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pandemonium_engine/thirdparty/mbedtls/library/chacha20.c

533 lines
18 KiB
C
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/**
* \file chacha20.c
*
* \brief ChaCha20 cipher.
*
* \author Daniel King <damaki.gh@gmail.com>
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "common.h"
#if defined(MBEDTLS_CHACHA20_C)
#include "mbedtls/chacha20.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include <stddef.h>
#include <string.h>
#include "mbedtls/platform.h"
#if !defined(MBEDTLS_CHACHA20_ALT)
/* Parameter validation macros */
#define CHACHA20_VALIDATE_RET(cond) \
MBEDTLS_INTERNAL_VALIDATE_RET(cond, MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA)
#define CHACHA20_VALIDATE(cond) \
MBEDTLS_INTERNAL_VALIDATE(cond)
#define ROTL32(value, amount) \
((uint32_t) ((value) << (amount)) | ((value) >> (32 - (amount))))
#define CHACHA20_CTR_INDEX (12U)
#define CHACHA20_BLOCK_SIZE_BYTES (4U * 16U)
/**
* \brief ChaCha20 quarter round operation.
*
* The quarter round is defined as follows (from RFC 7539):
* 1. a += b; d ^= a; d <<<= 16;
* 2. c += d; b ^= c; b <<<= 12;
* 3. a += b; d ^= a; d <<<= 8;
* 4. c += d; b ^= c; b <<<= 7;
*
* \param state ChaCha20 state to modify.
* \param a The index of 'a' in the state.
* \param b The index of 'b' in the state.
* \param c The index of 'c' in the state.
* \param d The index of 'd' in the state.
*/
static inline void chacha20_quarter_round(uint32_t state[16],
size_t a,
size_t b,
size_t c,
size_t d)
{
/* a += b; d ^= a; d <<<= 16; */
state[a] += state[b];
state[d] ^= state[a];
state[d] = ROTL32(state[d], 16);
/* c += d; b ^= c; b <<<= 12 */
state[c] += state[d];
state[b] ^= state[c];
state[b] = ROTL32(state[b], 12);
/* a += b; d ^= a; d <<<= 8; */
state[a] += state[b];
state[d] ^= state[a];
state[d] = ROTL32(state[d], 8);
/* c += d; b ^= c; b <<<= 7; */
state[c] += state[d];
state[b] ^= state[c];
state[b] = ROTL32(state[b], 7);
}
/**
* \brief Perform the ChaCha20 inner block operation.
*
* This function performs two rounds: the column round and the
* diagonal round.
*
* \param state The ChaCha20 state to update.
*/
static void chacha20_inner_block(uint32_t state[16])
{
chacha20_quarter_round(state, 0, 4, 8, 12);
chacha20_quarter_round(state, 1, 5, 9, 13);
chacha20_quarter_round(state, 2, 6, 10, 14);
chacha20_quarter_round(state, 3, 7, 11, 15);
chacha20_quarter_round(state, 0, 5, 10, 15);
chacha20_quarter_round(state, 1, 6, 11, 12);
chacha20_quarter_round(state, 2, 7, 8, 13);
chacha20_quarter_round(state, 3, 4, 9, 14);
}
/**
* \brief Generates a keystream block.
*
* \param initial_state The initial ChaCha20 state (key, nonce, counter).
* \param keystream Generated keystream bytes are written to this buffer.
*/
static void chacha20_block(const uint32_t initial_state[16],
unsigned char keystream[64])
{
uint32_t working_state[16];
size_t i;
memcpy(working_state,
initial_state,
CHACHA20_BLOCK_SIZE_BYTES);
for (i = 0U; i < 10U; i++) {
chacha20_inner_block(working_state);
}
working_state[0] += initial_state[0];
working_state[1] += initial_state[1];
working_state[2] += initial_state[2];
working_state[3] += initial_state[3];
working_state[4] += initial_state[4];
working_state[5] += initial_state[5];
working_state[6] += initial_state[6];
working_state[7] += initial_state[7];
working_state[8] += initial_state[8];
working_state[9] += initial_state[9];
working_state[10] += initial_state[10];
working_state[11] += initial_state[11];
working_state[12] += initial_state[12];
working_state[13] += initial_state[13];
working_state[14] += initial_state[14];
working_state[15] += initial_state[15];
for (i = 0U; i < 16; i++) {
size_t offset = i * 4U;
MBEDTLS_PUT_UINT32_LE(working_state[i], keystream, offset);
}
mbedtls_platform_zeroize(working_state, sizeof(working_state));
}
void mbedtls_chacha20_init(mbedtls_chacha20_context *ctx)
{
CHACHA20_VALIDATE(ctx != NULL);
mbedtls_platform_zeroize(ctx->state, sizeof(ctx->state));
mbedtls_platform_zeroize(ctx->keystream8, sizeof(ctx->keystream8));
/* Initially, there's no keystream bytes available */
ctx->keystream_bytes_used = CHACHA20_BLOCK_SIZE_BYTES;
}
void mbedtls_chacha20_free(mbedtls_chacha20_context *ctx)
{
if (ctx != NULL) {
mbedtls_platform_zeroize(ctx, sizeof(mbedtls_chacha20_context));
}
}
int mbedtls_chacha20_setkey(mbedtls_chacha20_context *ctx,
const unsigned char key[32])
{
CHACHA20_VALIDATE_RET(ctx != NULL);
CHACHA20_VALIDATE_RET(key != NULL);
/* ChaCha20 constants - the string "expand 32-byte k" */
ctx->state[0] = 0x61707865;
ctx->state[1] = 0x3320646e;
ctx->state[2] = 0x79622d32;
ctx->state[3] = 0x6b206574;
/* Set key */
ctx->state[4] = MBEDTLS_GET_UINT32_LE(key, 0);
ctx->state[5] = MBEDTLS_GET_UINT32_LE(key, 4);
ctx->state[6] = MBEDTLS_GET_UINT32_LE(key, 8);
ctx->state[7] = MBEDTLS_GET_UINT32_LE(key, 12);
ctx->state[8] = MBEDTLS_GET_UINT32_LE(key, 16);
ctx->state[9] = MBEDTLS_GET_UINT32_LE(key, 20);
ctx->state[10] = MBEDTLS_GET_UINT32_LE(key, 24);
ctx->state[11] = MBEDTLS_GET_UINT32_LE(key, 28);
return 0;
}
int mbedtls_chacha20_starts(mbedtls_chacha20_context *ctx,
const unsigned char nonce[12],
uint32_t counter)
{
CHACHA20_VALIDATE_RET(ctx != NULL);
CHACHA20_VALIDATE_RET(nonce != NULL);
/* Counter */
ctx->state[12] = counter;
/* Nonce */
ctx->state[13] = MBEDTLS_GET_UINT32_LE(nonce, 0);
ctx->state[14] = MBEDTLS_GET_UINT32_LE(nonce, 4);
ctx->state[15] = MBEDTLS_GET_UINT32_LE(nonce, 8);
mbedtls_platform_zeroize(ctx->keystream8, sizeof(ctx->keystream8));
/* Initially, there's no keystream bytes available */
ctx->keystream_bytes_used = CHACHA20_BLOCK_SIZE_BYTES;
return 0;
}
int mbedtls_chacha20_update(mbedtls_chacha20_context *ctx,
size_t size,
const unsigned char *input,
unsigned char *output)
{
size_t offset = 0U;
size_t i;
CHACHA20_VALIDATE_RET(ctx != NULL);
CHACHA20_VALIDATE_RET(size == 0 || input != NULL);
CHACHA20_VALIDATE_RET(size == 0 || output != NULL);
/* Use leftover keystream bytes, if available */
while (size > 0U && ctx->keystream_bytes_used < CHACHA20_BLOCK_SIZE_BYTES) {
output[offset] = input[offset]
^ ctx->keystream8[ctx->keystream_bytes_used];
ctx->keystream_bytes_used++;
offset++;
size--;
}
/* Process full blocks */
while (size >= CHACHA20_BLOCK_SIZE_BYTES) {
/* Generate new keystream block and increment counter */
chacha20_block(ctx->state, ctx->keystream8);
ctx->state[CHACHA20_CTR_INDEX]++;
for (i = 0U; i < 64U; i += 8U) {
output[offset + i] = input[offset + i] ^ ctx->keystream8[i];
output[offset + i+1] = input[offset + i+1] ^ ctx->keystream8[i+1];
output[offset + i+2] = input[offset + i+2] ^ ctx->keystream8[i+2];
output[offset + i+3] = input[offset + i+3] ^ ctx->keystream8[i+3];
output[offset + i+4] = input[offset + i+4] ^ ctx->keystream8[i+4];
output[offset + i+5] = input[offset + i+5] ^ ctx->keystream8[i+5];
output[offset + i+6] = input[offset + i+6] ^ ctx->keystream8[i+6];
output[offset + i+7] = input[offset + i+7] ^ ctx->keystream8[i+7];
}
offset += CHACHA20_BLOCK_SIZE_BYTES;
size -= CHACHA20_BLOCK_SIZE_BYTES;
}
/* Last (partial) block */
if (size > 0U) {
/* Generate new keystream block and increment counter */
chacha20_block(ctx->state, ctx->keystream8);
ctx->state[CHACHA20_CTR_INDEX]++;
for (i = 0U; i < size; i++) {
output[offset + i] = input[offset + i] ^ ctx->keystream8[i];
}
ctx->keystream_bytes_used = size;
}
return 0;
}
int mbedtls_chacha20_crypt(const unsigned char key[32],
const unsigned char nonce[12],
uint32_t counter,
size_t data_len,
const unsigned char *input,
unsigned char *output)
{
mbedtls_chacha20_context ctx;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
CHACHA20_VALIDATE_RET(key != NULL);
CHACHA20_VALIDATE_RET(nonce != NULL);
CHACHA20_VALIDATE_RET(data_len == 0 || input != NULL);
CHACHA20_VALIDATE_RET(data_len == 0 || output != NULL);
mbedtls_chacha20_init(&ctx);
ret = mbedtls_chacha20_setkey(&ctx, key);
if (ret != 0) {
goto cleanup;
}
ret = mbedtls_chacha20_starts(&ctx, nonce, counter);
if (ret != 0) {
goto cleanup;
}
ret = mbedtls_chacha20_update(&ctx, data_len, input, output);
cleanup:
mbedtls_chacha20_free(&ctx);
return ret;
}
#endif /* !MBEDTLS_CHACHA20_ALT */
#if defined(MBEDTLS_SELF_TEST)
static const unsigned char test_keys[2][32] =
{
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
},
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01
}
};
static const unsigned char test_nonces[2][12] =
{
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
},
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x02
}
};
static const uint32_t test_counters[2] =
{
0U,
1U
};
static const unsigned char test_input[2][375] =
{
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
},
{
0x41, 0x6e, 0x79, 0x20, 0x73, 0x75, 0x62, 0x6d,
0x69, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x20, 0x74,
0x6f, 0x20, 0x74, 0x68, 0x65, 0x20, 0x49, 0x45,
0x54, 0x46, 0x20, 0x69, 0x6e, 0x74, 0x65, 0x6e,
0x64, 0x65, 0x64, 0x20, 0x62, 0x79, 0x20, 0x74,
0x68, 0x65, 0x20, 0x43, 0x6f, 0x6e, 0x74, 0x72,
0x69, 0x62, 0x75, 0x74, 0x6f, 0x72, 0x20, 0x66,
0x6f, 0x72, 0x20, 0x70, 0x75, 0x62, 0x6c, 0x69,
0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x61,
0x73, 0x20, 0x61, 0x6c, 0x6c, 0x20, 0x6f, 0x72,
0x20, 0x70, 0x61, 0x72, 0x74, 0x20, 0x6f, 0x66,
0x20, 0x61, 0x6e, 0x20, 0x49, 0x45, 0x54, 0x46,
0x20, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65,
0x74, 0x2d, 0x44, 0x72, 0x61, 0x66, 0x74, 0x20,
0x6f, 0x72, 0x20, 0x52, 0x46, 0x43, 0x20, 0x61,
0x6e, 0x64, 0x20, 0x61, 0x6e, 0x79, 0x20, 0x73,
0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e, 0x74,
0x20, 0x6d, 0x61, 0x64, 0x65, 0x20, 0x77, 0x69,
0x74, 0x68, 0x69, 0x6e, 0x20, 0x74, 0x68, 0x65,
0x20, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x78, 0x74,
0x20, 0x6f, 0x66, 0x20, 0x61, 0x6e, 0x20, 0x49,
0x45, 0x54, 0x46, 0x20, 0x61, 0x63, 0x74, 0x69,
0x76, 0x69, 0x74, 0x79, 0x20, 0x69, 0x73, 0x20,
0x63, 0x6f, 0x6e, 0x73, 0x69, 0x64, 0x65, 0x72,
0x65, 0x64, 0x20, 0x61, 0x6e, 0x20, 0x22, 0x49,
0x45, 0x54, 0x46, 0x20, 0x43, 0x6f, 0x6e, 0x74,
0x72, 0x69, 0x62, 0x75, 0x74, 0x69, 0x6f, 0x6e,
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,
0x74, 0x69, 0x6f, 0x6e, 0x73, 0x20, 0x6d, 0x61,
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,
0x72, 0x65, 0x20, 0x61, 0x64, 0x64, 0x72, 0x65,
0x73, 0x73, 0x65, 0x64, 0x20, 0x74, 0x6f
}
};
static const unsigned char test_output[2][375] =
{
{
0x76, 0xb8, 0xe0, 0xad, 0xa0, 0xf1, 0x3d, 0x90,
0x40, 0x5d, 0x6a, 0xe5, 0x53, 0x86, 0xbd, 0x28,
0xbd, 0xd2, 0x19, 0xb8, 0xa0, 0x8d, 0xed, 0x1a,
0xa8, 0x36, 0xef, 0xcc, 0x8b, 0x77, 0x0d, 0xc7,
0xda, 0x41, 0x59, 0x7c, 0x51, 0x57, 0x48, 0x8d,
0x77, 0x24, 0xe0, 0x3f, 0xb8, 0xd8, 0x4a, 0x37,
0x6a, 0x43, 0xb8, 0xf4, 0x15, 0x18, 0xa1, 0x1c,
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 */
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