crypto/ec/ec_print.c

   1 /* crypto/ec/ec_print.c */
   2 /* ====================================================================
   3  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    openssl-core@openssl.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  * This product includes cryptographic software written by Eric Young
  51  * (eay@cryptsoft.com).  This product includes software written by Tim
  52  * Hudson (tjh@cryptsoft.com).
  53  *
  54  */
  55
  56 #include <openssl/crypto.h>
  57 #include "ec_lcl.h"
  58
  59 BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
  60                           const EC_POINT *point,
  61                           point_conversion_form_t form,
  62                           BIGNUM *ret,
  63                           BN_CTX *ctx)
  64         {
  65         size_t        buf_len=0;
  66         unsigned char *buf;
  67
  68         buf_len = EC_POINT_point2oct(group, point, form,
  69                                      NULL, 0, ctx);
  70         if (buf_len == 0)
  71                 return NULL;
  72
  73         if ((buf = OPENSSL_malloc(buf_len)) == NULL)
  74                 return NULL;
  75
  76         if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx))
  77                 {
  78                 OPENSSL_free(buf);
  79                 return NULL;
  80                 }
  81
  82         ret = BN_bin2bn(buf, buf_len, ret);
  83
  84         OPENSSL_free(buf);
  85
  86         return ret;
  87 }
  88
  89 EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
  90                             const BIGNUM *bn,
  91                             EC_POINT *point,
  92                             BN_CTX *ctx)
  93         {
  94         size_t        buf_len=0;
  95         unsigned char *buf;
  96         EC_POINT      *ret;
  97
  98         if ((buf_len = BN_num_bytes(bn)) == 0) return NULL;
  99         buf = OPENSSL_malloc(buf_len);
 100         if (buf == NULL)
 101                 return NULL;
 102
 103         if (!BN_bn2bin(bn, buf))
 104                 {
 105                 OPENSSL_free(buf);
 106                 return NULL;
 107                 }
 108
 109         if (point == NULL)
 110                 {
 111                 if ((ret = EC_POINT_new(group)) == NULL)
 112                         {
 113                         OPENSSL_free(buf);
 114                         return NULL;
 115                         }
 116                 }
 117         else
 118                 ret = point;
 119
 120         if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx))
 121                 {
 122                 if (point == NULL)
 123                         EC_POINT_clear_free(ret);
 124                 OPENSSL_free(buf);
 125                 return NULL;
 126                 }
 127
 128         OPENSSL_free(buf);
 129         return ret;
 130         }
 131
 132 static const char *HEX_DIGITS = "0123456789ABCDEF";
 133
 134 /* the return value must be freed (using OPENSSL_free()) */
 135 char *EC_POINT_point2hex(const EC_GROUP *group,
 136                          const EC_POINT *point,
 137                          point_conversion_form_t form,
 138                          BN_CTX *ctx)
 139         {
 140         char          *ret, *p;
 141         size_t        buf_len=0,i;
 142         unsigned char *buf, *pbuf;
 143
 144         buf_len = EC_POINT_point2oct(group, point, form,
 145                                      NULL, 0, ctx);
 146         if (buf_len == 0)
 147                 return NULL;
 148
 149         if ((buf = OPENSSL_malloc(buf_len)) == NULL)
 150                 return NULL;
 151
 152         if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx))
 153                 {
 154                 OPENSSL_free(buf);
 155                 return NULL;
 156                 }
 157
 158         ret = (char *)OPENSSL_malloc(buf_len*2+2);
 159         if (ret == NULL)
 160                 {
 161                 OPENSSL_free(buf);
 162                 return NULL;
 163                 }
 164         p = ret;
 165         pbuf = buf;
 166         for (i=buf_len; i > 0; i--)
 167                 {
 168                         int v = (int) *(pbuf++);
 169                         *(p++)=HEX_DIGITS[v>>4];
 170                         *(p++)=HEX_DIGITS[v&0x0F];
 171                 }
 172         *p='\0';
 173
 174         OPENSSL_free(buf);
 175
 176         return ret;
 177         }
 178
 179 EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
 180                              const char *buf,
 181                              EC_POINT *point,
 182                              BN_CTX *ctx)
 183         {
 184         EC_POINT *ret=NULL;
 185         BIGNUM   *tmp_bn=NULL;
 186
 187         if (!BN_hex2bn(&tmp_bn, buf))
 188                 return NULL;
 189
 190         ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
 191
 192         BN_clear_free(tmp_bn);
 193
 194         return ret;
 195         }