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p5_pbev2.c 7.8 KB

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  1. /* p5_pbev2.c */
  2. /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  3. * project 1999-2004.
  4. */
  5. /* ====================================================================
  6. * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
  7. *
  8. * Redistribution and use in source and binary forms, with or without
  9. * modification, are permitted provided that the following conditions
  10. * are met:
  11. *
  12. * 1. Redistributions of source code must retain the above copyright
  13. * notice, this list of conditions and the following disclaimer.
  14. *
  15. * 2. Redistributions in binary form must reproduce the above copyright
  16. * notice, this list of conditions and the following disclaimer in
  17. * the documentation and/or other materials provided with the
  18. * distribution.
  19. *
  20. * 3. All advertising materials mentioning features or use of this
  21. * software must display the following acknowledgment:
  22. * "This product includes software developed by the OpenSSL Project
  23. * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24. *
  25. * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26. * endorse or promote products derived from this software without
  27. * prior written permission. For written permission, please contact
  28. * licensing@OpenSSL.org.
  29. *
  30. * 5. Products derived from this software may not be called "OpenSSL"
  31. * nor may "OpenSSL" appear in their names without prior written
  32. * permission of the OpenSSL Project.
  33. *
  34. * 6. Redistributions of any form whatsoever must retain the following
  35. * acknowledgment:
  36. * "This product includes software developed by the OpenSSL Project
  37. * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38. *
  39. * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40. * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42. * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45. * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48. * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49. * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50. * OF THE POSSIBILITY OF SUCH DAMAGE.
  51. * ====================================================================
  52. *
  53. * This product includes cryptographic software written by Eric Young
  54. * (eay@cryptsoft.com). This product includes software written by Tim
  55. * Hudson (tjh@cryptsoft.com).
  56. *
  57. */
  58. #include <stdio.h>
  59. #include "cryptlib.h"
  60. #include <openssl/asn1t.h>
  61. #include <openssl/x509.h>
  62. #include <openssl/rand.h>
  63. /* PKCS#5 v2.0 password based encryption structures */
  64. ASN1_SEQUENCE(PBE2PARAM) = {
  65. ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
  66. ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
  67. } ASN1_SEQUENCE_END(PBE2PARAM)
  68. IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
  69. ASN1_SEQUENCE(PBKDF2PARAM) = {
  70. ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
  71. ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
  72. ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
  73. ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
  74. } ASN1_SEQUENCE_END(PBKDF2PARAM)
  75. IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
  76. /* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm:
  77. * yes I know this is horrible!
  78. *
  79. * Extended version to allow application supplied PRF NID and IV.
  80. */
  81. X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
  82. unsigned char *salt, int saltlen,
  83. unsigned char *aiv, int prf_nid)
  84. {
  85. X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
  86. int alg_nid, keylen;
  87. EVP_CIPHER_CTX ctx;
  88. unsigned char iv[EVP_MAX_IV_LENGTH];
  89. PBE2PARAM *pbe2 = NULL;
  90. ASN1_OBJECT *obj;
  91. alg_nid = EVP_CIPHER_type(cipher);
  92. if(alg_nid == NID_undef) {
  93. ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
  94. ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
  95. goto err;
  96. }
  97. obj = OBJ_nid2obj(alg_nid);
  98. if(!(pbe2 = PBE2PARAM_new())) goto merr;
  99. /* Setup the AlgorithmIdentifier for the encryption scheme */
  100. scheme = pbe2->encryption;
  101. scheme->algorithm = obj;
  102. if(!(scheme->parameter = ASN1_TYPE_new())) goto merr;
  103. /* Create random IV */
  104. if (EVP_CIPHER_iv_length(cipher))
  105. {
  106. if (aiv)
  107. memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
  108. else if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
  109. goto err;
  110. }
  111. EVP_CIPHER_CTX_init(&ctx);
  112. /* Dummy cipherinit to just setup the IV, and PRF */
  113. if (!EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0))
  114. goto err;
  115. if(EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) {
  116. ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
  117. ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
  118. EVP_CIPHER_CTX_cleanup(&ctx);
  119. goto err;
  120. }
  121. /* If prf NID unspecified see if cipher has a preference.
  122. * An error is OK here: just means use default PRF.
  123. */
  124. if ((prf_nid == -1) &&
  125. EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0)
  126. {
  127. ERR_clear_error();
  128. prf_nid = NID_hmacWithSHA1;
  129. }
  130. EVP_CIPHER_CTX_cleanup(&ctx);
  131. /* If its RC2 then we'd better setup the key length */
  132. if(alg_nid == NID_rc2_cbc)
  133. keylen = EVP_CIPHER_key_length(cipher);
  134. else
  135. keylen = -1;
  136. /* Setup keyfunc */
  137. X509_ALGOR_free(pbe2->keyfunc);
  138. pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);
  139. if (!pbe2->keyfunc)
  140. goto merr;
  141. /* Now set up top level AlgorithmIdentifier */
  142. if(!(ret = X509_ALGOR_new())) goto merr;
  143. if(!(ret->parameter = ASN1_TYPE_new())) goto merr;
  144. ret->algorithm = OBJ_nid2obj(NID_pbes2);
  145. /* Encode PBE2PARAM into parameter */
  146. if(!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM),
  147. &ret->parameter->value.sequence)) goto merr;
  148. ret->parameter->type = V_ASN1_SEQUENCE;
  149. PBE2PARAM_free(pbe2);
  150. pbe2 = NULL;
  151. return ret;
  152. merr:
  153. ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,ERR_R_MALLOC_FAILURE);
  154. err:
  155. PBE2PARAM_free(pbe2);
  156. /* Note 'scheme' is freed as part of pbe2 */
  157. X509_ALGOR_free(kalg);
  158. X509_ALGOR_free(ret);
  159. return NULL;
  160. }
  161. X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
  162. unsigned char *salt, int saltlen)
  163. {
  164. return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1);
  165. }
  166. X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
  167. int prf_nid, int keylen)
  168. {
  169. X509_ALGOR *keyfunc = NULL;
  170. PBKDF2PARAM *kdf = NULL;
  171. ASN1_OCTET_STRING *osalt = NULL;
  172. if(!(kdf = PBKDF2PARAM_new()))
  173. goto merr;
  174. if(!(osalt = M_ASN1_OCTET_STRING_new()))
  175. goto merr;
  176. kdf->salt->value.octet_string = osalt;
  177. kdf->salt->type = V_ASN1_OCTET_STRING;
  178. if (!saltlen)
  179. saltlen = PKCS5_SALT_LEN;
  180. if (!(osalt->data = OPENSSL_malloc (saltlen)))
  181. goto merr;
  182. osalt->length = saltlen;
  183. if (salt)
  184. memcpy (osalt->data, salt, saltlen);
  185. else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0)
  186. goto merr;
  187. if(iter <= 0)
  188. iter = PKCS5_DEFAULT_ITER;
  189. if(!ASN1_INTEGER_set(kdf->iter, iter))
  190. goto merr;
  191. /* If have a key len set it up */
  192. if(keylen > 0)
  193. {
  194. if(!(kdf->keylength = M_ASN1_INTEGER_new()))
  195. goto merr;
  196. if(!ASN1_INTEGER_set (kdf->keylength, keylen))
  197. goto merr;
  198. }
  199. /* prf can stay NULL if we are using hmacWithSHA1 */
  200. if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1)
  201. {
  202. kdf->prf = X509_ALGOR_new();
  203. if (!kdf->prf)
  204. goto merr;
  205. X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid),
  206. V_ASN1_NULL, NULL);
  207. }
  208. /* Finally setup the keyfunc structure */
  209. keyfunc = X509_ALGOR_new();
  210. if (!keyfunc)
  211. goto merr;
  212. keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
  213. /* Encode PBKDF2PARAM into parameter of pbe2 */
  214. if(!(keyfunc->parameter = ASN1_TYPE_new()))
  215. goto merr;
  216. if(!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM),
  217. &keyfunc->parameter->value.sequence))
  218. goto merr;
  219. keyfunc->parameter->type = V_ASN1_SEQUENCE;
  220. PBKDF2PARAM_free(kdf);
  221. return keyfunc;
  222. merr:
  223. ASN1err(ASN1_F_PKCS5_PBKDF2_SET,ERR_R_MALLOC_FAILURE);
  224. PBKDF2PARAM_free(kdf);
  225. X509_ALGOR_free(keyfunc);
  226. return NULL;
  227. }