forked from Minki/linux
crypto: gcm - Use skcipher
This patch converts gcm to use the new skcipher interface as opposed to ablkcipher. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
464b93a3c7
commit
16f37ecdd0
109
crypto/gcm.c
109
crypto/gcm.c
@ -29,7 +29,7 @@ struct gcm_instance_ctx {
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};
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struct crypto_gcm_ctx {
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struct crypto_ablkcipher *ctr;
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struct crypto_skcipher *ctr;
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struct crypto_ahash *ghash;
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};
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@ -50,7 +50,7 @@ struct crypto_rfc4543_instance_ctx {
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struct crypto_rfc4543_ctx {
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struct crypto_aead *child;
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struct crypto_blkcipher *null;
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struct crypto_skcipher *null;
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u8 nonce[4];
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};
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@ -74,7 +74,7 @@ struct crypto_gcm_req_priv_ctx {
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struct crypto_gcm_ghash_ctx ghash_ctx;
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union {
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struct ahash_request ahreq;
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struct ablkcipher_request abreq;
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struct skcipher_request skreq;
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} u;
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};
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@ -114,7 +114,7 @@ static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
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{
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struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
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struct crypto_ahash *ghash = ctx->ghash;
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struct crypto_ablkcipher *ctr = ctx->ctr;
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struct crypto_skcipher *ctr = ctx->ctr;
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struct {
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be128 hash;
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u8 iv[8];
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@ -122,35 +122,35 @@ static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
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struct crypto_gcm_setkey_result result;
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struct scatterlist sg[1];
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struct ablkcipher_request req;
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struct skcipher_request req;
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} *data;
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int err;
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crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
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crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_ablkcipher_setkey(ctr, key, keylen);
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crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
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crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
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crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
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CRYPTO_TFM_REQ_MASK);
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err = crypto_skcipher_setkey(ctr, key, keylen);
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crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
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CRYPTO_TFM_RES_MASK);
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if (err)
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return err;
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data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
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data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
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GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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init_completion(&data->result.completion);
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sg_init_one(data->sg, &data->hash, sizeof(data->hash));
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ablkcipher_request_set_tfm(&data->req, ctr);
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ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
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CRYPTO_TFM_REQ_MAY_BACKLOG,
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crypto_gcm_setkey_done,
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&data->result);
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ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
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sizeof(data->hash), data->iv);
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skcipher_request_set_tfm(&data->req, ctr);
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skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
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CRYPTO_TFM_REQ_MAY_BACKLOG,
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crypto_gcm_setkey_done,
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&data->result);
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skcipher_request_set_crypt(&data->req, data->sg, data->sg,
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sizeof(data->hash), data->iv);
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err = crypto_ablkcipher_encrypt(&data->req);
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err = crypto_skcipher_encrypt(&data->req);
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if (err == -EINPROGRESS || err == -EBUSY) {
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err = wait_for_completion_interruptible(
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&data->result.completion);
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@ -223,13 +223,13 @@ static void crypto_gcm_init_crypt(struct aead_request *req,
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struct crypto_aead *aead = crypto_aead_reqtfm(req);
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struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct ablkcipher_request *ablk_req = &pctx->u.abreq;
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struct skcipher_request *skreq = &pctx->u.skreq;
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struct scatterlist *dst;
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dst = req->src == req->dst ? pctx->src : pctx->dst;
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ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
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ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
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skcipher_request_set_tfm(skreq, ctx->ctr);
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skcipher_request_set_crypt(skreq, pctx->src, dst,
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cryptlen + sizeof(pctx->auth_tag),
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pctx->iv);
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}
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@ -494,14 +494,14 @@ out:
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static int crypto_gcm_encrypt(struct aead_request *req)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct ablkcipher_request *abreq = &pctx->u.abreq;
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struct skcipher_request *skreq = &pctx->u.skreq;
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u32 flags = aead_request_flags(req);
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crypto_gcm_init_common(req);
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crypto_gcm_init_crypt(req, req->cryptlen);
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ablkcipher_request_set_callback(abreq, flags, gcm_encrypt_done, req);
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skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
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return crypto_ablkcipher_encrypt(abreq) ?:
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return crypto_skcipher_encrypt(skreq) ?:
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gcm_encrypt_continue(req, flags);
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}
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@ -533,12 +533,12 @@ static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
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static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
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{
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struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
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struct ablkcipher_request *abreq = &pctx->u.abreq;
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struct skcipher_request *skreq = &pctx->u.skreq;
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struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
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crypto_gcm_init_crypt(req, gctx->cryptlen);
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ablkcipher_request_set_callback(abreq, flags, gcm_decrypt_done, req);
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return crypto_ablkcipher_decrypt(abreq) ?: crypto_gcm_verify(req);
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skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
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return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
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}
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static int crypto_gcm_decrypt(struct aead_request *req)
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@ -566,7 +566,7 @@ static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
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struct aead_instance *inst = aead_alg_instance(tfm);
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struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
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struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
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struct crypto_ablkcipher *ctr;
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struct crypto_skcipher *ctr;
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struct crypto_ahash *ghash;
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unsigned long align;
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int err;
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@ -575,7 +575,7 @@ static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
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if (IS_ERR(ghash))
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return PTR_ERR(ghash);
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ctr = crypto_spawn_skcipher(&ictx->ctr);
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ctr = crypto_spawn_skcipher2(&ictx->ctr);
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err = PTR_ERR(ctr);
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if (IS_ERR(ctr))
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goto err_free_hash;
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@ -587,8 +587,8 @@ static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
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align &= ~(crypto_tfm_ctx_alignment() - 1);
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crypto_aead_set_reqsize(tfm,
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align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
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max(sizeof(struct ablkcipher_request) +
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crypto_ablkcipher_reqsize(ctr),
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max(sizeof(struct skcipher_request) +
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crypto_skcipher_reqsize(ctr),
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sizeof(struct ahash_request) +
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crypto_ahash_reqsize(ghash)));
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@ -604,7 +604,7 @@ static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
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struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
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crypto_free_ahash(ctx->ghash);
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crypto_free_ablkcipher(ctx->ctr);
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crypto_free_skcipher(ctx->ctr);
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}
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static void crypto_gcm_free(struct aead_instance *inst)
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@ -624,7 +624,7 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
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{
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struct crypto_attr_type *algt;
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struct aead_instance *inst;
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struct crypto_alg *ctr;
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struct skcipher_alg *ctr;
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struct crypto_alg *ghash_alg;
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struct hash_alg_common *ghash;
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struct gcm_instance_ctx *ctx;
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@ -663,41 +663,42 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
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goto err_drop_ghash;
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crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
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err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
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crypto_requires_sync(algt->type,
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algt->mask));
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err = crypto_grab_skcipher2(&ctx->ctr, ctr_name, 0,
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crypto_requires_sync(algt->type,
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algt->mask));
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if (err)
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goto err_drop_ghash;
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ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
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ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
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/* We only support 16-byte blocks. */
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if (ctr->cra_ablkcipher.ivsize != 16)
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if (crypto_skcipher_alg_ivsize(ctr) != 16)
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goto out_put_ctr;
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/* Not a stream cipher? */
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err = -EINVAL;
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if (ctr->cra_blocksize != 1)
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if (ctr->base.cra_blocksize != 1)
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goto out_put_ctr;
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"gcm_base(%s,%s)", ctr->cra_driver_name,
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"gcm_base(%s,%s)", ctr->base.cra_driver_name,
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ghash_alg->cra_driver_name) >=
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CRYPTO_MAX_ALG_NAME)
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goto out_put_ctr;
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memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
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inst->alg.base.cra_flags = (ghash->base.cra_flags | ctr->cra_flags) &
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CRYPTO_ALG_ASYNC;
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inst->alg.base.cra_flags = (ghash->base.cra_flags |
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ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
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inst->alg.base.cra_priority = (ghash->base.cra_priority +
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ctr->cra_priority) / 2;
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ctr->base.cra_priority) / 2;
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inst->alg.base.cra_blocksize = 1;
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inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
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ctr->cra_alignmask;
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ctr->base.cra_alignmask;
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inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
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inst->alg.ivsize = 12;
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inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
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inst->alg.maxauthsize = 16;
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inst->alg.init = crypto_gcm_init_tfm;
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inst->alg.exit = crypto_gcm_exit_tfm;
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@ -982,6 +983,7 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl,
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inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
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inst->alg.ivsize = 8;
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inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
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inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
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inst->alg.init = crypto_rfc4106_init_tfm;
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@ -1086,11 +1088,13 @@ static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
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unsigned int authsize = crypto_aead_authsize(aead);
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unsigned int nbytes = req->assoclen + req->cryptlen -
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(enc ? 0 : authsize);
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struct blkcipher_desc desc = {
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.tfm = ctx->null,
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};
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SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
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return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
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skcipher_request_set_tfm(nreq, ctx->null);
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skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
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skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
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return crypto_skcipher_encrypt(nreq);
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}
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static int crypto_rfc4543_encrypt(struct aead_request *req)
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@ -1110,7 +1114,7 @@ static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
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struct crypto_aead_spawn *spawn = &ictx->aead;
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struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
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struct crypto_aead *aead;
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struct crypto_blkcipher *null;
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struct crypto_skcipher *null;
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unsigned long align;
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int err = 0;
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@ -1118,7 +1122,7 @@ static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
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if (IS_ERR(aead))
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return PTR_ERR(aead);
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null = crypto_get_default_null_skcipher();
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null = crypto_get_default_null_skcipher2();
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err = PTR_ERR(null);
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if (IS_ERR(null))
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goto err_free_aead;
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@ -1146,7 +1150,7 @@ static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
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struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
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crypto_free_aead(ctx->child);
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crypto_put_default_null_skcipher();
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crypto_put_default_null_skcipher2();
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}
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static void crypto_rfc4543_free(struct aead_instance *inst)
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@ -1221,6 +1225,7 @@ static int crypto_rfc4543_create(struct crypto_template *tmpl,
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inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
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inst->alg.ivsize = 8;
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inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
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inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
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inst->alg.init = crypto_rfc4543_init_tfm;
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