Import Mbed OS hard-float snapshot

connectivity/drivers/mbedtls/FEATURE_CRYPTOCELL310/source/trng.c

@@ -0,0 +1,90 @@
+ /*
+  *  trng.c
+  *
+  *  Copyright (C) 2017, Arm Limited, All Rights Reserved
+  *  SPDX-License-Identifier: Apache-2.0
+  *
+  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+  *  not use this file except in compliance with the License.
+  *  You may obtain a copy of the License at
+  *
+  *  http://www.apache.org/licenses/LICENSE-2.0
+  *
+  *  Unless required by applicable law or agreed to in writing, software
+  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  *  See the License for the specific language governing permissions and
+  *  limitations under the License.
+  *
+  */
+
+#if DEVICE_TRNG
+
+#include <string.h>
+#include "trng_api.h"
+#include "mbedtls/platform.h"
+
+extern mbedtls_platform_context  plat_ctx;
+static CRYS_RND_WorkBuff_t  rndWorkBuff = { { 0 } };
+
+/* Implementation that should never be optimized out by the compiler */
+static void mbedtls_zeroize( void *v, size_t n ) {
+    volatile unsigned char *p = (unsigned char*)v;
+    while( n-- ) *p++ = 0;
+}
+
+CRYSError_t RNG_PLAT_SetUserRngParameters(
+                         CRYS_RND_State_t  *pRndState,
+                         CRYS_RND_Params_t *pTrngParams);
+
+CRYSError_t LLF_RND_GetTrngSource(
+                         CRYS_RND_State_t  *rndState_ptr,
+                         CRYS_RND_Params_t *trngParams_ptr,
+                         SaSiBool_t        isContinued,
+                         uint32_t          *entropySize_ptr,
+                         uint32_t          **sourceOut_ptr_ptr,
+                         uint32_t          *sourceOutSize_ptr,
+                         uint32_t          *rndWorkBuff_ptr);
+
+
+void trng_init(trng_t *obj)
+{
+    RNG_PLAT_SetUserRngParameters(&plat_ctx.platform_impl_ctx.rndState, obj);
+}
+
+void trng_free(trng_t *obj)
+{
+    (void)obj;
+}
+
+
+int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *outputLength)
+{
+    (void)obj;
+    int ret;
+    uint32_t entropySizeBits;
+    uint32_t *entrSource_ptr;
+    uint32_t actualLength;
+
+    ret = LLF_RND_GetTrngSource(
+                &plat_ctx.platform_impl_ctx.rndState ,    /*in/out*/
+                obj,       /*in/out*/
+                0,       /*in*/
+                &entropySizeBits,  /*in/out*/
+                &entrSource_ptr,   /*out*/
+                &actualLength,  /*out*/
+                (uint32_t*)&rndWorkBuff.crysRndWorkBuff /*in*/);
+    if ( ret != 0 )
+        return -1;
+
+    if ( length < actualLength )
+        actualLength = length;
+
+    *outputLength = actualLength;
+
+    memcpy( output, entrSource_ptr + CRYS_RND_TRNG_SRC_INNER_OFFSET_WORDS, *outputLength );
+    mbedtls_zeroize( entrSource_ptr + CRYS_RND_TRNG_SRC_INNER_OFFSET_WORDS, *outputLength );
+    return 0;
+}
+
+#endif //DEVICE_TRNG