[Assignment-7] cleanup

7-SGX_Hands-on/src/app/intermediary.c

@@ -1,195 +0,0 @@
-#include <errno.h>
-#include <sgx_urts.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "intermediary.h"
-#include "util.h"
-
-#include <openssl/core_names.h>
-#include <openssl/err.h>
-#include <openssl/evp.h>
-#include <openssl/pem.h>
-
-#define HASH_BYTES 32
-#define HASH_CHUNK_BYTES 32
-#define KEY_BYTES 32
-
-struct IntermediaryArgs {
-    char* key_path;
-    char* firmware_path;
-};
-
-
-/*
-static int generate_key(EVP_PKEY** key) {
-    OSSL_PARAM key_params[2];
-    EVP_PKEY_CTX* gctx;
-
-    gctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", NULL);
-    if (gctx == NULL)
-        return (1);
-
-    if (EVP_PKEY_keygen_init(gctx) != 1)
-        return (2);
-
-    key_params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, "prime256v1", 0);
-    key_params[1] = OSSL_PARAM_construct_end();
-
-    if (EVP_PKEY_CTX_set_params(gctx, key_params) != 1)
-        return (3);
-
-    if(EVP_PKEY_generate(gctx, key) != 1)
-        return (4);
-
-    EVP_PKEY_CTX_free(gctx);
-    return (0);
-}
-*/
-
-
-char* intermediary_syntax(void) {
-    return
-        "intermediary       mock up implementation of the employee binary\n"
-        "                   outputs signature on stdout\n"
-        "                   WARNING: output is in binary format, may mess up terminal\n"
-        "    -ekey <path>   file path of the PEM encoded private key of the employee\n"
-        "    -firm <path>   path of the firmware\n";
-}
-
-int handle_intermediary(int argc, char** argv) {
-    struct IntermediaryArgs args = {
-        NULL,
-        NULL
-    };
-    FILE* key_file = NULL;
-    FILE* firmware_file = NULL;
-    uint8_t firmware_chunk[HASH_CHUNK_BYTES];
-    EVP_PKEY* key = NULL;
-    EVP_MD_CTX *mdctx = NULL;
-    size_t sig_len;
-    unsigned char* sig = NULL;
-    int status = EXIT_FAILURE;
-
-    /*
-     * Parse Input
-     */
-
-    int i = 0;
-    while(i < argc) {
-        if(strcmp(argv[i], "-ekey")==0 && argc-i >=2){
-            args.key_path = argv[i+1];
-            i += 2;
-        }else if(strcmp(argv[i], "-firm")==0 && argc-i >=2){
-            args.firmware_path = argv[i+1];
-            i += 2;
-        }else
-            syntax_exit();
-    }
-
-    if(args.key_path == NULL)
-        syntax_exit();
-
-
-    /*
-     * Load Signing Key
-     */
-
-    key_file = fopen(args.key_path, "rb");
-    if(key_file == NULL){
-        perror("Error opening key file");
-        status = EXIT_FAILURE;
-        goto cleanup;
-    }
-    key = PEM_read_PrivateKey(key_file, &key, NULL, NULL);
-    if(key == NULL) {
-        fprintf(stderr, "failed to read key");
-        fclose(key_file);
-        status = EXIT_FAILURE;
-        goto cleanup;
-    }
-
-    fclose(key_file);
-
-    /*
-     * Sign Firmware
-     */
-
-    firmware_file = fopen(args.firmware_path, "rb");
-    if(firmware_file == NULL){
-        perror("Error opening firmware file");
-        status = EXIT_FAILURE;
-        goto cleanup;
-    }
-
-    mdctx = EVP_MD_CTX_new();
-    if (EVP_DigestSignInit(mdctx, NULL, EVP_sha256(), NULL, key) != 1) {
-        fprintf(stderr, "Message digest initialization failed.\n");
-        fclose(firmware_file);
-        status = EXIT_FAILURE;
-        goto cleanup;
-    }
-
-
-    size_t chunk_len = HASH_CHUNK_BYTES;
-    while(chunk_len==HASH_CHUNK_BYTES) {
-        chunk_len = fread(&firmware_chunk, 1, HASH_CHUNK_BYTES, firmware_file);
-        if(chunk_len!=HASH_CHUNK_BYTES&&ferror(firmware_file)!=0){
-            perror("Failed to read firmware file");
-            exit(EXIT_FAILURE);
-        }
-
-        if (EVP_DigestSignUpdate(mdctx, firmware_chunk, chunk_len) != 1) {
-            printf("Message digest update failed.\n");
-            exit(EXIT_FAILURE);
-        }
-    }
-
-    fclose(firmware_file);
-
-    // call with empty sig to get length
-    if (EVP_DigestSignFinal(mdctx, NULL, &sig_len) != 1) {
-        printf("Message digest finalization failed.\n");
-        status = EXIT_FAILURE;
-        goto cleanup;
-    }
-
-    // allocate signature buffer
-    sig = malloc(sizeof(unsigned char) * sig_len);
-    if(sig == NULL){
-        perror("could not initialize digest buffer");
-        status = EXIT_FAILURE;
-        goto cleanup;
-    }
-
-    // load signature into buffer
-    if (EVP_DigestSignFinal(mdctx, sig, &sig_len) != 1) {
-        printf("Message digest finalization failed.\n");
-        EVP_MD_CTX_free(mdctx);
-        status = EXIT_FAILURE;
-        goto cleanup;
-    }
-
-    fwrite(sig, sig_len, 1, stdout);
-    if (ferror(stdout) != 0) {
-        fprintf(stdout, "failed to write signature to stdout\n");
-        status = EXIT_FAILURE;
-        goto cleanup;
-    }
-
-    fflush(stdout);
-
-    status = EXIT_SUCCESS;
-
-    // free all allocated resources
-cleanup:
-    if(sig != NULL)
-        free(sig);
-    if (mdctx != NULL)
-        EVP_MD_CTX_free(mdctx);
-    if (key != NULL)
-        EVP_PKEY_free(key);
-    exit(status);
-}

7-SGX_Hands-on/src/app/intermediary.h

@@ -1,23 +0,0 @@
-#ifndef _APP_INTERMEDIARY_H_
-#define _APP_INTERMEDIARY_H_
-
-
-/*
- * @brief getter for intermediary subcommand syntax string
- *
- * @returns null-terminated syntax string
- */
-char* intermediary_syntax(void);
-
-/*
- * @brief CLI implementation for the "intermediary" subcommand
- *
- * @param argc number of arguments with command and subcommand stripped
- * @param argv arguments with command and subcommand stripped
- *
- * @returns 0 on success, else error with output on stderr
- */
-int handle_intermediary(int argc, char** argv);
-
-
-#endif

7-SGX_Hands-on/src/app/intermediary_key.pem

@@ -1,5 +0,0 @@
------BEGIN EC PRIVATE KEY-----
-MHcCAQEEIH0KXxaw/nRzJU5evlEJQrciYUtfJ16PILWtlA5KKh/koAoGCCqGSM49
-AwEHoUQDQgAEduVQXmH1K+ocSSnv0l9PKdC2+xxPQrVyABAYGk+jlo2hugpH8aWk
-nfR9cTTOLy6T7ASx3a22S6DftcTz+aZYsg==
------END EC PRIVATE KEY-----

7-SGX_Hands-on/src/app/test.c

@@ -1,3 +0,0 @@
-int main() {
-    return (0);
-}