- {
- int ret;
- if (!ctx || !ctx->pmeth || !ctx->pmeth->derive)
- {
- EVPerr(EVP_F_EVP_PKEY_DERIVE_INIT,
- EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
- return -2;
- }
- ctx->operation = EVP_PKEY_OP_DERIVE;
- if (!ctx->pmeth->derive_init)
- return 1;
- ret = ctx->pmeth->derive_init(ctx);
- if (ret <= 0)
- ctx->operation = EVP_PKEY_OP_UNDEFINED;
- return ret;
- }
+{
+ int ret;
+ if (!ctx || !ctx->pmeth || !ctx->pmeth->derive) {
+ EVPerr(EVP_F_EVP_PKEY_DERIVE_INIT,
+ EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
+ return -2;
+ }
+ ctx->operation = EVP_PKEY_OP_DERIVE;
+ if (!ctx->pmeth->derive_init)
+ return 1;
+ ret = ctx->pmeth->derive_init(ctx);
+ if (ret <= 0)
+ ctx->operation = EVP_PKEY_OP_UNDEFINED;
+ return ret;
+}
+
+int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer)
+{
+ int ret;
+ if (!ctx || !ctx->pmeth
+ || !(ctx->pmeth->derive || ctx->pmeth->encrypt || ctx->pmeth->decrypt)
+ || !ctx->pmeth->ctrl) {
+ EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
+ EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
+ return -2;
+ }
+ if (ctx->operation != EVP_PKEY_OP_DERIVE
+ && ctx->operation != EVP_PKEY_OP_ENCRYPT
+ && ctx->operation != EVP_PKEY_OP_DECRYPT) {
+ EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER,
+ EVP_R_OPERATON_NOT_INITIALIZED);
+ return -1;
+ }
+
+ ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 0, peer);
+
+ if (ret <= 0)
+ return ret;
+
+ if (ret == 2)
+ return 1;
+
+ if (!ctx->pkey) {
+ EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_NO_KEY_SET);
+ return -1;
+ }
+
+ if (ctx->pkey->type != peer->type) {
+ EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_KEY_TYPES);
+ return -1;
+ }
+
+ /*
+ * ran@cryptocom.ru: For clarity. The error is if parameters in peer are
+ * present (!missing) but don't match. EVP_PKEY_cmp_parameters may return
+ * 1 (match), 0 (don't match) and -2 (comparison is not defined). -1
+ * (different key types) is impossible here because it is checked earlier.
+ * -2 is OK for us here, as well as 1, so we can check for 0 only.
+ */
+ if (!EVP_PKEY_missing_parameters(peer) &&
+ !EVP_PKEY_cmp_parameters(ctx->pkey, peer)) {
+ EVPerr(EVP_F_EVP_PKEY_DERIVE_SET_PEER, EVP_R_DIFFERENT_PARAMETERS);
+ return -1;
+ }
+
+ EVP_PKEY_free(ctx->peerkey);
+ ctx->peerkey = peer;
+
+ ret = ctx->pmeth->ctrl(ctx, EVP_PKEY_CTRL_PEER_KEY, 1, peer);
+
+ if (ret <= 0) {
+ ctx->peerkey = NULL;
+ return ret;
+ }