1/*
2 * Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
4 *
5 * Licensed under the Apache License 2.0 (the "License").  You may not use
6 * this file except in compliance with the License.  You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
9 */
10
11#include "internal/deprecated.h"
12
13#include <stdio.h>
14#include "internal/cryptlib.h"
15#include <openssl/evp.h>
16#include <openssl/ec.h>
17#include <openssl/bn.h>
18
19#ifndef OPENSSL_NO_DEPRECATED_3_0
20# ifndef OPENSSL_NO_STDIO
21int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off)
22{
23    BIO *b;
24    int ret;
25
26    if ((b = BIO_new(BIO_s_file())) == NULL) {
27        ERR_raise(ERR_LIB_EC, ERR_R_BUF_LIB);
28        return 0;
29    }
30    BIO_set_fp(b, fp, BIO_NOCLOSE);
31    ret = ECPKParameters_print(b, x, off);
32    BIO_free(b);
33    return ret;
34}
35
36int EC_KEY_print_fp(FILE *fp, const EC_KEY *x, int off)
37{
38    BIO *b;
39    int ret;
40
41    if ((b = BIO_new(BIO_s_file())) == NULL) {
42        ERR_raise(ERR_LIB_EC, ERR_R_BIO_LIB);
43        return 0;
44    }
45    BIO_set_fp(b, fp, BIO_NOCLOSE);
46    ret = EC_KEY_print(b, x, off);
47    BIO_free(b);
48    return ret;
49}
50
51int ECParameters_print_fp(FILE *fp, const EC_KEY *x)
52{
53    BIO *b;
54    int ret;
55
56    if ((b = BIO_new(BIO_s_file())) == NULL) {
57        ERR_raise(ERR_LIB_EC, ERR_R_BIO_LIB);
58        return 0;
59    }
60    BIO_set_fp(b, fp, BIO_NOCLOSE);
61    ret = ECParameters_print(b, x);
62    BIO_free(b);
63    return ret;
64}
65#endif /* OPENSSL_NO_STDIO */
66
67static int print_bin(BIO *fp, const char *str, const unsigned char *num,
68                     size_t len, int off);
69
70int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off)
71{
72    int ret = 0, reason = ERR_R_BIO_LIB;
73    BN_CTX *ctx = NULL;
74    const EC_POINT *point = NULL;
75    BIGNUM *p = NULL, *a = NULL, *b = NULL;
76    unsigned char *gen_buf = NULL;
77    const BIGNUM *order = NULL, *cofactor = NULL;
78    const unsigned char *seed;
79    size_t seed_len = 0, gen_buf_len = 0;
80
81    static const char *gen_compressed = "Generator (compressed):";
82    static const char *gen_uncompressed = "Generator (uncompressed):";
83    static const char *gen_hybrid = "Generator (hybrid):";
84
85    if (!x) {
86        reason = ERR_R_PASSED_NULL_PARAMETER;
87        goto err;
88    }
89
90    ctx = BN_CTX_new();
91    if (ctx == NULL) {
92        reason = ERR_R_MALLOC_FAILURE;
93        goto err;
94    }
95
96    if (EC_GROUP_get_asn1_flag(x)) {
97        /* the curve parameter are given by an asn1 OID */
98        int nid;
99        const char *nname;
100
101        if (!BIO_indent(bp, off, 128))
102            goto err;
103
104        nid = EC_GROUP_get_curve_name(x);
105        if (nid == 0)
106            goto err;
107        if (BIO_printf(bp, "ASN1 OID: %s", OBJ_nid2sn(nid)) <= 0)
108            goto err;
109        if (BIO_printf(bp, "\n") <= 0)
110            goto err;
111        nname = EC_curve_nid2nist(nid);
112        if (nname) {
113            if (!BIO_indent(bp, off, 128))
114                goto err;
115            if (BIO_printf(bp, "NIST CURVE: %s\n", nname) <= 0)
116                goto err;
117        }
118    } else {
119        const char *form_str;
120        /* explicit parameters */
121        int is_char_two = 0;
122        point_conversion_form_t form;
123        int tmp_nid = EC_GROUP_get_field_type(x);
124
125        if (tmp_nid == NID_X9_62_characteristic_two_field)
126            is_char_two = 1;
127
128        if ((p = BN_new()) == NULL || (a = BN_new()) == NULL ||
129            (b = BN_new()) == NULL) {
130            reason = ERR_R_MALLOC_FAILURE;
131            goto err;
132        }
133
134        if (!EC_GROUP_get_curve(x, p, a, b, ctx)) {
135            reason = ERR_R_EC_LIB;
136            goto err;
137        }
138
139        if ((point = EC_GROUP_get0_generator(x)) == NULL) {
140            reason = ERR_R_EC_LIB;
141            goto err;
142        }
143        order = EC_GROUP_get0_order(x);
144        cofactor = EC_GROUP_get0_cofactor(x);
145        if (order == NULL) {
146            reason = ERR_R_EC_LIB;
147            goto err;
148        }
149
150        form = EC_GROUP_get_point_conversion_form(x);
151
152        gen_buf_len = EC_POINT_point2buf(x, point, form, &gen_buf, ctx);
153        if (gen_buf_len == 0) {
154            reason = ERR_R_EC_LIB;
155            goto err;
156        }
157
158        if ((seed = EC_GROUP_get0_seed(x)) != NULL)
159            seed_len = EC_GROUP_get_seed_len(x);
160
161        if (!BIO_indent(bp, off, 128))
162            goto err;
163
164        /* print the 'short name' of the field type */
165        if (BIO_printf(bp, "Field Type: %s\n", OBJ_nid2sn(tmp_nid))
166            <= 0)
167            goto err;
168
169        if (is_char_two) {
170            /* print the 'short name' of the base type OID */
171            int basis_type = EC_GROUP_get_basis_type(x);
172            if (basis_type == 0)
173                goto err;
174
175            if (!BIO_indent(bp, off, 128))
176                goto err;
177
178            if (BIO_printf(bp, "Basis Type: %s\n",
179                           OBJ_nid2sn(basis_type)) <= 0)
180                goto err;
181
182            /* print the polynomial */
183            if ((p != NULL) && !ASN1_bn_print(bp, "Polynomial:", p, NULL,
184                                              off))
185                goto err;
186        } else {
187            if ((p != NULL) && !ASN1_bn_print(bp, "Prime:", p, NULL, off))
188                goto err;
189        }
190        if ((a != NULL) && !ASN1_bn_print(bp, "A:   ", a, NULL, off))
191            goto err;
192        if ((b != NULL) && !ASN1_bn_print(bp, "B:   ", b, NULL, off))
193            goto err;
194
195        if (form == POINT_CONVERSION_COMPRESSED)
196            form_str = gen_compressed;
197        else if (form == POINT_CONVERSION_UNCOMPRESSED)
198            form_str = gen_uncompressed;
199        else
200            form_str = gen_hybrid;
201        if (gen_buf != NULL
202            && !print_bin(bp, form_str, gen_buf, gen_buf_len, off))
203            goto err;
204
205        if ((order != NULL) && !ASN1_bn_print(bp, "Order: ", order, NULL, off))
206            goto err;
207        if ((cofactor != NULL) && !ASN1_bn_print(bp, "Cofactor: ", cofactor,
208                                                 NULL, off))
209            goto err;
210        if (seed && !print_bin(bp, "Seed:", seed, seed_len, off))
211            goto err;
212    }
213    ret = 1;
214 err:
215    if (!ret)
216        ERR_raise(ERR_LIB_EC, reason);
217    BN_free(p);
218    BN_free(a);
219    BN_free(b);
220    OPENSSL_clear_free(gen_buf, gen_buf_len);
221    BN_CTX_free(ctx);
222    return ret;
223}
224
225static int print_bin(BIO *fp, const char *name, const unsigned char *buf,
226                     size_t len, int off)
227{
228    size_t i;
229    char str[128 + 1 + 4];
230
231    if (buf == NULL)
232        return 1;
233    if (off > 0) {
234        if (off > 128)
235            off = 128;
236        memset(str, ' ', off);
237        if (BIO_write(fp, str, off) <= 0)
238            return 0;
239    } else {
240        off = 0;
241    }
242
243    if (BIO_printf(fp, "%s", name) <= 0)
244        return 0;
245
246    for (i = 0; i < len; i++) {
247        if ((i % 15) == 0) {
248            str[0] = '\n';
249            memset(&(str[1]), ' ', off + 4);
250            if (BIO_write(fp, str, off + 1 + 4) <= 0)
251                return 0;
252        }
253        if (BIO_printf(fp, "%02x%s", buf[i], ((i + 1) == len) ? "" : ":") <=
254            0)
255            return 0;
256    }
257    if (BIO_write(fp, "\n", 1) <= 0)
258        return 0;
259
260    return 1;
261}
262#endif /* OPENSSL_NO_DEPRECATED_3_0 */
263