Fix #912
[proxmark3-svn] / common / mbedtls / rsa_internal.h
1 /**
2 * \file rsa_internal.h
3 *
4 * \brief Context-independent RSA helper functions
5 *
6 * This module declares some RSA-related helper functions useful when
7 * implementing the RSA interface. These functions are provided in a separate
8 * compilation unit in order to make it easy for designers of alternative RSA
9 * implementations to use them in their own code, as it is conceived that the
10 * functionality they provide will be necessary for most complete
11 * implementations.
12 *
13 * End-users of Mbed TLS who are not providing their own alternative RSA
14 * implementations should not use these functions directly, and should instead
15 * use only the functions declared in rsa.h.
16 *
17 * The interface provided by this module will be maintained through LTS (Long
18 * Term Support) branches of Mbed TLS, but may otherwise be subject to change,
19 * and must be considered an internal interface of the library.
20 *
21 * There are two classes of helper functions:
22 *
23 * (1) Parameter-generating helpers. These are:
24 * - mbedtls_rsa_deduce_primes
25 * - mbedtls_rsa_deduce_private_exponent
26 * - mbedtls_rsa_deduce_crt
27 * Each of these functions takes a set of core RSA parameters and
28 * generates some other, or CRT related parameters.
29 *
30 * (2) Parameter-checking helpers. These are:
31 * - mbedtls_rsa_validate_params
32 * - mbedtls_rsa_validate_crt
33 * They take a set of core or CRT related RSA parameters and check their
34 * validity.
35 *
36 */
37 /*
38 * Copyright (C) 2006-2017, ARM Limited, All Rights Reserved
39 * SPDX-License-Identifier: GPL-2.0
40 *
41 * This program is free software; you can redistribute it and/or modify
42 * it under the terms of the GNU General Public License as published by
43 * the Free Software Foundation; either version 2 of the License, or
44 * (at your option) any later version.
45 *
46 * This program is distributed in the hope that it will be useful,
47 * but WITHOUT ANY WARRANTY; without even the implied warranty of
48 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
49 * GNU General Public License for more details.
50 *
51 * You should have received a copy of the GNU General Public License along
52 * with this program; if not, write to the Free Software Foundation, Inc.,
53 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
54 *
55 * This file is part of mbed TLS (https://tls.mbed.org)
56 *
57 */
58
59 #ifndef MBEDTLS_RSA_INTERNAL_H
60 #define MBEDTLS_RSA_INTERNAL_H
61
62 #if !defined(MBEDTLS_CONFIG_FILE)
63 #include "config.h"
64 #else
65 #include MBEDTLS_CONFIG_FILE
66 #endif
67
68 #include "bignum.h"
69
70 #ifdef __cplusplus
71 extern "C" {
72 #endif
73
74
75 /**
76 * \brief Compute RSA prime moduli P, Q from public modulus N=PQ
77 * and a pair of private and public key.
78 *
79 * \note This is a 'static' helper function not operating on
80 * an RSA context. Alternative implementations need not
81 * overwrite it.
82 *
83 * \param N RSA modulus N = PQ, with P, Q to be found
84 * \param E RSA public exponent
85 * \param D RSA private exponent
86 * \param P Pointer to MPI holding first prime factor of N on success
87 * \param Q Pointer to MPI holding second prime factor of N on success
88 *
89 * \return
90 * - 0 if successful. In this case, P and Q constitute a
91 * factorization of N.
92 * - A non-zero error code otherwise.
93 *
94 * \note It is neither checked that P, Q are prime nor that
95 * D, E are modular inverses wrt. P-1 and Q-1. For that,
96 * use the helper function \c mbedtls_rsa_validate_params.
97 *
98 */
99 int mbedtls_rsa_deduce_primes( mbedtls_mpi const *N, mbedtls_mpi const *E,
100 mbedtls_mpi const *D,
101 mbedtls_mpi *P, mbedtls_mpi *Q );
102
103 /**
104 * \brief Compute RSA private exponent from
105 * prime moduli and public key.
106 *
107 * \note This is a 'static' helper function not operating on
108 * an RSA context. Alternative implementations need not
109 * overwrite it.
110 *
111 * \param P First prime factor of RSA modulus
112 * \param Q Second prime factor of RSA modulus
113 * \param E RSA public exponent
114 * \param D Pointer to MPI holding the private exponent on success.
115 *
116 * \return
117 * - 0 if successful. In this case, D is set to a simultaneous
118 * modular inverse of E modulo both P-1 and Q-1.
119 * - A non-zero error code otherwise.
120 *
121 * \note This function does not check whether P and Q are primes.
122 *
123 */
124 int mbedtls_rsa_deduce_private_exponent( mbedtls_mpi const *P,
125 mbedtls_mpi const *Q,
126 mbedtls_mpi const *E,
127 mbedtls_mpi *D );
128
129
130 /**
131 * \brief Generate RSA-CRT parameters
132 *
133 * \note This is a 'static' helper function not operating on
134 * an RSA context. Alternative implementations need not
135 * overwrite it.
136 *
137 * \param P First prime factor of N
138 * \param Q Second prime factor of N
139 * \param D RSA private exponent
140 * \param DP Output variable for D modulo P-1
141 * \param DQ Output variable for D modulo Q-1
142 * \param QP Output variable for the modular inverse of Q modulo P.
143 *
144 * \return 0 on success, non-zero error code otherwise.
145 *
146 * \note This function does not check whether P, Q are
147 * prime and whether D is a valid private exponent.
148 *
149 */
150 int mbedtls_rsa_deduce_crt( const mbedtls_mpi *P, const mbedtls_mpi *Q,
151 const mbedtls_mpi *D, mbedtls_mpi *DP,
152 mbedtls_mpi *DQ, mbedtls_mpi *QP );
153
154
155 /**
156 * \brief Check validity of core RSA parameters
157 *
158 * \note This is a 'static' helper function not operating on
159 * an RSA context. Alternative implementations need not
160 * overwrite it.
161 *
162 * \param N RSA modulus N = PQ
163 * \param P First prime factor of N
164 * \param Q Second prime factor of N
165 * \param D RSA private exponent
166 * \param E RSA public exponent
167 * \param f_rng PRNG to be used for primality check, or NULL
168 * \param p_rng PRNG context for f_rng, or NULL
169 *
170 * \return
171 * - 0 if the following conditions are satisfied
172 * if all relevant parameters are provided:
173 * - P prime if f_rng != NULL (%)
174 * - Q prime if f_rng != NULL (%)
175 * - 1 < N = P * Q
176 * - 1 < D, E < N
177 * - D and E are modular inverses modulo P-1 and Q-1
178 * (%) This is only done if MBEDTLS_GENPRIME is defined.
179 * - A non-zero error code otherwise.
180 *
181 * \note The function can be used with a restricted set of arguments
182 * to perform specific checks only. E.g., calling it with
183 * (-,P,-,-,-) and a PRNG amounts to a primality check for P.
184 */
185 int mbedtls_rsa_validate_params( const mbedtls_mpi *N, const mbedtls_mpi *P,
186 const mbedtls_mpi *Q, const mbedtls_mpi *D,
187 const mbedtls_mpi *E,
188 int (*f_rng)(void *, unsigned char *, size_t),
189 void *p_rng );
190
191 /**
192 * \brief Check validity of RSA CRT parameters
193 *
194 * \note This is a 'static' helper function not operating on
195 * an RSA context. Alternative implementations need not
196 * overwrite it.
197 *
198 * \param P First prime factor of RSA modulus
199 * \param Q Second prime factor of RSA modulus
200 * \param D RSA private exponent
201 * \param DP MPI to check for D modulo P-1
202 * \param DQ MPI to check for D modulo P-1
203 * \param QP MPI to check for the modular inverse of Q modulo P.
204 *
205 * \return
206 * - 0 if the following conditions are satisfied:
207 * - D = DP mod P-1 if P, D, DP != NULL
208 * - Q = DQ mod P-1 if P, D, DQ != NULL
209 * - QP = Q^-1 mod P if P, Q, QP != NULL
210 * - \c MBEDTLS_ERR_RSA_KEY_CHECK_FAILED if check failed,
211 * potentially including \c MBEDTLS_ERR_MPI_XXX if some
212 * MPI calculations failed.
213 * - \c MBEDTLS_ERR_RSA_BAD_INPUT_DATA if insufficient
214 * data was provided to check DP, DQ or QP.
215 *
216 * \note The function can be used with a restricted set of arguments
217 * to perform specific checks only. E.g., calling it with the
218 * parameters (P, -, D, DP, -, -) will check DP = D mod P-1.
219 */
220 int mbedtls_rsa_validate_crt( const mbedtls_mpi *P, const mbedtls_mpi *Q,
221 const mbedtls_mpi *D, const mbedtls_mpi *DP,
222 const mbedtls_mpi *DQ, const mbedtls_mpi *QP );
223
224 #ifdef __cplusplus
225 }
226 #endif
227
228 #endif /* rsa_internal.h */
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