[linux.git] / crypto / rsa.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* RSA asymmetric public-key algorithm [RFC3447]
 *
 * Copyright (c) 2015, Intel Corporation
 * Authors: Tadeusz Struk <[email protected]>
 */

#include <linux/fips.h>
#include <linux/module.h>
#include <linux/mpi.h>
#include <crypto/internal/rsa.h>
#include <crypto/internal/akcipher.h>
#include <crypto/akcipher.h>
#include <crypto/algapi.h>

struct rsa_mpi_key {
	MPI n;
	MPI e;
	MPI d;
	MPI p;
	MPI q;
	MPI dp;
	MPI dq;
	MPI qinv;
};

static int rsa_check_payload(MPI x, MPI n)
{
	MPI n1;

	if (mpi_cmp_ui(x, 1) <= 0)
		return -EINVAL;

	n1 = mpi_alloc(0);
	if (!n1)
		return -ENOMEM;

	if (mpi_sub_ui(n1, n, 1) || mpi_cmp(x, n1) >= 0) {
		mpi_free(n1);
		return -EINVAL;
	}

	mpi_free(n1);
	return 0;
}

/*
 * RSAEP function [RFC3447 sec 5.1.1]
 * c = m^e mod n;
 */
static int _rsa_enc(const struct rsa_mpi_key *key, MPI c, MPI m)
{
	/*
	 * Even though (1) in RFC3447 only requires 0 <= m <= n - 1, we are
	 * slightly more conservative and require 1 < m < n - 1. This is in line
	 * with SP 800-56Br2, Section 7.1.1.
	 */
	if (rsa_check_payload(m, key->n))
		return -EINVAL;

	/* (2) c = m^e mod n */
	return mpi_powm(c, m, key->e, key->n);
}

/*
 * RSADP function [RFC3447 sec 5.1.2]
 * m_1 = c^dP mod p;
 * m_2 = c^dQ mod q;
 * h = (m_1 - m_2) * qInv mod p;
 * m = m_2 + q * h;
 */
static int _rsa_dec_crt(const struct rsa_mpi_key *key, MPI m_or_m1_or_h, MPI c)
{
	MPI m2, m12_or_qh;
	int ret = -ENOMEM;

	/*
	 * Even though (1) in RFC3447 only requires 0 <= c <= n - 1, we are
	 * slightly more conservative and require 1 < c < n - 1. This is in line
	 * with SP 800-56Br2, Section 7.1.2.
	 */
	if (rsa_check_payload(c, key->n))
		return -EINVAL;

	m2 = mpi_alloc(0);
	m12_or_qh = mpi_alloc(0);
	if (!m2 || !m12_or_qh)
		goto err_free_mpi;

	/* (2i) m_1 = c^dP mod p */
	ret = mpi_powm(m_or_m1_or_h, c, key->dp, key->p);
	if (ret)
		goto err_free_mpi;

	/* (2i) m_2 = c^dQ mod q */
	ret = mpi_powm(m2, c, key->dq, key->q);
	if (ret)
		goto err_free_mpi;

	/* (2iii) h = (m_1 - m_2) * qInv mod p */
	mpi_sub(m12_or_qh, m_or_m1_or_h, m2);
	mpi_mulm(m_or_m1_or_h, m12_or_qh, key->qinv, key->p);

	/* (2iv) m = m_2 + q * h */
	mpi_mul(m12_or_qh, key->q, m_or_m1_or_h);
	mpi_addm(m_or_m1_or_h, m2, m12_or_qh, key->n);

	ret = 0;

err_free_mpi:
	mpi_free(m12_or_qh);
	mpi_free(m2);
	return ret;
}

static inline struct rsa_mpi_key *rsa_get_key(struct crypto_akcipher *tfm)
{
	return akcipher_tfm_ctx(tfm);
}

static int rsa_enc(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
	MPI m, c = mpi_alloc(0);
	int ret = 0;
	int sign;

	if (!c)
		return -ENOMEM;

	if (unlikely(!pkey->n || !pkey->e)) {
		ret = -EINVAL;
		goto err_free_c;
	}

	ret = -ENOMEM;
	m = mpi_read_raw_from_sgl(req->src, req->src_len);
	if (!m)
		goto err_free_c;

	ret = _rsa_enc(pkey, c, m);
	if (ret)
		goto err_free_m;

	ret = mpi_write_to_sgl(c, req->dst, req->dst_len, &sign);
	if (ret)
		goto err_free_m;

	if (sign < 0)
		ret = -EBADMSG;

err_free_m:
	mpi_free(m);
err_free_c:
	mpi_free(c);
	return ret;
}

static int rsa_dec(struct akcipher_request *req)
{
	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
	const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
	MPI c, m = mpi_alloc(0);
	int ret = 0;
	int sign;

	if (!m)
		return -ENOMEM;

	if (unlikely(!pkey->n || !pkey->d)) {
		ret = -EINVAL;
		goto err_free_m;
	}

	ret = -ENOMEM;
	c = mpi_read_raw_from_sgl(req->src, req->src_len);
	if (!c)
		goto err_free_m;

	ret = _rsa_dec_crt(pkey, m, c);
	if (ret)
		goto err_free_c;

	ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign);
	if (ret)
		goto err_free_c;

	if (sign < 0)
		ret = -EBADMSG;
err_free_c:
	mpi_free(c);
err_free_m:
	mpi_free(m);
	return ret;
}

static void rsa_free_mpi_key(struct rsa_mpi_key *key)
{
	mpi_free(key->d);
	mpi_free(key->e);
	mpi_free(key->n);
	mpi_free(key->p);
	mpi_free(key->q);
	mpi_free(key->dp);
	mpi_free(key->dq);
	mpi_free(key->qinv);
	key->d = NULL;
	key->e = NULL;
	key->n = NULL;
	key->p = NULL;
	key->q = NULL;
	key->dp = NULL;
	key->dq = NULL;
	key->qinv = NULL;
}

static int rsa_check_key_length(unsigned int len)
{
	switch (len) {
	case 512:
	case 1024:
	case 1536:
		if (fips_enabled)
			return -EINVAL;
		fallthrough;
	case 2048:
	case 3072:
	case 4096:
		return 0;
	}

	return -EINVAL;
}

static int rsa_check_exponent_fips(MPI e)
{
	MPI e_max = NULL;

	/* check if odd */
	if (!mpi_test_bit(e, 0)) {
		return -EINVAL;
	}

	/* check if 2^16 < e < 2^256. */
	if (mpi_cmp_ui(e, 65536) <= 0) {
		return -EINVAL;
	}

	e_max = mpi_alloc(0);
	if (!e_max)
		return -ENOMEM;
	mpi_set_bit(e_max, 256);

	if (mpi_cmp(e, e_max) >= 0) {
		mpi_free(e_max);
		return -EINVAL;
	}

	mpi_free(e_max);
	return 0;
}

static int rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
			   unsigned int keylen)
{
	struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
	struct rsa_key raw_key = {0};
	int ret;

	/* Free the old MPI key if any */
	rsa_free_mpi_key(mpi_key);

	ret = rsa_parse_pub_key(&raw_key, key, keylen);
	if (ret)
		return ret;

	mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
	if (!mpi_key->e)
		goto err;

	mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
	if (!mpi_key->n)
		goto err;

	if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
		rsa_free_mpi_key(mpi_key);
		return -EINVAL;
	}

	if (fips_enabled && rsa_check_exponent_fips(mpi_key->e)) {
		rsa_free_mpi_key(mpi_key);
		return -EINVAL;
	}

	return 0;

err:
	rsa_free_mpi_key(mpi_key);
	return -ENOMEM;
}

static int rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
			    unsigned int keylen)
{
	struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
	struct rsa_key raw_key = {0};
	int ret;

	/* Free the old MPI key if any */
	rsa_free_mpi_key(mpi_key);

	ret = rsa_parse_priv_key(&raw_key, key, keylen);
	if (ret)
		return ret;

	mpi_key->d = mpi_read_raw_data(raw_key.d, raw_key.d_sz);
	if (!mpi_key->d)
		goto err;

	mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
	if (!mpi_key->e)
		goto err;

	mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
	if (!mpi_key->n)
		goto err;

	mpi_key->p = mpi_read_raw_data(raw_key.p, raw_key.p_sz);
	if (!mpi_key->p)
		goto err;

	mpi_key->q = mpi_read_raw_data(raw_key.q, raw_key.q_sz);
	if (!mpi_key->q)
		goto err;

	mpi_key->dp = mpi_read_raw_data(raw_key.dp, raw_key.dp_sz);
	if (!mpi_key->dp)
		goto err;

	mpi_key->dq = mpi_read_raw_data(raw_key.dq, raw_key.dq_sz);
	if (!mpi_key->dq)
		goto err;

	mpi_key->qinv = mpi_read_raw_data(raw_key.qinv, raw_key.qinv_sz);
	if (!mpi_key->qinv)
		goto err;

	if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
		rsa_free_mpi_key(mpi_key);
		return -EINVAL;
	}

	if (fips_enabled && rsa_check_exponent_fips(mpi_key->e)) {
		rsa_free_mpi_key(mpi_key);
		return -EINVAL;
	}

	return 0;

err:
	rsa_free_mpi_key(mpi_key);
	return -ENOMEM;
}

static unsigned int rsa_max_size(struct crypto_akcipher *tfm)
{
	struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);

	return mpi_get_size(pkey->n);
}

static void rsa_exit_tfm(struct crypto_akcipher *tfm)
{
	struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);

	rsa_free_mpi_key(pkey);
}

static struct akcipher_alg rsa = {
	.encrypt = rsa_enc,
	.decrypt = rsa_dec,
	.set_priv_key = rsa_set_priv_key,
	.set_pub_key = rsa_set_pub_key,
	.max_size = rsa_max_size,
	.exit = rsa_exit_tfm,
	.base = {
		.cra_name = "rsa",
		.cra_driver_name = "rsa-generic",
		.cra_priority = 100,
		.cra_module = THIS_MODULE,
		.cra_ctxsize = sizeof(struct rsa_mpi_key),
	},
};

static int __init rsa_init(void)
{
	int err;

	err = crypto_register_akcipher(&rsa);
	if (err)
		return err;

	err = crypto_register_template(&rsa_pkcs1pad_tmpl);
	if (err) {
		crypto_unregister_akcipher(&rsa);
		return err;
	}

	return 0;
}

static void __exit rsa_exit(void)
{
	crypto_unregister_template(&rsa_pkcs1pad_tmpl);
	crypto_unregister_akcipher(&rsa);
}

subsys_initcall(rsa_init);
module_exit(rsa_exit);
MODULE_ALIAS_CRYPTO("rsa");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("RSA generic algorithm");
Commit	Line	Data
b4d0d230	1	// SPDX-License-Identifier: GPL-2.0-or-later
cfc2bb32 TS	2	/* RSA asymmetric public-key algorithm [RFC3447]
	3	*
	4	* Copyright (c) 2015, Intel Corporation
	5	* Authors: Tadeusz Struk <[email protected]>
cfc2bb32 TS	6	*/
cfc2bb32 TS	7
1ce1bacc	8	#include <linux/fips.h>
cfc2bb32	9	#include <linux/module.h>
5a7de973	10	#include <linux/mpi.h>
cfc2bb32 TS	11	#include <crypto/internal/rsa.h>
	12	#include <crypto/internal/akcipher.h>
	13	#include <crypto/akcipher.h>
3d5b1ecd	14	#include <crypto/algapi.h>
cfc2bb32	15
5a7de973 TA	16	struct rsa_mpi_key {
	17	MPI n;
	18	MPI e;
	19	MPI d;
f145d411 IK	20	MPI p;
	21	MPI q;
	22	MPI dp;
	23	MPI dq;
	24	MPI qinv;
5a7de973 TA	25	};
5a7de973 TA	26
e8829ef1 JV	27	static int rsa_check_payload(MPI x, MPI n)
	28	{
	29	MPI n1;
	30
	31	if (mpi_cmp_ui(x, 1) <= 0)
	32	return -EINVAL;
	33
	34	n1 = mpi_alloc(0);
	35	if (!n1)
	36	return -ENOMEM;
	37
	38	if (mpi_sub_ui(n1, n, 1) \|\| mpi_cmp(x, n1) >= 0) {
	39	mpi_free(n1);
	40	return -EINVAL;
	41	}
	42
	43	mpi_free(n1);
	44	return 0;
	45	}
	46
cfc2bb32 TS	47	/*
	48	* RSAEP function [RFC3447 sec 5.1.1]
	49	* c = m^e mod n;
	50	*/
5a7de973	51	static int _rsa_enc(const struct rsa_mpi_key *key, MPI c, MPI m)
cfc2bb32	52	{
e8829ef1 JV	53	/*
	54	* Even though (1) in RFC3447 only requires 0 <= m <= n - 1, we are
	55	* slightly more conservative and require 1 < m < n - 1. This is in line
	56	* with SP 800-56Br2, Section 7.1.1.
	57	*/
	58	if (rsa_check_payload(m, key->n))
cfc2bb32 TS	59	return -EINVAL;
	60
	61	/* (2) c = m^e mod n */
	62	return mpi_powm(c, m, key->e, key->n);
	63	}
	64
	65	/*
	66	* RSADP function [RFC3447 sec 5.1.2]
f145d411 IK	67	* m_1 = c^dP mod p;
	68	* m_2 = c^dQ mod q;
	69	* h = (m_1 - m_2) * qInv mod p;
	70	* m = m_2 + q * h;
cfc2bb32	71	*/
f145d411	72	static int _rsa_dec_crt(const struct rsa_mpi_key *key, MPI m_or_m1_or_h, MPI c)
cfc2bb32	73	{
f145d411 IK	74	MPI m2, m12_or_qh;
	75	int ret = -ENOMEM;
	76
e8829ef1 JV	77	/*
	78	* Even though (1) in RFC3447 only requires 0 <= c <= n - 1, we are
	79	* slightly more conservative and require 1 < c < n - 1. This is in line
	80	* with SP 800-56Br2, Section 7.1.2.
	81	*/
	82	if (rsa_check_payload(c, key->n))
cfc2bb32 TS	83	return -EINVAL;
cfc2bb32 TS	84
f145d411 IK	85	m2 = mpi_alloc(0);
	86	m12_or_qh = mpi_alloc(0);
	87	if (!m2 \|\| !m12_or_qh)
	88	goto err_free_mpi;
	89
	90	/* (2i) m_1 = c^dP mod p */
	91	ret = mpi_powm(m_or_m1_or_h, c, key->dp, key->p);
	92	if (ret)
	93	goto err_free_mpi;
	94
	95	/* (2i) m_2 = c^dQ mod q */
	96	ret = mpi_powm(m2, c, key->dq, key->q);
	97	if (ret)
	98	goto err_free_mpi;
	99
	100	/* (2iii) h = (m_1 - m_2) * qInv mod p */
	101	mpi_sub(m12_or_qh, m_or_m1_or_h, m2);
	102	mpi_mulm(m_or_m1_or_h, m12_or_qh, key->qinv, key->p);
	103
	104	/* (2iv) m = m_2 + q * h */
	105	mpi_mul(m12_or_qh, key->q, m_or_m1_or_h);
	106	mpi_addm(m_or_m1_or_h, m2, m12_or_qh, key->n);
	107
	108	ret = 0;
	109
	110	err_free_mpi:
	111	mpi_free(m12_or_qh);
	112	mpi_free(m2);
	113	return ret;
cfc2bb32 TS	114	}
cfc2bb32 TS	115
5a7de973	116	static inline struct rsa_mpi_key rsa_get_key(struct crypto_akcipher tfm)
cfc2bb32 TS	117	{
	118	return akcipher_tfm_ctx(tfm);
	119	}
	120
	121	static int rsa_enc(struct akcipher_request *req)
	122	{
	123	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
5a7de973	124	const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
cfc2bb32 TS	125	MPI m, c = mpi_alloc(0);
	126	int ret = 0;
	127	int sign;
	128
	129	if (!c)
	130	return -ENOMEM;
	131
	132	if (unlikely(!pkey->n \|\| !pkey->e)) {
	133	ret = -EINVAL;
	134	goto err_free_c;
	135	}
	136
22287b0b TS	137	ret = -ENOMEM;
	138	m = mpi_read_raw_from_sgl(req->src, req->src_len);
	139	if (!m)
cfc2bb32	140	goto err_free_c;
cfc2bb32 TS	141
	142	ret = _rsa_enc(pkey, c, m);
	143	if (ret)
	144	goto err_free_m;
	145
9b45b7bb	146	ret = mpi_write_to_sgl(c, req->dst, req->dst_len, &sign);
cfc2bb32 TS	147	if (ret)
	148	goto err_free_m;
	149
22287b0b	150	if (sign < 0)
cfc2bb32	151	ret = -EBADMSG;
cfc2bb32 TS	152
	153	err_free_m:
	154	mpi_free(m);
	155	err_free_c:
	156	mpi_free(c);
	157	return ret;
	158	}
	159
	160	static int rsa_dec(struct akcipher_request *req)
	161	{
	162	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
5a7de973	163	const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
cfc2bb32 TS	164	MPI c, m = mpi_alloc(0);
	165	int ret = 0;
	166	int sign;
	167
	168	if (!m)
	169	return -ENOMEM;
	170
	171	if (unlikely(!pkey->n \|\| !pkey->d)) {
	172	ret = -EINVAL;
	173	goto err_free_m;
	174	}
	175
22287b0b TS	176	ret = -ENOMEM;
	177	c = mpi_read_raw_from_sgl(req->src, req->src_len);
	178	if (!c)
cfc2bb32	179	goto err_free_m;
cfc2bb32	180
f145d411	181	ret = _rsa_dec_crt(pkey, m, c);
cfc2bb32 TS	182	if (ret)
	183	goto err_free_c;
	184
9b45b7bb	185	ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign);
cfc2bb32 TS	186	if (ret)
	187	goto err_free_c;
	188
22287b0b	189	if (sign < 0)
cfc2bb32	190	ret = -EBADMSG;
cfc2bb32 TS	191	err_free_c:
	192	mpi_free(c);
	193	err_free_m:
	194	mpi_free(m);
	195	return ret;
	196	}
	197
5a7de973 TA	198	static void rsa_free_mpi_key(struct rsa_mpi_key *key)
	199	{
	200	mpi_free(key->d);
	201	mpi_free(key->e);
	202	mpi_free(key->n);
f145d411 IK	203	mpi_free(key->p);
	204	mpi_free(key->q);
	205	mpi_free(key->dp);
	206	mpi_free(key->dq);
	207	mpi_free(key->qinv);
5a7de973 TA	208	key->d = NULL;
	209	key->e = NULL;
	210	key->n = NULL;
f145d411 IK	211	key->p = NULL;
	212	key->q = NULL;
	213	key->dp = NULL;
	214	key->dq = NULL;
	215	key->qinv = NULL;
5a7de973 TA	216	}
5a7de973 TA	217
6e8ec66c TS	218	static int rsa_check_key_length(unsigned int len)
	219	{
	220	switch (len) {
	221	case 512:
	222	case 1024:
	223	case 1536:
1ce1bacc SM	224	if (fips_enabled)
	225	return -EINVAL;
	226	fallthrough;
6e8ec66c TS	227	case 2048:
	228	case 3072:
	229	case 4096:
	230	return 0;
	231	}
	232
	233	return -EINVAL;
	234	}
	235
6637e11e MA	236	static int rsa_check_exponent_fips(MPI e)
	237	{
	238	MPI e_max = NULL;
	239
	240	/* check if odd */
	241	if (!mpi_test_bit(e, 0)) {
	242	return -EINVAL;
	243	}
	244
	245	/* check if 2^16 < e < 2^256. */
	246	if (mpi_cmp_ui(e, 65536) <= 0) {
	247	return -EINVAL;
	248	}
	249
	250	e_max = mpi_alloc(0);
d872ca16 DC	251	if (!e_max)
d872ca16 DC	252	return -ENOMEM;
6637e11e MA	253	mpi_set_bit(e_max, 256);
	254
	255	if (mpi_cmp(e, e_max) >= 0) {
	256	mpi_free(e_max);
	257	return -EINVAL;
	258	}
	259
	260	mpi_free(e_max);
	261	return 0;
	262	}
	263
22287b0b TS	264	static int rsa_set_pub_key(struct crypto_akcipher tfm, const void key,
22287b0b TS	265	unsigned int keylen)
cfc2bb32	266	{
5a7de973 TA	267	struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
5a7de973 TA	268	struct rsa_key raw_key = {0};
6e8ec66c	269	int ret;
cfc2bb32	270
5a7de973 TA	271	/* Free the old MPI key if any */
	272	rsa_free_mpi_key(mpi_key);
	273
	274	ret = rsa_parse_pub_key(&raw_key, key, keylen);
6e8ec66c TS	275	if (ret)
	276	return ret;
	277
5a7de973 TA	278	mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
	279	if (!mpi_key->e)
	280	goto err;
	281
	282	mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
	283	if (!mpi_key->n)
	284	goto err;
	285
	286	if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
	287	rsa_free_mpi_key(mpi_key);
	288	return -EINVAL;
6e8ec66c	289	}
5a7de973	290
6637e11e MA	291	if (fips_enabled && rsa_check_exponent_fips(mpi_key->e)) {
	292	rsa_free_mpi_key(mpi_key);
	293	return -EINVAL;
	294	}
	295
5a7de973 TA	296	return 0;
	297
	298	err:
	299	rsa_free_mpi_key(mpi_key);
	300	return -ENOMEM;
cfc2bb32 TS	301	}
cfc2bb32 TS	302
22287b0b TS	303	static int rsa_set_priv_key(struct crypto_akcipher tfm, const void key,
	304	unsigned int keylen)
	305	{
5a7de973 TA	306	struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
5a7de973 TA	307	struct rsa_key raw_key = {0};
22287b0b TS	308	int ret;
22287b0b TS	309
5a7de973 TA	310	/* Free the old MPI key if any */
	311	rsa_free_mpi_key(mpi_key);
	312
	313	ret = rsa_parse_priv_key(&raw_key, key, keylen);
22287b0b TS	314	if (ret)
	315	return ret;
	316
5a7de973 TA	317	mpi_key->d = mpi_read_raw_data(raw_key.d, raw_key.d_sz);
	318	if (!mpi_key->d)
	319	goto err;
	320
	321	mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
	322	if (!mpi_key->e)
	323	goto err;
	324
	325	mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
	326	if (!mpi_key->n)
	327	goto err;
	328
f145d411 IK	329	mpi_key->p = mpi_read_raw_data(raw_key.p, raw_key.p_sz);
	330	if (!mpi_key->p)
	331	goto err;
	332
	333	mpi_key->q = mpi_read_raw_data(raw_key.q, raw_key.q_sz);
	334	if (!mpi_key->q)
	335	goto err;
	336
	337	mpi_key->dp = mpi_read_raw_data(raw_key.dp, raw_key.dp_sz);
	338	if (!mpi_key->dp)
	339	goto err;
	340
	341	mpi_key->dq = mpi_read_raw_data(raw_key.dq, raw_key.dq_sz);
	342	if (!mpi_key->dq)
	343	goto err;
	344
	345	mpi_key->qinv = mpi_read_raw_data(raw_key.qinv, raw_key.qinv_sz);
	346	if (!mpi_key->qinv)
	347	goto err;
	348
5a7de973 TA	349	if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
	350	rsa_free_mpi_key(mpi_key);
	351	return -EINVAL;
22287b0b	352	}
5a7de973	353
6637e11e MA	354	if (fips_enabled && rsa_check_exponent_fips(mpi_key->e)) {
	355	rsa_free_mpi_key(mpi_key);
	356	return -EINVAL;
	357	}
	358
5a7de973 TA	359	return 0;
	360
	361	err:
	362	rsa_free_mpi_key(mpi_key);
	363	return -ENOMEM;
22287b0b TS	364	}
22287b0b TS	365
1c23b466	366	static unsigned int rsa_max_size(struct crypto_akcipher *tfm)
22287b0b	367	{
5a7de973	368	struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);
22287b0b	369
1c23b466	370	return mpi_get_size(pkey->n);
22287b0b TS	371	}
22287b0b TS	372
cfc2bb32 TS	373	static void rsa_exit_tfm(struct crypto_akcipher *tfm)
cfc2bb32 TS	374	{
5a7de973	375	struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);
cfc2bb32	376
5a7de973	377	rsa_free_mpi_key(pkey);
cfc2bb32 TS	378	}
	379
	380	static struct akcipher_alg rsa = {
	381	.encrypt = rsa_enc,
	382	.decrypt = rsa_dec,
22287b0b TS	383	.set_priv_key = rsa_set_priv_key,
	384	.set_pub_key = rsa_set_pub_key,
	385	.max_size = rsa_max_size,
cfc2bb32 TS	386	.exit = rsa_exit_tfm,
	387	.base = {
	388	.cra_name = "rsa",
	389	.cra_driver_name = "rsa-generic",
	390	.cra_priority = 100,
	391	.cra_module = THIS_MODULE,
5a7de973	392	.cra_ctxsize = sizeof(struct rsa_mpi_key),
cfc2bb32 TS	393	},
	394	};
	395
33837be3	396	static int __init rsa_init(void)
cfc2bb32	397	{
3d5b1ecd AZ	398	int err;
	399
	400	err = crypto_register_akcipher(&rsa);
	401	if (err)
	402	return err;
	403
	404	err = crypto_register_template(&rsa_pkcs1pad_tmpl);
	405	if (err) {
	406	crypto_unregister_akcipher(&rsa);
	407	return err;
	408	}
	409
	410	return 0;
cfc2bb32 TS	411	}
cfc2bb32 TS	412
33837be3	413	static void __exit rsa_exit(void)
cfc2bb32	414	{
3d5b1ecd	415	crypto_unregister_template(&rsa_pkcs1pad_tmpl);
cfc2bb32 TS	416	crypto_unregister_akcipher(&rsa);
	417	}
	418
c4741b23	419	subsys_initcall(rsa_init);
cfc2bb32 TS	420	module_exit(rsa_exit);
	421	MODULE_ALIAS_CRYPTO("rsa");
	422	MODULE_LICENSE("GPL");
	423	MODULE_DESCRIPTION("RSA generic algorithm");