- X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
- int alg_nid;
- EVP_CIPHER_CTX ctx;
- unsigned char iv[EVP_MAX_IV_LENGTH];
- PBKDF2PARAM *kdf = NULL;
- PBE2PARAM *pbe2 = NULL;
- ASN1_OCTET_STRING *osalt = 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())) goto merr;
-
- /* Setup the AlgorithmIdentifier for the encryption scheme */
- scheme = pbe2->encryption;
-
- scheme->algorithm = obj;
- if(!(scheme->parameter = ASN1_TYPE_new())) goto merr;
-
- /* Create random IV */
- if (EVP_CIPHER_iv_length(cipher))
- {
- if (aiv)
- memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
- else if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
- goto err;
- }
-
- EVP_CIPHER_CTX_init(&ctx);
-
- /* Dummy cipherinit to just setup the IV, and PRF */
- EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0);
- 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(!(kdf = PBKDF2PARAM_new())) goto merr;
- if(!(osalt = M_ASN1_OCTET_STRING_new())) goto merr;
-
- if (!saltlen) saltlen = PKCS5_SALT_LEN;
- if (!(osalt->data = OPENSSL_malloc (saltlen))) goto merr;
- osalt->length = saltlen;
- if (salt) memcpy (osalt->data, salt, saltlen);
- else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) goto merr;
-
- if(iter <= 0) iter = PKCS5_DEFAULT_ITER;
- if(!ASN1_INTEGER_set(kdf->iter, iter)) goto merr;
-
- /* Now include salt in kdf structure */
- kdf->salt->value.octet_string = osalt;
- kdf->salt->type = V_ASN1_OCTET_STRING;
- osalt = NULL;
-
- /* If its RC2 then we'd better setup the key length */
-
- if(alg_nid == NID_rc2_cbc) {
- if(!(kdf->keylength = M_ASN1_INTEGER_new())) goto merr;
- if(!ASN1_INTEGER_set (kdf->keylength,
- EVP_CIPHER_key_length(cipher))) goto merr;
- }
-
- /* prf can stay NULL if we are using hmacWithSHA1 */
- if (prf_nid != NID_hmacWithSHA1)
- {
- kdf->prf = X509_ALGOR_new();
- if (!kdf->prf)
- goto merr;
- X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid),
- V_ASN1_NULL, NULL);
- }
-
- /* Now setup the PBE2PARAM keyfunc structure */
-
- pbe2->keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
-
- /* Encode PBKDF2PARAM into parameter of pbe2 */
-
- if(!(pbe2->keyfunc->parameter = ASN1_TYPE_new())) goto merr;
-
- if(!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM),
- &pbe2->keyfunc->parameter->value.sequence)) goto merr;
- pbe2->keyfunc->parameter->type = V_ASN1_SEQUENCE;
-
- PBKDF2PARAM_free(kdf);
- kdf = NULL;
-
- /* Now set up top level AlgorithmIdentifier */
-
- if(!(ret = X509_ALGOR_new())) goto merr;
- if(!(ret->parameter = ASN1_TYPE_new())) goto merr;
-
- ret->algorithm = OBJ_nid2obj(NID_pbes2);
-
- /* Encode PBE2PARAM into parameter */