initial version of SQIsign

Co-authored-by: Jorge Chavez-Saab <jorgechavezsaab@gmail.com>
Co-authored-by: Maria Corte-Real Santos <36373796+mariascrs@users.noreply.github.com>
Co-authored-by: Luca De Feo <github@defeo.lu>
Co-authored-by: Jonathan Komada Eriksen <jonathan.eriksen97@gmail.com>
Co-authored-by: Basil Hess <bhe@zurich.ibm.com>
Co-authored-by: Antonin Leroux <18654258+tonioecto@users.noreply.github.com>
Co-authored-by: Patrick Longa <plonga@microsoft.com>
Co-authored-by: Lorenz Panny <lorenz@yx7.cc>
Co-authored-by: Francisco Rodríguez-Henríquez <francisco.rodriguez@tii.ae>
Co-authored-by: Sina Schaeffler <108983332+syndrakon@users.noreply.github.com>
Co-authored-by: Benjamin Wesolowski <19474926+Calodeon@users.noreply.github.com>

src/common/generic/include/tutil.h

@@ -0,0 +1,33 @@
+#ifndef TUTIL_H
+#define TUTIL_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#if defined(__GNUC__) || defined(__clang__)
+#define BSWAP32(i) __builtin_bswap32((i))
+#define BSWAP64(i) __builtin_bswap64((i))
+#else
+#define BSWAP32(i) ((((i) >> 24) & 0xff) | (((i) >> 8) & 0xff00) | (((i) & 0xff00) << 8) | ((i) << 24))
+#define BSWAP64(i) ((BSWAP32((i) >> 32) & 0xffffffff) | (BSWAP32(i) << 32)
+#endif
+
+#if defined(RADIX_64)
+#define digit_t uint64_t
+#define sdigit_t int64_t
+#define DIGIT_LEN 8
+#define RADIX 64
+#define LOG2RADIX 6
+#define BSWAP_DIGIT(i) BSWAP64(i)
+#elif defined(RADIX_32)
+#define digit_t uint32_t
+#define sdigit_t int32_t
+#define DIGIT_LEN 4
+#define RADIX 32
+#define LOG2RADIX 5
+#define BSWAP_DIGIT(i) BSWAP32(i)
+#else
+#error "Radix must be 32bit or 64 bit"
+#endif
+
+#endif