crypto/ec/eck_prn.c

   1 /*
   2  * Copyright 2006-2020 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
  21 int 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
  36 int 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
  51 int 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
  67 static int print_bin(BIO *fp, const char *str, const unsigned char *num,
  68                      size_t len, int off);
  69
  70 int 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
 225 static 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 */