Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* RSA asymmetric public-key algorithm [RFC3447]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (c) 2015, Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/mpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <crypto/internal/rsa.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <crypto/internal/akcipher.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <crypto/akcipher.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <crypto/algapi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) struct rsa_mpi_key {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	MPI n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	MPI e;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	MPI d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * RSAEP function [RFC3447 sec 5.1.1]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * c = m^e mod n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static int _rsa_enc(const struct rsa_mpi_key *key, MPI c, MPI m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	/* (1) Validate 0 <= m < n */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	/* (2) c = m^e mod n */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	return mpi_powm(c, m, key->e, key->n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * RSADP function [RFC3447 sec 5.1.2]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * m = c^d mod n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static int _rsa_dec(const struct rsa_mpi_key *key, MPI m, MPI c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	/* (1) Validate 0 <= c < n */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	if (mpi_cmp_ui(c, 0) < 0 || mpi_cmp(c, key->n) >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	/* (2) m = c^d mod n */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	return mpi_powm(m, c, key->d, key->n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static inline struct rsa_mpi_key *rsa_get_key(struct crypto_akcipher *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	return akcipher_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static int rsa_enc(struct akcipher_request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	MPI m, c = mpi_alloc(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	int sign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	if (!c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (unlikely(!pkey->n || !pkey->e)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		goto err_free_c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	m = mpi_read_raw_from_sgl(req->src, req->src_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (!m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		goto err_free_c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	ret = _rsa_enc(pkey, c, m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		goto err_free_m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	ret = mpi_write_to_sgl(c, req->dst, req->dst_len, &sign);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		goto err_free_m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (sign < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		ret = -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) err_free_m:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	mpi_free(m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) err_free_c:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	mpi_free(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) static int rsa_dec(struct akcipher_request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	const struct rsa_mpi_key *pkey = rsa_get_key(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	MPI c, m = mpi_alloc(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	int sign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	if (!m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (unlikely(!pkey->n || !pkey->d)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		goto err_free_m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	c = mpi_read_raw_from_sgl(req->src, req->src_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	if (!c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		goto err_free_m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	ret = _rsa_dec(pkey, m, c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		goto err_free_c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		goto err_free_c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (sign < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		ret = -EBADMSG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) err_free_c:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	mpi_free(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) err_free_m:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	mpi_free(m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static void rsa_free_mpi_key(struct rsa_mpi_key *key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	mpi_free(key->d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	mpi_free(key->e);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	mpi_free(key->n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	key->d = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	key->e = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	key->n = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static int rsa_check_key_length(unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	switch (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	case 512:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	case 1024:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	case 1536:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	case 2048:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	case 3072:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	case 4096:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static int rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			   unsigned int keylen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	struct rsa_key raw_key = {0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	/* Free the old MPI key if any */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	rsa_free_mpi_key(mpi_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	ret = rsa_parse_pub_key(&raw_key, key, keylen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (!mpi_key->e)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	if (!mpi_key->n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		rsa_free_mpi_key(mpi_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	rsa_free_mpi_key(mpi_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) static int rsa_set_priv_key(struct crypto_akcipher *tfm, const void *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			    unsigned int keylen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	struct rsa_mpi_key *mpi_key = akcipher_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	struct rsa_key raw_key = {0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	/* Free the old MPI key if any */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	rsa_free_mpi_key(mpi_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	ret = rsa_parse_priv_key(&raw_key, key, keylen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	mpi_key->d = mpi_read_raw_data(raw_key.d, raw_key.d_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (!mpi_key->d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	mpi_key->e = mpi_read_raw_data(raw_key.e, raw_key.e_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (!mpi_key->e)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	mpi_key->n = mpi_read_raw_data(raw_key.n, raw_key.n_sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	if (!mpi_key->n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		rsa_free_mpi_key(mpi_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	rsa_free_mpi_key(mpi_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static unsigned int rsa_max_size(struct crypto_akcipher *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	return mpi_get_size(pkey->n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static void rsa_exit_tfm(struct crypto_akcipher *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	rsa_free_mpi_key(pkey);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static struct akcipher_alg rsa = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	.encrypt = rsa_enc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	.decrypt = rsa_dec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	.set_priv_key = rsa_set_priv_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	.set_pub_key = rsa_set_pub_key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	.max_size = rsa_max_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	.exit = rsa_exit_tfm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	.base = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		.cra_name = "rsa",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		.cra_driver_name = "rsa-generic",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		.cra_priority = 100,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		.cra_module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		.cra_ctxsize = sizeof(struct rsa_mpi_key),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static int rsa_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	err = crypto_register_akcipher(&rsa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	err = crypto_register_template(&rsa_pkcs1pad_tmpl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		crypto_unregister_akcipher(&rsa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static void rsa_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	crypto_unregister_template(&rsa_pkcs1pad_tmpl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	crypto_unregister_akcipher(&rsa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) subsys_initcall(rsa_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) module_exit(rsa_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) MODULE_ALIAS_CRYPTO("rsa");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) MODULE_DESCRIPTION("RSA generic algorithm");