1/*
2 * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
4 *
5 * Licensed under the OpenSSL license (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 <stdio.h>
12#include "internal/cryptlib.h"
13#include <openssl/evp.h>
14#include <openssl/ec.h>
15#include <openssl/bn.h>
16
17#ifndef OPENSSL_NO_STDIO
18int ECPKParameters_print_fp(FILE *fp, const EC_GROUP *x, int off)
19{
20    BIO *b;
21    int ret;
22
23    if ((b = BIO_new(BIO_s_file())) == NULL) {
24        ECerr(EC_F_ECPKPARAMETERS_PRINT_FP, ERR_R_BUF_LIB);
25        return 0;
26    }
27    BIO_set_fp(b, fp, BIO_NOCLOSE);
28    ret = ECPKParameters_print(b, x, off);
29    BIO_free(b);
30    return ret;
31}
32
33int EC_KEY_print_fp(FILE *fp, const EC_KEY *x, int off)
34{
35    BIO *b;
36    int ret;
37
38    if ((b = BIO_new(BIO_s_file())) == NULL) {
39        ECerr(EC_F_EC_KEY_PRINT_FP, ERR_R_BIO_LIB);
40        return 0;
41    }
42    BIO_set_fp(b, fp, BIO_NOCLOSE);
43    ret = EC_KEY_print(b, x, off);
44    BIO_free(b);
45    return ret;
46}
47
48int ECParameters_print_fp(FILE *fp, const EC_KEY *x)
49{
50    BIO *b;
51    int ret;
52
53    if ((b = BIO_new(BIO_s_file())) == NULL) {
54        ECerr(EC_F_ECPARAMETERS_PRINT_FP, ERR_R_BIO_LIB);
55        return 0;
56    }
57    BIO_set_fp(b, fp, BIO_NOCLOSE);
58    ret = ECParameters_print(b, x);
59    BIO_free(b);
60    return ret;
61}
62#endif
63
64static int print_bin(BIO *fp, const char *str, const unsigned char *num,
65                     size_t len, int off);
66
67int ECPKParameters_print(BIO *bp, const EC_GROUP *x, int off)
68{
69    int ret = 0, reason = ERR_R_BIO_LIB;
70    BN_CTX *ctx = NULL;
71    const EC_POINT *point = NULL;
72    BIGNUM *p = NULL, *a = NULL, *b = NULL, *gen = NULL;
73    const BIGNUM *order = NULL, *cofactor = NULL;
74    const unsigned char *seed;
75    size_t seed_len = 0;
76
77    static const char *gen_compressed = "Generator (compressed):";
78    static const char *gen_uncompressed = "Generator (uncompressed):";
79    static const char *gen_hybrid = "Generator (hybrid):";
80
81    if (!x) {
82        reason = ERR_R_PASSED_NULL_PARAMETER;
83        goto err;
84    }
85
86    ctx = BN_CTX_new();
87    if (ctx == NULL) {
88        reason = ERR_R_MALLOC_FAILURE;
89        goto err;
90    }
91
92    if (EC_GROUP_get_asn1_flag(x)) {
93        /* the curve parameter are given by an asn1 OID */
94        int nid;
95        const char *nname;
96
97        if (!BIO_indent(bp, off, 128))
98            goto err;
99
100        nid = EC_GROUP_get_curve_name(x);
101        if (nid == 0)
102            goto err;
103        if (BIO_printf(bp, "ASN1 OID: %s", OBJ_nid2sn(nid)) <= 0)
104            goto err;
105        if (BIO_printf(bp, "\n") <= 0)
106            goto err;
107        nname = EC_curve_nid2nist(nid);
108        if (nname) {
109            if (!BIO_indent(bp, off, 128))
110                goto err;
111            if (BIO_printf(bp, "NIST CURVE: %s\n", nname) <= 0)
112                goto err;
113        }
114    } else {
115        /* explicit parameters */
116        int is_char_two = 0;
117        point_conversion_form_t form;
118        int tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(x));
119
120        if (tmp_nid == NID_X9_62_characteristic_two_field)
121            is_char_two = 1;
122
123        if ((p = BN_new()) == NULL || (a = BN_new()) == NULL ||
124            (b = BN_new()) == NULL) {
125            reason = ERR_R_MALLOC_FAILURE;
126            goto err;
127        }
128
129        if (!EC_GROUP_get_curve(x, p, a, b, ctx)) {
130            reason = ERR_R_EC_LIB;
131            goto err;
132        }
133
134        if ((point = EC_GROUP_get0_generator(x)) == NULL) {
135            reason = ERR_R_EC_LIB;
136            goto err;
137        }
138        order = EC_GROUP_get0_order(x);
139        cofactor = EC_GROUP_get0_cofactor(x);
140        if (order == NULL) {
141            reason = ERR_R_EC_LIB;
142            goto err;
143        }
144
145        form = EC_GROUP_get_point_conversion_form(x);
146
147        if ((gen = EC_POINT_point2bn(x, point, form, NULL, ctx)) == NULL) {
148            reason = ERR_R_EC_LIB;
149            goto err;
150        }
151
152        if ((seed = EC_GROUP_get0_seed(x)) != NULL)
153            seed_len = EC_GROUP_get_seed_len(x);
154
155        if (!BIO_indent(bp, off, 128))
156            goto err;
157
158        /* print the 'short name' of the field type */
159        if (BIO_printf(bp, "Field Type: %s\n", OBJ_nid2sn(tmp_nid))
160            <= 0)
161            goto err;
162
163        if (is_char_two) {
164            /* print the 'short name' of the base type OID */
165            int basis_type = EC_GROUP_get_basis_type(x);
166            if (basis_type == 0)
167                goto err;
168
169            if (!BIO_indent(bp, off, 128))
170                goto err;
171
172            if (BIO_printf(bp, "Basis Type: %s\n",
173                           OBJ_nid2sn(basis_type)) <= 0)
174                goto err;
175
176            /* print the polynomial */
177            if ((p != NULL) && !ASN1_bn_print(bp, "Polynomial:", p, NULL,
178                                              off))
179                goto err;
180        } else {
181            if ((p != NULL) && !ASN1_bn_print(bp, "Prime:", p, NULL, off))
182                goto err;
183        }
184        if ((a != NULL) && !ASN1_bn_print(bp, "A:   ", a, NULL, off))
185            goto err;
186        if ((b != NULL) && !ASN1_bn_print(bp, "B:   ", b, NULL, off))
187            goto err;
188        if (form == POINT_CONVERSION_COMPRESSED) {
189            if ((gen != NULL) && !ASN1_bn_print(bp, gen_compressed, gen,
190                                                NULL, off))
191                goto err;
192        } else if (form == POINT_CONVERSION_UNCOMPRESSED) {
193            if ((gen != NULL) && !ASN1_bn_print(bp, gen_uncompressed, gen,
194                                                NULL, off))
195                goto err;
196        } else {                /* form == POINT_CONVERSION_HYBRID */
197
198            if ((gen != NULL) && !ASN1_bn_print(bp, gen_hybrid, gen,
199                                                NULL, off))
200                goto err;
201        }
202        if ((order != NULL) && !ASN1_bn_print(bp, "Order: ", order,
203                                              NULL, off))
204            goto err;
205        if ((cofactor != NULL) && !ASN1_bn_print(bp, "Cofactor: ", cofactor,
206                                                 NULL, off))
207            goto err;
208        if (seed && !print_bin(bp, "Seed:", seed, seed_len, off))
209            goto err;
210    }
211    ret = 1;
212 err:
213    if (!ret)
214        ECerr(EC_F_ECPKPARAMETERS_PRINT, reason);
215    BN_free(p);
216    BN_free(a);
217    BN_free(b);
218    BN_free(gen);
219    BN_CTX_free(ctx);
220    return ret;
221}
222
223static int print_bin(BIO *fp, const char *name, const unsigned char *buf,
224                     size_t len, int off)
225{
226    size_t i;
227    char str[128 + 1 + 4];
228
229    if (buf == NULL)
230        return 1;
231    if (off > 0) {
232        if (off > 128)
233            off = 128;
234        memset(str, ' ', off);
235        if (BIO_write(fp, str, off) <= 0)
236            return 0;
237    } else {
238        off = 0;
239    }
240
241    if (BIO_printf(fp, "%s", name) <= 0)
242        return 0;
243
244    for (i = 0; i < len; i++) {
245        if ((i % 15) == 0) {
246            str[0] = '\n';
247            memset(&(str[1]), ' ', off + 4);
248            if (BIO_write(fp, str, off + 1 + 4) <= 0)
249                return 0;
250        }
251        if (BIO_printf(fp, "%02x%s", buf[i], ((i + 1) == len) ? "" : ":") <=
252            0)
253            return 0;
254    }
255    if (BIO_write(fp, "\n", 1) <= 0)
256        return 0;
257
258    return 1;
259}
260