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-rw-r--r--src/pk.cpp86
1 files changed, 85 insertions, 1 deletions
diff --git a/src/pk.cpp b/src/pk.cpp
index 8db958a..5db472c 100644
--- a/src/pk.cpp
+++ b/src/pk.cpp
@@ -1,4 +1,4 @@
-/* Copyright 2018 New Vector Ltd
+/* Copyright 2018, 2019 New Vector Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -409,4 +409,88 @@ size_t olm_pk_get_private_key(
return olm_pk_private_key_length();
}
+struct OlmPkSigning {
+ OlmErrorCode last_error;
+ _olm_ed25519_key_pair key_pair;
+};
+
+size_t olm_pk_signing_size(void) {
+ return sizeof(OlmPkSigning);
+}
+
+OlmPkSigning *olm_pk_signing(void * memory) {
+ olm::unset(memory, sizeof(OlmPkSigning));
+ return new(memory) OlmPkSigning;
+}
+
+const char * olm_pk_signing_last_error(OlmPkSigning * sign) {
+ auto error = sign->last_error;
+ return _olm_error_to_string(error);
+}
+
+size_t olm_clear_pk_signing(OlmPkSigning *sign) {
+ /* Clear the memory backing the signing */
+ olm::unset(sign, sizeof(OlmPkSigning));
+ /* Initialise a fresh signing object in case someone tries to use it */
+ new(sign) OlmPkSigning();
+ return sizeof(OlmPkSigning);
+}
+
+size_t olm_pk_sign_seed_length(void) {
+ return ED25519_RANDOM_LENGTH;
+}
+
+size_t olm_pk_sign_public_key_length(void) {
+ return olm::encode_base64_length(ED25519_PUBLIC_KEY_LENGTH);
+}
+
+size_t olm_pk_signing_key_from_seed(
+ OlmPkSigning * signing,
+ void * pubkey, size_t pubkey_length,
+ void * seed, size_t seed_length
+) {
+ if (pubkey_length < olm_pk_sign_public_key_length()) {
+ signing->last_error =
+ OlmErrorCode::OLM_OUTPUT_BUFFER_TOO_SMALL;
+ return std::size_t(-1);
+ }
+ if (seed_length < olm_pk_sign_seed_length()) {
+ signing->last_error =
+ OlmErrorCode::OLM_INPUT_BUFFER_TOO_SMALL;
+ return std::size_t(-1);
+ }
+
+ _olm_crypto_ed25519_generate_key((uint8_t *) seed, &signing->key_pair);
+ olm::encode_base64(
+ (const uint8_t *)signing->key_pair.public_key.public_key,
+ ED25519_PUBLIC_KEY_LENGTH,
+ (uint8_t *)pubkey
+ );
+ return 0;
+}
+
+size_t olm_pk_signature_length() {
+ return olm::encode_base64_length(ED25519_SIGNATURE_LENGTH);
+}
+
+#include "olm/utility.hh"
+
+size_t olm_pk_sign(
+ OlmPkSigning *signing,
+ uint8_t const * message, size_t message_length,
+ uint8_t * signature, size_t signature_length
+) {
+ if (signature_length < olm_pk_signature_length()) {
+ signing->last_error = OlmErrorCode::OLM_OUTPUT_BUFFER_TOO_SMALL;
+ return std::size_t(-1);
+ }
+ uint8_t *raw_sig = signature + olm_pk_signature_length() - ED25519_SIGNATURE_LENGTH;
+ _olm_crypto_ed25519_sign(
+ &signing->key_pair,
+ message, message_length, raw_sig
+ );
+ olm::encode_base64(raw_sig, ED25519_SIGNATURE_LENGTH, signature);
+ return olm_pk_signature_length();
+}
+
}