[PATCH v3 07/18] crypto: rsa: Move more common code to rsa-common

[Varad Gautam]

Move helpers for setting public/private keys, RSA akcipher
instance setup, keysize querying etc. to rsa-common.c.

Signed-off-by: Varad Gautam <varad.gautam@xxxxxxxx>
---
 crypto/rsa-common.c                  | 183 +++++++++++++++++++++++++++
 crypto/rsa-pkcs1pad.c                | 183 ---------------------------
 include/crypto/internal/rsa-common.h |  13 ++
 3 files changed, 196 insertions(+), 183 deletions(-)

diff --git a/crypto/rsa-common.c b/crypto/rsa-common.c
index 60073c56e3748..d70d7d405165f 100644
--- a/crypto/rsa-common.c
+++ b/crypto/rsa-common.c
@@ -74,3 +74,186 @@ const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
 			return p;
 	return NULL;
 }
+
+int rsapad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
+		       unsigned int keylen)
+{
+	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
+	int err;
+
+	ctx->key_size = 0;
+
+	err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);
+	if (err)
+		return err;
+
+	/* Find out new modulus size from rsa implementation */
+	err = crypto_akcipher_maxsize(ctx->child);
+	if (err > PAGE_SIZE)
+		return -EOPNOTSUPP;
+
+	ctx->key_size = err;
+	return 0;
+}
+
+int rsapad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
+			unsigned int keylen)
+{
+	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
+	int err;
+
+	ctx->key_size = 0;
+
+	err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);
+	if (err)
+		return err;
+
+	/* Find out new modulus size from rsa implementation */
+	err = crypto_akcipher_maxsize(ctx->child);
+	if (err > PAGE_SIZE)
+		return -EOPNOTSUPP;
+
+	ctx->key_size = err;
+	return 0;
+}
+
+unsigned int rsapad_get_max_size(struct crypto_akcipher *tfm)
+{
+	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	/*
+	 * The maximum destination buffer size for the encrypt/sign operations
+	 * will be the same as for RSA, even though it's smaller for
+	 * decrypt/verify.
+	 */
+
+	return ctx->key_size;
+}
+
+void rsapad_akcipher_sg_set_buf(struct scatterlist *sg, void *buf,
+				size_t len, struct scatterlist *next)
+{
+	int nsegs = next ? 2 : 1;
+
+	sg_init_table(sg, nsegs);
+	sg_set_buf(sg, buf, len);
+
+	if (next)
+		sg_chain(sg, nsegs, next);
+}
+
+int rsapad_akcipher_init_tfm(struct crypto_akcipher *tfm)
+{
+	struct akcipher_instance *inst = akcipher_alg_instance(tfm);
+	struct rsapad_inst_ctx *ictx = akcipher_instance_ctx(inst);
+	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
+	struct crypto_akcipher *child_tfm;
+
+	child_tfm = crypto_spawn_akcipher(&ictx->spawn);
+	if (IS_ERR(child_tfm))
+		return PTR_ERR(child_tfm);
+
+	ctx->child = child_tfm;
+	return 0;
+}
+
+void rsapad_akcipher_exit_tfm(struct crypto_akcipher *tfm)
+{
+	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	crypto_free_akcipher(ctx->child);
+}
+
+void rsapad_akcipher_free(struct akcipher_instance *inst)
+{
+	struct rsapad_inst_ctx *ctx = akcipher_instance_ctx(inst);
+	struct crypto_akcipher_spawn *spawn = &ctx->spawn;
+
+	crypto_drop_akcipher(spawn);
+	kfree(inst);
+}
+
+int rsapad_akcipher_create(struct crypto_template *tmpl, struct rtattr **tb,
+			   struct akcipher_alg *alg)
+{
+	u32 mask;
+	struct akcipher_instance *inst;
+	struct rsapad_inst_ctx *ctx;
+	struct akcipher_alg *rsa_alg;
+	const char *hash_name;
+	int err;
+
+	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, &mask);
+	if (err)
+		return err;
+
+	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
+	if (!inst)
+		return -ENOMEM;
+
+	ctx = akcipher_instance_ctx(inst);
+
+	err = crypto_grab_akcipher(&ctx->spawn, akcipher_crypto_instance(inst),
+				   crypto_attr_alg_name(tb[1]), 0, mask);
+	if (err)
+		goto err_free_inst;
+
+	rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn);
+
+	err = -ENAMETOOLONG;
+	hash_name = crypto_attr_alg_name(tb[2]);
+	if (IS_ERR(hash_name)) {
+		if (snprintf(inst->alg.base.cra_name,
+			     CRYPTO_MAX_ALG_NAME, "%s(%s)", tmpl->name,
+			     rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
+			goto err_free_inst;
+
+		if (snprintf(inst->alg.base.cra_driver_name,
+			     CRYPTO_MAX_ALG_NAME, "%s(%s)", tmpl->name,
+			     rsa_alg->base.cra_driver_name) >=
+			     CRYPTO_MAX_ALG_NAME)
+			goto err_free_inst;
+	} else {
+		ctx->digest_info = rsa_lookup_asn1(hash_name);
+		if (!ctx->digest_info) {
+			err = -EINVAL;
+			goto err_free_inst;
+		}
+
+		if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
+			     "%s(%s,%s)", tmpl->name, rsa_alg->base.cra_name,
+			     hash_name) >= CRYPTO_MAX_ALG_NAME)
+			goto err_free_inst;
+
+		if (snprintf(inst->alg.base.cra_driver_name,
+			     CRYPTO_MAX_ALG_NAME, "%s(%s,%s)",
+			     tmpl->name,
+			     rsa_alg->base.cra_driver_name,
+			     hash_name) >= CRYPTO_MAX_ALG_NAME)
+			goto err_free_inst;
+	}
+
+	inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
+	inst->alg.base.cra_ctxsize = sizeof(struct rsapad_tfm_ctx);
+
+	inst->alg.init = alg->init;
+	inst->alg.exit = alg->exit;
+
+	inst->alg.encrypt = alg->encrypt;
+	inst->alg.decrypt = alg->decrypt;
+	inst->alg.sign = alg->sign;
+	inst->alg.verify = alg->verify;
+	inst->alg.set_pub_key = alg->set_pub_key;
+	inst->alg.set_priv_key = alg->set_priv_key;
+	inst->alg.max_size = alg->max_size;
+	inst->alg.reqsize = sizeof(struct rsapad_akciper_req_ctx) + rsa_alg->reqsize;
+
+	inst->free = rsapad_akcipher_free;
+
+	err = akcipher_register_instance(tmpl, inst);
+	if (err) {
+err_free_inst:
+		rsapad_akcipher_free(inst);
+	}
+	return err;
+}
diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index ffb7220b3d10a..30b0193b7352a 100644
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -9,73 +9,6 @@
 #include <linux/module.h>
 #include <linux/random.h>
 
-static int rsapad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
-		unsigned int keylen)
-{
-	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
-	int err;
-
-	ctx->key_size = 0;
-
-	err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);
-	if (err)
-		return err;
-
-	/* Find out new modulus size from rsa implementation */
-	err = crypto_akcipher_maxsize(ctx->child);
-	if (err > PAGE_SIZE)
-		return -ENOTSUPP;
-
-	ctx->key_size = err;
-	return 0;
-}
-
-static int rsapad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
-		unsigned int keylen)
-{
-	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
-	int err;
-
-	ctx->key_size = 0;
-
-	err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);
-	if (err)
-		return err;
-
-	/* Find out new modulus size from rsa implementation */
-	err = crypto_akcipher_maxsize(ctx->child);
-	if (err > PAGE_SIZE)
-		return -ENOTSUPP;
-
-	ctx->key_size = err;
-	return 0;
-}
-
-static unsigned int rsapad_get_max_size(struct crypto_akcipher *tfm)
-{
-	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
-
-	/*
-	 * The maximum destination buffer size for the encrypt/sign operations
-	 * will be the same as for RSA, even though it's smaller for
-	 * decrypt/verify.
-	 */
-
-	return ctx->key_size;
-}
-
-static void rsapad_akcipher_sg_set_buf(struct scatterlist *sg, void *buf,
-				       size_t len, struct scatterlist *next)
-{
-	int nsegs = next ? 2 : 1;
-
-	sg_init_table(sg, nsegs);
-	sg_set_buf(sg, buf, len);
-
-	if (next)
-		sg_chain(sg, nsegs, next);
-}
-
 typedef int (*rsa_akcipher_complete_cb)(struct akcipher_request *, int);
 static void rsapad_akcipher_req_complete(struct crypto_async_request *child_async_req,
 					 int err, rsa_akcipher_complete_cb cb)
@@ -461,37 +394,6 @@ static int pkcs1pad_verify(struct akcipher_request *req)
 	return err;
 }
 
-static int rsapad_akcipher_init_tfm(struct crypto_akcipher *tfm)
-{
-	struct akcipher_instance *inst = akcipher_alg_instance(tfm);
-	struct rsapad_inst_ctx *ictx = akcipher_instance_ctx(inst);
-	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
-	struct crypto_akcipher *child_tfm;
-
-	child_tfm = crypto_spawn_akcipher(&ictx->spawn);
-	if (IS_ERR(child_tfm))
-		return PTR_ERR(child_tfm);
-
-	ctx->child = child_tfm;
-	return 0;
-}
-
-static void rsapad_akcipher_exit_tfm(struct crypto_akcipher *tfm)
-{
-	struct rsapad_tfm_ctx *ctx = akcipher_tfm_ctx(tfm);
-
-	crypto_free_akcipher(ctx->child);
-}
-
-static void rsapad_akcipher_free(struct akcipher_instance *inst)
-{
-	struct rsapad_inst_ctx *ctx = akcipher_instance_ctx(inst);
-	struct crypto_akcipher_spawn *spawn = &ctx->spawn;
-
-	crypto_drop_akcipher(spawn);
-	kfree(inst);
-}
-
 static struct akcipher_alg pkcs1pad_alg = {
 	.init = rsapad_akcipher_init_tfm,
 	.exit = rsapad_akcipher_exit_tfm,
@@ -505,91 +407,6 @@ static struct akcipher_alg pkcs1pad_alg = {
 	.max_size = rsapad_get_max_size
 };
 
-static int rsapad_akcipher_create(struct crypto_template *tmpl, struct rtattr **tb,
-				  struct akcipher_alg *alg)
-{
-	u32 mask;
-	struct akcipher_instance *inst;
-	struct rsapad_inst_ctx *ctx;
-	struct akcipher_alg *rsa_alg;
-	const char *hash_name;
-	int err;
-
-	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, &mask);
-	if (err)
-		return err;
-
-	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
-	if (!inst)
-		return -ENOMEM;
-
-	ctx = akcipher_instance_ctx(inst);
-
-	err = crypto_grab_akcipher(&ctx->spawn, akcipher_crypto_instance(inst),
-				   crypto_attr_alg_name(tb[1]), 0, mask);
-	if (err)
-		goto err_free_inst;
-
-	rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn);
-
-	err = -ENAMETOOLONG;
-	hash_name = crypto_attr_alg_name(tb[2]);
-	if (IS_ERR(hash_name)) {
-		if (snprintf(inst->alg.base.cra_name,
-			     CRYPTO_MAX_ALG_NAME, "%s(%s)", tmpl->name,
-			     rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
-			goto err_free_inst;
-
-		if (snprintf(inst->alg.base.cra_driver_name,
-			     CRYPTO_MAX_ALG_NAME, "%s(%s)", tmpl->name,
-			     rsa_alg->base.cra_driver_name) >=
-			     CRYPTO_MAX_ALG_NAME)
-			goto err_free_inst;
-	} else {
-		ctx->digest_info = rsa_lookup_asn1(hash_name);
-		if (!ctx->digest_info) {
-			err = -EINVAL;
-			goto err_free_inst;
-		}
-
-		if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
-			     "%s(%s,%s)", tmpl->name, rsa_alg->base.cra_name,
-			     hash_name) >= CRYPTO_MAX_ALG_NAME)
-			goto err_free_inst;
-
-		if (snprintf(inst->alg.base.cra_driver_name,
-			     CRYPTO_MAX_ALG_NAME, "%s(%s,%s)",
-			     tmpl->name,
-			     rsa_alg->base.cra_driver_name,
-			     hash_name) >= CRYPTO_MAX_ALG_NAME)
-			goto err_free_inst;
-	}
-
-	inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
-	inst->alg.base.cra_ctxsize = sizeof(struct rsapad_tfm_ctx);
-
-	inst->alg.init = alg->init;
-	inst->alg.exit = alg->exit;
-
-	inst->alg.encrypt = alg->encrypt;
-	inst->alg.decrypt = alg->decrypt;
-	inst->alg.sign = alg->sign;
-	inst->alg.verify = alg->verify;
-	inst->alg.set_pub_key = alg->set_pub_key;
-	inst->alg.set_priv_key = alg->set_priv_key;
-	inst->alg.max_size = alg->max_size;
-	inst->alg.reqsize = sizeof(struct rsapad_akciper_req_ctx) + rsa_alg->reqsize;
-
-	inst->free = rsapad_akcipher_free;
-
-	err = akcipher_register_instance(tmpl, inst);
-	if (err) {
-err_free_inst:
-		rsapad_akcipher_free(inst);
-	}
-	return err;
-}
-
 static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
 {
 	return rsapad_akcipher_create(tmpl, tb, &pkcs1pad_alg);
diff --git a/include/crypto/internal/rsa-common.h b/include/crypto/internal/rsa-common.h
index ecdce0cdafaa3..a6f20cce610ab 100644
--- a/include/crypto/internal/rsa-common.h
+++ b/include/crypto/internal/rsa-common.h
@@ -34,4 +34,17 @@ struct rsapad_akciper_req_ctx {
 	struct akcipher_request child_req;
 };
 
+int rsapad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
+		       unsigned int keylen);
+int rsapad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
+			unsigned int keylen);
+unsigned int rsapad_get_max_size(struct crypto_akcipher *tfm);
+void rsapad_akcipher_sg_set_buf(struct scatterlist *sg, void *buf,
+				size_t len, struct scatterlist *next);
+int rsapad_akcipher_init_tfm(struct crypto_akcipher *tfm);
+void rsapad_akcipher_exit_tfm(struct crypto_akcipher *tfm);
+void rsapad_akcipher_free(struct akcipher_instance *inst);
+int rsapad_akcipher_create(struct crypto_template *tmpl, struct rtattr **tb,
+			   struct akcipher_alg *alg);
+
 #endif
-- 
2.30.2