+ X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
+ int alg_nid, keylen;
+ EVP_CIPHER_CTX *ctx = NULL;
+ unsigned char iv[EVP_MAX_IV_LENGTH];
+ PBE2PARAM *pbe2 = NULL;
+ ASN1_OBJECT *obj;
+
+ alg_nid = EVP_CIPHER_type(cipher);
+ if (alg_nid == NID_undef) {
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
+ ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
+ goto err;
+ }
+ obj = OBJ_nid2obj(alg_nid);
+
+ if ((pbe2 = PBE2PARAM_new()) == NULL)
+ goto merr;
+
+ /* Setup the AlgorithmIdentifier for the encryption scheme */
+ scheme = pbe2->encryption;
+ scheme->algorithm = obj;
+ if ((scheme->parameter = ASN1_TYPE_new()) == NULL)
+ goto merr;
+
+ /* Create random IV */
+ if (EVP_CIPHER_iv_length(cipher)) {
+ if (aiv)
+ memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
+ else if (RAND_bytes(iv, EVP_CIPHER_iv_length(cipher)) <= 0)
+ goto err;
+ }
+
+ ctx = EVP_CIPHER_CTX_new();
+ if (ctx == NULL)
+ goto merr;
+
+ /* Dummy cipherinit to just setup the IV, and PRF */
+ if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, iv, 0))
+ goto err;
+ if (EVP_CIPHER_param_to_asn1(ctx, scheme->parameter) < 0) {
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
+ goto err;
+ }
+ /*
+ * If prf NID unspecified see if cipher has a preference. An error is OK
+ * here: just means use default PRF.
+ */
+ if ((prf_nid == -1) &&
+ EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) {
+ ERR_clear_error();
+ prf_nid = NID_hmacWithSHA1;
+ }
+ EVP_CIPHER_CTX_free(ctx);
+ ctx = NULL;
+
+ /* If its RC2 then we'd better setup the key length */
+
+ if (alg_nid == NID_rc2_cbc)
+ keylen = EVP_CIPHER_key_length(cipher);
+ else
+ keylen = -1;
+
+ /* Setup keyfunc */
+
+ X509_ALGOR_free(pbe2->keyfunc);
+
+ pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);
+
+ if (!pbe2->keyfunc)
+ goto merr;
+
+ /* Now set up top level AlgorithmIdentifier */
+
+ if ((ret = X509_ALGOR_new()) == NULL)
+ goto merr;
+
+ ret->algorithm = OBJ_nid2obj(NID_pbes2);
+
+ /* Encode PBE2PARAM into parameter */
+
+ if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBE2PARAM), pbe2,
+ &ret->parameter))
+ goto merr;
+
+ PBE2PARAM_free(pbe2);
+ pbe2 = NULL;
+
+ return ret;
+
+ merr:
+ ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ERR_R_MALLOC_FAILURE);
+
+ err:
+ EVP_CIPHER_CTX_free(ctx);
+ PBE2PARAM_free(pbe2);
+ /* Note 'scheme' is freed as part of pbe2 */
+ X509_ALGOR_free(kalg);
+ X509_ALGOR_free(ret);
+
+ return NULL;