Add ecdsa_from_keypair()
Also fix bug/limitation in mpi_copy: would segfault if src just initialised
and not set to a value yet. (This case occurs when copying a context which
contains only the public part of the key, eg.)
diff --git a/library/bignum.c b/library/bignum.c
index cc4b1f3..b0bbf8f 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -130,6 +130,12 @@
if( X == Y )
return( 0 );
+ if( Y->p == NULL )
+ {
+ mpi_free( X );
+ return( 0 );
+ }
+
for( i = Y->n - 1; i > 0; i-- )
if( Y->p[i] != 0 )
break;