[J-u-boot.git] / lib / crypto / public_key.c

// 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 ([email protected])
 */

#define pr_fmt(fmt) "PKEY: "fmt
#ifdef __UBOOT__
#include <dm/devres.h>
#include <linux/bug.h>
#include <linux/compat.h>
#include <linux/err.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>
#ifdef __UBOOT__
#include <image.h>
#include <u-boot/rsa.h>
#else
#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);

/**
 * public_key_verify_signature - Verify a signature using a public key.
 *
 * @pkey:	Public key
 * @sig:	Signature
 *
 * Verify a signature, @sig, using a RSA public key, @pkey.
 *
 * Return:	0 - verified, non-zero error code - otherwise
 */
int public_key_verify_signature(const struct public_key *pkey,
				const struct public_key_signature *sig)
{
	struct image_sign_info info;
	int ret;

	pr_devel("==>%s()\n", __func__);

	if (!pkey || !sig)
		return -EINVAL;

	if (pkey->key_is_private)
		return -EINVAL;

	memset(&info, '\0', sizeof(info));
	info.padding = image_get_padding_algo("pkcs-1.5");
	/*
	 * Note: image_get_[checksum|crypto]_algo takes a string
	 * argument like "<checksum>,<crypto>"
	 * TODO: support other hash algorithms
	 */
	if (strcmp(sig->pkey_algo, "rsa") || (sig->s_size * 8) != 2048) {
		pr_warn("Encryption is not RSA2048: %s%d\n",
			sig->pkey_algo, sig->s_size * 8);
		return -ENOPKG;
	}
	if (!strcmp(sig->hash_algo, "sha1")) {
		info.checksum = image_get_checksum_algo("sha1,rsa2048");
		info.name = "sha1,rsa2048";
	} else if (!strcmp(sig->hash_algo, "sha256")) {
		info.checksum = image_get_checksum_algo("sha256,rsa2048");
		info.name = "sha256,rsa2048";
	} else {
		pr_warn("unknown msg digest algo: %s\n", sig->hash_algo);
		return -ENOPKG;
	}
	info.crypto = image_get_crypto_algo(info.name);
	if (IS_ERR(info.checksum) || IS_ERR(info.crypto))
		return -ENOPKG;

	info.key = pkey->key;
	info.keylen = pkey->keylen;

	if (rsa_verify_with_pkey(&info, sig->digest, sig->s, sig->s_size))
		ret = -EKEYREJECTED;
	else
		ret = 0;

	pr_devel("<==%s() = %d\n", __func__, ret);
	return ret;
}
#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__ */
Commit	Line	Data
c4e961ec AT	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/* In-software asymmetric public-key crypto subtype
	3	*
	4	* See Documentation/crypto/asymmetric-keys.txt
	5	*
	6	* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
	7	* Written by David Howells ([email protected])
	8	*/
	9
	10	#define pr_fmt(fmt) "PKEY: "fmt
	11	#ifdef __UBOOT__
61b29b82	12	#include <dm/devres.h>
eb41d8a1	13	#include <linux/bug.h>
c4e961ec	14	#include <linux/compat.h>
61b29b82	15	#include <linux/err.h>
c4e961ec AT	16	#else
	17	#include <linux/module.h>
	18	#include <linux/export.h>
	19	#endif
	20	#include <linux/kernel.h>
	21	#ifndef __UBOOT__
	22	#include <linux/slab.h>
	23	#include <linux/seq_file.h>
	24	#include <linux/scatterlist.h>
	25	#include <keys/asymmetric-subtype.h>
	26	#endif
	27	#include <crypto/public_key.h>
b2a1049b AT	28	#ifdef __UBOOT__
	29	#include <image.h>
	30	#include <u-boot/rsa.h>
	31	#else
c4e961ec AT	32	#include <crypto/akcipher.h>
	33	#endif
	34
	35	MODULE_DESCRIPTION("In-software asymmetric public-key subtype");
	36	MODULE_AUTHOR("Red Hat, Inc.");
	37	MODULE_LICENSE("GPL");
	38
	39	#ifndef __UBOOT__
	40	/*
	41	* Provide a part of a description of the key for /proc/keys.
	42	*/
	43	static void public_key_describe(const struct key *asymmetric_key,
	44	struct seq_file *m)
	45	{
	46	struct public_key *key = asymmetric_key->payload.data[asym_crypto];
	47
	48	if (key)
	49	seq_printf(m, "%s.%s", key->id_type, key->pkey_algo);
	50	}
	51	#endif
	52
	53	/*
	54	* Destroy a public key algorithm key.
	55	*/
	56	void public_key_free(struct public_key *key)
	57	{
	58	if (key) {
	59	kfree(key->key);
	60	kfree(key->params);
	61	kfree(key);
	62	}
	63	}
	64	EXPORT_SYMBOL_GPL(public_key_free);
	65
	66	#ifdef __UBOOT__
	67	/*
	68	* from <linux>/crypto/asymmetric_keys/signature.c
	69	*
	70	* Destroy a public key signature.
	71	*/
	72	void public_key_signature_free(struct public_key_signature *sig)
	73	{
	74	int i;
	75
	76	if (sig) {
	77	for (i = 0; i < ARRAY_SIZE(sig->auth_ids); i++)
	78	free(sig->auth_ids[i]);
	79	free(sig->s);
	80	free(sig->digest);
	81	free(sig);
	82	}
	83	}
	84	EXPORT_SYMBOL_GPL(public_key_signature_free);
	85
b2a1049b AT	86	/**
	87	* public_key_verify_signature - Verify a signature using a public key.
	88	*
	89	* @pkey: Public key
	90	* @sig: Signature
	91	*
	92	* Verify a signature, @sig, using a RSA public key, @pkey.
	93	*
	94	* Return: 0 - verified, non-zero error code - otherwise
	95	*/
	96	int public_key_verify_signature(const struct public_key *pkey,
	97	const struct public_key_signature *sig)
	98	{
	99	struct image_sign_info info;
b2a1049b AT	100	int ret;
	101
	102	pr_devel("==>%s()\n", __func__);
	103
	104	if (!pkey \|\| !sig)
	105	return -EINVAL;
	106
	107	if (pkey->key_is_private)
	108	return -EINVAL;
	109
	110	memset(&info, '\0', sizeof(info));
	111	info.padding = image_get_padding_algo("pkcs-1.5");
	112	/*
	113	* Note: image_get_[checksum\|crypto]_algo takes a string
	114	* argument like "<checksum>,<crypto>"
	115	* TODO: support other hash algorithms
	116	*/
	117	if (strcmp(sig->pkey_algo, "rsa") \|\| (sig->s_size * 8) != 2048) {
	118	pr_warn("Encryption is not RSA2048: %s%d\n",
	119	sig->pkey_algo, sig->s_size * 8);
	120	return -ENOPKG;
	121	}
	122	if (!strcmp(sig->hash_algo, "sha1")) {
	123	info.checksum = image_get_checksum_algo("sha1,rsa2048");
	124	info.name = "sha1,rsa2048";
	125	} else if (!strcmp(sig->hash_algo, "sha256")) {
	126	info.checksum = image_get_checksum_algo("sha256,rsa2048");
	127	info.name = "sha256,rsa2048";
	128	} else {
	129	pr_warn("unknown msg digest algo: %s\n", sig->hash_algo);
	130	return -ENOPKG;
	131	}
	132	info.crypto = image_get_crypto_algo(info.name);
	133	if (IS_ERR(info.checksum) \|\| IS_ERR(info.crypto))
	134	return -ENOPKG;
	135
	136	info.key = pkey->key;
	137	info.keylen = pkey->keylen;
	138
b2a1049b AT	139	if (rsa_verify_with_pkey(&info, sig->digest, sig->s, sig->s_size))
	140	ret = -EKEYREJECTED;
	141	else
	142	ret = 0;
	143
	144	pr_devel("<==%s() = %d\n", __func__, ret);
	145	return ret;
	146	}
c4e961ec AT	147	#else
	148	/*
	149	* Destroy a public key algorithm key.
	150	*/
	151	static void public_key_destroy(void payload0, void payload3)
	152	{
	153	public_key_free(payload0);
	154	public_key_signature_free(payload3);
	155	}
	156
	157	/*
	158	* Determine the crypto algorithm name.
	159	*/
	160	static
	161	int software_key_determine_akcipher(const char *encoding,
	162	const char *hash_algo,
	163	const struct public_key *pkey,
	164	char alg_name[CRYPTO_MAX_ALG_NAME])
	165	{
	166	int n;
	167
	168	if (strcmp(encoding, "pkcs1") == 0) {
	169	/* The data wangled by the RSA algorithm is typically padded
	170	* and encoded in some manner, such as EMSA-PKCS1-1_5 [RFC3447
	171	* sec 8.2].
	172	*/
	173	if (!hash_algo)
	174	n = snprintf(alg_name, CRYPTO_MAX_ALG_NAME,
	175	"pkcs1pad(%s)",
	176	pkey->pkey_algo);
	177	else
	178	n = snprintf(alg_name, CRYPTO_MAX_ALG_NAME,
	179	"pkcs1pad(%s,%s)",
	180	pkey->pkey_algo, hash_algo);
	181	return n >= CRYPTO_MAX_ALG_NAME ? -EINVAL : 0;
	182	}
	183
	184	if (strcmp(encoding, "raw") == 0) {
	185	strcpy(alg_name, pkey->pkey_algo);
	186	return 0;
	187	}
	188
	189	return -ENOPKG;
	190	}
	191
	192	static u8 pkey_pack_u32(u8 dst, u32 val)
	193	{
	194	memcpy(dst, &val, sizeof(val));
	195	return dst + sizeof(val);
	196	}
	197
	198	/*
	199	* Query information about a key.
	200	*/
	201	static int software_key_query(const struct kernel_pkey_params *params,
	202	struct kernel_pkey_query *info)
	203	{
	204	struct crypto_akcipher *tfm;
	205	struct public_key *pkey = params->key->payload.data[asym_crypto];
	206	char alg_name[CRYPTO_MAX_ALG_NAME];
	207	u8 key, ptr;
	208	int ret, len;
	209
	210	ret = software_key_determine_akcipher(params->encoding,
211	params->hash_algo,
212	pkey, alg_name);
213	if (ret < 0)
214	return ret;
215
216	tfm = crypto_alloc_akcipher(alg_name, 0, 0);
217	if (IS_ERR(tfm))
218	return PTR_ERR(tfm);
219
220	key = kmalloc(pkey->keylen + sizeof(u32) * 2 + pkey->paramlen,
221	GFP_KERNEL);
222	if (!key)
223	goto error_free_tfm;
224	memcpy(key, pkey->key, pkey->keylen);
225	ptr = key + pkey->keylen;
226	ptr = pkey_pack_u32(ptr, pkey->algo);
227	ptr = pkey_pack_u32(ptr, pkey->paramlen);
228	memcpy(ptr, pkey->params, pkey->paramlen);
229
230	if (pkey->key_is_private)
231	ret = crypto_akcipher_set_priv_key(tfm, key, pkey->keylen);
232	else
233	ret = crypto_akcipher_set_pub_key(tfm, key, pkey->keylen);
234	if (ret < 0)
235	goto error_free_key;
236
237	len = crypto_akcipher_maxsize(tfm);
238	info->key_size = len * 8;
239	info->max_data_size = len;
240	info->max_sig_size = len;
241	info->max_enc_size = len;
242	info->max_dec_size = len;
243	info->supported_ops = (KEYCTL_SUPPORTS_ENCRYPT \|
244	KEYCTL_SUPPORTS_VERIFY);
245	if (pkey->key_is_private)
246	info->supported_ops \|= (KEYCTL_SUPPORTS_DECRYPT \|
247	KEYCTL_SUPPORTS_SIGN);
248	ret = 0;
249
250	error_free_key:
251	kfree(key);
252	error_free_tfm:
253	crypto_free_akcipher(tfm);
254	pr_devel("<==%s() = %d\n", __func__, ret);
255	return ret;
256	}
257
258	/*
259	* Do encryption, decryption and signing ops.
260	*/
261	static int software_key_eds_op(struct kernel_pkey_params *params,
262	const void in, void out)
263	{
264	const struct public_key *pkey = params->key->payload.data[asym_crypto];
265	struct akcipher_request *req;
266	struct crypto_akcipher *tfm;
267	struct crypto_wait cwait;
268	struct scatterlist in_sg, out_sg;
269	char alg_name[CRYPTO_MAX_ALG_NAME];
270	char key, ptr;
271	int ret;
272
273	pr_devel("==>%s()\n", __func__);
274
275	ret = software_key_determine_akcipher(params->encoding,
276	params->hash_algo,
277	pkey, alg_name);
278	if (ret < 0)
279	return ret;
280
281	tfm = crypto_alloc_akcipher(alg_name, 0, 0);
282	if (IS_ERR(tfm))
283	return PTR_ERR(tfm);
284
285	req = akcipher_request_alloc(tfm, GFP_KERNEL);
286	if (!req)
287	goto error_free_tfm;
288
289	key = kmalloc(pkey->keylen + sizeof(u32) * 2 + pkey->paramlen,
290	GFP_KERNEL);
291	if (!key)
292	goto error_free_req;
293
294	memcpy(key, pkey->key, pkey->keylen);
295	ptr = key + pkey->keylen;
296	ptr = pkey_pack_u32(ptr, pkey->algo);
297	ptr = pkey_pack_u32(ptr, pkey->paramlen);
298	memcpy(ptr, pkey->params, pkey->paramlen);
299
300	if (pkey->key_is_private)
301	ret = crypto_akcipher_set_priv_key(tfm, key, pkey->keylen);
302	else
303	ret = crypto_akcipher_set_pub_key(tfm, key, pkey->keylen);
304	if (ret)
305	goto error_free_key;
306
307	sg_init_one(&in_sg, in, params->in_len);
308	sg_init_one(&out_sg, out, params->out_len);
309	akcipher_request_set_crypt(req, &in_sg, &out_sg, params->in_len,
310	params->out_len);
311	crypto_init_wait(&cwait);
312	akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG \|
313	CRYPTO_TFM_REQ_MAY_SLEEP,
314	crypto_req_done, &cwait);
315
316	/* Perform the encryption calculation. */
317	switch (params->op) {
318	case kernel_pkey_encrypt:
319	ret = crypto_akcipher_encrypt(req);
320	break;
321	case kernel_pkey_decrypt:
322	ret = crypto_akcipher_decrypt(req);
323	break;
324	case kernel_pkey_sign:
325	ret = crypto_akcipher_sign(req);
326	break;
327	default:
328	BUG();
329	}
330
331	ret = crypto_wait_req(ret, &cwait);
332	if (ret == 0)
333	ret = req->dst_len;
334
335	error_free_key:
336	kfree(key);
337	error_free_req:
338	akcipher_request_free(req);
339	error_free_tfm:
340	crypto_free_akcipher(tfm);
341	pr_devel("<==%s() = %d\n", __func__, ret);
342	return ret;
343	}
344
345	/*
346	* Verify a signature using a public key.
347	*/
348	int public_key_verify_signature(const struct public_key *pkey,
349	const struct public_key_signature *sig)
350	{
351	struct crypto_wait cwait;
352	struct crypto_akcipher *tfm;
353	struct akcipher_request *req;
354	struct scatterlist src_sg[2];
355	char alg_name[CRYPTO_MAX_ALG_NAME];
356	char key, ptr;
357	int ret;
358
359	pr_devel("==>%s()\n", __func__);
360
361	BUG_ON(!pkey);
362	BUG_ON(!sig);
363	BUG_ON(!sig->s);
364
365	ret = software_key_determine_akcipher(sig->encoding,
366	sig->hash_algo,
367	pkey, alg_name);
368	if (ret < 0)
369	return ret;
370
371	tfm = crypto_alloc_akcipher(alg_name, 0, 0);
372	if (IS_ERR(tfm))
373	return PTR_ERR(tfm);
374
375	ret = -ENOMEM;
376	req = akcipher_request_alloc(tfm, GFP_KERNEL);
377	if (!req)
378	goto error_free_tfm;
379
380	key = kmalloc(pkey->keylen + sizeof(u32) * 2 + pkey->paramlen,
381	GFP_KERNEL);
382	if (!key)
383	goto error_free_req;
384
385	memcpy(key, pkey->key, pkey->keylen);
386	ptr = key + pkey->keylen;
387	ptr = pkey_pack_u32(ptr, pkey->algo);
388	ptr = pkey_pack_u32(ptr, pkey->paramlen);
389	memcpy(ptr, pkey->params, pkey->paramlen);
390
391	if (pkey->key_is_private)
392	ret = crypto_akcipher_set_priv_key(tfm, key, pkey->keylen);
393	else
394	ret = crypto_akcipher_set_pub_key(tfm, key, pkey->keylen);
395	if (ret)
396	goto error_free_key;
397
398	sg_init_table(src_sg, 2);
399	sg_set_buf(&src_sg[0], sig->s, sig->s_size);
400	sg_set_buf(&src_sg[1], sig->digest, sig->digest_size);
401	akcipher_request_set_crypt(req, src_sg, NULL, sig->s_size,
402	sig->digest_size);
403	crypto_init_wait(&cwait);
404	akcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG \|
405	CRYPTO_TFM_REQ_MAY_SLEEP,
406	crypto_req_done, &cwait);
407	ret = crypto_wait_req(crypto_akcipher_verify(req), &cwait);
408
409	error_free_key:
410	kfree(key);
411	error_free_req:
412	akcipher_request_free(req);
413	error_free_tfm:
414	crypto_free_akcipher(tfm);
415	pr_devel("<==%s() = %d\n", __func__, ret);
416	if (WARN_ON_ONCE(ret > 0))
417	ret = -EINVAL;
418	return ret;
419	}
420	EXPORT_SYMBOL_GPL(public_key_verify_signature);
421
422	static int public_key_verify_signature_2(const struct key *key,
423	const struct public_key_signature *sig)
424	{
425	const struct public_key *pk = key->payload.data[asym_crypto];
426	return public_key_verify_signature(pk, sig);
427	}
428
429	/*
430	* Public key algorithm asymmetric key subtype
431	*/
432	struct asymmetric_key_subtype public_key_subtype = {
433	.owner = THIS_MODULE,
434	.name = "public_key",
435	.name_len = sizeof("public_key") - 1,
436	.describe = public_key_describe,
437	.destroy = public_key_destroy,
438	.query = software_key_query,
439	.eds_op = software_key_eds_op,
440	.verify_signature = public_key_verify_signature_2,
441	};
442	EXPORT_SYMBOL_GPL(public_key_subtype);
443	#endif /* !__UBOOT__ */