prevent a malleability attack; this BREAKS THE PROTOCOL. Also change the library...

[xonotic/d0_blind_id.git] / d0_bignum.h

diff --git a/d0_bignum.h b/d0_bignum.h
index 7eb0e0ab523ba27a5bb6a9356d580e35748bd961..bccaee5256adf24c7752e73e94089bb0eb97712e 100644 (file)
--- a/d0_bignum.h
+++ b/d0_bignum.h
@@ -1,15 +1,20 @@
+#ifndef __D0_BIGNUM_H__
+#define __D0_BIGNUM_H__
+
 #include "d0.h"
 #include "d0_iobuf.h"
 
 typedef struct d0_bignum_s d0_bignum_t;
 
-WARN_UNUSED_RESULT BOOL d0_iobuf_write_bignum(d0_iobuf_t *buf, const d0_bignum_t *bignum);
+WARN_UNUSED_RESULT BOOL d0_iobuf_write_bignum(d0_iobuf_t *buf, const d0_bignum_t *bignum); // byte 0: 01=+ 11=- 00=0, rest = big endian number
 WARN_UNUSED_RESULT d0_bignum_t *d0_iobuf_read_bignum(d0_iobuf_t *buf, d0_bignum_t *bignum);
+WARN_UNUSED_RESULT ssize_t d0_bignum_export_unsigned(const d0_bignum_t *bignum, void *buf, size_t bufsize); // big endian, return value = number of significant bytes (or -1 on error)
+WARN_UNUSED_RESULT d0_bignum_t *d0_bignum_import_unsigned(d0_bignum_t *bignum, const void *buf, size_t bufsize);
 
-void d0_bignum_INITIALIZE();
-void d0_bignum_SHUTDOWN();
+void d0_bignum_INITIALIZE(void);
+void d0_bignum_SHUTDOWN(void);
 
-WARN_UNUSED_RESULT d0_bignum_t *d0_bignum_new();
+WARN_UNUSED_RESULT d0_bignum_t *d0_bignum_new(void);
 void d0_bignum_free(d0_bignum_t *a);
 void d0_bignum_init(d0_bignum_t *b);
 void d0_bignum_clear(d0_bignum_t *a);
@@ -36,3 +41,5 @@ WARN_UNUSED_RESULT int d0_bignum_isprime(d0_bignum_t *r, int param);
 WARN_UNUSED_RESULT d0_bignum_t *d0_bignum_gcd(d0_bignum_t *r, d0_bignum_t *s, d0_bignum_t *t, const d0_bignum_t *a, const d0_bignum_t *b);
 
 WARN_UNUSED_RESULT char *d0_bignum_tostring(const d0_bignum_t *x, unsigned int base); // allocates!
+
+#endif