1/*
2 * Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <string.h>
11#include <openssl/ec.h>
12#include "crypto/ec.h"
13#include "internal/nelem.h"
14
15typedef struct ec_name2nid_st {
16    const char *name;
17    int nid;
18} EC_NAME2NID;
19
20static const EC_NAME2NID curve_list[] = {
21    /* prime field curves */
22    /* secg curves */
23    {"secp112r1", NID_secp112r1 },
24    {"secp112r2", NID_secp112r2 },
25    {"secp128r1", NID_secp128r1 },
26    {"secp128r2", NID_secp128r2 },
27    {"secp160k1", NID_secp160k1 },
28    {"secp160r1", NID_secp160r1 },
29    {"secp160r2", NID_secp160r2 },
30    {"secp192k1", NID_secp192k1 },
31    {"secp224k1", NID_secp224k1 },
32    {"secp224r1", NID_secp224r1 },
33    {"secp256k1", NID_secp256k1 },
34    {"secp384r1", NID_secp384r1 },
35    {"secp521r1", NID_secp521r1 },
36    /* X9.62 curves */
37    {"prime192v1", NID_X9_62_prime192v1 },
38    {"prime192v2", NID_X9_62_prime192v2 },
39    {"prime192v3", NID_X9_62_prime192v3 },
40    {"prime239v1", NID_X9_62_prime239v1 },
41    {"prime239v2", NID_X9_62_prime239v2 },
42    {"prime239v3", NID_X9_62_prime239v3 },
43    {"prime256v1", NID_X9_62_prime256v1 },
44    /* characteristic two field curves */
45    /* NIST/SECG curves */
46    {"sect113r1", NID_sect113r1 },
47    {"sect113r2", NID_sect113r2 },
48    {"sect131r1", NID_sect131r1 },
49    {"sect131r2", NID_sect131r2 },
50    {"sect163k1", NID_sect163k1 },
51    {"sect163r1", NID_sect163r1 },
52    {"sect163r2", NID_sect163r2 },
53    {"sect193r1", NID_sect193r1 },
54    {"sect193r2", NID_sect193r2 },
55    {"sect233k1", NID_sect233k1 },
56    {"sect233r1", NID_sect233r1 },
57    {"sect239k1", NID_sect239k1 },
58    {"sect283k1", NID_sect283k1 },
59    {"sect283r1", NID_sect283r1 },
60    {"sect409k1", NID_sect409k1 },
61    {"sect409r1", NID_sect409r1 },
62    {"sect571k1", NID_sect571k1 },
63    {"sect571r1", NID_sect571r1 },
64    /* X9.62 curves */
65    {"c2pnb163v1", NID_X9_62_c2pnb163v1 },
66    {"c2pnb163v2", NID_X9_62_c2pnb163v2 },
67    {"c2pnb163v3", NID_X9_62_c2pnb163v3 },
68    {"c2pnb176v1", NID_X9_62_c2pnb176v1 },
69    {"c2tnb191v1", NID_X9_62_c2tnb191v1 },
70    {"c2tnb191v2", NID_X9_62_c2tnb191v2 },
71    {"c2tnb191v3", NID_X9_62_c2tnb191v3 },
72    {"c2pnb208w1", NID_X9_62_c2pnb208w1 },
73    {"c2tnb239v1", NID_X9_62_c2tnb239v1 },
74    {"c2tnb239v2", NID_X9_62_c2tnb239v2 },
75    {"c2tnb239v3", NID_X9_62_c2tnb239v3 },
76    {"c2pnb272w1", NID_X9_62_c2pnb272w1 },
77    {"c2pnb304w1", NID_X9_62_c2pnb304w1 },
78    {"c2tnb359v1", NID_X9_62_c2tnb359v1 },
79    {"c2pnb368w1", NID_X9_62_c2pnb368w1 },
80    {"c2tnb431r1", NID_X9_62_c2tnb431r1 },
81    /*
82     * the WAP/WTLS curves [unlike SECG, spec has its own OIDs for curves
83     * from X9.62]
84     */
85    {"wap-wsg-idm-ecid-wtls1", NID_wap_wsg_idm_ecid_wtls1 },
86    {"wap-wsg-idm-ecid-wtls3", NID_wap_wsg_idm_ecid_wtls3 },
87    {"wap-wsg-idm-ecid-wtls4", NID_wap_wsg_idm_ecid_wtls4 },
88    {"wap-wsg-idm-ecid-wtls5", NID_wap_wsg_idm_ecid_wtls5 },
89    {"wap-wsg-idm-ecid-wtls6", NID_wap_wsg_idm_ecid_wtls6 },
90    {"wap-wsg-idm-ecid-wtls7", NID_wap_wsg_idm_ecid_wtls7 },
91    {"wap-wsg-idm-ecid-wtls8", NID_wap_wsg_idm_ecid_wtls8 },
92    {"wap-wsg-idm-ecid-wtls9", NID_wap_wsg_idm_ecid_wtls9 },
93    {"wap-wsg-idm-ecid-wtls10", NID_wap_wsg_idm_ecid_wtls10 },
94    {"wap-wsg-idm-ecid-wtls11", NID_wap_wsg_idm_ecid_wtls11 },
95    {"wap-wsg-idm-ecid-wtls12", NID_wap_wsg_idm_ecid_wtls12 },
96    /* IPSec curves */
97    {"Oakley-EC2N-3", NID_ipsec3 },
98    {"Oakley-EC2N-4", NID_ipsec4 },
99    /* brainpool curves */
100    {"brainpoolP160r1", NID_brainpoolP160r1 },
101    {"brainpoolP160t1", NID_brainpoolP160t1 },
102    {"brainpoolP192r1", NID_brainpoolP192r1 },
103    {"brainpoolP192t1", NID_brainpoolP192t1 },
104    {"brainpoolP224r1", NID_brainpoolP224r1 },
105    {"brainpoolP224t1", NID_brainpoolP224t1 },
106    {"brainpoolP256r1", NID_brainpoolP256r1 },
107    {"brainpoolP256t1", NID_brainpoolP256t1 },
108    {"brainpoolP320r1", NID_brainpoolP320r1 },
109    {"brainpoolP320t1", NID_brainpoolP320t1 },
110    {"brainpoolP384r1", NID_brainpoolP384r1 },
111    {"brainpoolP384t1", NID_brainpoolP384t1 },
112    {"brainpoolP512r1", NID_brainpoolP512r1 },
113    {"brainpoolP512t1", NID_brainpoolP512t1 },
114    /* SM2 curve */
115    {"SM2", NID_sm2 },
116};
117
118const char *OSSL_EC_curve_nid2name(int nid)
119{
120    size_t i;
121
122    if (nid <= 0)
123        return NULL;
124
125    for (i = 0; i < OSSL_NELEM(curve_list); i++) {
126        if (curve_list[i].nid == nid)
127            return curve_list[i].name;
128    }
129    return NULL;
130}
131
132int ossl_ec_curve_name2nid(const char *name)
133{
134    size_t i;
135    int nid;
136
137    if (name != NULL) {
138        if ((nid = ossl_ec_curve_nist2nid_int(name)) != NID_undef)
139            return nid;
140
141        for (i = 0; i < OSSL_NELEM(curve_list); i++) {
142            if (OPENSSL_strcasecmp(curve_list[i].name, name) == 0)
143                return curve_list[i].nid;
144        }
145    }
146
147    return NID_undef;
148}
149
150/* Functions to translate between common NIST curve names and NIDs */
151
152static const EC_NAME2NID nist_curves[] = {
153    {"B-163", NID_sect163r2},
154    {"B-233", NID_sect233r1},
155    {"B-283", NID_sect283r1},
156    {"B-409", NID_sect409r1},
157    {"B-571", NID_sect571r1},
158    {"K-163", NID_sect163k1},
159    {"K-233", NID_sect233k1},
160    {"K-283", NID_sect283k1},
161    {"K-409", NID_sect409k1},
162    {"K-571", NID_sect571k1},
163    {"P-192", NID_X9_62_prime192v1},
164    {"P-224", NID_secp224r1},
165    {"P-256", NID_X9_62_prime256v1},
166    {"P-384", NID_secp384r1},
167    {"P-521", NID_secp521r1}
168};
169
170const char *ossl_ec_curve_nid2nist_int(int nid)
171{
172    size_t i;
173    for (i = 0; i < OSSL_NELEM(nist_curves); i++) {
174        if (nist_curves[i].nid == nid)
175            return nist_curves[i].name;
176    }
177    return NULL;
178}
179
180int ossl_ec_curve_nist2nid_int(const char *name)
181{
182    size_t i;
183    for (i = 0; i < OSSL_NELEM(nist_curves); i++) {
184        if (strcmp(nist_curves[i].name, name) == 0)
185            return nist_curves[i].nid;
186    }
187    return NID_undef;
188}
189