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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "CryptoEngine.h"
CRYPT_RESULT _cpri__StirRandom(int32_t num, uint8_t *entropy)
{
return CRYPT_SUCCESS; /* NO-OP on CR50. */
}
#ifdef CRYPTO_TEST_SETUP
#include "endian.h"
#include "extension.h"
#include "trng.h"
/*
* This extension command is similar to TPM2_GetRandom, but made
* available for CRYPTO_TEST = 1 which disables TPM.
* Command structure, shared out of band with the test driver running
* on the host:
*
* field | size | note
* =========================================================================
* text_len | 2 | the number of random bytes to generate, big endian
* type | 1 | 0 = TRNG, other values reserved for extensions
*/
static enum vendor_cmd_rc trng_test(enum vendor_cmd_cc code, void *buf,
size_t input_size, size_t *response_size)
{
uint16_t text_len;
uint8_t *cmd = buf;
uint8_t op_type = 0;
if (input_size != sizeof(text_len) + 1) {
*response_size = 0;
return VENDOR_RC_BOGUS_ARGS;
}
text_len = be16toh(*(uint16_t *)cmd);
op_type = cmd[sizeof(text_len)];
if (text_len > *response_size) {
*response_size = 0;
return VENDOR_RC_BOGUS_ARGS;
}
switch (op_type) {
case 0:
rand_bytes(buf, text_len);
break;
default:
return VENDOR_RC_BOGUS_ARGS;
}
*response_size = text_len;
return VENDOR_RC_SUCCESS;
}
DECLARE_VENDOR_COMMAND(VENDOR_CC_TRNG_TEST, trng_test);
#endif /* CRYPTO_TEST_SETUP */
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