cosmopolitan/third_party/mbedtls/md.c

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:4;tab-width:4;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright The Mbed TLS Contributors                                          │
│                                                                              │
│ 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.                                               │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/mem/mem.h"
#include "libc/stdio/stdio.h"
#include "third_party/mbedtls/common.h"
#include "third_party/mbedtls/error.h"
#include "third_party/mbedtls/md.h"
#include "third_party/mbedtls/md5.h"
#include "third_party/mbedtls/platform.h"
#include "third_party/mbedtls/sha1.h"
#include "third_party/mbedtls/sha256.h"
#include "third_party/mbedtls/sha512.h"
/* clang-format off */

asm(".ident\t\"\\n\\n\
Mbed TLS (Apache 2.0)\\n\
Copyright ARM Limited\\n\
Copyright Mbed TLS Contributors\"");
asm(".include \"libc/disclaimer.inc\"");

/**
 * \file md.c
 *
 * \brief Generic message digest wrapper for mbed TLS
 *
 * \author Adriaan de Jong <dejong@fox-it.com>
 *
 *  Copyright The Mbed TLS Contributors
 *  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 defined(MBEDTLS_MD_C)

#define CHECK(f)                 \
    do                           \
    {                            \
        if( ( ret = (f) ) )      \
            goto cleanup;        \
    } while( 0 )

/*
 * Reminder: update profiles in x509_crt.c when adding a new hash!
 */
static const uint8_t supported_digests[] = {
#if defined(MBEDTLS_SHA512_C)
        MBEDTLS_MD_SHA512,
#if !defined(MBEDTLS_SHA512_NO_SHA384)
        MBEDTLS_MD_SHA384,
#endif
#endif
#if defined(MBEDTLS_SHA256_C)
        MBEDTLS_MD_SHA256,
        MBEDTLS_MD_SHA224,
#endif
#if defined(MBEDTLS_SHA1_C)
        MBEDTLS_MD_SHA1,
#endif
#if defined(MBEDTLS_MD5_C)
        MBEDTLS_MD_MD5,
#endif
#if defined(MBEDTLS_MD4_C)
        MBEDTLS_MD_MD4,
#endif
#if defined(MBEDTLS_MD2_C)
        MBEDTLS_MD_MD2,
#endif
        MBEDTLS_MD_NONE
};

const uint8_t *mbedtls_md_list( void )
{
    return( supported_digests );
}

const mbedtls_md_info_t *mbedtls_md_info_from_string( const char *md_name )
{
    if( NULL == md_name )
        return( NULL );
    /* Get the appropriate digest information */
#if defined(MBEDTLS_MD2_C)
    if( !strcmp( "MD2", md_name ) )
        return mbedtls_md_info_from_type( MBEDTLS_MD_MD2 );
#endif
#if defined(MBEDTLS_MD4_C)
    if( !strcmp( "MD4", md_name ) )
        return mbedtls_md_info_from_type( MBEDTLS_MD_MD4 );
#endif
#if defined(MBEDTLS_MD5_C)
    if( !strcmp( "MD5", md_name ) )
        return mbedtls_md_info_from_type( MBEDTLS_MD_MD5 );
#endif
#if defined(MBEDTLS_SHA1_C)
    if( !strcmp( "SHA1", md_name ) || !strcmp( "SHA", md_name ) )
        return mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
#endif
#if defined(MBEDTLS_SHA256_C)
    if( !strcmp( "SHA224", md_name ) )
        return mbedtls_md_info_from_type( MBEDTLS_MD_SHA224 );
    if( !strcmp( "SHA256", md_name ) )
        return mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 );
#endif
#if defined(MBEDTLS_SHA512_C)
#if !defined(MBEDTLS_SHA512_NO_SHA384)
    if( !strcmp( "SHA384", md_name ) )
        return mbedtls_md_info_from_type( MBEDTLS_MD_SHA384 );
#endif
    if( !strcmp( "SHA512", md_name ) )
        return mbedtls_md_info_from_type( MBEDTLS_MD_SHA512 );
#endif
    return( NULL );
}

const mbedtls_md_info_t *mbedtls_md_info_from_type( mbedtls_md_type_t md_type )
{
    switch( md_type )
    {
#if defined(MBEDTLS_MD2_C)
        case MBEDTLS_MD_MD2:
            return( &mbedtls_md2_info );
#endif
#if defined(MBEDTLS_MD4_C)
        case MBEDTLS_MD_MD4:
            return( &mbedtls_md4_info );
#endif
#if defined(MBEDTLS_MD5_C)
        case MBEDTLS_MD_MD5:
            return( &mbedtls_md5_info );
#endif
#if defined(MBEDTLS_SHA1_C)
        case MBEDTLS_MD_SHA1:
            return( &mbedtls_sha1_info );
#endif
#if defined(MBEDTLS_SHA256_C)
        case MBEDTLS_MD_SHA224:
            return( &mbedtls_sha224_info );
        case MBEDTLS_MD_SHA256:
            return( &mbedtls_sha256_info );
#endif
#if defined(MBEDTLS_SHA512_C)
#if !defined(MBEDTLS_SHA512_NO_SHA384)
        case MBEDTLS_MD_SHA384:
            return( &mbedtls_sha384_info );
#endif
        case MBEDTLS_MD_SHA512:
            return( &mbedtls_sha512_info );
#endif
        default:
            return( NULL );
    }
}

static int16_t GetMdContextSize(mbedtls_md_type_t t)
{
    switch( t )
    {
#if defined(MBEDTLS_MD2_C)
        case MBEDTLS_MD_MD2:
            return sizeof(mbedtls_md2_context);
#endif
#if defined(MBEDTLS_MD4_C)
        case MBEDTLS_MD_MD4:
            return sizeof(mbedtls_md4_context);
#endif
#if defined(MBEDTLS_MD5_C)
        case MBEDTLS_MD_MD5:
            return sizeof(mbedtls_md5_context);
#endif
#if defined(MBEDTLS_SHA1_C)
        case MBEDTLS_MD_SHA1:
            return sizeof(mbedtls_sha1_context);
#endif
#if defined(MBEDTLS_SHA256_C)
        case MBEDTLS_MD_SHA224:
        case MBEDTLS_MD_SHA256:
            return sizeof(mbedtls_sha256_context);
#endif
#if defined(MBEDTLS_SHA512_C)
#if !defined(MBEDTLS_SHA512_NO_SHA384)
        case MBEDTLS_MD_SHA384:
#endif
        case MBEDTLS_MD_SHA512:
            return sizeof(mbedtls_sha512_context);
#endif
        default:
            return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
    }
}

void mbedtls_md_init( mbedtls_md_context_t *ctx )
{
    mbedtls_platform_zeroize( ctx, sizeof( mbedtls_md_context_t ) );
}

void mbedtls_md_free( mbedtls_md_context_t *ctx )
{
    int16_t csize;
    if( !ctx || !ctx->md_info )
        return;
    if( ctx->md_ctx )
    {
        if ( ( csize = GetMdContextSize( ctx->md_info->type ) ) > 0 )
            mbedtls_platform_zeroize( ctx->md_ctx, csize );
        mbedtls_free( ctx->md_ctx );
    }
    if( ctx->hmac_ctx )
    {
        mbedtls_platform_zeroize( ctx->hmac_ctx,
                                  2 * ctx->md_info->block_size );
        mbedtls_free( ctx->hmac_ctx );
    }
    mbedtls_platform_zeroize( ctx, sizeof( mbedtls_md_context_t ) );
}

int mbedtls_md_clone( mbedtls_md_context_t *dst,
                      const mbedtls_md_context_t *src )
{
    int16_t csize;
    if( !dst || !dst->md_info ||
        !src || !src->md_info ||
        dst->md_info != src->md_info ||
        ( csize = GetMdContextSize( src->md_info->type ) ) < 0)
    {
        return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
    }
    memcpy( dst->md_ctx, src->md_ctx, csize );
    return( 0 );
}

#define ALLOC( type )                                                   \
    do {                                                                \
        ctx->md_ctx = mbedtls_calloc( 1, sizeof( mbedtls_##type##_context ) ); \
        if( !ctx->md_ctx )                                       \
            return( MBEDTLS_ERR_MD_ALLOC_FAILED );                      \
    }                                                                   \
    while( 0 )

int mbedtls_md_setup( mbedtls_md_context_t *ctx, const mbedtls_md_info_t *md_info, int hmac )
{
    int16_t csize;
    if( !md_info || !ctx )
        return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
    ctx->md_info = md_info;
    ctx->md_ctx = NULL;
    ctx->hmac_ctx = NULL;
    if ((csize = GetMdContextSize(md_info->type)) < 0) 
        return( csize );
    if( !( ctx->md_ctx = mbedtls_calloc( 1, csize ) ) )
        return( MBEDTLS_ERR_MD_ALLOC_FAILED );
    if( hmac )
    {
        ctx->hmac_ctx = mbedtls_calloc( 2, md_info->block_size );
        if( !ctx->hmac_ctx )
        {
            mbedtls_md_free( ctx );
            return( MBEDTLS_ERR_MD_ALLOC_FAILED );
        }
    }
    return( 0 );
}

int mbedtls_md_file( const mbedtls_md_info_t *md_info, const char *path, unsigned char *output )
{
    int ret = MBEDTLS_ERR_THIS_CORRUPTION;
    FILE *f;
    size_t n;
    mbedtls_md_context_t ctx;
    unsigned char buf[1024];
    if( !md_info )
        return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
    if( !( f = fopen( path, "rb" ) ) )
        return( MBEDTLS_ERR_MD_FILE_IO_ERROR );
    mbedtls_md_init( &ctx );
    CHECK( mbedtls_md_setup( &ctx, md_info, 0 ) );
    CHECK( mbedtls_md_starts( &ctx ) );
    while( ( n = fread( buf, 1, sizeof( buf ), f ) ) > 0 )
        CHECK( mbedtls_md_update( &ctx, buf, n ) );
    if( ferror( f ) )
        ret = MBEDTLS_ERR_MD_FILE_IO_ERROR;
    else
        ret = mbedtls_md_finish( &ctx, output );
cleanup:
    mbedtls_platform_zeroize( buf, sizeof( buf ) );
    mbedtls_md_free( &ctx );
    fclose( f );
    return( ret );
}

int mbedtls_md_hmac_starts( mbedtls_md_context_t *ctx, const unsigned char *key, size_t keylen )
{
    int ret = MBEDTLS_ERR_THIS_CORRUPTION;
    unsigned char sum[MBEDTLS_MD_MAX_SIZE];
    unsigned char *ipad, *opad;
    size_t i;
    if( !ctx || !ctx->md_info || !ctx->hmac_ctx )
        return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
    if( keylen > (size_t) ctx->md_info->block_size )
    {
        CHECK( mbedtls_md_starts( ctx ) );
        CHECK( mbedtls_md_update( ctx, key, keylen ) );
        CHECK( mbedtls_md_finish( ctx, sum ) );
        keylen = ctx->md_info->size;
        key = sum;
    }
    ipad = (unsigned char *) ctx->hmac_ctx;
    opad = (unsigned char *) ctx->hmac_ctx + ctx->md_info->block_size;
    memset( ipad, 0x36, ctx->md_info->block_size );
    memset( opad, 0x5C, ctx->md_info->block_size );
    for( i = 0; i < keylen; i++ )
    {
        ipad[i] = (unsigned char)( ipad[i] ^ key[i] );
        opad[i] = (unsigned char)( opad[i] ^ key[i] );
    }
    CHECK( mbedtls_md_starts( ctx ) );
    CHECK( mbedtls_md_update( ctx, ipad, ctx->md_info->block_size ) );
cleanup:
    mbedtls_platform_zeroize( sum, sizeof( sum ) );
    return( ret );
}

int mbedtls_md_hmac_finish( mbedtls_md_context_t *ctx, unsigned char *output )
{
    int ret = MBEDTLS_ERR_THIS_CORRUPTION;
    unsigned char tmp[MBEDTLS_MD_MAX_SIZE];
    unsigned char *opad;
    if( !ctx || !ctx->md_info || !ctx->hmac_ctx )
        return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
    opad = (unsigned char *) ctx->hmac_ctx + ctx->md_info->block_size;
    CHECK( mbedtls_md_finish( ctx, tmp ) );
    CHECK( mbedtls_md_starts( ctx ) );
    CHECK( mbedtls_md_update( ctx, opad, ctx->md_info->block_size ) );
    CHECK( mbedtls_md_update( ctx, tmp, ctx->md_info->size ) );
    return( mbedtls_md_finish( ctx, output ) );
cleanup:
    return( ret );
}

int mbedtls_md_hmac_reset( mbedtls_md_context_t *ctx )
{
    int ret = MBEDTLS_ERR_THIS_CORRUPTION;
    unsigned char *ipad;
    if( !ctx || !ctx->md_info || !ctx->hmac_ctx )
        return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
    ipad = (unsigned char *) ctx->hmac_ctx;
    if( ( ret = mbedtls_md_starts( ctx ) ) )
        return( ret );
    return( mbedtls_md_update( ctx, ipad, ctx->md_info->block_size ) );
}

int mbedtls_md_hmac( const mbedtls_md_info_t *md_info,
                     const unsigned char *key, size_t keylen,
                     const unsigned char *input, size_t ilen,
                     unsigned char *output )
{
    mbedtls_md_context_t ctx;
    int ret = MBEDTLS_ERR_THIS_CORRUPTION;
    if( !md_info )
        return( MBEDTLS_ERR_MD_BAD_INPUT_DATA );
    mbedtls_md_init( &ctx );
    CHECK( mbedtls_md_setup( &ctx, md_info, 1 ) );
    CHECK( mbedtls_md_hmac_starts( &ctx, key, keylen ) );
    CHECK( mbedtls_md_hmac_update( &ctx, input, ilen ) );
    CHECK( mbedtls_md_hmac_finish( &ctx, output ) );
cleanup:
    mbedtls_md_free( &ctx );
    return( ret );
}

#if defined(MBEDTLS_MD2_C)
const mbedtls_md_info_t mbedtls_md2_info = {
    "MD2",
    MBEDTLS_MD_MD2,
    16,
    16,
};
#endif

#if defined(MBEDTLS_MD4_C)
const mbedtls_md_info_t mbedtls_md4_info = {
    "MD4",
    MBEDTLS_MD_MD4,
    16,
    64,
};
#endif

#endif /* MBEDTLS_MD_C */