err = crypto_hash_init(&desc);
-	if (err)
-		goto auth_unlock;
+	skcipher_givcrypt_set_tfm(greq, ctx->enc);
+	skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
+				       crypto_authenc_givencrypt_done, areq);
+	skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
+				    areq->iv);
+	skcipher_givcrypt_set_giv(greq, iv, req->seq);
 
-	err = crypto_hash_update(&desc, req->assoc, req->assoclen);
+	err = crypto_skcipher_givencrypt(greq);
 	if (err)
-		goto auth_unlock;
+		return err;
 
-	err = crypto_hash_update(&desc, src, cryptlen);
-	if (err)
-		goto auth_unlock;
+	return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
+}
 
-	err = crypto_hash_final(&desc, ohash);
-auth_unlock:
-	spin_unlock_bh(&ctx->auth_lock);
+static int crypto_authenc_verify(struct aead_request *req,
+				 struct scatterlist *cipher,
+				 unsigned int cryptlen)
+{
+	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+	u8 *ohash;
+	u8 *ihash;
+	unsigned int authsize;
 
-	if (err)
-		return err;
+	ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, cipher,
+				    cryptlen);
+	if (IS_ERR(ohash))
+		return PTR_ERR(ohash);
 
-	authsize = ictx->authsize;
-	scatterwalk_map_and_copy(ihash, src, cryptlen, authsize, 0);
-	return memcmp(ihash, ohash, authsize) ? -EINVAL : 0;
+	authsize = crypto_aead_authsize(authenc);
+	ihash = ohash + authsize;
+	scatterwalk_map_and_copy(ihash, cipher, cryptlen, authsize, 0);
+	return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
 }
 
-static void crypto_authenc_decrypt_done(struct crypto_async_request *req,
-					int err)
+static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
+				  unsigned int cryptlen)
 {
-	aead_request_complete(req->data, err);
+	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+	struct scatterlist *src = req->src;
+	struct scatterlist cipher[2];
+	struct page *srcp;
+	unsigned int ivsize = crypto_aead_ivsize(authenc);
+	u8 *vsrc;
+
+	srcp = sg_page(src);
+	vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
+
+	sg_init_table(cipher, 2);
+	sg_set_buf(cipher, iv, ivsize);
+	authenc_chain(cipher, src, vsrc == iv + ivsize);
+
+	return crypto_authenc_verify(req, cipher, cryptlen + ivsize);
 }
 
 static int crypto_authenc_decrypt(struct aead_request *req)
@@ -202,17 +293,23 @@ static int crypto_authenc_decrypt(struct aead_request *req)
 	struct crypto_aead *authenc = crypto_aead_reqtfm(req);
 	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
 	struct ablkcipher_request *abreq = aead_request_ctx(req);
+	unsigned int cryptlen = req->cryptlen;
+	unsigned int authsize = crypto_aead_authsize(authenc);
+	u8 *iv = req->iv;
 	int err;
 
-	err = crypto_authenc_verify(req);
+	if (cryptlen < authsize)
+		return -EINVAL;
+	cryptlen -= authsize;
+
+	err = crypto_authenc_iverify(req, iv, cryptlen);
 	if (err)
 		return err;
 
 	ablkcipher_request_set_tfm(abreq, ctx->enc);
 	ablkcipher_request_set_callback(abreq, aead_request_flags(req),
-					crypto_authenc_decrypt_done, req);
-	ablkcipher_request_set_crypt(abreq, req->src, req->dst, req->cryptlen,
-				     req->iv);
+					req->base.complete, req->base.data);
+	ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
 
 	return crypto_ablkcipher_decrypt(abreq);
 }
@@ -224,19 +321,13 @@ static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
 	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
 	struct crypto_hash *auth;
 	struct crypto_ablkcipher *enc;
-	unsigned int digestsize;
 	int err;
 
 	auth = crypto_spawn_hash(&ictx->auth);
 	if (IS_ERR(auth))
 		return PTR_ERR(auth);
 
-	err = -EINVAL;
-	digestsize = crypto_hash_digestsize(auth);
-	if (ictx->authsize > digestsize)
-		goto err_free_hash;
-
-	enc = crypto_spawn_ablkcipher(&ictx->enc);
+	enc = crypto_spawn_skcipher(&ictx->enc);
 	err = PTR_ERR(enc);
 	if (IS_ERR(enc))
 		goto err_free_hash;
@@ -246,9 +337,10 @@ static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
 	tfm->crt_aead.reqsize = max_t(unsigned int,
 				      (crypto_hash_alignmask(auth) &
 				       ~(crypto_tfm_ctx_alignment() - 1)) +
-				      digestsize * 2,
-				      sizeof(struct ablkcipher_request) +
-				      crypto_ablkcipher_reqsize(enc));
+				      crypto_hash_digestsize(auth) * 2,
+				      sizeof(struct skcipher_givcrypt_request) +
+				      crypto_ablkcipher_reqsize(enc) +
+				      crypto_ablkcipher_ivsize(enc));
 
 	spin_lock_init(&ctx->auth_lock);
 
@@ -269,75 +361,74 @@ static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
 
 static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
 {
+	struct crypto_attr_type *algt;
 	struct crypto_instance *inst;
 	struct crypto_alg *auth;
 	struct crypto_alg *enc;
 	struct authenc_instance_ctx *ctx;
-	unsigned int authsize;
-	unsigned int enckeylen;
+	const char *enc_name;
 	int err;
 
-	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD);
-	if (err)
+	algt = crypto_get_attr_type(tb);
+	err = PTR_ERR(algt);
+	if (IS_ERR(algt))
 		return ERR_PTR(err);
 
+	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
+		return ERR_PTR(-EINVAL);
+
 	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
 			       CRYPTO_ALG_TYPE_HASH_MASK);
 	if (IS_ERR(auth))
 		return ERR_PTR(PTR_ERR(auth));
 
-	err = crypto_attr_u32(tb[2], &authsize);
-	inst = ERR_PTR(err);
-	if (err)
-		goto out_put_auth;
-
-	enc = crypto_attr_alg(tb[3], CRYPTO_ALG_TYPE_BLKCIPHER,
-			      CRYPTO_ALG_TYPE_MASK);
-	inst = ERR_PTR(PTR_ERR(enc));
-	if (IS_ERR(enc))
+	enc_name = crypto_attr_alg_name(tb[2]);
+	err = PTR_ERR(enc_name);
+	if (IS_ERR(enc_name))
 		goto out_put_auth;
 
-	err = crypto_attr_u32(tb[4], &enckeylen);
-	if (err)
-		goto out_put_enc;
-
 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
 	err = -ENOMEM;
 	if (!inst)
-		goto out_put_enc;
-
-	err = -ENAMETOOLONG;
-	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
-		     "authenc(%s,%u,%s,%u)", auth->cra_name, authsize,
-		     enc->cra_name, enckeylen) >= CRYPTO_MAX_ALG_NAME)
-		goto err_free_inst;
-
-	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
-		     "authenc(%s,%u,%s,%u)", auth->cra_driver_name,
-		     authsize, enc->cra_driver_name, enckeylen) >=
-	    CRYPTO_MAX_ALG_NAME)
-		goto err_free_inst;
+		goto out_put_auth;
 
 	ctx = crypto_instance_ctx(inst);
-	ctx->authsize = authsize;
-	ctx->enckeylen = enckeylen;
 
 	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
 	if (err)
 		goto err_free_inst;
 
-	err = crypto_init_spawn(&ctx->enc, enc, inst, CRYPTO_ALG_TYPE_MASK);
+	crypto_set_skcipher_spawn(&ctx->enc, inst);
+	err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
+				   crypto_requires_sync(algt->type,
+							algt->mask));
 	if (err)
 		goto err_drop_auth;
 
-	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
+	enc = crypto_skcipher_spawn_alg(&ctx->enc);
+
+	err = -ENAMETOOLONG;
+	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
+		     "authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
+	    CRYPTO_MAX_ALG_NAME)
+		goto err_drop_enc;
+
+	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+		     "authenc(%s,%s)", auth->cra_driver_name,
+		     enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
+		goto err_drop_enc;
+
+	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
+	inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
 	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;
 	inst->alg.cra_blocksize = enc->cra_blocksize;
-	inst->alg.cra_alignmask = max(auth->cra_alignmask, enc->cra_alignmask);
+	inst->alg.cra_alignmask = auth->cra_alignmask | enc->cra_alignmask;
 	inst->alg.cra_type = &crypto_aead_type;
 
-	inst->alg.cra_aead.ivsize = enc->cra_blkcipher.ivsize;
-	inst->alg.cra_aead.authsize = authsize;
+	inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
+	inst->alg.cra_aead.maxauthsize = auth->cra_type == &crypto_hash_type ?
+					 auth->cra_hash.digestsize :
+					 auth->cra_digest.dia_digestsize;
 
 	inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
 
@@ -347,18 +438,19 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
 	inst->alg.cra_aead.setkey = crypto_authenc_setkey;
 	inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
 	inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
+	inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
 
 out:
-	crypto_mod_put(enc);
-out_put_auth:
 	crypto_mod_put(auth);
 	return inst;
 
+err_drop_enc:
+	crypto_drop_skcipher(&ctx->enc);
 err_drop_auth:
 	crypto_drop_spawn(&ctx->auth);
 err_free_inst:
 	kfree(inst);
-out_put_enc:
+out_put_auth:
 	inst = ERR_PTR(err);
 	goto out;
 }
@@ -367,7 +459,7 @@ static void crypto_authenc_free(struct crypto_instance *inst)
 {
 	struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
 
-	crypto_drop_spawn(&ctx->enc);
+	crypto_drop_skcipher(&ctx->enc);
 	crypto_drop_spawn(&ctx->auth);
 	kfree(inst);
 }