509 lines
17 KiB
C
509 lines
17 KiB
C
/**
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* \file chacha20.c
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*
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* \brief ChaCha20 cipher.
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*
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* \author Daniel King <damaki.gh@gmail.com>
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-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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#include "common.h"
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#if defined(MBEDTLS_CHACHA20_C)
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#include "mbedtls/chacha20.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include <stddef.h>
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#include <string.h>
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#include "mbedtls/platform.h"
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#if !defined(MBEDTLS_CHACHA20_ALT)
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#define ROTL32( value, amount ) \
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( (uint32_t) ( (value) << (amount) ) | ( (value) >> ( 32 - (amount) ) ) )
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#define CHACHA20_CTR_INDEX ( 12U )
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#define CHACHA20_BLOCK_SIZE_BYTES ( 4U * 16U )
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/**
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* \brief ChaCha20 quarter round operation.
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*
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* The quarter round is defined as follows (from RFC 7539):
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* 1. a += b; d ^= a; d <<<= 16;
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* 2. c += d; b ^= c; b <<<= 12;
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* 3. a += b; d ^= a; d <<<= 8;
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* 4. c += d; b ^= c; b <<<= 7;
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*
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* \param state ChaCha20 state to modify.
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* \param a The index of 'a' in the state.
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* \param b The index of 'b' in the state.
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* \param c The index of 'c' in the state.
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* \param d The index of 'd' in the state.
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*/
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static inline void chacha20_quarter_round( uint32_t state[16],
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size_t a,
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size_t b,
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size_t c,
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size_t d )
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{
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/* a += b; d ^= a; d <<<= 16; */
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state[a] += state[b];
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state[d] ^= state[a];
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state[d] = ROTL32( state[d], 16 );
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/* c += d; b ^= c; b <<<= 12 */
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state[c] += state[d];
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state[b] ^= state[c];
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state[b] = ROTL32( state[b], 12 );
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/* a += b; d ^= a; d <<<= 8; */
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state[a] += state[b];
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state[d] ^= state[a];
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state[d] = ROTL32( state[d], 8 );
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/* c += d; b ^= c; b <<<= 7; */
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state[c] += state[d];
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state[b] ^= state[c];
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state[b] = ROTL32( state[b], 7 );
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}
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/**
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* \brief Perform the ChaCha20 inner block operation.
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*
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* This function performs two rounds: the column round and the
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* diagonal round.
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*
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* \param state The ChaCha20 state to update.
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*/
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static void chacha20_inner_block( uint32_t state[16] )
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{
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chacha20_quarter_round( state, 0, 4, 8, 12 );
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chacha20_quarter_round( state, 1, 5, 9, 13 );
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chacha20_quarter_round( state, 2, 6, 10, 14 );
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chacha20_quarter_round( state, 3, 7, 11, 15 );
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chacha20_quarter_round( state, 0, 5, 10, 15 );
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chacha20_quarter_round( state, 1, 6, 11, 12 );
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chacha20_quarter_round( state, 2, 7, 8, 13 );
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chacha20_quarter_round( state, 3, 4, 9, 14 );
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}
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/**
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* \brief Generates a keystream block.
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*
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* \param initial_state The initial ChaCha20 state (key, nonce, counter).
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* \param keystream Generated keystream bytes are written to this buffer.
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*/
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static void chacha20_block( const uint32_t initial_state[16],
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unsigned char keystream[64] )
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{
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uint32_t working_state[16];
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size_t i;
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memcpy( working_state,
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initial_state,
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CHACHA20_BLOCK_SIZE_BYTES );
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for( i = 0U; i < 10U; i++ )
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chacha20_inner_block( working_state );
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working_state[ 0] += initial_state[ 0];
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working_state[ 1] += initial_state[ 1];
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working_state[ 2] += initial_state[ 2];
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working_state[ 3] += initial_state[ 3];
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working_state[ 4] += initial_state[ 4];
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working_state[ 5] += initial_state[ 5];
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working_state[ 6] += initial_state[ 6];
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working_state[ 7] += initial_state[ 7];
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working_state[ 8] += initial_state[ 8];
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working_state[ 9] += initial_state[ 9];
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working_state[10] += initial_state[10];
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working_state[11] += initial_state[11];
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working_state[12] += initial_state[12];
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working_state[13] += initial_state[13];
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working_state[14] += initial_state[14];
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working_state[15] += initial_state[15];
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for( i = 0U; i < 16; i++ )
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{
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size_t offset = i * 4U;
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MBEDTLS_PUT_UINT32_LE(working_state[i], keystream, offset);
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}
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mbedtls_platform_zeroize( working_state, sizeof( working_state ) );
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}
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void mbedtls_chacha20_init( mbedtls_chacha20_context *ctx )
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{
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mbedtls_platform_zeroize( ctx->state, sizeof( ctx->state ) );
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mbedtls_platform_zeroize( ctx->keystream8, sizeof( ctx->keystream8 ) );
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/* Initially, there's no keystream bytes available */
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ctx->keystream_bytes_used = CHACHA20_BLOCK_SIZE_BYTES;
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}
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void mbedtls_chacha20_free( mbedtls_chacha20_context *ctx )
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{
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if( ctx != NULL )
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{
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mbedtls_platform_zeroize( ctx, sizeof( mbedtls_chacha20_context ) );
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}
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}
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int mbedtls_chacha20_setkey( mbedtls_chacha20_context *ctx,
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const unsigned char key[32] )
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{
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/* ChaCha20 constants - the string "expand 32-byte k" */
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ctx->state[0] = 0x61707865;
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ctx->state[1] = 0x3320646e;
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ctx->state[2] = 0x79622d32;
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ctx->state[3] = 0x6b206574;
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/* Set key */
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ctx->state[4] = MBEDTLS_GET_UINT32_LE( key, 0 );
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ctx->state[5] = MBEDTLS_GET_UINT32_LE( key, 4 );
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ctx->state[6] = MBEDTLS_GET_UINT32_LE( key, 8 );
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ctx->state[7] = MBEDTLS_GET_UINT32_LE( key, 12 );
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ctx->state[8] = MBEDTLS_GET_UINT32_LE( key, 16 );
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ctx->state[9] = MBEDTLS_GET_UINT32_LE( key, 20 );
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ctx->state[10] = MBEDTLS_GET_UINT32_LE( key, 24 );
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ctx->state[11] = MBEDTLS_GET_UINT32_LE( key, 28 );
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return( 0 );
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}
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int mbedtls_chacha20_starts( mbedtls_chacha20_context* ctx,
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const unsigned char nonce[12],
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uint32_t counter )
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{
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/* Counter */
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ctx->state[12] = counter;
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/* Nonce */
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ctx->state[13] = MBEDTLS_GET_UINT32_LE( nonce, 0 );
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ctx->state[14] = MBEDTLS_GET_UINT32_LE( nonce, 4 );
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ctx->state[15] = MBEDTLS_GET_UINT32_LE( nonce, 8 );
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mbedtls_platform_zeroize( ctx->keystream8, sizeof( ctx->keystream8 ) );
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/* Initially, there's no keystream bytes available */
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ctx->keystream_bytes_used = CHACHA20_BLOCK_SIZE_BYTES;
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return( 0 );
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}
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int mbedtls_chacha20_update( mbedtls_chacha20_context *ctx,
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size_t size,
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const unsigned char *input,
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unsigned char *output )
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{
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size_t offset = 0U;
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/* Use leftover keystream bytes, if available */
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while( size > 0U && ctx->keystream_bytes_used < CHACHA20_BLOCK_SIZE_BYTES )
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{
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output[offset] = input[offset]
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^ ctx->keystream8[ctx->keystream_bytes_used];
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ctx->keystream_bytes_used++;
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offset++;
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size--;
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}
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/* Process full blocks */
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while( size >= CHACHA20_BLOCK_SIZE_BYTES )
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{
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/* Generate new keystream block and increment counter */
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chacha20_block( ctx->state, ctx->keystream8 );
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ctx->state[CHACHA20_CTR_INDEX]++;
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mbedtls_xor( output + offset, input + offset, ctx->keystream8, 64U );
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offset += CHACHA20_BLOCK_SIZE_BYTES;
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size -= CHACHA20_BLOCK_SIZE_BYTES;
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}
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/* Last (partial) block */
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if( size > 0U )
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{
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/* Generate new keystream block and increment counter */
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chacha20_block( ctx->state, ctx->keystream8 );
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ctx->state[CHACHA20_CTR_INDEX]++;
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mbedtls_xor( output + offset, input + offset, ctx->keystream8, size );
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ctx->keystream_bytes_used = size;
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}
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return( 0 );
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}
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int mbedtls_chacha20_crypt( const unsigned char key[32],
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const unsigned char nonce[12],
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uint32_t counter,
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size_t data_len,
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const unsigned char* input,
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unsigned char* output )
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{
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mbedtls_chacha20_context ctx;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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mbedtls_chacha20_init( &ctx );
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ret = mbedtls_chacha20_setkey( &ctx, key );
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if( ret != 0 )
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goto cleanup;
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ret = mbedtls_chacha20_starts( &ctx, nonce, counter );
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if( ret != 0 )
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goto cleanup;
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ret = mbedtls_chacha20_update( &ctx, data_len, input, output );
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cleanup:
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mbedtls_chacha20_free( &ctx );
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return( ret );
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}
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#endif /* !MBEDTLS_CHACHA20_ALT */
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#if defined(MBEDTLS_SELF_TEST)
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static const unsigned char test_keys[2][32] =
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{
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{
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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},
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{
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01
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}
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};
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static const unsigned char test_nonces[2][12] =
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{
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{
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00
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},
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{
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x02
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}
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};
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static const uint32_t test_counters[2] =
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{
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0U,
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1U
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};
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static const unsigned char test_input[2][375] =
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{
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{
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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},
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{
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0x41, 0x6e, 0x79, 0x20, 0x73, 0x75, 0x62, 0x6d,
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0x69, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x20, 0x74,
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0x6f, 0x20, 0x74, 0x68, 0x65, 0x20, 0x49, 0x45,
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0x54, 0x46, 0x20, 0x69, 0x6e, 0x74, 0x65, 0x6e,
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0x64, 0x65, 0x64, 0x20, 0x62, 0x79, 0x20, 0x74,
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0x68, 0x65, 0x20, 0x43, 0x6f, 0x6e, 0x74, 0x72,
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0x69, 0x62, 0x75, 0x74, 0x6f, 0x72, 0x20, 0x66,
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0x6f, 0x72, 0x20, 0x70, 0x75, 0x62, 0x6c, 0x69,
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0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x61,
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0x73, 0x20, 0x61, 0x6c, 0x6c, 0x20, 0x6f, 0x72,
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0x20, 0x70, 0x61, 0x72, 0x74, 0x20, 0x6f, 0x66,
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0x20, 0x61, 0x6e, 0x20, 0x49, 0x45, 0x54, 0x46,
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0x20, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65,
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0x74, 0x2d, 0x44, 0x72, 0x61, 0x66, 0x74, 0x20,
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0x6f, 0x72, 0x20, 0x52, 0x46, 0x43, 0x20, 0x61,
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0x6e, 0x64, 0x20, 0x61, 0x6e, 0x79, 0x20, 0x73,
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0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e, 0x74,
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0x20, 0x6d, 0x61, 0x64, 0x65, 0x20, 0x77, 0x69,
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0x74, 0x68, 0x69, 0x6e, 0x20, 0x74, 0x68, 0x65,
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0x20, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x78, 0x74,
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0x20, 0x6f, 0x66, 0x20, 0x61, 0x6e, 0x20, 0x49,
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|
0x45, 0x54, 0x46, 0x20, 0x61, 0x63, 0x74, 0x69,
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|
0x76, 0x69, 0x74, 0x79, 0x20, 0x69, 0x73, 0x20,
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|
0x63, 0x6f, 0x6e, 0x73, 0x69, 0x64, 0x65, 0x72,
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0x65, 0x64, 0x20, 0x61, 0x6e, 0x20, 0x22, 0x49,
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|
0x45, 0x54, 0x46, 0x20, 0x43, 0x6f, 0x6e, 0x74,
|
|
0x72, 0x69, 0x62, 0x75, 0x74, 0x69, 0x6f, 0x6e,
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|
0x22, 0x2e, 0x20, 0x53, 0x75, 0x63, 0x68, 0x20,
|
|
0x73, 0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e,
|
|
0x74, 0x73, 0x20, 0x69, 0x6e, 0x63, 0x6c, 0x75,
|
|
0x64, 0x65, 0x20, 0x6f, 0x72, 0x61, 0x6c, 0x20,
|
|
0x73, 0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e,
|
|
0x74, 0x73, 0x20, 0x69, 0x6e, 0x20, 0x49, 0x45,
|
|
0x54, 0x46, 0x20, 0x73, 0x65, 0x73, 0x73, 0x69,
|
|
0x6f, 0x6e, 0x73, 0x2c, 0x20, 0x61, 0x73, 0x20,
|
|
0x77, 0x65, 0x6c, 0x6c, 0x20, 0x61, 0x73, 0x20,
|
|
0x77, 0x72, 0x69, 0x74, 0x74, 0x65, 0x6e, 0x20,
|
|
0x61, 0x6e, 0x64, 0x20, 0x65, 0x6c, 0x65, 0x63,
|
|
0x74, 0x72, 0x6f, 0x6e, 0x69, 0x63, 0x20, 0x63,
|
|
0x6f, 0x6d, 0x6d, 0x75, 0x6e, 0x69, 0x63, 0x61,
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|
0x74, 0x69, 0x6f, 0x6e, 0x73, 0x20, 0x6d, 0x61,
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0x64, 0x65, 0x20, 0x61, 0x74, 0x20, 0x61, 0x6e,
|
|
0x79, 0x20, 0x74, 0x69, 0x6d, 0x65, 0x20, 0x6f,
|
|
0x72, 0x20, 0x70, 0x6c, 0x61, 0x63, 0x65, 0x2c,
|
|
0x20, 0x77, 0x68, 0x69, 0x63, 0x68, 0x20, 0x61,
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|
0x72, 0x65, 0x20, 0x61, 0x64, 0x64, 0x72, 0x65,
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0x73, 0x73, 0x65, 0x64, 0x20, 0x74, 0x6f
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}
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};
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static const unsigned char test_output[2][375] =
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{
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{
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0x76, 0xb8, 0xe0, 0xad, 0xa0, 0xf1, 0x3d, 0x90,
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0x40, 0x5d, 0x6a, 0xe5, 0x53, 0x86, 0xbd, 0x28,
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0xbd, 0xd2, 0x19, 0xb8, 0xa0, 0x8d, 0xed, 0x1a,
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0xa8, 0x36, 0xef, 0xcc, 0x8b, 0x77, 0x0d, 0xc7,
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0xda, 0x41, 0x59, 0x7c, 0x51, 0x57, 0x48, 0x8d,
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0x77, 0x24, 0xe0, 0x3f, 0xb8, 0xd8, 0x4a, 0x37,
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0x6a, 0x43, 0xb8, 0xf4, 0x15, 0x18, 0xa1, 0x1c,
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|
0xc3, 0x87, 0xb6, 0x69, 0xb2, 0xee, 0x65, 0x86
|
|
},
|
|
{
|
|
0xa3, 0xfb, 0xf0, 0x7d, 0xf3, 0xfa, 0x2f, 0xde,
|
|
0x4f, 0x37, 0x6c, 0xa2, 0x3e, 0x82, 0x73, 0x70,
|
|
0x41, 0x60, 0x5d, 0x9f, 0x4f, 0x4f, 0x57, 0xbd,
|
|
0x8c, 0xff, 0x2c, 0x1d, 0x4b, 0x79, 0x55, 0xec,
|
|
0x2a, 0x97, 0x94, 0x8b, 0xd3, 0x72, 0x29, 0x15,
|
|
0xc8, 0xf3, 0xd3, 0x37, 0xf7, 0xd3, 0x70, 0x05,
|
|
0x0e, 0x9e, 0x96, 0xd6, 0x47, 0xb7, 0xc3, 0x9f,
|
|
0x56, 0xe0, 0x31, 0xca, 0x5e, 0xb6, 0x25, 0x0d,
|
|
0x40, 0x42, 0xe0, 0x27, 0x85, 0xec, 0xec, 0xfa,
|
|
0x4b, 0x4b, 0xb5, 0xe8, 0xea, 0xd0, 0x44, 0x0e,
|
|
0x20, 0xb6, 0xe8, 0xdb, 0x09, 0xd8, 0x81, 0xa7,
|
|
0xc6, 0x13, 0x2f, 0x42, 0x0e, 0x52, 0x79, 0x50,
|
|
0x42, 0xbd, 0xfa, 0x77, 0x73, 0xd8, 0xa9, 0x05,
|
|
0x14, 0x47, 0xb3, 0x29, 0x1c, 0xe1, 0x41, 0x1c,
|
|
0x68, 0x04, 0x65, 0x55, 0x2a, 0xa6, 0xc4, 0x05,
|
|
0xb7, 0x76, 0x4d, 0x5e, 0x87, 0xbe, 0xa8, 0x5a,
|
|
0xd0, 0x0f, 0x84, 0x49, 0xed, 0x8f, 0x72, 0xd0,
|
|
0xd6, 0x62, 0xab, 0x05, 0x26, 0x91, 0xca, 0x66,
|
|
0x42, 0x4b, 0xc8, 0x6d, 0x2d, 0xf8, 0x0e, 0xa4,
|
|
0x1f, 0x43, 0xab, 0xf9, 0x37, 0xd3, 0x25, 0x9d,
|
|
0xc4, 0xb2, 0xd0, 0xdf, 0xb4, 0x8a, 0x6c, 0x91,
|
|
0x39, 0xdd, 0xd7, 0xf7, 0x69, 0x66, 0xe9, 0x28,
|
|
0xe6, 0x35, 0x55, 0x3b, 0xa7, 0x6c, 0x5c, 0x87,
|
|
0x9d, 0x7b, 0x35, 0xd4, 0x9e, 0xb2, 0xe6, 0x2b,
|
|
0x08, 0x71, 0xcd, 0xac, 0x63, 0x89, 0x39, 0xe2,
|
|
0x5e, 0x8a, 0x1e, 0x0e, 0xf9, 0xd5, 0x28, 0x0f,
|
|
0xa8, 0xca, 0x32, 0x8b, 0x35, 0x1c, 0x3c, 0x76,
|
|
0x59, 0x89, 0xcb, 0xcf, 0x3d, 0xaa, 0x8b, 0x6c,
|
|
0xcc, 0x3a, 0xaf, 0x9f, 0x39, 0x79, 0xc9, 0x2b,
|
|
0x37, 0x20, 0xfc, 0x88, 0xdc, 0x95, 0xed, 0x84,
|
|
0xa1, 0xbe, 0x05, 0x9c, 0x64, 0x99, 0xb9, 0xfd,
|
|
0xa2, 0x36, 0xe7, 0xe8, 0x18, 0xb0, 0x4b, 0x0b,
|
|
0xc3, 0x9c, 0x1e, 0x87, 0x6b, 0x19, 0x3b, 0xfe,
|
|
0x55, 0x69, 0x75, 0x3f, 0x88, 0x12, 0x8c, 0xc0,
|
|
0x8a, 0xaa, 0x9b, 0x63, 0xd1, 0xa1, 0x6f, 0x80,
|
|
0xef, 0x25, 0x54, 0xd7, 0x18, 0x9c, 0x41, 0x1f,
|
|
0x58, 0x69, 0xca, 0x52, 0xc5, 0xb8, 0x3f, 0xa3,
|
|
0x6f, 0xf2, 0x16, 0xb9, 0xc1, 0xd3, 0x00, 0x62,
|
|
0xbe, 0xbc, 0xfd, 0x2d, 0xc5, 0xbc, 0xe0, 0x91,
|
|
0x19, 0x34, 0xfd, 0xa7, 0x9a, 0x86, 0xf6, 0xe6,
|
|
0x98, 0xce, 0xd7, 0x59, 0xc3, 0xff, 0x9b, 0x64,
|
|
0x77, 0x33, 0x8f, 0x3d, 0xa4, 0xf9, 0xcd, 0x85,
|
|
0x14, 0xea, 0x99, 0x82, 0xcc, 0xaf, 0xb3, 0x41,
|
|
0xb2, 0x38, 0x4d, 0xd9, 0x02, 0xf3, 0xd1, 0xab,
|
|
0x7a, 0xc6, 0x1d, 0xd2, 0x9c, 0x6f, 0x21, 0xba,
|
|
0x5b, 0x86, 0x2f, 0x37, 0x30, 0xe3, 0x7c, 0xfd,
|
|
0xc4, 0xfd, 0x80, 0x6c, 0x22, 0xf2, 0x21
|
|
}
|
|
};
|
|
|
|
static const size_t test_lengths[2] =
|
|
{
|
|
64U,
|
|
375U
|
|
};
|
|
|
|
/* Make sure no other definition is already present. */
|
|
#undef ASSERT
|
|
|
|
#define ASSERT( cond, args ) \
|
|
do \
|
|
{ \
|
|
if( ! ( cond ) ) \
|
|
{ \
|
|
if( verbose != 0 ) \
|
|
mbedtls_printf args; \
|
|
\
|
|
return( -1 ); \
|
|
} \
|
|
} \
|
|
while( 0 )
|
|
|
|
int mbedtls_chacha20_self_test( int verbose )
|
|
{
|
|
unsigned char output[381];
|
|
unsigned i;
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
for( i = 0U; i < 2U; i++ )
|
|
{
|
|
if( verbose != 0 )
|
|
mbedtls_printf( " ChaCha20 test %u ", i );
|
|
|
|
ret = mbedtls_chacha20_crypt( test_keys[i],
|
|
test_nonces[i],
|
|
test_counters[i],
|
|
test_lengths[i],
|
|
test_input[i],
|
|
output );
|
|
|
|
ASSERT( 0 == ret, ( "error code: %i\n", ret ) );
|
|
|
|
ASSERT( 0 == memcmp( output, test_output[i], test_lengths[i] ),
|
|
( "failed (output)\n" ) );
|
|
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "passed\n" );
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "\n" );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#endif /* MBEDTLS_SELF_TEST */
|
|
|
|
#endif /* !MBEDTLS_CHACHA20_C */
|