linux-kernel - [PATCH v2 10/18] crypto: rsa: Move struct rsa_mpi

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Date:   Thu,  8 Apr 2021 16:15:08 +0200
From:   Varad Gautam <varad.gautam@...e.com>
To:     linux-crypto@...r.kernel.org
CC:     varad.gautam@...e.com, dhowells@...hat.com,
        herbert@...dor.apana.org.au, davem@...emloft.net, vt@...linux.org,
        tianjia.zhang@...ux.alibaba.com, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org, jarkko@...nel.org
Subject: [PATCH v2 10/18] crypto: rsa: Move struct rsa_mpi_key definition to rsa.h

The RSASSA-PSS signature scheme requires knowing the RSA modulus size
in bits. The rsa akcipher_alg max_size call is insufficient for this,
as the returned keysize is rounded up to the next byte.

Since the RSA modulus is stored as an MPI accessible via
struct rsa_mpi_key, move the struct definition to rsa.h to help RSA
sub-implementations query the MPI values.

Signed-off-by: Varad Gautam <varad.gautam@...e.com>
---
 crypto/rsa.c                  | 6 ------
 include/crypto/internal/rsa.h | 7 +++++++
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/crypto/rsa.c b/crypto/rsa.c
index 4cdbec95d0779..5c4eece5b8028 100644
--- a/crypto/rsa.c
+++ b/crypto/rsa.c
@@ -12,12 +12,6 @@
 #include <crypto/akcipher.h>
 #include <crypto/algapi.h>
 
-struct rsa_mpi_key {
-	MPI n;
-	MPI e;
-	MPI d;
-};
-
 /*
  * RSAEP function [RFC3447 sec 5.1.1]
  * c = m^e mod n;
diff --git a/include/crypto/internal/rsa.h b/include/crypto/internal/rsa.h
index e870133f4b775..e73c61f788e68 100644
--- a/include/crypto/internal/rsa.h
+++ b/include/crypto/internal/rsa.h
@@ -7,6 +7,7 @@
  */
 #ifndef _RSA_HELPER_
 #define _RSA_HELPER_
+#include <linux/mpi.h>
 #include <linux/types.h>
 
 /**
@@ -53,5 +54,11 @@ int rsa_parse_pub_key(struct rsa_key *rsa_key, const void *key,
 int rsa_parse_priv_key(struct rsa_key *rsa_key, const void *key,
 		       unsigned int key_len);
 
+struct rsa_mpi_key {
+	MPI n;
+	MPI e;
+	MPI d;
+};
+
 extern struct crypto_template rsa_pkcs1pad_tmpl;
 #endif
-- 
2.30.2