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-rw-r--r--include/olm/crypto.hh26
-rw-r--r--include/olm/memory.hh49
-rw-r--r--include/olm/ratchet.hh2
3 files changed, 60 insertions, 17 deletions
diff --git a/include/olm/crypto.hh b/include/olm/crypto.hh
index b845bfe..7a05f8d 100644
--- a/include/olm/crypto.hh
+++ b/include/olm/crypto.hh
@@ -20,28 +20,27 @@
namespace olm {
+static const std::size_t KEY_LENGTH = 32;
+static const std::size_t SIGNATURE_LENGTH = 64;
+static const std::size_t IV_LENGTH = 16;
struct Curve25519PublicKey {
- static const int LENGTH = 32;
- std::uint8_t public_key[32];
+ std::uint8_t public_key[KEY_LENGTH];
};
struct Curve25519KeyPair : public Curve25519PublicKey {
- static const int LENGTH = 64;
- std::uint8_t private_key[32];
+ std::uint8_t private_key[KEY_LENGTH];
};
struct Ed25519PublicKey {
- static const int LENGTH = 32;
- std::uint8_t public_key[32];
+ std::uint8_t public_key[KEY_LENGTH];
};
struct Ed25519KeyPair : public Ed25519PublicKey {
- static const int LENGTH = 64;
- std::uint8_t private_key[32];
+ std::uint8_t private_key[KEY_LENGTH];
};
@@ -52,9 +51,6 @@ void curve25519_generate_key(
);
-const std::size_t CURVE25519_SHARED_SECRET_LENGTH = 32;
-
-
/** Create a shared secret using our private key and their public key.
* The output buffer must be at least 32 bytes long. */
void curve25519_shared_secret(
@@ -109,14 +105,12 @@ bool ed25519_verify(
struct Aes256Key {
- static const int LENGTH = 32;
- std::uint8_t key[32];
+ std::uint8_t key[KEY_LENGTH];
};
struct Aes256Iv {
- static const int LENGTH = 16;
- std::uint8_t iv[16];
+ std::uint8_t iv[IV_LENGTH];
};
@@ -156,7 +150,7 @@ void sha256(
);
-const std::size_t HMAC_SHA256_OUTPUT_LENGTH = 32;
+const std::size_t SHA256_OUTPUT_LENGTH = 32;
/** HMAC: Keyed-Hashing for Message Authentication
diff --git a/include/olm/memory.hh b/include/olm/memory.hh
index b19c74b..128990a 100644
--- a/include/olm/memory.hh
+++ b/include/olm/memory.hh
@@ -14,6 +14,8 @@
*/
#include <cstddef>
#include <cstdint>
+#include <cstring>
+#include <type_traits>
namespace olm {
@@ -35,4 +37,51 @@ bool is_equal(
std::size_t length
);
+/** Check if two fixed size arrays are equals */
+template<typename T>
+bool array_equal(
+ T const & array_a,
+ T const & array_b
+) {
+ static_assert(
+ std::is_array<T>::value
+ && std::is_convertible<T, std::uint8_t *>::value
+ && sizeof(T) > 0,
+ "Arguments to array_equal must be std::uint8_t arrays[]."
+ );
+ return is_equal(array_a, array_b, sizeof(T));
+}
+
+/** Copy into a fixed size array */
+template<typename T>
+std::uint8_t const * load_array(
+ T & destination,
+ std::uint8_t const * source
+) {
+ static_assert(
+ std::is_array<T>::value
+ && std::is_convertible<T, std::uint8_t *>::value
+ && sizeof(T) > 0,
+ "The first argument to load_array must be a std::uint8_t array[]."
+ );
+ std::memcpy(destination, source, sizeof(T));
+ return source + sizeof(T);
+}
+
+/** Copy from a fixed size array */
+template<typename T>
+std::uint8_t * store_array(
+ std::uint8_t * destination,
+ T const & source
+) {
+ static_assert(
+ std::is_array<T>::value
+ && std::is_convertible<T, std::uint8_t *>::value
+ && sizeof(T) > 0,
+ "The second argument to store_array must be a std::uint8_t array[]."
+ );
+ std::memcpy(destination, source, sizeof(T));
+ return destination + sizeof(T);
+}
+
} // namespace olm
diff --git a/include/olm/ratchet.hh b/include/olm/ratchet.hh
index 7274255..2393e5b 100644
--- a/include/olm/ratchet.hh
+++ b/include/olm/ratchet.hh
@@ -21,7 +21,7 @@ namespace olm {
class Cipher;
-typedef std::uint8_t SharedKey[32];
+typedef std::uint8_t SharedKey[olm::KEY_LENGTH];
struct ChainKey {