1 files changed, 62 insertions, 0 deletions
diff --git a/src/core/crypto_backends.h b/src/core/crypto_backends.h
new file mode 100644
index 0000000..0a7f1a1
--- /dev/null
+++ b/src/core/crypto_backends.h
@@ -0,0 +1,62 @@
+#ifndef HYBBX_CRYPTO_BACKENDS_H
+#define HYBBX_CRYPTO_BACKENDS_H
+
+#include "hybbx/types.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define HYBBX_BACKEND_SHA256_HEX_SIZE 65
+#define HYBBX_BACKEND_AES_GCM_KEY_SIZE 32
+#define HYBBX_BACKEND_AES_GCM_NONCE_SIZE 12
+#define HYBBX_BACKEND_AES_GCM_TAG_SIZE 16
+#define HYBBX_BACKEND_XCHACHA_NONCE_SIZE 24
+#define HYBBX_BACKEND_TAG_SIZE 16
+
+void hybbx_backend_sha256_hex(const char *data, size_t len, char hex[65]);
+
+int hybbx_backend_aes256gcm_encrypt(
+    const uint8_t key[HYBBX_BACKEND_AES_GCM_KEY_SIZE],
+    const uint8_t nonce[HYBBX_BACKEND_AES_GCM_NONCE_SIZE],
+    const uint8_t *aad, size_t aad_len, const uint8_t *plaintext,
+    size_t plaintext_len, uint8_t *ciphertext,
+    uint8_t tag[HYBBX_BACKEND_AES_GCM_TAG_SIZE]);
+
+int hybbx_backend_aes256gcm_decrypt(
+    const uint8_t key[HYBBX_BACKEND_AES_GCM_KEY_SIZE],
+    const uint8_t nonce[HYBBX_BACKEND_AES_GCM_NONCE_SIZE],
+    const uint8_t *aad, size_t aad_len, const uint8_t *ciphertext,
+    size_t ciphertext_len, uint8_t *plaintext,
+    const uint8_t tag[HYBBX_BACKEND_AES_GCM_TAG_SIZE]);
+
+void hybbx_backend_chacha_lock(uint8_t *ciphertext, uint8_t tag[16],
+                             const uint8_t key[32],
+                             const uint8_t nonce[24], const uint8_t *aad,
+                             size_t aad_len, const uint8_t *plaintext,
+                             size_t plaintext_len);
+
+int hybbx_backend_chacha_unlock(uint8_t *plaintext, const uint8_t tag[16],
+                              const uint8_t key[32], const uint8_t nonce[24],
+                              const uint8_t *aad, size_t aad_len,
+                              const uint8_t *ciphertext, size_t ciphertext_len);
+
+void hybbx_backend_x25519_public_key(uint8_t public_key[32],
+                                     const uint8_t secret_key[32]);
+void hybbx_backend_x25519_shared(uint8_t shared[32],
+                                 const uint8_t secret_key[32],
+                                 const uint8_t peer_public_key[32]);
+void hybbx_backend_blake2b_keyed(uint8_t *hash, size_t hash_size,
+                                 const uint8_t *message, size_t message_size,
+                                 const uint8_t *key, size_t key_size);
+
+hybbx_result_t hybbx_backend_random(uint8_t *buf, size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HYBBX_CRYPTO_BACKENDS_H */