mirror of
https://github.com/yuzu-emu/mbedtls.git
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44bfbe3b95
As a result, the copyright of contributors other than Arm is now
acknowledged, and the years of publishing are no longer tracked in the
source files.
Also remove the now-redundant lines declaring that the files are part of
MbedTLS.
This commit was generated using the following script:
# ========================
#!/bin/sh
# Find files
find '(' -path './.git' -o -path './3rdparty' ')' -prune -o -type f -print | xargs sed -bi '
# Replace copyright attribution line
s/Copyright.*Arm.*/Copyright The Mbed TLS Contributors/I
# Remove redundant declaration and the preceding line
$!N
/This file is part of Mbed TLS/Id
P
D
'
# ========================
Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*
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* Hardware entropy collector for the K64F, using Freescale's RNGA
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*
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* This file is provided under the Apache License 2.0, or the
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* GNU General Public License v2.0 or later.
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*
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* **********
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* Apache License 2.0:
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* **********
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*
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* **********
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* GNU General Public License v2.0 or later:
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* **********
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*/
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/*
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* WARNING: this is temporary!
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* This should be in a separate yotta module which would be a target
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* dependency of mbedtls (see IOTSSL-313)
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*/
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#if defined(TARGET_LIKE_K64F)
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/*
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* Reference: "K64 Sub-Family Reference Manual, Rev. 2", chapter 34
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*/
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#include "fsl_clock_manager.h"
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/*
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* Get one byte of entropy from the RNG, assuming it is up and running.
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* As recommended (34.1.1), get only one bit of each output.
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*/
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static void rng_get_byte( unsigned char *byte )
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{
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size_t bit;
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/* 34.5 Steps 3-4-5: poll SR and read from OR when ready */
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for( bit = 0; bit < 8; bit++ )
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{
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while( ( RNG->SR & RNG_SR_OREG_LVL_MASK ) == 0 );
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*byte |= ( RNG->OR & 1 ) << bit;
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}
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}
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/*
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* Get len bytes of entropy from the hardware RNG.
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*/
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int mbedtls_hardware_poll( void *data,
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unsigned char *output, size_t len, size_t *olen )
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{
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size_t i;
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int ret;
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((void) data);
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CLOCK_SYS_EnableRngaClock( 0 );
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/* Set "Interrupt Mask", "High Assurance" and "Go",
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* unset "Clear interrupt" and "Sleep" */
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RNG->CR = RNG_CR_INTM_MASK | RNG_CR_HA_MASK | RNG_CR_GO_MASK;
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for( i = 0; i < len; i++ )
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rng_get_byte( output + i );
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/* Just be extra sure that we didn't do it wrong */
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if( ( RNG->SR & RNG_SR_SECV_MASK ) != 0 )
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{
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ret = -1;
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goto cleanup;
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}
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*olen = len;
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ret = 0;
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cleanup:
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/* Disable clock to save power - assume we're the only users of RNG */
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CLOCK_SYS_DisableRngaClock( 0 );
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return( ret );
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}
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#endif
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