static int
wrap_nettle_rnd (void *_ctx, int level, void *data, size_t datasize)
{
int ret;
RND_LOCK;
ret = do_trivia_source (0);
if (ret < 0)
{
RND_UNLOCK;
gnutls_assert ();
return ret;
}
ret = do_device_source (0);
if (ret < 0)
{
RND_UNLOCK;
gnutls_assert ();
return ret;
}
yarrow256_random (&yctx, datasize, data);
RND_UNLOCK;
return 0;
}
static int
process_file(struct rsa_session *ctx,
FILE *in, FILE *out)
{
uint8_t buffer[BLOCK_SIZE + SHA1_DIGEST_SIZE];
for (;;)
{
size_t size = fread(buffer, 1, BLOCK_SIZE, in);
hmac_sha1_update(&ctx->hmac, size, buffer);
if (size < BLOCK_SIZE)
{
unsigned leftover;
unsigned padding;
if (ferror(in))
{
werror("Reading input failed: %s\n", strerror(errno));
return 0;
}
leftover = size % AES_BLOCK_SIZE;
padding = AES_BLOCK_SIZE - leftover;
assert (size + padding <= BLOCK_SIZE);
if (padding > 1)
yarrow256_random(&ctx->yarrow, padding - 1, buffer + size);
size += padding;
buffer[size - 1] = padding;
CBC_ENCRYPT(&ctx->aes, aes_encrypt, size, buffer, buffer);
assert (size + SHA1_DIGEST_SIZE <= sizeof(buffer));
hmac_sha1_digest(&ctx->hmac, SHA1_DIGEST_SIZE, buffer + size);
size += SHA1_DIGEST_SIZE;
if (!write_string(out, size, buffer))
{
werror("Writing output failed: %s\n", strerror(errno));
return 0;
}
return 1;
}
CBC_ENCRYPT(&ctx->aes, aes_encrypt, size, buffer, buffer);
if (!write_string(out, size, buffer))
{
werror("Writing output failed: %s\n", strerror(errno));
return 0;
}
}
}
static int
wrap_nettle_rnd(void *_ctx, int level, void *data, size_t datasize)
{
int ret, reseed = 0;
struct event_st event;
if (level == GNUTLS_RND_NONCE)
return wrap_nettle_rnd_nonce(_ctx, data, datasize);
_rnd_get_event(&event);
RND_LOCK(&rnd_ctx);
if (_gnutls_detect_fork(rnd_ctx.forkid)) { /* fork() detected */
memset(&rnd_ctx.device_last_read, 0, sizeof(rnd_ctx.device_last_read));
reseed = 1;
}
/* reseed main */
ret = do_trivia_source(&rnd_ctx, 0, &event);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
ret = do_device_source(&rnd_ctx, 0, &event);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
if (reseed != 0) {
yarrow256_slow_reseed(&rnd_ctx.yctx);
rnd_ctx.forkid = _gnutls_get_forkid();
}
yarrow256_random(&rnd_ctx.yctx, datasize, data);
ret = 0;
cleanup:
RND_UNLOCK(&rnd_ctx);
return ret;
}
int
main(int argc, char **argv)
{
struct rsa_session ctx;
struct rsa_session_info info;
struct rsa_public_key key;
mpz_t x;
int c;
const char *random_name = NULL;
enum { OPT_HELP = 300 };
static const struct option options[] =
{
/* Name, args, flag, val */
{ "help", no_argument, NULL, OPT_HELP },
{ "random", required_argument, NULL, 'r' },
{ NULL, 0, NULL, 0}
};
while ( (c = getopt_long(argc, argv, "o:r:", options, NULL)) != -1)
switch (c)
{
case 'r':
random_name = optarg;
break;
case '?':
return EXIT_FAILURE;
case OPT_HELP:
usage(stdout);
return EXIT_SUCCESS;
default:
abort();
}
argv += optind;
argc -= optind;
if (argc != 1)
{
usage (stderr);
return EXIT_FAILURE;
}
rsa_public_key_init(&key);
if (!read_rsa_key(argv[0], &key, NULL))
{
werror("Invalid key\n");
return EXIT_FAILURE;
}
/* NOTE: No sources */
yarrow256_init(&ctx.yarrow, 0, NULL);
/* Read some data to seed the generator */
if (!simple_random(&ctx.yarrow, random_name))
{
werror("Initialization of randomness generator failed.\n");
return EXIT_FAILURE;
}
WRITE_UINT32(SESSION_VERSION(&info), RSA_VERSION);
yarrow256_random(&ctx.yarrow, sizeof(info.key) - 4, info.key + 4);
rsa_session_set_encrypt_key(&ctx, &info);
#ifdef WIN32
_setmode(0, O_BINARY);
_setmode(1, O_BINARY);
#endif
write_version(stdout);
mpz_init(x);
if (!rsa_encrypt(&key,
&ctx.yarrow, (nettle_random_func *) yarrow256_random,
sizeof(info.key), info.key,
x))
{
werror("RSA encryption failed.\n");
return EXIT_FAILURE;
}
write_bignum(stdout, x);
mpz_clear (x);
if (!process_file(&ctx,
stdin, stdout))
return EXIT_FAILURE;
rsa_public_key_clear(&key);
return EXIT_SUCCESS;
}
//Return randomly generated uint8 value of specified size
void gen_random(struct yarrow256_ctx *ctx, size_t s, uint8_t *r) {
yarrow256_random(ctx, s, r); //generate s bytes of PR, store in r
}
void strongRandomize(void* buffer, unsigned int length){
Q_ASSERT(yarrow256_is_seeded(&StrongCtx));
for(uint i=0; i<length;i++)
yarrow256_random(&StrongCtx,1,(quint8*)buffer+i);
}
void randomize(void* buffer, unsigned int length){
if(!yarrow256_is_seeded(&StrongCtx))
yarrow256_random(&WeakCtx,length,(quint8*)buffer);
else
yarrow256_random(&StrongCtx,length,(quint8*)buffer);
}