+ EVP_CIPHER_CTX_init(&ctx);
+
+ /* 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);
+ EVP_CIPHER_CTX_cleanup(&ctx);
+ 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_cleanup(&ctx);
+
+ /* 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:
+ PBE2PARAM_free(pbe2);
+ /* Note 'scheme' is freed as part of pbe2 */
+ X509_ALGOR_free(kalg);
+ X509_ALGOR_free(ret);
+
+ return NULL;