1RSA_GET0_KEY(3) OpenSSL RSA_GET0_KEY(3)
2
6 RSA_set0_key, RSA_set0_factors, RSA_set0_crt_params, RSA_get0_key,
7 RSA_get0_factors, RSA_get0_crt_params, RSA_get0_n, RSA_get0_e,
8 RSA_get0_d, RSA_get0_p, RSA_get0_q, RSA_get0_dmp1, RSA_get0_dmq1,
9 RSA_get0_iqmp, RSA_get0_pss_params, RSA_clear_flags, RSA_test_flags,
10 RSA_set_flags, RSA_get0_engine, RSA_get_multi_prime_extra_count,
11 RSA_get0_multi_prime_factors, RSA_get0_multi_prime_crt_params,
12 RSA_set0_multi_prime_params, RSA_get_version - Routines for getting and
13 setting data in an RSA object
14
16 #include <openssl/rsa.h>
17 int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d);
19 int RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q);
20 int RSA_set0_crt_params(RSA *r, BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp);
21 void RSA_get0_key(const RSA *r,
22 const BIGNUM **n, const BIGNUM **e, const BIGNUM **d);
23 void RSA_get0_factors(const RSA *r, const BIGNUM **p, const BIGNUM **q);
24 void RSA_get0_crt_params(const RSA *r,
25 const BIGNUM **dmp1, const BIGNUM **dmq1,
26 const BIGNUM **iqmp);
27 const BIGNUM *RSA_get0_n(const RSA *d);
28 const BIGNUM *RSA_get0_e(const RSA *d);
29 const BIGNUM *RSA_get0_d(const RSA *d);
30 const BIGNUM *RSA_get0_p(const RSA *d);
31 const BIGNUM *RSA_get0_q(const RSA *d);
32 const BIGNUM *RSA_get0_dmp1(const RSA *r);
33 const BIGNUM *RSA_get0_dmq1(const RSA *r);
34 const BIGNUM *RSA_get0_iqmp(const RSA *r);
35 const RSA_PSS_PARAMS *RSA_get0_pss_params(const RSA *r);
36 void RSA_clear_flags(RSA *r, int flags);
37 int RSA_test_flags(const RSA *r, int flags);
38 void RSA_set_flags(RSA *r, int flags);
39 ENGINE *RSA_get0_engine(RSA *r);
40 int RSA_get_multi_prime_extra_count(const RSA *r);
41 int RSA_get0_multi_prime_factors(const RSA *r, const BIGNUM *primes[]);
42 int RSA_get0_multi_prime_crt_params(const RSA *r, const BIGNUM *exps[],
43 const BIGNUM *coeffs[]);
44 int RSA_set0_multi_prime_params(RSA *r, BIGNUM *primes[], BIGNUM *exps[],
45 BIGNUM *coeffs[], int pnum);
46 int RSA_get_version(RSA *r);
47
49 An RSA object contains the components for the public and private key,
50 n, e, d, p, q, dmp1, dmq1 and iqmp. n is the modulus common to both
51 public and private key, e is the public exponent and d is the private
52 exponent. p, q, dmp1, dmq1 and iqmp are the factors for the second
53 representation of a private key (see PKCS#1 section 3 Key Types), where
54 p and q are the first and second factor of n and dmp1, dmq1 and iqmp
55 are the exponents and coefficient for CRT calculations.
56 For multi-prime RSA (defined in RFC 8017), there are also one or more
58 'triplet' in an RSA object. A triplet contains three members, r, d and
59 t. r is the additional prime besides p and q. d and t are the exponent
60 and coefficient for CRT calculations.
61 The n, e and d parameters can be obtained by calling RSA_get0_key().
63 If they have not been set yet, then *n, *e and *d will be set to NULL.
64 Otherwise, they are set to pointers to their respective values. These
65 point directly to the internal representations of the values and
66 therefore should not be freed by the caller.
67 The n, e and d parameter values can be set by calling RSA_set0_key()
69 and passing the new values for n, e and d as parameters to the
70 function. The values n and e must be non-NULL the first time this
71 function is called on a given RSA object. The value d may be NULL. On
72 subsequent calls any of these values may be NULL which means the
73 corresponding RSA field is left untouched. Calling this function
74 transfers the memory management of the values to the RSA object, and
75 therefore the values that have been passed in should not be freed by
76 the caller after this function has been called.
77 In a similar fashion, the p and q parameters can be obtained and set
79 with RSA_get0_factors() and RSA_set0_factors(), and the dmp1, dmq1 and
80 iqmp parameters can be obtained and set with RSA_get0_crt_params() and
81 RSA_set0_crt_params().
82 For RSA_get0_key(), RSA_get0_factors(), and RSA_get0_crt_params(), NULL
84 value BIGNUM ** output parameters are permitted. The functions ignore
85 NULL parameters but return values for other, non-NULL, parameters.
86 For multi-prime RSA, RSA_get0_multi_prime_factors() and
88 RSA_get0_multi_prime_params() can be used to obtain other primes and
89 related CRT parameters. The return values are stored in an array of
90 BIGNUM *. RSA_set0_multi_prime_params() sets a collect of multi-prime
91 'triplet' members (prime, exponent and coefficient) into an RSA object.
92 Any of the values n, e, d, p, q, dmp1, dmq1, and iqmp can also be
94 retrieved separately by the corresponding function RSA_get0_n(),
95 RSA_get0_e(), RSA_get0_d(), RSA_get0_p(), RSA_get0_q(),
96 RSA_get0_dmp1(), RSA_get0_dmq1(), and RSA_get0_iqmp(), respectively.
97 RSA_get0_pss_params() is used to retrieve the RSA-PSS parameters.
99 RSA_set_flags() sets the flags in the flags parameter on the RSA
101 object. Multiple flags can be passed in one go (bitwise ORed together).
102 Any flags that are already set are left set. RSA_test_flags() tests to
103 see whether the flags passed in the flags parameter are currently set
104 in the RSA object. Multiple flags can be tested in one go. All flags
105 that are currently set are returned, or zero if none of the flags are
106 set. RSA_clear_flags() clears the specified flags within the RSA
107 object.
108 RSA_get0_engine() returns a handle to the ENGINE that has been set for
110 this RSA object, or NULL if no such ENGINE has been set.
111 RSA_get_version() returns the version of an RSA object r.
113
115 Values retrieved with RSA_get0_key() are owned by the RSA object used
116 in the call and may therefore not be passed to RSA_set0_key(). If
117 needed, duplicate the received value using BN_dup() and pass the
118 duplicate. The same applies to RSA_get0_factors() and
119 RSA_set0_factors() as well as RSA_get0_crt_params() and
120 RSA_set0_crt_params().
121 The caller should obtain the size by calling
123 RSA_get_multi_prime_extra_count() in advance and allocate sufficient
124 buffer to store the return values before calling
125 RSA_get0_multi_prime_factors() and RSA_get0_multi_prime_params().
126 RSA_set0_multi_prime_params() always clears the original multi-prime
128 triplets in RSA object r and assign the new set of triplets into it.
129
131 RSA_set0_key(), RSA_set0_factors(), RSA_set0_crt_params() and
132 RSA_set0_multi_prime_params() return 1 on success or 0 on failure.
133 RSA_get0_n(), RSA_get0_e(), RSA_get0_d(), RSA_get0_p(), RSA_get0_q(),
135 RSA_get0_dmp1(), RSA_get0_dmq1(), and RSA_get0_iqmp() return the
136 respective value.
137 RSA_get0_multi_prime_factors() and RSA_get0_multi_prime_crt_params()
139 return 1 on success or 0 on failure.
140 RSA_get_multi_prime_extra_count() returns two less than the number of
142 primes in use, which is 0 for traditional RSA and the number of extra
143 primes for multi-prime RSA.
144 RSA_get_version() returns RSA_ASN1_VERSION_MULTI for multi-prime RSA
146 and RSA_ASN1_VERSION_DEFAULT for normal two-prime RSA, as defined in
147 RFC 8017.
148 RSA_test_flags() returns the current state of the flags in the RSA
150 object.
151 RSA_get0_engine() returns the ENGINE set for the RSA object or NULL if
153 no ENGINE has been set.
154
156 RSA_new(3), RSA_size(3)
157
159 The RSA_get0_pss_params() function was added in OpenSSL 1.1.1e.
160 The RSA_get_multi_prime_extra_count(), RSA_get0_multi_prime_factors(),
162 RSA_get0_multi_prime_crt_params(), RSA_set0_multi_prime_params(), and
163 RSA_get_version() functions were added in OpenSSL 1.1.1.
164 Other functions described here were added in OpenSSL 1.1.0.
166
168 Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
169 Licensed under the OpenSSL license (the "License"). You may not use
171 this file except in compliance with the License. You can obtain a copy
172 in the file LICENSE in the source distribution or at
173 <https://www.openssl.org/source/license.html>.
1741.1.1q 2023-07-20 RSA_GET0_KEY(3)