mirror of
https://xff.cz/git/u-boot/
synced 2025-09-03 09:42:22 +02:00
lib: crypto: add public key utility
Imported from linux kernel v5.3: asymmetric-type.h with changes marked as __UBOOT__ asymmetric_type.c with changes marked as __UBOOT__ public_key.h with changes marked as __UBOOT__ public_key.c with changes marked as __UBOOT__ Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
This commit is contained in:
AKASHI Takahiro
committed by
Tom Rini
Tom Rini
parent
a9b45e6e83
commit
c4e961ecec
376
lib/crypto/public_key.c
Normal file
376
lib/crypto/public_key.c
Normal file
@@ -0,0 +1,376 @@
|
||||
// SPDX-License-Identifier: GPL-2.0-or-later
|
||||
/* In-software asymmetric public-key crypto subtype
|
||||
*
|
||||
* See Documentation/crypto/asymmetric-keys.txt
|
||||
*
|
||||
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
||||
* Written by David Howells (dhowells@redhat.com)
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) "PKEY: "fmt
|
||||
#ifdef __UBOOT__
|
||||
#include <linux/compat.h>
|
||||
#else
|
||||
#include <linux/module.h>
|
||||
#include <linux/export.h>
|
||||
#endif
|
||||
#include <linux/kernel.h>
|
||||
#ifndef __UBOOT__
|
||||
#include <linux/slab.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <keys/asymmetric-subtype.h>
|
||||
#endif
|
||||
#include <crypto/public_key.h>
|
||||
#ifndef __UBOOT__
|
||||
#include <crypto/akcipher.h>
|
||||
#endif
|
||||
|
||||
MODULE_DESCRIPTION("In-software asymmetric public-key subtype");
|
||||
MODULE_AUTHOR("Red Hat, Inc.");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
#ifndef __UBOOT__
|
||||
/*
|
||||
* Provide a part of a description of the key for /proc/keys.
|
||||
*/
|
||||
static void public_key_describe(const struct key *asymmetric_key,
|
||||
struct seq_file *m)
|
||||
{
|
||||
struct public_key *key = asymmetric_key->payload.data[asym_crypto];
|
||||
|
||||
if (key)
|
||||
seq_printf(m, "%s.%s", key->id_type, key->pkey_algo);
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Destroy a public key algorithm key.
|
||||
*/
|
||||
void public_key_free(struct public_key *key)
|
||||
{
|
||||
if (key) {
|
||||
kfree(key->key);
|
||||
kfree(key->params);
|
||||
kfree(key);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(public_key_free);
|
||||
|
||||
#ifdef __UBOOT__
|
||||
/*
|
||||
* from <linux>/crypto/asymmetric_keys/signature.c
|
||||
*
|
||||
* Destroy a public key signature.
|
||||
*/
|
||||
void public_key_signature_free(struct public_key_signature *sig)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (sig) {
|
||||
for (i = 0; i < ARRAY_SIZE(sig->auth_ids); i++)
|
||||
free(sig->auth_ids[i]);
|
||||
free(sig->s);
|
||||
free(sig->digest);
|
||||
free(sig);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(public_key_signature_free);
|
||||
|
||||
#else
|
||||
/*
|
||||
* Destroy a public key algorithm key.
|
||||
*/
|
||||
static void public_key_destroy(void *payload0, void *payload3)
|
||||
{
|
||||
public_key_free(payload0);
|
||||
public_key_signature_free(payload3);
|
||||
}
|
||||
|
||||
/*
|
||||
* Determine the crypto algorithm name.
|
||||
*/
|
||||
static
|
||||
int software_key_determine_akcipher(const char *encoding,
|
||||
const char *hash_algo,
|
||||
const struct public_key *pkey,
|
||||
char alg_name[CRYPTO_MAX_ALG_NAME])
|
||||
{
|
||||
int n;
|
||||
|
||||
if (strcmp(encoding, "pkcs1") == 0) {
|
||||
/* The data wangled by the RSA algorithm is typically padded
|
||||
* and encoded in some manner, such as EMSA-PKCS1-1_5 [RFC3447
|
||||
* sec 8.2].
|
||||
*/
|
||||
if (!hash_algo)
|
||||
n = snprintf(alg_name, CRYPTO_MAX_ALG_NAME,
|
||||
"pkcs1pad(%s)",
|
||||
pkey->pkey_algo);
|
||||
else
|
||||
n = snprintf(alg_name, CRYPTO_MAX_ALG_NAME,
|
||||
"pkcs1pad(%s,%s)",
|
||||
pkey->pkey_algo, hash_algo);
|
||||
return n >= CRYPTO_MAX_ALG_NAME ? -EINVAL : 0;
|
||||
}
|
||||
|
||||
if (strcmp(encoding, "raw") == 0) {
|
||||
strcpy(alg_name, pkey->pkey_algo);
|
||||
return 0;
|
||||
}
|
||||
|
||||
return -ENOPKG;
|
||||
}
|
||||
|
||||
static u8 *pkey_pack_u32(u8 *dst, u32 val)
|
||||
{
|
||||
memcpy(dst, &val, sizeof(val));
|
||||
return dst + sizeof(val);
|
||||
}
|
||||
|
||||
/*
|
||||
* Query information about a key.
|
||||
*/
|
||||
static int software_key_query(const struct kernel_pkey_params *params,
|
||||
struct kernel_pkey_query *info)
|
||||
{
|
||||
struct crypto_akcipher *tfm;
|
||||
struct public_key *pkey = params->key->payload.data[asym_crypto];
|
||||
char alg_name[CRYPTO_MAX_ALG_NAME];
|
||||
u8 *key, *ptr;
|
||||
int ret, len;
|
||||
|
||||
ret = software_key_determine_akcipher(params->encoding,
|
||||
params->hash_algo,
|
||||
pkey, alg_name);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
tfm = crypto_alloc_akcipher(alg_name, 0, 0);
|
||||
if (IS_ERR(tfm))
|
||||
return PTR_ERR(tfm);
|
||||
|
||||
key = kmalloc(pkey->keylen + sizeof(u32) * 2 + pkey->paramlen,
|
||||
GFP_KERNEL);
|
||||
if (!key)
|
||||
goto error_free_tfm;
|
||||
memcpy(key, pkey->key, pkey->keylen);
|
||||
ptr = key + pkey->keylen;
|
||||
ptr = pkey_pack_u32(ptr, pkey->algo);
|
||||
ptr = pkey_pack_u32(ptr, pkey->paramlen);
|
||||
memcpy(ptr, pkey->params, pkey->paramlen);
|
||||
|
||||
if (pkey->key_is_private)
|
||||
ret = crypto_akcipher_set_priv_key(tfm, key, pkey->keylen);
|
||||
else
|
||||
ret = crypto_akcipher_set_pub_key(tfm, key, pkey->keylen);
|
||||
if (ret < 0)
|
||||
goto error_free_key;
|
||||
|
||||
len = crypto_akcipher_maxsize(tfm);
|
||||
info->key_size = len * 8;
|
||||
info->max_data_size = len;
|
||||
info->max_sig_size = len;
|
||||
info->max_enc_size = len;
|
||||
info->max_dec_size = len;
|
||||
info->supported_ops = (KEYCTL_SUPPORTS_ENCRYPT |
|
||||
KEYCTL_SUPPORTS_VERIFY);
|
||||
if (pkey->key_is_private)
|
||||
info->supported_ops |= (KEYCTL_SUPPORTS_DECRYPT |
|
||||
KEYCTL_SUPPORTS_SIGN);
|
||||
ret = 0;
|
||||
|
||||
error_free_key:
|
||||
kfree(key);
|
||||
error_free_tfm:
|
||||
crypto_free_akcipher(tfm);
|
||||
pr_devel("<==%s() = %d\n", __func__, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Do encryption, decryption and signing ops.
|
||||
*/
|
||||
static int software_key_eds_op(struct kernel_pkey_params *params,
|
||||
const void *in, void *out)
|
||||
{
|
||||
const struct public_key *pkey = params->key->payload.data[asym_crypto];
|
||||
struct akcipher_request *req;
|
||||
struct crypto_akcipher *tfm;
|
||||
struct crypto_wait cwait;
|
||||
struct scatterlist in_sg, out_sg;
|
||||
char alg_name[CRYPTO_MAX_ALG_NAME];
|
||||
char *key, *ptr;
|
||||
int ret;
|
||||
|
||||
pr_devel("==>%s()\n", __func__);
|
||||
|
||||
ret = software_key_determine_akcipher(params->encoding,
|
||||
params->hash_algo,
|
||||
pkey, alg_name);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
tfm = crypto_alloc_akcipher(alg_name, 0, 0);
|
||||
if (IS_ERR(tfm))
|
||||
return PTR_ERR(tfm);
|
||||
|
||||
req = akcipher_request_alloc(tfm, GFP_KERNEL);
|
||||
if (!req)
|
||||
goto error_free_tfm;
|
||||
|
||||
key = kmalloc(pkey->keylen + sizeof(u32) * 2 + pkey->paramlen,
|
||||
GFP_KERNEL);
|
||||
if (!key)
|
||||
goto error_free_req;
|
||||
|
||||
memcpy(key, pkey->key, pkey->keylen);
|
||||
ptr = key + pkey->keylen;
|
||||
ptr = pkey_pack_u32(ptr, pkey->algo);
|
||||
ptr = pkey_pack_u32(ptr, pkey->paramlen);
|
||||
memcpy(ptr, pkey->params, pkey->paramlen);
|
||||
|
||||
if (pkey->key_is_private)
|
||||
ret = crypto_akcipher_set_priv_key(tfm, key, pkey->keylen);
|
||||
else
|
||||
ret = crypto_akcipher_set_pub_key(tfm, key, pkey->keylen);
|
||||
if (ret)
|
||||
goto error_free_key;
|
||||
|
||||
sg_init_one(&in_sg, in, params->in_len);
|
||||
sg_init_one(&out_sg, out, params->out_len);
|
||||
akcipher_request_set_crypt(req, &in_sg, &out_sg, params->in_len,
|
||||
params->out_len);
|
||||
crypto_init_wait(&cwait);
|
||||
akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
|
||||
CRYPTO_TFM_REQ_MAY_SLEEP,
|
||||
crypto_req_done, &cwait);
|
||||
|
||||
/* Perform the encryption calculation. */
|
||||
switch (params->op) {
|
||||
case kernel_pkey_encrypt:
|
||||
ret = crypto_akcipher_encrypt(req);
|
||||
break;
|
||||
case kernel_pkey_decrypt:
|
||||
ret = crypto_akcipher_decrypt(req);
|
||||
break;
|
||||
case kernel_pkey_sign:
|
||||
ret = crypto_akcipher_sign(req);
|
||||
break;
|
||||
default:
|
||||
BUG();
|
||||
}
|
||||
|
||||
ret = crypto_wait_req(ret, &cwait);
|
||||
if (ret == 0)
|
||||
ret = req->dst_len;
|
||||
|
||||
error_free_key:
|
||||
kfree(key);
|
||||
error_free_req:
|
||||
akcipher_request_free(req);
|
||||
error_free_tfm:
|
||||
crypto_free_akcipher(tfm);
|
||||
pr_devel("<==%s() = %d\n", __func__, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Verify a signature using a public key.
|
||||
*/
|
||||
int public_key_verify_signature(const struct public_key *pkey,
|
||||
const struct public_key_signature *sig)
|
||||
{
|
||||
struct crypto_wait cwait;
|
||||
struct crypto_akcipher *tfm;
|
||||
struct akcipher_request *req;
|
||||
struct scatterlist src_sg[2];
|
||||
char alg_name[CRYPTO_MAX_ALG_NAME];
|
||||
char *key, *ptr;
|
||||
int ret;
|
||||
|
||||
pr_devel("==>%s()\n", __func__);
|
||||
|
||||
BUG_ON(!pkey);
|
||||
BUG_ON(!sig);
|
||||
BUG_ON(!sig->s);
|
||||
|
||||
ret = software_key_determine_akcipher(sig->encoding,
|
||||
sig->hash_algo,
|
||||
pkey, alg_name);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
tfm = crypto_alloc_akcipher(alg_name, 0, 0);
|
||||
if (IS_ERR(tfm))
|
||||
return PTR_ERR(tfm);
|
||||
|
||||
ret = -ENOMEM;
|
||||
req = akcipher_request_alloc(tfm, GFP_KERNEL);
|
||||
if (!req)
|
||||
goto error_free_tfm;
|
||||
|
||||
key = kmalloc(pkey->keylen + sizeof(u32) * 2 + pkey->paramlen,
|
||||
GFP_KERNEL);
|
||||
if (!key)
|
||||
goto error_free_req;
|
||||
|
||||
memcpy(key, pkey->key, pkey->keylen);
|
||||
ptr = key + pkey->keylen;
|
||||
ptr = pkey_pack_u32(ptr, pkey->algo);
|
||||
ptr = pkey_pack_u32(ptr, pkey->paramlen);
|
||||
memcpy(ptr, pkey->params, pkey->paramlen);
|
||||
|
||||
if (pkey->key_is_private)
|
||||
ret = crypto_akcipher_set_priv_key(tfm, key, pkey->keylen);
|
||||
else
|
||||
ret = crypto_akcipher_set_pub_key(tfm, key, pkey->keylen);
|
||||
if (ret)
|
||||
goto error_free_key;
|
||||
|
||||
sg_init_table(src_sg, 2);
|
||||
sg_set_buf(&src_sg[0], sig->s, sig->s_size);
|
||||
sg_set_buf(&src_sg[1], sig->digest, sig->digest_size);
|
||||
akcipher_request_set_crypt(req, src_sg, NULL, sig->s_size,
|
||||
sig->digest_size);
|
||||
crypto_init_wait(&cwait);
|
||||
akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG |
|
||||
CRYPTO_TFM_REQ_MAY_SLEEP,
|
||||
crypto_req_done, &cwait);
|
||||
ret = crypto_wait_req(crypto_akcipher_verify(req), &cwait);
|
||||
|
||||
error_free_key:
|
||||
kfree(key);
|
||||
error_free_req:
|
||||
akcipher_request_free(req);
|
||||
error_free_tfm:
|
||||
crypto_free_akcipher(tfm);
|
||||
pr_devel("<==%s() = %d\n", __func__, ret);
|
||||
if (WARN_ON_ONCE(ret > 0))
|
||||
ret = -EINVAL;
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(public_key_verify_signature);
|
||||
|
||||
static int public_key_verify_signature_2(const struct key *key,
|
||||
const struct public_key_signature *sig)
|
||||
{
|
||||
const struct public_key *pk = key->payload.data[asym_crypto];
|
||||
return public_key_verify_signature(pk, sig);
|
||||
}
|
||||
|
||||
/*
|
||||
* Public key algorithm asymmetric key subtype
|
||||
*/
|
||||
struct asymmetric_key_subtype public_key_subtype = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "public_key",
|
||||
.name_len = sizeof("public_key") - 1,
|
||||
.describe = public_key_describe,
|
||||
.destroy = public_key_destroy,
|
||||
.query = software_key_query,
|
||||
.eds_op = software_key_eds_op,
|
||||
.verify_signature = public_key_verify_signature_2,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(public_key_subtype);
|
||||
#endif /* !__UBOOT__ */
|
||||
Reference in New Issue
Block a user