bignum: Pass const to ssh_print_bignum()

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

include/libssh/bignum.h

@@ -27,7 +27,7 @@
 
 bignum ssh_make_string_bn(ssh_string string);
 ssh_string ssh_make_bignum_string(bignum num);
-void ssh_print_bignum(const char *which, const bignum num);
+void ssh_print_bignum(const char *which, const_bignum num);
 
 
 #endif /* BIGNUM_H_ */

include/libssh/libgcrypt.h

@@ -78,7 +78,10 @@ int ssh_gcry_rand_range(bignum rnd, bignum max);
 #define bignum_bin2bn(data,datalen,dest) gcry_mpi_scan(dest,GCRYMPI_FMT_USG,data,datalen,NULL)
 #define bignum_bn2dec(num) ssh_gcry_bn2dec(num)
 #define bignum_dec2bn(num, data) ssh_gcry_dec2bn(data, num)
-#define bignum_bn2hex(num,data) gcry_mpi_aprint(GCRYMPI_FMT_HEX,data,NULL,num)
+
+#define bignum_bn2hex(num, data) \
+    gcry_mpi_aprint(GCRYMPI_FMT_HEX, data, NULL, (const gcry_mpi_t)num)
+
 #define bignum_hex2bn(data, num) (gcry_mpi_scan(num,GCRYMPI_FMT_HEX,data,0,NULL)==0?1:0)
 #define bignum_rand(num,bits) 1,gcry_mpi_randomize(num,bits,GCRY_STRONG_RANDOM),gcry_mpi_set_bit(num,bits-1),gcry_mpi_set_bit(num,0)
 #define bignum_mod_exp(dest,generator,exp,modulo, ctx) 1,gcry_mpi_powm(dest,generator,exp,modulo)

include/libssh/libmbedcrypto.h

@@ -75,7 +75,7 @@ struct mbedtls_ecdsa_sig {
 
 bignum ssh_mbedcry_bn_new(void);
 void ssh_mbedcry_bn_free(bignum num);
-unsigned char *ssh_mbedcry_bn2num(bignum num, int radix);
+unsigned char *ssh_mbedcry_bn2num(const_bignum num, int radix);
 int ssh_mbedcry_rand(bignum rnd, int bits, int top, int bottom);
 int ssh_mbedcry_is_bit_set(bignum num, size_t pos);
 int ssh_mbedcry_rand_range(bignum dest, bignum max);

src/bignum.c

@@ -77,7 +77,7 @@ bignum ssh_make_string_bn(ssh_string string)
 }
 
 /* prints the bignum on stderr */
-void ssh_print_bignum(const char *name, const bignum num)
+void ssh_print_bignum(const char *name, const_bignum num)
 {
     unsigned char *hex = NULL;
     if (num != NULL) {

src/mbedcrypto_missing.c

@@ -45,7 +45,7 @@ void ssh_mbedcry_bn_free(bignum bn)
     SAFE_FREE(bn);
 }
 
-unsigned char *ssh_mbedcry_bn2num(bignum num, int radix)
+unsigned char *ssh_mbedcry_bn2num(const_bignum num, int radix)
 {
     char *buf = NULL;
     size_t olen;