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

Varad Gautam
2021-04-20T11:46:34Z

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@suse.com>
---
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