crypto/ec/eck_prn.c

   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 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 <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
  18 int 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
  33 int 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
  48 int 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
  64 static int print_bin(BIO *fp, const char *str, const unsigned char *num,
  65                      size_t len, int off);
  66
  67 int 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
 223 static 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 }