crypto: authenc - Convert to ahash
Steffen Klassert [Wed, 5 Aug 2009 09:35:34 +0000 (19:35 +1000)]
This patch converts authenc to the new ahash interface.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/authenc.c

index 2e16ce0..4d6f49a 100644 (file)
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 
+typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags);
+
 struct authenc_instance_ctx {
-       struct crypto_spawn auth;
+       struct crypto_ahash_spawn auth;
        struct crypto_skcipher_spawn enc;
 };
 
 struct crypto_authenc_ctx {
-       spinlock_t auth_lock;
-       struct crypto_hash *auth;
+       unsigned int reqoff;
+       struct crypto_ahash *auth;
        struct crypto_ablkcipher *enc;
 };
 
+struct authenc_request_ctx {
+       unsigned int cryptlen;
+       struct scatterlist *sg;
+       struct scatterlist asg[2];
+       struct scatterlist cipher[2];
+       crypto_completion_t complete;
+       crypto_completion_t update_complete;
+       char tail[];
+};
+
 static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
                                 unsigned int keylen)
 {
        unsigned int authkeylen;
        unsigned int enckeylen;
        struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
-       struct crypto_hash *auth = ctx->auth;
+       struct crypto_ahash *auth = ctx->auth;
        struct crypto_ablkcipher *enc = ctx->enc;
        struct rtattr *rta = (void *)key;
        struct crypto_authenc_key_param *param;
@@ -64,11 +76,11 @@ static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
 
        authkeylen = keylen - enckeylen;
 
-       crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
-       crypto_hash_set_flags(auth, crypto_aead_get_flags(authenc) &
+       crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
+       crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
                                    CRYPTO_TFM_REQ_MASK);
-       err = crypto_hash_setkey(auth, key, authkeylen);
-       crypto_aead_set_flags(authenc, crypto_hash_get_flags(auth) &
+       err = crypto_ahash_setkey(auth, key, authkeylen);
+       crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &
                                       CRYPTO_TFM_RES_MASK);
 
        if (err)
@@ -103,40 +115,198 @@ static void authenc_chain(struct scatterlist *head, struct scatterlist *sg,
                sg_mark_end(head);
 }
 
-static u8 *crypto_authenc_hash(struct aead_request *req, unsigned int flags,
-                              struct scatterlist *cipher,
-                              unsigned int cryptlen)
+static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq,
+                                           int err)
+{
+       struct aead_request *req = areq->data;
+       struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+       struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
+       struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
+       struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
+
+       if (err)
+               goto out;
+
+       ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
+                               areq_ctx->cryptlen);
+       ahash_request_set_callback(ahreq, aead_request_flags(req) &
+                                         CRYPTO_TFM_REQ_MAY_SLEEP,
+                                  areq_ctx->complete, req);
+
+       err = crypto_ahash_finup(ahreq);
+       if (err)
+               goto out;
+
+       scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
+                                areq_ctx->cryptlen,
+                                crypto_aead_authsize(authenc), 1);
+
+out:
+       aead_request_complete(req, err);
+}
+
+static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
+{
+       struct aead_request *req = areq->data;
+       struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+       struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
+       struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
+       struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
+
+       if (err)
+               goto out;
+
+       scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
+                                areq_ctx->cryptlen,
+                                crypto_aead_authsize(authenc), 1);
+
+out:
+       aead_request_complete(req, err);
+}
+
+static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
+                                            int err)
 {
+       u8 *ihash;
+       unsigned int authsize;
+       struct ablkcipher_request *abreq;
+       struct aead_request *req = areq->data;
        struct crypto_aead *authenc = crypto_aead_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) & flags,
-       };
-       u8 *hash = aead_request_ctx(req);
+       struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
+       struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
+
+       if (err)
+               goto out;
+
+       ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
+                               areq_ctx->cryptlen);
+       ahash_request_set_callback(ahreq, aead_request_flags(req) &
+                                         CRYPTO_TFM_REQ_MAY_SLEEP,
+                                  areq_ctx->complete, req);
+
+       err = crypto_ahash_finup(ahreq);
+       if (err)
+               goto out;
+
+       authsize = crypto_aead_authsize(authenc);
+       ihash = ahreq->result + authsize;
+       scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
+                                authsize, 0);
+
+       err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG: 0;
+       if (err)
+               goto out;
+
+       abreq = aead_request_ctx(req);
+       ablkcipher_request_set_tfm(abreq, ctx->enc);
+       ablkcipher_request_set_callback(abreq, aead_request_flags(req),
+                                       req->base.complete, req->base.data);
+       ablkcipher_request_set_crypt(abreq, req->src, req->dst,
+                                    req->cryptlen, req->iv);
+
+       err = crypto_ablkcipher_decrypt(abreq);
+
+out:
+       aead_request_complete(req, err);
+}
+
+static void authenc_verify_ahash_done(struct crypto_async_request *areq,
+                                     int err)
+{
+       u8 *ihash;
+       unsigned int authsize;
+       struct ablkcipher_request *abreq;
+       struct aead_request *req = areq->data;
+       struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+       struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
+       struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
+       struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
+
+       if (err)
+               goto out;
+
+       authsize = crypto_aead_authsize(authenc);
+       ihash = ahreq->result + authsize;
+       scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
+                                authsize, 0);
+
+       err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG: 0;
+       if (err)
+               goto out;
+
+       abreq = aead_request_ctx(req);
+       ablkcipher_request_set_tfm(abreq, ctx->enc);
+       ablkcipher_request_set_callback(abreq, aead_request_flags(req),
+                                       req->base.complete, req->base.data);
+       ablkcipher_request_set_crypt(abreq, req->src, req->dst,
+                                    req->cryptlen, req->iv);
+
+       err = crypto_ablkcipher_decrypt(abreq);
+
+out:
+       aead_request_complete(req, err);
+}
+
+static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags)
+{
+       struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+       struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
+       struct crypto_ahash *auth = ctx->auth;
+       struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
+       struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
+       u8 *hash = areq_ctx->tail;
        int err;
 
-       hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth), 
-                          crypto_hash_alignmask(auth) + 1);
+       hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
+                           crypto_ahash_alignmask(auth) + 1);
+
+       ahash_request_set_tfm(ahreq, auth);
 
-       spin_lock_bh(&ctx->auth_lock);
-       err = crypto_hash_init(&desc);
+       err = crypto_ahash_init(ahreq);
        if (err)
-               goto auth_unlock;
+               return ERR_PTR(err);
+
+       ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen);
+       ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
+                                  areq_ctx->update_complete, req);
 
-       err = crypto_hash_update(&desc, req->assoc, req->assoclen);
+       err = crypto_ahash_update(ahreq);
        if (err)
-               goto auth_unlock;
+               return ERR_PTR(err);
+
+       ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
+                               areq_ctx->cryptlen);
+       ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
+                                  areq_ctx->complete, req);
 
-       err = crypto_hash_update(&desc, cipher, cryptlen);
+       err = crypto_ahash_finup(ahreq);
        if (err)
-               goto auth_unlock;
+               return ERR_PTR(err);
 
-       err = crypto_hash_final(&desc, hash);
-auth_unlock:
-       spin_unlock_bh(&ctx->auth_lock);
+       return hash;
+}
+
+static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags)
+{
+       struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+       struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
+       struct crypto_ahash *auth = ctx->auth;
+       struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
+       struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
+       u8 *hash = areq_ctx->tail;
+       int err;
 
+       hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
+                          crypto_ahash_alignmask(auth) + 1);
+
+       ahash_request_set_tfm(ahreq, auth);
+       ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
+                               areq_ctx->cryptlen);
+       ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
+                                  areq_ctx->complete, req);
+
+       err = crypto_ahash_digest(ahreq);
        if (err)
                return ERR_PTR(err);
 
@@ -147,11 +317,15 @@ static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
                                 unsigned int flags)
 {
        struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+       struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
        struct scatterlist *dst = req->dst;
-       struct scatterlist cipher[2];
-       struct page *dstp;
+       struct scatterlist *assoc = req->assoc;
+       struct scatterlist *cipher = areq_ctx->cipher;
+       struct scatterlist *asg = areq_ctx->asg;
        unsigned int ivsize = crypto_aead_ivsize(authenc);
-       unsigned int cryptlen;
+       unsigned int cryptlen = req->cryptlen;
+       authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
+       struct page *dstp;
        u8 *vdst;
        u8 *hash;
 
@@ -163,10 +337,25 @@ static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
                sg_set_buf(cipher, iv, ivsize);
                authenc_chain(cipher, dst, vdst == iv + ivsize);
                dst = cipher;
+               cryptlen += ivsize;
        }
 
-       cryptlen = req->cryptlen + ivsize;
-       hash = crypto_authenc_hash(req, flags, dst, cryptlen);
+       if (sg_is_last(assoc)) {
+               authenc_ahash_fn = crypto_authenc_ahash;
+               sg_init_table(asg, 2);
+               sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
+               authenc_chain(asg, dst, 0);
+               dst = asg;
+               cryptlen += req->assoclen;
+       }
+
+       areq_ctx->cryptlen = cryptlen;
+       areq_ctx->sg = dst;
+
+       areq_ctx->complete = authenc_geniv_ahash_done;
+       areq_ctx->update_complete = authenc_geniv_ahash_update_done;
+
+       hash = authenc_ahash_fn(req, flags);
        if (IS_ERR(hash))
                return PTR_ERR(hash);
 
@@ -256,22 +445,25 @@ static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
 }
 
 static int crypto_authenc_verify(struct aead_request *req,
-                                struct scatterlist *cipher,
-                                unsigned int cryptlen)
+                                authenc_ahash_t authenc_ahash_fn)
 {
        struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+       struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
        u8 *ohash;
        u8 *ihash;
        unsigned int authsize;
 
-       ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, cipher,
-                                   cryptlen);
+       areq_ctx->complete = authenc_verify_ahash_done;
+       areq_ctx->complete = authenc_verify_ahash_update_done;
+
+       ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP);
        if (IS_ERR(ohash))
                return PTR_ERR(ohash);
 
        authsize = crypto_aead_authsize(authenc);
        ihash = ohash + authsize;
-       scatterwalk_map_and_copy(ihash, cipher, cryptlen, authsize, 0);
+       scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
+                                authsize, 0);
        return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
 }
 
@@ -279,10 +471,14 @@ static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
                                  unsigned int cryptlen)
 {
        struct crypto_aead *authenc = crypto_aead_reqtfm(req);
+       struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
        struct scatterlist *src = req->src;
-       struct scatterlist cipher[2];
-       struct page *srcp;
+       struct scatterlist *assoc = req->assoc;
+       struct scatterlist *cipher = areq_ctx->cipher;
+       struct scatterlist *asg = areq_ctx->asg;
        unsigned int ivsize = crypto_aead_ivsize(authenc);
+       authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
+       struct page *srcp;
        u8 *vsrc;
 
        srcp = sg_page(src);
@@ -293,9 +489,22 @@ static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
                sg_set_buf(cipher, iv, ivsize);
                authenc_chain(cipher, src, vsrc == iv + ivsize);
                src = cipher;
+               cryptlen += ivsize;
+       }
+
+       if (sg_is_last(assoc)) {
+               authenc_ahash_fn = crypto_authenc_ahash;
+               sg_init_table(asg, 2);
+               sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
+               authenc_chain(asg, src, 0);
+               src = asg;
+               cryptlen += req->assoclen;
        }
 
-       return crypto_authenc_verify(req, src, cryptlen + ivsize);
+       areq_ctx->cryptlen = cryptlen;
+       areq_ctx->sg = src;
+
+       return crypto_authenc_verify(req, authenc_ahash_fn);
 }
 
 static int crypto_authenc_decrypt(struct aead_request *req)
@@ -326,38 +535,41 @@ static int crypto_authenc_decrypt(struct aead_request *req)
 
 static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
 {
-       struct crypto_instance *inst = (void *)tfm->__crt_alg;
+       struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
        struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
        struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
-       struct crypto_hash *auth;
+       struct crypto_ahash *auth;
        struct crypto_ablkcipher *enc;
        int err;
 
-       auth = crypto_spawn_hash(&ictx->auth);
+       auth = crypto_spawn_ahash(&ictx->auth);
        if (IS_ERR(auth))
                return PTR_ERR(auth);
 
+       ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
+                           crypto_ahash_alignmask(auth),
+                           crypto_ahash_alignmask(auth) + 1);
+
        enc = crypto_spawn_skcipher(&ictx->enc);
        err = PTR_ERR(enc);
        if (IS_ERR(enc))
-               goto err_free_hash;
+               goto err_free_ahash;
 
        ctx->auth = auth;
        ctx->enc = enc;
+       
        tfm->crt_aead.reqsize = max_t(unsigned int,
-                                     (crypto_hash_alignmask(auth) &
-                                      ~(crypto_tfm_ctx_alignment() - 1)) +
-                                     crypto_hash_digestsize(auth) * 2,
-                                     sizeof(struct skcipher_givcrypt_request) +
-                                     crypto_ablkcipher_reqsize(enc) +
-                                     crypto_ablkcipher_ivsize(enc));
-
-       spin_lock_init(&ctx->auth_lock);
+                               crypto_ahash_reqsize(auth) + ctx->reqoff +
+                               sizeof(struct authenc_request_ctx) +
+                               sizeof(struct ahash_request), 
+                               sizeof(struct skcipher_givcrypt_request) +
+                               crypto_ablkcipher_reqsize(enc) +
+                               crypto_ablkcipher_ivsize(enc));
 
        return 0;
 
-err_free_hash:
-       crypto_free_hash(auth);
+err_free_ahash:
+       crypto_free_ahash(auth);
        return err;
 }
 
@@ -365,7 +577,7 @@ static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
 {
        struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
 
-       crypto_free_hash(ctx->auth);
+       crypto_free_ahash(ctx->auth);
        crypto_free_ablkcipher(ctx->enc);
 }
 
@@ -373,7 +585,8 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
 {
        struct crypto_attr_type *algt;
        struct crypto_instance *inst;
-       struct crypto_alg *auth;
+       struct hash_alg_common *auth;
+       struct crypto_alg *auth_base;
        struct crypto_alg *enc;
        struct authenc_instance_ctx *ctx;
        const char *enc_name;
@@ -387,11 +600,13 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
        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);
+       auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
+                              CRYPTO_ALG_TYPE_AHASH_MASK);
        if (IS_ERR(auth))
                return ERR_PTR(PTR_ERR(auth));
 
+       auth_base = &auth->base;
+
        enc_name = crypto_attr_alg_name(tb[2]);
        err = PTR_ERR(enc_name);
        if (IS_ERR(enc_name))
@@ -404,7 +619,7 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
 
        ctx = crypto_instance_ctx(inst);
 
-       err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);
+       err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
        if (err)
                goto err_free_inst;
 
@@ -419,24 +634,25 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
 
        err = -ENAMETOOLONG;
        if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
-                    "authenc(%s,%s)", auth->cra_name, enc->cra_name) >=
+                    "authenc(%s,%s)", auth_base->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,
+                    "authenc(%s,%s)", auth_base->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_priority = enc->cra_priority *
+                                10 + auth_base->cra_priority;
        inst->alg.cra_blocksize = enc->cra_blocksize;
-       inst->alg.cra_alignmask = auth->cra_alignmask | enc->cra_alignmask;
+       inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
        inst->alg.cra_type = &crypto_aead_type;
 
        inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
-       inst->alg.cra_aead.maxauthsize = __crypto_shash_alg(auth)->digestsize;
+       inst->alg.cra_aead.maxauthsize = auth->digestsize;
 
        inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
 
@@ -449,13 +665,13 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
        inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
 
 out:
-       crypto_mod_put(auth);
+       crypto_mod_put(auth_base);
        return inst;
 
 err_drop_enc:
        crypto_drop_skcipher(&ctx->enc);
 err_drop_auth:
-       crypto_drop_spawn(&ctx->auth);
+       crypto_drop_ahash(&ctx->auth);
 err_free_inst:
        kfree(inst);
 out_put_auth:
@@ -468,7 +684,7 @@ static void crypto_authenc_free(struct crypto_instance *inst)
        struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
 
        crypto_drop_skcipher(&ctx->enc);
-       crypto_drop_spawn(&ctx->auth);
+       crypto_drop_ahash(&ctx->auth);
        kfree(inst);
 }