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Diffstat (limited to 'lib/mbedtls-2.27.0/programs/psa/key_ladder_demo.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/programs/psa/key_ladder_demo.c | 707 |
1 files changed, 707 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/programs/psa/key_ladder_demo.c b/lib/mbedtls-2.27.0/programs/psa/key_ladder_demo.c new file mode 100644 index 0000000..5d64349 --- /dev/null +++ b/lib/mbedtls-2.27.0/programs/psa/key_ladder_demo.c @@ -0,0 +1,707 @@ +/** + * PSA API key derivation demonstration + * + * This program calculates a key ladder: a chain of secret material, each + * derived from the previous one in a deterministic way based on a label. + * Two keys are identical if and only if they are derived from the same key + * using the same label. + * + * The initial key is called the master key. The master key is normally + * randomly generated, but it could itself be derived from another key. + * + * This program derives a series of keys called intermediate keys. + * The first intermediate key is derived from the master key using the + * first label passed on the command line. Each subsequent intermediate + * key is derived from the previous one using the next label passed + * on the command line. + * + * This program has four modes of operation: + * + * - "generate": generate a random master key. + * - "wrap": derive a wrapping key from the last intermediate key, + * and use that key to encrypt-and-authenticate some data. + * - "unwrap": derive a wrapping key from the last intermediate key, + * and use that key to decrypt-and-authenticate some + * ciphertext created by wrap mode. + * - "save": save the last intermediate key so that it can be reused as + * the master key in another run of the program. + * + * See the usage() output for the command line usage. See the file + * `key_ladder_demo.sh` for an example run. + */ + +/* + * 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. + */ + +/* First include Mbed TLS headers to get the Mbed TLS configuration and + * platform definitions that we'll use in this program. Also include + * standard C headers for functions we'll use here. */ +#if !defined(MBEDTLS_CONFIG_FILE) +#include "mbedtls/config.h" +#else +#include MBEDTLS_CONFIG_FILE +#endif + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> + +#include "mbedtls/platform_util.h" // for mbedtls_platform_zeroize + +#include <psa/crypto.h> + +/* If the build options we need are not enabled, compile a placeholder. */ +#if !defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_MD_C) || \ + !defined(MBEDTLS_AES_C) || !defined(MBEDTLS_CCM_C) || \ + !defined(MBEDTLS_PSA_CRYPTO_C) || !defined(MBEDTLS_FS_IO) || \ + defined(MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER) +int main( void ) +{ + printf( "MBEDTLS_SHA256_C and/or MBEDTLS_MD_C and/or " + "MBEDTLS_AES_C and/or MBEDTLS_CCM_C and/or " + "MBEDTLS_PSA_CRYPTO_C and/or MBEDTLS_FS_IO " + "not defined and/or MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER " + "defined.\n" ); + return( 0 ); +} +#else + +/* The real program starts here. */ + +/* Run a system function and bail out if it fails. */ +#define SYS_CHECK( expr ) \ + do \ + { \ + if( ! ( expr ) ) \ + { \ + perror( #expr ); \ + status = DEMO_ERROR; \ + goto exit; \ + } \ + } \ + while( 0 ) + +/* Run a PSA function and bail out if it fails. */ +#define PSA_CHECK( expr ) \ + do \ + { \ + status = ( expr ); \ + if( status != PSA_SUCCESS ) \ + { \ + printf( "Error %d at line %d: %s\n", \ + (int) status, \ + __LINE__, \ + #expr ); \ + goto exit; \ + } \ + } \ + while( 0 ) + +/* To report operational errors in this program, use an error code that is + * different from every PSA error code. */ +#define DEMO_ERROR 120 + +/* The maximum supported key ladder depth. */ +#define MAX_LADDER_DEPTH 10 + +/* Salt to use when deriving an intermediate key. */ +#define DERIVE_KEY_SALT ( (uint8_t *) "key_ladder_demo.derive" ) +#define DERIVE_KEY_SALT_LENGTH ( strlen( (const char*) DERIVE_KEY_SALT ) ) + +/* Salt to use when deriving a wrapping key. */ +#define WRAPPING_KEY_SALT ( (uint8_t *) "key_ladder_demo.wrap" ) +#define WRAPPING_KEY_SALT_LENGTH ( strlen( (const char*) WRAPPING_KEY_SALT ) ) + +/* Size of the key derivation keys (applies both to the master key and + * to intermediate keys). */ +#define KEY_SIZE_BYTES 40 + +/* Algorithm for key derivation. */ +#define KDF_ALG PSA_ALG_HKDF( PSA_ALG_SHA_256 ) + +/* Type and size of the key used to wrap data. */ +#define WRAPPING_KEY_TYPE PSA_KEY_TYPE_AES +#define WRAPPING_KEY_BITS 128 + +/* Cipher mode used to wrap data. */ +#define WRAPPING_ALG PSA_ALG_CCM + +/* Nonce size used to wrap data. */ +#define WRAPPING_IV_SIZE 13 + +/* Header used in files containing wrapped data. We'll save this header + * directly without worrying about data representation issues such as + * integer sizes and endianness, because the data is meant to be read + * back by the same program on the same machine. */ +#define WRAPPED_DATA_MAGIC "key_ladder_demo" // including trailing null byte +#define WRAPPED_DATA_MAGIC_LENGTH ( sizeof( WRAPPED_DATA_MAGIC ) ) +typedef struct +{ + char magic[WRAPPED_DATA_MAGIC_LENGTH]; + size_t ad_size; /* Size of the additional data, which is this header. */ + size_t payload_size; /* Size of the encrypted data. */ + /* Store the IV inside the additional data. It's convenient. */ + uint8_t iv[WRAPPING_IV_SIZE]; +} wrapped_data_header_t; + +/* The modes that this program can operate in (see usage). */ +enum program_mode +{ + MODE_GENERATE, + MODE_SAVE, + MODE_UNWRAP, + MODE_WRAP +}; + +/* Save a key to a file. In the real world, you may want to export a derived + * key sometimes, to share it with another party. */ +static psa_status_t save_key( psa_key_id_t key, + const char *output_file_name ) +{ + psa_status_t status = PSA_SUCCESS; + uint8_t key_data[KEY_SIZE_BYTES]; + size_t key_size; + FILE *key_file = NULL; + + PSA_CHECK( psa_export_key( key, + key_data, sizeof( key_data ), + &key_size ) ); + SYS_CHECK( ( key_file = fopen( output_file_name, "wb" ) ) != NULL ); + SYS_CHECK( fwrite( key_data, 1, key_size, key_file ) == key_size ); + SYS_CHECK( fclose( key_file ) == 0 ); + key_file = NULL; + +exit: + if( key_file != NULL) + fclose( key_file ); + return( status ); +} + +/* Generate a master key for use in this demo. + * + * Normally a master key would be non-exportable. For the purpose of this + * demo, we want to save it to a file, to avoid relying on the keystore + * capability of the PSA crypto library. */ +static psa_status_t generate( const char *key_file_name ) +{ + psa_status_t status = PSA_SUCCESS; + psa_key_id_t key = 0; + psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; + + psa_set_key_usage_flags( &attributes, + PSA_KEY_USAGE_DERIVE | PSA_KEY_USAGE_EXPORT ); + psa_set_key_algorithm( &attributes, KDF_ALG ); + psa_set_key_type( &attributes, PSA_KEY_TYPE_DERIVE ); + psa_set_key_bits( &attributes, PSA_BYTES_TO_BITS( KEY_SIZE_BYTES ) ); + + PSA_CHECK( psa_generate_key( &attributes, &key ) ); + + PSA_CHECK( save_key( key, key_file_name ) ); + +exit: + (void) psa_destroy_key( key ); + return( status ); +} + +/* Load the master key from a file. + * + * In the real world, this master key would be stored in an internal memory + * and the storage would be managed by the keystore capability of the PSA + * crypto library. */ +static psa_status_t import_key_from_file( psa_key_usage_t usage, + psa_algorithm_t alg, + const char *key_file_name, + psa_key_id_t *master_key ) +{ + psa_status_t status = PSA_SUCCESS; + psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; + uint8_t key_data[KEY_SIZE_BYTES]; + size_t key_size; + FILE *key_file = NULL; + unsigned char extra_byte; + + SYS_CHECK( ( key_file = fopen( key_file_name, "rb" ) ) != NULL ); + SYS_CHECK( ( key_size = fread( key_data, 1, sizeof( key_data ), + key_file ) ) != 0 ); + if( fread( &extra_byte, 1, 1, key_file ) != 0 ) + { + printf( "Key file too large (max: %u).\n", + (unsigned) sizeof( key_data ) ); + status = DEMO_ERROR; + goto exit; + } + SYS_CHECK( fclose( key_file ) == 0 ); + key_file = NULL; + + psa_set_key_usage_flags( &attributes, usage ); + psa_set_key_algorithm( &attributes, alg ); + psa_set_key_type( &attributes, PSA_KEY_TYPE_DERIVE ); + PSA_CHECK( psa_import_key( &attributes, key_data, key_size, master_key ) ); +exit: + if( key_file != NULL ) + fclose( key_file ); + mbedtls_platform_zeroize( key_data, sizeof( key_data ) ); + if( status != PSA_SUCCESS ) + { + /* If the key creation hasn't happened yet or has failed, + * *master_key is null. psa_destroy_key( 0 ) is + * guaranteed to do nothing and return PSA_SUCCESS. */ + (void) psa_destroy_key( *master_key ); + *master_key = 0; + } + return( status ); +} + +/* Derive the intermediate keys, using the list of labels provided on + * the command line. On input, *key is the master key identifier. + * This function destroys the master key. On successful output, *key + * is the identifier of the final derived key. + */ +static psa_status_t derive_key_ladder( const char *ladder[], + size_t ladder_depth, + psa_key_id_t *key ) +{ + psa_status_t status = PSA_SUCCESS; + psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; + psa_key_derivation_operation_t operation = PSA_KEY_DERIVATION_OPERATION_INIT; + size_t i; + + psa_set_key_usage_flags( &attributes, + PSA_KEY_USAGE_DERIVE | PSA_KEY_USAGE_EXPORT ); + psa_set_key_algorithm( &attributes, KDF_ALG ); + psa_set_key_type( &attributes, PSA_KEY_TYPE_DERIVE ); + psa_set_key_bits( &attributes, PSA_BYTES_TO_BITS( KEY_SIZE_BYTES ) ); + + /* For each label in turn, ... */ + for( i = 0; i < ladder_depth; i++ ) + { + /* Start deriving material from the master key (if i=0) or from + * the current intermediate key (if i>0). */ + PSA_CHECK( psa_key_derivation_setup( &operation, KDF_ALG ) ); + PSA_CHECK( psa_key_derivation_input_bytes( + &operation, PSA_KEY_DERIVATION_INPUT_SALT, + DERIVE_KEY_SALT, DERIVE_KEY_SALT_LENGTH ) ); + PSA_CHECK( psa_key_derivation_input_key( + &operation, PSA_KEY_DERIVATION_INPUT_SECRET, + *key ) ); + PSA_CHECK( psa_key_derivation_input_bytes( + &operation, PSA_KEY_DERIVATION_INPUT_INFO, + (uint8_t*) ladder[i], strlen( ladder[i] ) ) ); + /* When the parent key is not the master key, destroy it, + * since it is no longer needed. */ + PSA_CHECK( psa_destroy_key( *key ) ); + *key = 0; + /* Derive the next intermediate key from the parent key. */ + PSA_CHECK( psa_key_derivation_output_key( &attributes, &operation, + key ) ); + PSA_CHECK( psa_key_derivation_abort( &operation ) ); + } + +exit: + psa_key_derivation_abort( &operation ); + if( status != PSA_SUCCESS ) + { + psa_destroy_key( *key ); + *key = 0; + } + return( status ); +} + +/* Derive a wrapping key from the last intermediate key. */ +static psa_status_t derive_wrapping_key( psa_key_usage_t usage, + psa_key_id_t derived_key, + psa_key_id_t *wrapping_key ) +{ + psa_status_t status = PSA_SUCCESS; + psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; + psa_key_derivation_operation_t operation = PSA_KEY_DERIVATION_OPERATION_INIT; + + *wrapping_key = 0; + + /* Set up a key derivation operation from the key derived from + * the master key. */ + PSA_CHECK( psa_key_derivation_setup( &operation, KDF_ALG ) ); + PSA_CHECK( psa_key_derivation_input_bytes( + &operation, PSA_KEY_DERIVATION_INPUT_SALT, + WRAPPING_KEY_SALT, WRAPPING_KEY_SALT_LENGTH ) ); + PSA_CHECK( psa_key_derivation_input_key( + &operation, PSA_KEY_DERIVATION_INPUT_SECRET, + derived_key ) ); + PSA_CHECK( psa_key_derivation_input_bytes( + &operation, PSA_KEY_DERIVATION_INPUT_INFO, + NULL, 0 ) ); + + /* Create the wrapping key. */ + psa_set_key_usage_flags( &attributes, usage ); + psa_set_key_algorithm( &attributes, WRAPPING_ALG ); + psa_set_key_type( &attributes, PSA_KEY_TYPE_AES ); + psa_set_key_bits( &attributes, WRAPPING_KEY_BITS ); + PSA_CHECK( psa_key_derivation_output_key( &attributes, &operation, + wrapping_key ) ); + +exit: + psa_key_derivation_abort( &operation ); + return( status ); +} + +static psa_status_t wrap_data( const char *input_file_name, + const char *output_file_name, + psa_key_id_t wrapping_key ) +{ + psa_status_t status; + FILE *input_file = NULL; + FILE *output_file = NULL; + psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; + psa_key_type_t key_type; + long input_position; + size_t input_size; + size_t buffer_size = 0; + unsigned char *buffer = NULL; + size_t ciphertext_size; + wrapped_data_header_t header; + + /* Find the size of the data to wrap. */ + SYS_CHECK( ( input_file = fopen( input_file_name, "rb" ) ) != NULL ); + SYS_CHECK( fseek( input_file, 0, SEEK_END ) == 0 ); + SYS_CHECK( ( input_position = ftell( input_file ) ) != -1 ); +#if LONG_MAX > SIZE_MAX + if( input_position > SIZE_MAX ) + { + printf( "Input file too large.\n" ); + status = DEMO_ERROR; + goto exit; + } +#endif + input_size = input_position; + PSA_CHECK( psa_get_key_attributes( wrapping_key, &attributes ) ); + key_type = psa_get_key_type( &attributes ); + buffer_size = + PSA_AEAD_ENCRYPT_OUTPUT_SIZE( key_type, WRAPPING_ALG, input_size ); + /* Check for integer overflow. */ + if( buffer_size < input_size ) + { + printf( "Input file too large.\n" ); + status = DEMO_ERROR; + goto exit; + } + + /* Load the data to wrap. */ + SYS_CHECK( fseek( input_file, 0, SEEK_SET ) == 0 ); + SYS_CHECK( ( buffer = calloc( 1, buffer_size ) ) != NULL ); + SYS_CHECK( fread( buffer, 1, input_size, input_file ) == input_size ); + SYS_CHECK( fclose( input_file ) == 0 ); + input_file = NULL; + + /* Construct a header. */ + memcpy( &header.magic, WRAPPED_DATA_MAGIC, WRAPPED_DATA_MAGIC_LENGTH ); + header.ad_size = sizeof( header ); + header.payload_size = input_size; + + /* Wrap the data. */ + PSA_CHECK( psa_generate_random( header.iv, WRAPPING_IV_SIZE ) ); + PSA_CHECK( psa_aead_encrypt( wrapping_key, WRAPPING_ALG, + header.iv, WRAPPING_IV_SIZE, + (uint8_t *) &header, sizeof( header ), + buffer, input_size, + buffer, buffer_size, + &ciphertext_size ) ); + + /* Write the output. */ + SYS_CHECK( ( output_file = fopen( output_file_name, "wb" ) ) != NULL ); + SYS_CHECK( fwrite( &header, 1, sizeof( header ), + output_file ) == sizeof( header ) ); + SYS_CHECK( fwrite( buffer, 1, ciphertext_size, + output_file ) == ciphertext_size ); + SYS_CHECK( fclose( output_file ) == 0 ); + output_file = NULL; + +exit: + if( input_file != NULL ) + fclose( input_file ); + if( output_file != NULL ) + fclose( output_file ); + if( buffer != NULL ) + mbedtls_platform_zeroize( buffer, buffer_size ); + free( buffer ); + return( status ); +} + +static psa_status_t unwrap_data( const char *input_file_name, + const char *output_file_name, + psa_key_id_t wrapping_key ) +{ + psa_status_t status; + FILE *input_file = NULL; + FILE *output_file = NULL; + psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; + psa_key_type_t key_type; + unsigned char *buffer = NULL; + size_t ciphertext_size = 0; + size_t plaintext_size; + wrapped_data_header_t header; + unsigned char extra_byte; + + /* Load and validate the header. */ + SYS_CHECK( ( input_file = fopen( input_file_name, "rb" ) ) != NULL ); + SYS_CHECK( fread( &header, 1, sizeof( header ), + input_file ) == sizeof( header ) ); + if( memcmp( &header.magic, WRAPPED_DATA_MAGIC, + WRAPPED_DATA_MAGIC_LENGTH ) != 0 ) + { + printf( "The input does not start with a valid magic header.\n" ); + status = DEMO_ERROR; + goto exit; + } + if( header.ad_size != sizeof( header ) ) + { + printf( "The header size is not correct.\n" ); + status = DEMO_ERROR; + goto exit; + } + PSA_CHECK( psa_get_key_attributes( wrapping_key, &attributes) ); + key_type = psa_get_key_type( &attributes); + ciphertext_size = + PSA_AEAD_ENCRYPT_OUTPUT_SIZE( key_type, WRAPPING_ALG, header.payload_size ); + /* Check for integer overflow. */ + if( ciphertext_size < header.payload_size ) + { + printf( "Input file too large.\n" ); + status = DEMO_ERROR; + goto exit; + } + + /* Load the payload data. */ + SYS_CHECK( ( buffer = calloc( 1, ciphertext_size ) ) != NULL ); + SYS_CHECK( fread( buffer, 1, ciphertext_size, + input_file ) == ciphertext_size ); + if( fread( &extra_byte, 1, 1, input_file ) != 0 ) + { + printf( "Extra garbage after ciphertext\n" ); + status = DEMO_ERROR; + goto exit; + } + SYS_CHECK( fclose( input_file ) == 0 ); + input_file = NULL; + + /* Unwrap the data. */ + PSA_CHECK( psa_aead_decrypt( wrapping_key, WRAPPING_ALG, + header.iv, WRAPPING_IV_SIZE, + (uint8_t *) &header, sizeof( header ), + buffer, ciphertext_size, + buffer, ciphertext_size, + &plaintext_size ) ); + if( plaintext_size != header.payload_size ) + { + printf( "Incorrect payload size in the header.\n" ); + status = DEMO_ERROR; + goto exit; + } + + /* Write the output. */ + SYS_CHECK( ( output_file = fopen( output_file_name, "wb" ) ) != NULL ); + SYS_CHECK( fwrite( buffer, 1, plaintext_size, + output_file ) == plaintext_size ); + SYS_CHECK( fclose( output_file ) == 0 ); + output_file = NULL; + +exit: + if( input_file != NULL ) + fclose( input_file ); + if( output_file != NULL ) + fclose( output_file ); + if( buffer != NULL ) + mbedtls_platform_zeroize( buffer, ciphertext_size ); + free( buffer ); + return( status ); +} + +static psa_status_t run( enum program_mode mode, + const char *key_file_name, + const char *ladder[], size_t ladder_depth, + const char *input_file_name, + const char *output_file_name ) +{ + psa_status_t status = PSA_SUCCESS; + psa_key_id_t derivation_key = 0; + psa_key_id_t wrapping_key = 0; + + /* Initialize the PSA crypto library. */ + PSA_CHECK( psa_crypto_init( ) ); + + /* Generate mode is unlike the others. Generate the master key and exit. */ + if( mode == MODE_GENERATE ) + return( generate( key_file_name ) ); + + /* Read the master key. */ + PSA_CHECK( import_key_from_file( PSA_KEY_USAGE_DERIVE | PSA_KEY_USAGE_EXPORT, + KDF_ALG, + key_file_name, + &derivation_key ) ); + + /* Calculate the derived key for this session. */ + PSA_CHECK( derive_key_ladder( ladder, ladder_depth, + &derivation_key ) ); + + switch( mode ) + { + case MODE_SAVE: + PSA_CHECK( save_key( derivation_key, output_file_name ) ); + break; + case MODE_UNWRAP: + PSA_CHECK( derive_wrapping_key( PSA_KEY_USAGE_DECRYPT, + derivation_key, + &wrapping_key ) ); + PSA_CHECK( unwrap_data( input_file_name, output_file_name, + wrapping_key ) ); + break; + case MODE_WRAP: + PSA_CHECK( derive_wrapping_key( PSA_KEY_USAGE_ENCRYPT, + derivation_key, + &wrapping_key ) ); + PSA_CHECK( wrap_data( input_file_name, output_file_name, + wrapping_key ) ); + break; + default: + /* Unreachable but some compilers don't realize it. */ + break; + } + +exit: + /* Destroy any remaining key. Deinitializing the crypto library would do + * this anyway since they are volatile keys, but explicitly destroying + * keys makes the code easier to reuse. */ + (void) psa_destroy_key( derivation_key ); + (void) psa_destroy_key( wrapping_key ); + /* Deinitialize the PSA crypto library. */ + mbedtls_psa_crypto_free( ); + return( status ); +} + +static void usage( void ) +{ + printf( "Usage: key_ladder_demo MODE [OPTION=VALUE]...\n" ); + printf( "Demonstrate the usage of a key derivation ladder.\n" ); + printf( "\n" ); + printf( "Modes:\n" ); + printf( " generate Generate the master key\n" ); + printf( " save Save the derived key\n" ); + printf( " unwrap Unwrap (decrypt) input with the derived key\n" ); + printf( " wrap Wrap (encrypt) input with the derived key\n" ); + printf( "\n" ); + printf( "Options:\n" ); + printf( " input=FILENAME Input file (required for wrap/unwrap)\n" ); + printf( " master=FILENAME File containing the master key (default: master.key)\n" ); + printf( " output=FILENAME Output file (required for save/wrap/unwrap)\n" ); + printf( " label=TEXT Label for the key derivation.\n" ); + printf( " This may be repeated multiple times.\n" ); + printf( " To get the same key, you must use the same master key\n" ); + printf( " and the same sequence of labels.\n" ); +} + +int main( int argc, char *argv[] ) +{ + const char *key_file_name = "master.key"; + const char *input_file_name = NULL; + const char *output_file_name = NULL; + const char *ladder[MAX_LADDER_DEPTH]; + size_t ladder_depth = 0; + int i; + enum program_mode mode; + psa_status_t status; + + if( argc <= 1 || + strcmp( argv[1], "help" ) == 0 || + strcmp( argv[1], "-help" ) == 0 || + strcmp( argv[1], "--help" ) == 0 ) + { + usage( ); + return( EXIT_SUCCESS ); + } + + for( i = 2; i < argc; i++ ) + { + char *q = strchr( argv[i], '=' ); + if( q == NULL ) + { + printf( "Missing argument to option %s\n", argv[i] ); + goto usage_failure; + } + *q = 0; + ++q; + if( strcmp( argv[i], "input" ) == 0 ) + input_file_name = q; + else if( strcmp( argv[i], "label" ) == 0 ) + { + if( ladder_depth == MAX_LADDER_DEPTH ) + { + printf( "Maximum ladder depth %u exceeded.\n", + (unsigned) MAX_LADDER_DEPTH ); + return( EXIT_FAILURE ); + } + ladder[ladder_depth] = q; + ++ladder_depth; + } + else if( strcmp( argv[i], "master" ) == 0 ) + key_file_name = q; + else if( strcmp( argv[i], "output" ) == 0 ) + output_file_name = q; + else + { + printf( "Unknown option: %s\n", argv[i] ); + goto usage_failure; + } + } + + if( strcmp( argv[1], "generate" ) == 0 ) + mode = MODE_GENERATE; + else if( strcmp( argv[1], "save" ) == 0 ) + mode = MODE_SAVE; + else if( strcmp( argv[1], "unwrap" ) == 0 ) + mode = MODE_UNWRAP; + else if( strcmp( argv[1], "wrap" ) == 0 ) + mode = MODE_WRAP; + else + { + printf( "Unknown action: %s\n", argv[1] ); + goto usage_failure; + } + + if( input_file_name == NULL && + ( mode == MODE_WRAP || mode == MODE_UNWRAP ) ) + { + printf( "Required argument missing: input\n" ); + return( DEMO_ERROR ); + } + if( output_file_name == NULL && + ( mode == MODE_SAVE || mode == MODE_WRAP || mode == MODE_UNWRAP ) ) + { + printf( "Required argument missing: output\n" ); + return( DEMO_ERROR ); + } + + status = run( mode, key_file_name, + ladder, ladder_depth, + input_file_name, output_file_name ); + return( status == PSA_SUCCESS ? + EXIT_SUCCESS : + EXIT_FAILURE ); + +usage_failure: + usage( ); + return( EXIT_FAILURE ); +} +#endif /* MBEDTLS_SHA256_C && MBEDTLS_MD_C && MBEDTLS_AES_C && MBEDTLS_CCM_C && MBEDTLS_PSA_CRYPTO_C && MBEDTLS_FS_IO */ |