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92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
#include <stdio.h>
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#include "gcrypt.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <strings.h>
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#include <inttypes.h>
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#include "cryptwrapper.h"
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int main(int argc, char const *argv[]) {
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if (argc < 3){
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printf("please select file and pw\n");
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return 1;
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}
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FILE * fptr = fopen(argv[1],"rb");
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if (fptr==NULL){
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printf("could not open file %s\n",argv[1]);
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return 1;
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}
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char * new_file_name = malloc(strlen(argv[1]+5));
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strcpy(new_file_name,argv[1]);
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strcat(new_file_name,".encry");
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FILE * tfptr = fopen(new_file_name,"wb");
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if (fseek(fptr,0,SEEK_END)){
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printf("could not ssek end\n");
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return 1;
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};
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int file_len = ftell(fptr);
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rewind(fptr);// sets pointer to beginning of file
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//printf("file is %d long\n", file_len);
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char * buf_out = malloc(file_len + 32); // for sha256 check sum 32*8=256 lol
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if (buf_out==NULL){
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perror("could not allocate memory\n");
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}
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if (buf_out == NULL){
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printf("could not allocate memory, maybe file is too large\n");
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return 1;
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}
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if (file_len!=fread(buf_out,sizeof(char),file_len,fptr)){
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printf("could not read all data from file\nfile_len=%d",file_len);
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return 1;
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}
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//calculating sha256 hash to append to file
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uint8_t * pw_hash = malloc(gcry_md_get_algo_dlen(algo));
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uint8_t * file_hash = malloc(gcry_md_get_algo_dlen(algo));
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mycryptwrapper_init();
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gcry_md_hash_buffer(algo,pw_hash,argv[2],strlen(argv[2]));
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gcry_md_hash_buffer(algo,file_hash,buf_out,file_len);
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printf("filehash:\n");
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mycryptwrapper_print(file_hash,32);
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//appending sha256 to end of buffer
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for (size_t i = 0; i<+32; i++){
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buf_out[i+file_len] = file_hash[i];
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}
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gcry_cipher_hd_t hd;
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if (gcry_cipher_open(&hd,cipher,GCRY_CIPHER_MODE_CFB,0)){
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perror("could not open handle for cipher\n");
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return 1;
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}
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if(gcry_cipher_setkey(hd,pw_hash,8)){
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printf("could not set key for encryption");
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return 1;
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}
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size_t len = 8;
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void * iv = malloc(len);
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if (gcry_cipher_setiv(hd, iv , len)){
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printf("could not init init vector");
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return 1;
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}
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if (gcry_cipher_encrypt(hd,buf_out,file_len+32,NULL,0)){
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perror("could not encrypt data\n");
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return 1;
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}
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if (fwrite(buf_out, sizeof(char),file_len+32,tfptr)!= file_len+32){
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perror("could not write all data\n");
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return 1;
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}
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gcry_cipher_close(hd);
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fclose(fptr);
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fclose(tfptr);
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printf("successfully encrypted file %s with sha256 check sum and stored in file %s\n",argv[1],new_file_name);
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return 0;
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} |