- unsigned char *pbuf, *salt, key[EVP_MAX_KEY_LENGTH];
- int saltlen, keylen, iter, plen;
- PBE2PARAM *pbe2 = NULL;
- const EVP_CIPHER *cipher;
- PBKDF2PARAM *kdf = NULL;
-
- pbuf = param->value.sequence->data;
- plen = param->value.sequence->length;
- if(!param || (param->type != V_ASN1_SEQUENCE) ||
- !(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
- return 0;
- }
-
- /* See if we recognise the key derivation function */
-
- if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
- EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
- goto err;
- }
-
- /* lets see if we recognise the encryption algorithm.
- */
-
- cipher = EVP_get_cipherbyname(
- OBJ_nid2sn(OBJ_obj2nid(pbe2->encryption->algorithm)));
-
- if(!cipher) {
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
- EVP_R_UNSUPPORTED_CIPHER);
- goto err;
- }
-
- /* Fixup cipher based on AlgorithmIdentifier */
- EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de);
- if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
- EVP_R_CIPHER_PARAMETER_ERROR);
- goto err;
- }
- keylen = EVP_CIPHER_CTX_key_length(ctx);
-
- /* Now decode key derivation function */
-
- pbuf = pbe2->keyfunc->parameter->value.sequence->data;
- plen = pbe2->keyfunc->parameter->value.sequence->length;
- if(!pbe2->keyfunc->parameter ||
- (pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE) ||
- !(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
- goto err;
- }
-
- PBE2PARAM_free(pbe2);
- pbe2 = NULL;
-
- /* Now check the parameters of the kdf */
-
- if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != keylen)){
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
- EVP_R_UNSUPPORTED_KEYLENGTH);
- goto err;
- }
-
- if(kdf->prf && (OBJ_obj2nid(kdf->prf->algorithm) != NID_hmacWithSHA1)) {
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
- goto err;
- }
-
- if(kdf->salt->type != V_ASN1_OCTET_STRING) {
- EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
- EVP_R_UNSUPPORTED_SALT_TYPE);
- goto err;
- }
-
- /* it seems that its all OK */
- salt = kdf->salt->value.octet_string->data;
- saltlen = kdf->salt->value.octet_string->length;
- iter = ASN1_INTEGER_get(kdf->iter);
- PKCS5_PBKDF2_HMAC_SHA1(pass, passlen, salt, saltlen, iter, keylen, key);
- EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
- memset(key, 0, keylen);
- PBKDF2PARAM_free(kdf);
- return 1;
-
- err:
- PBE2PARAM_free(pbe2);
- PBKDF2PARAM_free(kdf);
- return 0;
+ unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
+ int saltlen, iter;
+ int rv = 0;
+ unsigned int keylen = 0;
+ int prf_nid, hmac_md_nid;
+ PBKDF2PARAM *kdf = NULL;
+ const EVP_MD *prfmd;
+
+ if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
+ EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET);
+ goto err;
+ }
+ keylen = EVP_CIPHER_CTX_key_length(ctx);
+ OPENSSL_assert(keylen <= sizeof(key));
+
+ /* Decode parameter */
+
+ kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
+
+ if (kdf == NULL) {
+ EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
+ goto err;
+ }
+
+ keylen = EVP_CIPHER_CTX_key_length(ctx);
+
+ /* Now check the parameters of the kdf */
+
+ if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
+ EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_KEYLENGTH);
+ goto err;
+ }
+
+ if (kdf->prf)
+ prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
+ else
+ prf_nid = NID_hmacWithSHA1;
+
+ if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
+ EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
+ goto err;
+ }
+
+ prfmd = EVP_get_digestbynid(hmac_md_nid);
+ if (prfmd == NULL) {
+ EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
+ goto err;
+ }
+
+ if (kdf->salt->type != V_ASN1_OCTET_STRING) {
+ EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_SALT_TYPE);
+ goto err;
+ }
+
+ /* it seems that its all OK */
+ salt = kdf->salt->value.octet_string->data;
+ saltlen = kdf->salt->value.octet_string->length;
+ iter = ASN1_INTEGER_get(kdf->iter);
+ if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
+ keylen, key))
+ goto err;
+ rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
+ err:
+ OPENSSL_cleanse(key, keylen);
+ PBKDF2PARAM_free(kdf);
+ return rv;