1 files changed, 356 insertions, 42 deletions

diff --git a/crypto/hmac.c b/crypto/hmac.c
index 7cec25ff9889..148af460ae97 100644
--- a/crypto/hmac.c
+++ b/crypto/hmac.c
@@ -13,13 +13,11 @@
 
 #include <crypto/hmac.h>
 #include <crypto/internal/hash.h>
-#include <crypto/scatterwalk.h>
 #include <linux/err.h>
 #include <linux/fips.h>
-#include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/scatterlist.h>
+#include <linux/slab.h>
 #include <linux/string.h>
 
 struct hmac_ctx {
@@ -28,6 +26,12 @@ struct hmac_ctx {
 	u8 pads[];
 };
 
+struct ahash_hmac_ctx {
+	struct crypto_ahash *hash;
+	/* Contains 'u8 ipad[statesize];', then 'u8 opad[statesize];' */
+	u8 pads[];
+};
+
 static int hmac_setkey(struct crypto_shash *parent,
 		       const u8 *inkey, unsigned int keylen)
 {
@@ -39,7 +43,7 @@ static int hmac_setkey(struct crypto_shash *parent,
 	u8 *ipad = &tctx->pads[0];
 	u8 *opad = &tctx->pads[ss];
 	SHASH_DESC_ON_STACK(shash, hash);
-	unsigned int i;
+	int err, i;
 
 	if (fips_enabled && (keylen < 112 / 8))
 		return -EINVAL;
@@ -65,12 +69,14 @@ static int hmac_setkey(struct crypto_shash *parent,
 		opad[i] ^= HMAC_OPAD_VALUE;
 	}
 
-	return crypto_shash_init(shash) ?:
-	       crypto_shash_update(shash, ipad, bs) ?:
-	       crypto_shash_export(shash, ipad) ?:
-	       crypto_shash_init(shash) ?:
-	       crypto_shash_update(shash, opad, bs) ?:
-	       crypto_shash_export(shash, opad);
+	err = crypto_shash_init(shash) ?:
+	      crypto_shash_update(shash, ipad, bs) ?:
+	      crypto_shash_export(shash, ipad) ?:
+	      crypto_shash_init(shash) ?:
+	      crypto_shash_update(shash, opad, bs) ?:
+	      crypto_shash_export(shash, opad);
+	shash_desc_zero(shash);
+	return err;
 }
 
 static int hmac_export(struct shash_desc *pdesc, void *out)
@@ -90,6 +96,22 @@ static int hmac_import(struct shash_desc *pdesc, const void *in)
 	return crypto_shash_import(desc, in);
 }
 
+static int hmac_export_core(struct shash_desc *pdesc, void *out)
+{
+	struct shash_desc *desc = shash_desc_ctx(pdesc);
+
+	return crypto_shash_export_core(desc, out);
+}
+
+static int hmac_import_core(struct shash_desc *pdesc, const void *in)
+{
+	const struct hmac_ctx *tctx = crypto_shash_ctx(pdesc->tfm);
+	struct shash_desc *desc = shash_desc_ctx(pdesc);
+
+	desc->tfm = tctx->hash;
+	return crypto_shash_import_core(desc, in);
+}
+
 static int hmac_init(struct shash_desc *pdesc)
 {
 	const struct hmac_ctx *tctx = crypto_shash_ctx(pdesc->tfm);
@@ -105,20 +127,6 @@ static int hmac_update(struct shash_desc *pdesc,
 	return crypto_shash_update(desc, data, nbytes);
 }
 
-static int hmac_final(struct shash_desc *pdesc, u8 *out)
-{
-	struct crypto_shash *parent = pdesc->tfm;
-	int ds = crypto_shash_digestsize(parent);
-	int ss = crypto_shash_statesize(parent);
-	const struct hmac_ctx *tctx = crypto_shash_ctx(parent);
-	const u8 *opad = &tctx->pads[ss];
-	struct shash_desc *desc = shash_desc_ctx(pdesc);
-
-	return crypto_shash_final(desc, out) ?:
-	       crypto_shash_import(desc, opad) ?:
-	       crypto_shash_finup(desc, out, ds, out);
-}
-
 static int hmac_finup(struct shash_desc *pdesc, const u8 *data,
 		      unsigned int nbytes, u8 *out)
 {
@@ -146,9 +154,6 @@ static int hmac_init_tfm(struct crypto_shash *parent)
 	if (IS_ERR(hash))
 		return PTR_ERR(hash);
 
-	parent->descsize = sizeof(struct shash_desc) +
-			   crypto_shash_descsize(hash);
-
 	tctx->hash = hash;
 	return 0;
 }
@@ -174,26 +179,23 @@ static void hmac_exit_tfm(struct crypto_shash *parent)
 	crypto_free_shash(tctx->hash);
 }
 
-static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
+static int __hmac_create_shash(struct crypto_template *tmpl,
+			       struct rtattr **tb, u32 mask)
 {
 	struct shash_instance *inst;
 	struct crypto_shash_spawn *spawn;
 	struct crypto_alg *alg;
 	struct shash_alg *salg;
-	u32 mask;
 	int err;
 	int ds;
 	int ss;
 
-	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
-	if (err)
-		return err;
-
 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 	if (!inst)
 		return -ENOMEM;
 	spawn = shash_instance_ctx(inst);
 
+	mask |= CRYPTO_AHASH_ALG_NO_EXPORT_CORE;
 	err = crypto_grab_shash(spawn, shash_crypto_instance(inst),
 				crypto_attr_alg_name(tb[1]), 0, mask);
 	if (err)
@@ -212,7 +214,8 @@ static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
 	    ss < alg->cra_blocksize)
 		goto err_free_inst;
 
-	err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
+	err = crypto_inst_setname(shash_crypto_instance(inst), "hmac",
+				  "hmac-shash", alg);
 	if (err)
 		goto err_free_inst;
 
@@ -222,12 +225,14 @@ static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
 
 	inst->alg.digestsize = ds;
 	inst->alg.statesize = ss;
+	inst->alg.descsize = sizeof(struct shash_desc) + salg->descsize;
 	inst->alg.init = hmac_init;
 	inst->alg.update = hmac_update;
-	inst->alg.final = hmac_final;
 	inst->alg.finup = hmac_finup;
 	inst->alg.export = hmac_export;
 	inst->alg.import = hmac_import;
+	inst->alg.export_core = hmac_export_core;
+	inst->alg.import_core = hmac_import_core;
 	inst->alg.setkey = hmac_setkey;
 	inst->alg.init_tfm = hmac_init_tfm;
 	inst->alg.clone_tfm = hmac_clone_tfm;
@@ -243,23 +248,332 @@ err_free_inst:
 	return err;
 }
 
-static struct crypto_template hmac_tmpl = {
-	.name = "hmac",
-	.create = hmac_create,
-	.module = THIS_MODULE,
+static int hmac_setkey_ahash(struct crypto_ahash *parent,
+			     const u8 *inkey, unsigned int keylen)
+{
+	struct ahash_hmac_ctx *tctx = crypto_ahash_ctx(parent);
+	struct crypto_ahash *fb = crypto_ahash_fb(tctx->hash);
+	int ds = crypto_ahash_digestsize(parent);
+	int bs = crypto_ahash_blocksize(parent);
+	int ss = crypto_ahash_statesize(parent);
+	HASH_REQUEST_ON_STACK(req, fb);
+	u8 *opad = &tctx->pads[ss];
+	u8 *ipad = &tctx->pads[0];
+	int err, i;
+
+	if (fips_enabled && (keylen < 112 / 8))
+		return -EINVAL;
+
+	ahash_request_set_callback(req, 0, NULL, NULL);
+
+	if (keylen > bs) {
+		ahash_request_set_virt(req, inkey, ipad, keylen);
+		err = crypto_ahash_digest(req);
+		if (err)
+			goto out_zero_req;
+
+		keylen = ds;
+	} else
+		memcpy(ipad, inkey, keylen);
+
+	memset(ipad + keylen, 0, bs - keylen);
+	memcpy(opad, ipad, bs);
+
+	for (i = 0; i < bs; i++) {
+		ipad[i] ^= HMAC_IPAD_VALUE;
+		opad[i] ^= HMAC_OPAD_VALUE;
+	}
+
+	ahash_request_set_virt(req, ipad, NULL, bs);
+	err = crypto_ahash_init(req) ?:
+	      crypto_ahash_update(req) ?:
+	      crypto_ahash_export(req, ipad);
+
+	ahash_request_set_virt(req, opad, NULL, bs);
+	err = err ?:
+	      crypto_ahash_init(req) ?:
+	      crypto_ahash_update(req) ?:
+	      crypto_ahash_export(req, opad);
+
+out_zero_req:
+	HASH_REQUEST_ZERO(req);
+	return err;
+}
+
+static int hmac_export_ahash(struct ahash_request *preq, void *out)
+{
+	return crypto_ahash_export(ahash_request_ctx(preq), out);
+}
+
+static int hmac_import_ahash(struct ahash_request *preq, const void *in)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(preq);
+	struct ahash_hmac_ctx *tctx = crypto_ahash_ctx(tfm);
+	struct ahash_request *req = ahash_request_ctx(preq);
+
+	ahash_request_set_tfm(req, tctx->hash);
+	return crypto_ahash_import(req, in);
+}
+
+static int hmac_export_core_ahash(struct ahash_request *preq, void *out)
+{
+	return crypto_ahash_export_core(ahash_request_ctx(preq), out);
+}
+
+static int hmac_import_core_ahash(struct ahash_request *preq, const void *in)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(preq);
+	struct ahash_hmac_ctx *tctx = crypto_ahash_ctx(tfm);
+	struct ahash_request *req = ahash_request_ctx(preq);
+
+	ahash_request_set_tfm(req, tctx->hash);
+	return crypto_ahash_import_core(req, in);
+}
+
+static int hmac_init_ahash(struct ahash_request *preq)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(preq);
+	struct ahash_hmac_ctx *tctx = crypto_ahash_ctx(tfm);
+
+	return hmac_import_ahash(preq, &tctx->pads[0]);
+}
+
+static int hmac_update_ahash(struct ahash_request *preq)
+{
+	struct ahash_request *req = ahash_request_ctx(preq);
+
+	ahash_request_set_callback(req, ahash_request_flags(preq),
+				   preq->base.complete, preq->base.data);
+	if (ahash_request_isvirt(preq))
+		ahash_request_set_virt(req, preq->svirt, NULL, preq->nbytes);
+	else
+		ahash_request_set_crypt(req, preq->src, NULL, preq->nbytes);
+	return crypto_ahash_update(req);
+}
+
+static int hmac_finup_finish(struct ahash_request *preq, unsigned int mask)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(preq);
+	struct ahash_request *req = ahash_request_ctx(preq);
+	struct ahash_hmac_ctx *tctx = crypto_ahash_ctx(tfm);
+	int ds = crypto_ahash_digestsize(tfm);
+	int ss = crypto_ahash_statesize(tfm);
+	const u8 *opad = &tctx->pads[ss];
+
+	ahash_request_set_callback(req, ahash_request_flags(preq) & ~mask,
+				   preq->base.complete, preq->base.data);
+	ahash_request_set_virt(req, preq->result, preq->result, ds);
+	return crypto_ahash_import(req, opad) ?:
+	       crypto_ahash_finup(req);
+
+}
+
+static void hmac_finup_done(void *data, int err)
+{
+	struct ahash_request *preq = data;
+
+	if (err)
+		goto out;
+
+	err = hmac_finup_finish(preq, CRYPTO_TFM_REQ_MAY_SLEEP);
+	if (err == -EINPROGRESS || err == -EBUSY)
+		return;
+
+out:
+	ahash_request_complete(preq, err);
+}
+
+static int hmac_finup_ahash(struct ahash_request *preq)
+{
+	struct ahash_request *req = ahash_request_ctx(preq);
+
+	ahash_request_set_callback(req, ahash_request_flags(preq),
+				   hmac_finup_done, preq);
+	if (ahash_request_isvirt(preq))
+		ahash_request_set_virt(req, preq->svirt, preq->result,
+				       preq->nbytes);
+	else
+		ahash_request_set_crypt(req, preq->src, preq->result,
+					preq->nbytes);
+	return crypto_ahash_finup(req) ?:
+	       hmac_finup_finish(preq, 0);
+}
+
+static int hmac_digest_ahash(struct ahash_request *preq)
+{
+	return hmac_init_ahash(preq) ?:
+	       hmac_finup_ahash(preq);
+}
+
+static int hmac_init_ahash_tfm(struct crypto_ahash *parent)
+{
+	struct ahash_instance *inst = ahash_alg_instance(parent);
+	struct ahash_hmac_ctx *tctx = crypto_ahash_ctx(parent);
+	struct crypto_ahash *hash;
+
+	hash = crypto_spawn_ahash(ahash_instance_ctx(inst));
+	if (IS_ERR(hash))
+		return PTR_ERR(hash);
+
+	if (crypto_ahash_reqsize(parent) < sizeof(struct ahash_request) +
+					   crypto_ahash_reqsize(hash))
+		return -EINVAL;
+
+	tctx->hash = hash;
+	return 0;
+}
+
+static int hmac_clone_ahash_tfm(struct crypto_ahash *dst,
+				struct crypto_ahash *src)
+{
+	struct ahash_hmac_ctx *sctx = crypto_ahash_ctx(src);
+	struct ahash_hmac_ctx *dctx = crypto_ahash_ctx(dst);
+	struct crypto_ahash *hash;
+
+	hash = crypto_clone_ahash(sctx->hash);
+	if (IS_ERR(hash))
+		return PTR_ERR(hash);
+
+	dctx->hash = hash;
+	return 0;
+}
+
+static void hmac_exit_ahash_tfm(struct crypto_ahash *parent)
+{
+	struct ahash_hmac_ctx *tctx = crypto_ahash_ctx(parent);
+
+	crypto_free_ahash(tctx->hash);
+}
+
+static int hmac_create_ahash(struct crypto_template *tmpl, struct rtattr **tb,
+			     u32 mask)
+{
+	struct crypto_ahash_spawn *spawn;
+	struct ahash_instance *inst;
+	struct crypto_alg *alg;
+	struct hash_alg_common *halg;
+	int ds, ss, err;
+
+	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+	if (!inst)
+		return -ENOMEM;
+	spawn = ahash_instance_ctx(inst);
+
+	mask |= CRYPTO_AHASH_ALG_NO_EXPORT_CORE;
+	err = crypto_grab_ahash(spawn, ahash_crypto_instance(inst),
+				crypto_attr_alg_name(tb[1]), 0, mask);
+	if (err)
+		goto err_free_inst;
+	halg = crypto_spawn_ahash_alg(spawn);
+	alg = &halg->base;
+
+	/* The underlying hash algorithm must not require a key */
+	err = -EINVAL;
+	if (crypto_hash_alg_needs_key(halg))
+		goto err_free_inst;
+
+	ds = halg->digestsize;
+	ss = halg->statesize;
+	if (ds > alg->cra_blocksize || ss < alg->cra_blocksize)
+		goto err_free_inst;
+
+	err = crypto_inst_setname(ahash_crypto_instance(inst), tmpl->name, alg);
+	if (err)
+		goto err_free_inst;
+
+	inst->alg.halg.base.cra_flags = alg->cra_flags &
+					CRYPTO_ALG_INHERITED_FLAGS;
+	inst->alg.halg.base.cra_flags |= CRYPTO_ALG_REQ_VIRT;
+	inst->alg.halg.base.cra_priority = alg->cra_priority + 100;
+	inst->alg.halg.base.cra_blocksize = alg->cra_blocksize;
+	inst->alg.halg.base.cra_ctxsize = sizeof(struct ahash_hmac_ctx) +
+					  (ss * 2);
+	inst->alg.halg.base.cra_reqsize = sizeof(struct ahash_request) +
+					  alg->cra_reqsize;
+
+	inst->alg.halg.digestsize = ds;
+	inst->alg.halg.statesize = ss;
+	inst->alg.init = hmac_init_ahash;
+	inst->alg.update = hmac_update_ahash;
+	inst->alg.finup = hmac_finup_ahash;
+	inst->alg.digest = hmac_digest_ahash;
+	inst->alg.export = hmac_export_ahash;
+	inst->alg.import = hmac_import_ahash;
+	inst->alg.export_core = hmac_export_core_ahash;
+	inst->alg.import_core = hmac_import_core_ahash;
+	inst->alg.setkey = hmac_setkey_ahash;
+	inst->alg.init_tfm = hmac_init_ahash_tfm;
+	inst->alg.clone_tfm = hmac_clone_ahash_tfm;
+	inst->alg.exit_tfm = hmac_exit_ahash_tfm;
+
+	inst->free = ahash_free_singlespawn_instance;
+
+	err = ahash_register_instance(tmpl, inst);
+	if (err) {
+err_free_inst:
+		ahash_free_singlespawn_instance(inst);
+	}
+	return err;
+}
+
+static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
+{
+	struct crypto_attr_type *algt;
+	u32 mask;
+
+	algt = crypto_get_attr_type(tb);
+	if (IS_ERR(algt))
+		return PTR_ERR(algt);
+
+	mask = crypto_algt_inherited_mask(algt);
+
+	if (!((algt->type ^ CRYPTO_ALG_TYPE_AHASH) &
+	      algt->mask & CRYPTO_ALG_TYPE_MASK))
+		return hmac_create_ahash(tmpl, tb, mask);
+
+	if ((algt->type ^ CRYPTO_ALG_TYPE_SHASH) &
+	    algt->mask & CRYPTO_ALG_TYPE_MASK)
+		return -EINVAL;
+
+	return __hmac_create_shash(tmpl, tb, mask);
+}
+
+static int hmac_create_shash(struct crypto_template *tmpl, struct rtattr **tb)
+{
+	u32 mask;
+	int err;
+
+	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
+	if (err)
+		return err == -EINVAL ? -ENOENT : err;
+
+	return __hmac_create_shash(tmpl, tb, mask);
+}
+
+static struct crypto_template hmac_tmpls[] = {
+	{
+		.name = "hmac",
+		.create = hmac_create,
+		.module = THIS_MODULE,
+	},
+	{
+		.name = "hmac-shash",
+		.create = hmac_create_shash,
+		.module = THIS_MODULE,
+	},
 };
 
 static int __init hmac_module_init(void)
 {
-	return crypto_register_template(&hmac_tmpl);
+	return crypto_register_templates(hmac_tmpls, ARRAY_SIZE(hmac_tmpls));
 }
 
 static void __exit hmac_module_exit(void)
 {
-	crypto_unregister_template(&hmac_tmpl);
+	crypto_unregister_templates(hmac_tmpls, ARRAY_SIZE(hmac_tmpls));
 }
 
-subsys_initcall(hmac_module_init);
+module_init(hmac_module_init);
 module_exit(hmac_module_exit);
 
 MODULE_LICENSE("GPL");