Diff: features/mbedtls/mbed-crypto/src/chacha20.c

Revision:

0:5b88d5760320

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/features/mbedtls/mbed-crypto/src/chacha20.c	Tue Dec 17 23:23:45 2019 +0000
@@ -0,0 +1,570 @@
+/**
+ * \file chacha20.c
+ *
+ * \brief ChaCha20 cipher.
+ *
+ * \author Daniel King <damaki.gh@gmail.com>
+ *
+ *  Copyright (C) 2006-2016, 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.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_CHACHA20_C)
+
+#include "mbedtls/chacha20.h"
+#include "mbedtls/platform_util.h"
+
+#include <stddef.h>
+#include <string.h>
+
+#if defined(MBEDTLS_SELF_TEST)
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#define mbedtls_printf printf
+#endif /* MBEDTLS_PLATFORM_C */
+#endif /* MBEDTLS_SELF_TEST */
+
+#if !defined(MBEDTLS_CHACHA20_ALT)
+
+#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
+    !defined(inline) && !defined(__cplusplus)
+#define inline __inline
+#endif
+
+/* 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 BYTES_TO_U32_LE( data, offset )                           \
+    ( (uint32_t) (data)[offset]                                   \
+      | (uint32_t) ( (uint32_t) (data)[( offset ) + 1] << 8 )     \
+      | (uint32_t) ( (uint32_t) (data)[( offset ) + 2] << 16 )    \
+      | (uint32_t) ( (uint32_t) (data)[( offset ) + 3] << 24 )    \
+    )
+
+#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;
+
+        keystream[offset     ] = (unsigned char)( working_state[i]       );
+        keystream[offset + 1U] = (unsigned char)( working_state[i] >>  8 );
+        keystream[offset + 2U] = (unsigned char)( working_state[i] >> 16 );
+        keystream[offset + 3U] = (unsigned char)( working_state[i] >> 24 );
+    }
+
+    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]  = BYTES_TO_U32_LE( key, 0 );
+    ctx->state[5]  = BYTES_TO_U32_LE( key, 4 );
+    ctx->state[6]  = BYTES_TO_U32_LE( key, 8 );
+    ctx->state[7]  = BYTES_TO_U32_LE( key, 12 );
+    ctx->state[8]  = BYTES_TO_U32_LE( key, 16 );
+    ctx->state[9]  = BYTES_TO_U32_LE( key, 20 );
+    ctx->state[10] = BYTES_TO_U32_LE( key, 24 );
+    ctx->state[11] = BYTES_TO_U32_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] = BYTES_TO_U32_LE( nonce, 0 );
+    ctx->state[14] = BYTES_TO_U32_LE( nonce, 4 );
+    ctx->state[15] = BYTES_TO_U32_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;
+
+    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
+};
+
+#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;
+
+    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 */