Add CRC64 (ECMA).

crc64.h

@@ -0,0 +1,31 @@
+/*
+ * This file is part of the Aaru Data Preservation Suite.
+ * Copyright (c) 2019-2021 Natalia Portillo.
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+typedef struct
+{
+    uint64_t crc;
+    uint64_t table[256];
+} crc64_ctx;
+
+#define CRC64_ECMA_POLY 0xC96C5795D7870F42
+#define CRC64_ECMA_SEED 0xFFFFFFFFFFFFFFFF
+
+crc64_ctx* crc64_init();
+int crc64_update(crc64_ctx* ctx, const uint8_t* data, uint32_t len);
+int crc64_final(crc64_ctx* ctx, uint64_t* crc);
+void crc64_free(crc64_ctx* ctx);