dropbear: rng_make_prng.c comparison

put back the 0.95 makefile which was inadvertently merged over

comparison

equal deleted inserted replaced

--1:000000000000
+:d7da3b1e1540
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+*
+* LibTomCrypt is a library that provides various cryptographic
+* algorithms in a highly modular and flexible manner.
+*
+* The library is free for all purposes without any express
+* guarantee it works.
+*
+* Tom St Denis, [email protected], http://libtomcrypt.org
+*/
+/* portable way to get secure random bits to feed a PRNG */
+#include "mycrypt.h"
+int rng_make_prng(int bits, int wprng, prng_state *prng,
+void (*callback)(void))
+{
+unsigned char buf[256];
+int err;
+_ARGCHK(prng != NULL);
+/* check parameter */
+if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
+return err;
+}
+if (bits < 64 || bits > 1024) {
+return CRYPT_INVALID_PRNGSIZE;
+}
+if ((err = prng_descriptor[wprng].start(prng)) != CRYPT_OK) {
+return err;
+}
+bits = ((bits/8)+((bits&7)!=0?1:0)) * 2;
+if (rng_get_bytes(buf, (unsigned long)bits, callback) != (unsigned long)bits) {
+return CRYPT_ERROR_READPRNG;
+}
+if ((err = prng_descriptor[wprng].add_entropy(buf, (unsigned long)bits, prng)) != CRYPT_OK) {
+return err;
+}
+if ((err = prng_descriptor[wprng].ready(prng)) != CRYPT_OK) {
+return err;
+}
+#ifdef CLEAN_STACK
+zeromem(buf, sizeof(buf));
+#endif
+return CRYPT_OK;
+}

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