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Release 4.11 crypto/rsa.c

Directory: crypto
/* RSA asymmetric public-key algorithm [RFC3447]
 *
 * Copyright (c) 2015, Intel Corporation
 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#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;
};

/*
 * 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) { /* (1) Validate 0 <= m < n */ if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0) return -EINVAL; /* (2) c = m^e mod n */ return mpi_powm(c, m, key->e, key->n); }

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Tadeusz Struk6198.39%150.00%
Tudor Ambarus11.61%150.00%
Total62100.00%2100.00%

/* * RSADP function [RFC3447 sec 5.1.2] * m = c^d mod n; */
static int _rsa_dec(const struct rsa_mpi_key *key, MPI m, MPI c) { /* (1) Validate 0 <= c < n */ if (mpi_cmp_ui(c, 0) < 0 || mpi_cmp(c, key->n) >= 0) return -EINVAL; /* (2) m = c^d mod n */ return mpi_powm(m, c, key->d, key->n); }

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Tadeusz Struk6198.39%150.00%
Tudor Ambarus11.61%150.00%
Total62100.00%2100.00%

/* * RSASP1 function [RFC3447 sec 5.2.1] * s = m^d mod n */
static int _rsa_sign(const struct rsa_mpi_key *key, MPI s, MPI m) { /* (1) Validate 0 <= m < n */ if (mpi_cmp_ui(m, 0) < 0 || mpi_cmp(m, key->n) >= 0) return -EINVAL; /* (2) s = m^d mod n */ return mpi_powm(s, m, key->d, key->n); }

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Tadeusz Struk6198.39%150.00%
Tudor Ambarus11.61%150.00%
Total62100.00%2100.00%

/* * RSAVP1 function [RFC3447 sec 5.2.2] * m = s^e mod n; */
static int _rsa_verify(const struct rsa_mpi_key *key, MPI m, MPI s) { /* (1) Validate 0 <= s < n */ if (mpi_cmp_ui(s, 0) < 0 || mpi_cmp(s, key->n) >= 0) return -EINVAL; /* (2) m = s^e mod n */ return mpi_powm(m, s, key->e, key->n); }

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Tadeusz Struk6198.39%150.00%
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static inline struct rsa_mpi_key *rsa_get_key(struct crypto_akcipher *tfm) { return akcipher_tfm_ctx(tfm); }

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Tadeusz Struk1995.00%150.00%
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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; }

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Tadeusz Struk18099.45%266.67%
Tudor Ambarus10.55%133.33%
Total181100.00%3100.00%


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(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; }

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Tadeusz Struk18099.45%266.67%
Tudor Ambarus10.55%133.33%
Total181100.00%3100.00%


static int rsa_sign(struct akcipher_request *req) { struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); const struct rsa_mpi_key *pkey = rsa_get_key(tfm); MPI m, s = mpi_alloc(0); int ret = 0; int sign; if (!s) return -ENOMEM; if (unlikely(!pkey->n || !pkey->d)) { ret = -EINVAL; goto err_free_s; } ret = -ENOMEM; m = mpi_read_raw_from_sgl(req->src, req->src_len); if (!m) goto err_free_s; ret = _rsa_sign(pkey, s, m); if (ret) goto err_free_m; ret = mpi_write_to_sgl(s, 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_s: mpi_free(s); return ret; }

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Tadeusz Struk18099.45%266.67%
Tudor Ambarus10.55%133.33%
Total181100.00%3100.00%


static int rsa_verify(struct akcipher_request *req) { struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); const struct rsa_mpi_key *pkey = rsa_get_key(tfm); MPI s, m = mpi_alloc(0); int ret = 0; int sign; if (!m) return -ENOMEM; if (unlikely(!pkey->n || !pkey->e)) { ret = -EINVAL; goto err_free_m; } ret = -ENOMEM; s = mpi_read_raw_from_sgl(req->src, req->src_len); if (!s) { ret = -ENOMEM; goto err_free_m; } ret = _rsa_verify(pkey, m, s); if (ret) goto err_free_s; ret = mpi_write_to_sgl(m, req->dst, req->dst_len, &sign); if (ret) goto err_free_s; if (sign < 0) ret = -EBADMSG; err_free_s: mpi_free(s); err_free_m: mpi_free(m); return ret; }

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Tadeusz Struk18799.47%266.67%
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Total188100.00%3100.00%


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

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

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Tadeusz Struk41100.00%1100.00%
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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; } return 0; err: rsa_free_mpi_key(mpi_key); return -ENOMEM; }

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Tudor Ambarus8554.84%150.00%
Tadeusz Struk7045.16%150.00%
Total155100.00%2100.00%


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; if (rsa_check_key_length(mpi_get_size(mpi_key->n) << 3)) { rsa_free_mpi_key(mpi_key); return -EINVAL; } return 0; err: rsa_free_mpi_key(mpi_key); return -ENOMEM; }

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Tudor Ambarus11061.11%125.00%
Tadeusz Struk7038.89%375.00%
Total180100.00%4100.00%


static int rsa_max_size(struct crypto_akcipher *tfm) { struct rsa_mpi_key *pkey = akcipher_tfm_ctx(tfm); return pkey->n ? mpi_get_size(pkey->n) : -EINVAL; }

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Tadeusz Struk3597.22%150.00%
Tudor Ambarus12.78%150.00%
Total36100.00%2100.00%


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

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Tadeusz Struk2492.31%150.00%
Tudor Ambarus27.69%150.00%
Total26100.00%2100.00%

static struct akcipher_alg rsa = { .encrypt = rsa_enc, .decrypt = rsa_dec, .sign = rsa_sign, .verify = rsa_verify, .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 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; }

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Andrzej Zaborowski3873.08%150.00%
Tadeusz Struk1426.92%150.00%
Total52100.00%2100.00%


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

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Tadeusz Struk1470.00%150.00%
Andrzej Zaborowski630.00%150.00%
Total20100.00%2100.00%

module_init(rsa_init); module_exit(rsa_exit); MODULE_ALIAS_CRYPTO("rsa"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("RSA generic algorithm");

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Tadeusz Struk138081.08%360.00%
Tudor Ambarus27516.16%120.00%
Andrzej Zaborowski472.76%120.00%
Total1702100.00%5100.00%
Directory: crypto
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