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Index: mpi-1.8.6/mpi.c
===================================================================
--- mpi-1.8.6.orig/mpi.c 2011-12-09 14:10:41.000000000 -0800
+++ mpi-1.8.6/mpi.c 2011-12-09 14:26:02.000000000 -0800
@@ -1960,6 +1960,30 @@
/* }}} */
+unsigned long mp_hash(mp_int *a)
+{
+ unsigned long hash = 0;
+ int ix;
+ for (ix = 0; ix < USED(a); ix++) {
+ mp_digit d = DIGIT(a, ix);
+#if SIZEOF_LONG < MP_DIGIT_SIZE
+ int j;
+ for (j = 0; j < MP_DIGIT_SIZE / SIZEOF_LONG; j++) {
+ hash ^= d;
+ d >> (SIZEOF_LONG * CHAR_BIT);
+ }
+#elif SIZEOF_LONG == MP_DIGIT_SIZE
+ hash ^= d;
+#else
+ hash <<= MP_DIGIT_BITS;
+ hash ^= d;
+#endif
+ }
+ if (SIGN(a) == MP_NEG)
+ hash = (hash << 16 | hash >> (SIZEOF_LONG * CHAR_BIT - 16));
+ return hash;
+}
+
/*------------------------------------------------------------------------*/
/* {{{ Number theoretic functions */
Index: mpi-1.8.6/mpi.h
===================================================================
--- mpi-1.8.6.orig/mpi.h 2011-12-09 14:10:41.000000000 -0800
+++ mpi-1.8.6/mpi.h 2011-12-09 14:10:41.000000000 -0800
@@ -165,6 +165,8 @@
int mp_isodd(mp_int *a);
int mp_iseven(mp_int *a);
+unsigned long mp_hash(mp_int *a);
+
/*------------------------------------------------------------------------*/
/* Number theoretic */
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