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crypto: rsa-pkcs1pad - Deduplicate set_{pub,priv}_key callbacks

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pkcs1pad_set_pub_key() and pkcs1pad_set_priv_key() are almost identical.

The upcoming migration of sign/verify operations from rsa-pkcs1pad.c
into a separate crypto_template will require another copy of the exact
same functions.  When RSASSA-PSS and RSAES-OAEP are introduced, each
will need yet another copy.

Deduplicate the functions into a single one which lives in a common
header file for reuse by RSASSA-PKCS1-v1_5, RSASSA-PSS and RSAES-OAEP.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Lukas Wunner 2024-09-10 16:30:15 +02:00 committed by Herbert Xu
parent ae117924b2
commit 7964b0d4bd
2 changed files with 30 additions and 28 deletions
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30
crypto/rsa-pkcs1pad.c
View File

@ -131,42 +131,16 @@ static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
unsigned int keylen)
{
struct pkcs1pad_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;
return rsa_set_key(ctx->child, &ctx->key_size, RSA_PUB, key, keylen);
}
static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
unsigned int keylen)
{
struct pkcs1pad_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;
return rsa_set_key(ctx->child, &ctx->key_size, RSA_PRIV, key, keylen);
}
static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)

28
include/crypto/internal/rsa.h
View File

@ -8,6 +8,7 @@
#ifndef _RSA_HELPER_
#define _RSA_HELPER_
#include <linux/types.h>
#include <crypto/akcipher.h>
/**
* rsa_key - RSA key structure
@ -53,5 +54,32 @@ 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);
#define RSA_PUB (true)
#define RSA_PRIV (false)
static inline int rsa_set_key(struct crypto_akcipher *child,
unsigned int *key_size, bool is_pubkey,
const void *key, unsigned int keylen)
{
int err;
*key_size = 0;
if (is_pubkey)
err = crypto_akcipher_set_pub_key(child, key, keylen);
else
err = crypto_akcipher_set_priv_key(child, key, keylen);
if (err)
return err;
/* Find out new modulus size from rsa implementation */
err = crypto_akcipher_maxsize(child);
if (err > PAGE_SIZE)
return -ENOTSUPP;
*key_size = err;
return 0;
}
extern struct crypto_template rsa_pkcs1pad_tmpl;
#endif