ec_print.c 5.4 KB

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  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. #include <openssl/crypto.h>
  56. #include "ec_lcl.h"
  57. BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
  58. const EC_POINT *point,
  59. point_conversion_form_t form,
  60. BIGNUM *ret,
  61. BN_CTX *ctx)
  62. {
  63. size_t buf_len=0;
  64. unsigned char *buf;
  65. buf_len = EC_POINT_point2oct(group, point, form,
  66. NULL, 0, ctx);
  67. if (buf_len == 0)
  68. return NULL;
  69. if ((buf = OPENSSL_malloc(buf_len)) == NULL)
  70. return NULL;
  71. if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx))
  72. {
  73. OPENSSL_free(buf);
  74. return NULL;
  75. }
  76. ret = BN_bin2bn(buf, buf_len, ret);
  77. OPENSSL_free(buf);
  78. return ret;
  79. }
  80. EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
  81. const BIGNUM *bn,
  82. EC_POINT *point,
  83. BN_CTX *ctx)
  84. {
  85. size_t buf_len=0;
  86. unsigned char *buf;
  87. EC_POINT *ret;
  88. if ((buf_len = BN_num_bytes(bn)) == 0) return NULL;
  89. buf = OPENSSL_malloc(buf_len);
  90. if (buf == NULL)
  91. return NULL;
  92. if (!BN_bn2bin(bn, buf))
  93. {
  94. OPENSSL_free(buf);
  95. return NULL;
  96. }
  97. if (point == NULL)
  98. {
  99. if ((ret = EC_POINT_new(group)) == NULL)
  100. {
  101. OPENSSL_free(buf);
  102. return NULL;
  103. }
  104. }
  105. else
  106. ret = point;
  107. if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx))
  108. {
  109. if (point == NULL)
  110. EC_POINT_clear_free(ret);
  111. OPENSSL_free(buf);
  112. return NULL;
  113. }
  114. OPENSSL_free(buf);
  115. return ret;
  116. }
  117. static const char *HEX_DIGITS = "0123456789ABCDEF";
  118. /* the return value must be freed (using OPENSSL_free()) */
  119. char *EC_POINT_point2hex(const EC_GROUP *group,
  120. const EC_POINT *point,
  121. point_conversion_form_t form,
  122. BN_CTX *ctx)
  123. {
  124. char *ret, *p;
  125. size_t buf_len=0,i;
  126. unsigned char *buf, *pbuf;
  127. buf_len = EC_POINT_point2oct(group, point, form,
  128. NULL, 0, ctx);
  129. if (buf_len == 0)
  130. return NULL;
  131. if ((buf = OPENSSL_malloc(buf_len)) == NULL)
  132. return NULL;
  133. if (!EC_POINT_point2oct(group, point, form, buf, buf_len, ctx))
  134. {
  135. OPENSSL_free(buf);
  136. return NULL;
  137. }
  138. ret = (char *)OPENSSL_malloc(buf_len*2+2);
  139. if (ret == NULL)
  140. {
  141. OPENSSL_free(buf);
  142. return NULL;
  143. }
  144. p = ret;
  145. pbuf = buf;
  146. for (i=buf_len; i > 0; i--)
  147. {
  148. int v = (int) *(pbuf++);
  149. *(p++)=HEX_DIGITS[v>>4];
  150. *(p++)=HEX_DIGITS[v&0x0F];
  151. }
  152. *p='\0';
  153. OPENSSL_free(buf);
  154. return ret;
  155. }
  156. EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
  157. const char *buf,
  158. EC_POINT *point,
  159. BN_CTX *ctx)
  160. {
  161. EC_POINT *ret=NULL;
  162. BIGNUM *tmp_bn=NULL;
  163. if (!BN_hex2bn(&tmp_bn, buf))
  164. return NULL;
  165. ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
  166. BN_clear_free(tmp_bn);
  167. return ret;
  168. }