a_enum.c 6.0 KB

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  1. /* crypto/asn1/a_enum.c */
  2. /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  3. * All rights reserved.
  4. *
  5. * This package is an SSL implementation written
  6. * by Eric Young (eay@cryptsoft.com).
  7. * The implementation was written so as to conform with Netscapes SSL.
  8. *
  9. * This library is free for commercial and non-commercial use as long as
  10. * the following conditions are aheared to. The following conditions
  11. * apply to all code found in this distribution, be it the RC4, RSA,
  12. * lhash, DES, etc., code; not just the SSL code. The SSL documentation
  13. * included with this distribution is covered by the same copyright terms
  14. * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15. *
  16. * Copyright remains Eric Young's, and as such any Copyright notices in
  17. * the code are not to be removed.
  18. * If this package is used in a product, Eric Young should be given attribution
  19. * as the author of the parts of the library used.
  20. * This can be in the form of a textual message at program startup or
  21. * in documentation (online or textual) provided with the package.
  22. *
  23. * Redistribution and use in source and binary forms, with or without
  24. * modification, are permitted provided that the following conditions
  25. * are met:
  26. * 1. Redistributions of source code must retain the copyright
  27. * notice, this list of conditions and the following disclaimer.
  28. * 2. Redistributions in binary form must reproduce the above copyright
  29. * notice, this list of conditions and the following disclaimer in the
  30. * documentation and/or other materials provided with the distribution.
  31. * 3. All advertising materials mentioning features or use of this software
  32. * must display the following acknowledgement:
  33. * "This product includes cryptographic software written by
  34. * Eric Young (eay@cryptsoft.com)"
  35. * The word 'cryptographic' can be left out if the rouines from the library
  36. * being used are not cryptographic related :-).
  37. * 4. If you include any Windows specific code (or a derivative thereof) from
  38. * the apps directory (application code) you must include an acknowledgement:
  39. * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40. *
  41. * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44. * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51. * SUCH DAMAGE.
  52. *
  53. * The licence and distribution terms for any publically available version or
  54. * derivative of this code cannot be changed. i.e. this code cannot simply be
  55. * copied and put under another distribution licence
  56. * [including the GNU Public Licence.]
  57. */
  58. #include <stdio.h>
  59. #include "cryptlib.h"
  60. #include <openssl/asn1.h>
  61. #include <openssl/bn.h>
  62. /*
  63. * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
  64. * for comments on encoding see a_int.c
  65. */
  66. int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
  67. {
  68. int j, k;
  69. unsigned int i;
  70. unsigned char buf[sizeof(long) + 1];
  71. long d;
  72. a->type = V_ASN1_ENUMERATED;
  73. if (a->length < (int)(sizeof(long) + 1)) {
  74. if (a->data != NULL)
  75. OPENSSL_free(a->data);
  76. if ((a->data =
  77. (unsigned char *)OPENSSL_malloc(sizeof(long) + 1)) != NULL)
  78. memset((char *)a->data, 0, sizeof(long) + 1);
  79. }
  80. if (a->data == NULL) {
  81. ASN1err(ASN1_F_ASN1_ENUMERATED_SET, ERR_R_MALLOC_FAILURE);
  82. return (0);
  83. }
  84. d = v;
  85. if (d < 0) {
  86. d = -d;
  87. a->type = V_ASN1_NEG_ENUMERATED;
  88. }
  89. for (i = 0; i < sizeof(long); i++) {
  90. if (d == 0)
  91. break;
  92. buf[i] = (int)d & 0xff;
  93. d >>= 8;
  94. }
  95. j = 0;
  96. for (k = i - 1; k >= 0; k--)
  97. a->data[j++] = buf[k];
  98. a->length = j;
  99. return (1);
  100. }
  101. long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
  102. {
  103. int neg = 0, i;
  104. long r = 0;
  105. if (a == NULL)
  106. return (0L);
  107. i = a->type;
  108. if (i == V_ASN1_NEG_ENUMERATED)
  109. neg = 1;
  110. else if (i != V_ASN1_ENUMERATED)
  111. return -1;
  112. if (a->length > (int)sizeof(long)) {
  113. /* hmm... a bit ugly */
  114. return (0xffffffffL);
  115. }
  116. if (a->data == NULL)
  117. return 0;
  118. for (i = 0; i < a->length; i++) {
  119. r <<= 8;
  120. r |= (unsigned char)a->data[i];
  121. }
  122. if (neg)
  123. r = -r;
  124. return (r);
  125. }
  126. ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
  127. {
  128. ASN1_ENUMERATED *ret;
  129. int len, j;
  130. if (ai == NULL)
  131. ret = M_ASN1_ENUMERATED_new();
  132. else
  133. ret = ai;
  134. if (ret == NULL) {
  135. ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_NESTED_ASN1_ERROR);
  136. goto err;
  137. }
  138. if (BN_is_negative(bn))
  139. ret->type = V_ASN1_NEG_ENUMERATED;
  140. else
  141. ret->type = V_ASN1_ENUMERATED;
  142. j = BN_num_bits(bn);
  143. len = ((j == 0) ? 0 : ((j / 8) + 1));
  144. if (ret->length < len + 4) {
  145. unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4);
  146. if (!new_data) {
  147. ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
  148. goto err;
  149. }
  150. ret->data = new_data;
  151. }
  152. ret->length = BN_bn2bin(bn, ret->data);
  153. return (ret);
  154. err:
  155. if (ret != ai)
  156. M_ASN1_ENUMERATED_free(ret);
  157. return (NULL);
  158. }
  159. BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
  160. {
  161. BIGNUM *ret;
  162. if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
  163. ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN, ASN1_R_BN_LIB);
  164. else if (ai->type == V_ASN1_NEG_ENUMERATED)
  165. BN_set_negative(ret, 1);
  166. return (ret);
  167. }