works for larger files and threads are exit if pw was found. I do this with global variable. This should be thread safe as long as only one password matches (so ranbow table must be a set with no equal entries).

README.md

@@ -5,4 +5,6 @@ usage:
 	./encryptf file password to encrypt file with passwort(the sha256 hash is used)
 	./brutef file.txt.sha256 file.encry to decrypt
 
-notes: does not work with larger files and all threads continue calculating even if password was found
+
+fix:
+does not work with larger files (>60840bytes) and all threads continue calculating even if password was found

decrypt.c

@@ -67,6 +67,7 @@ int main(int argc, char const *argv[]) {
     // read a block of rainbow values
     int success = 0;
     while ((num_rainbow_values=fread(rs, sizeof(struct s_rainbowvalue256),BULKSIZE,fptr_rainbow ))!=0){
+        if (success==1){break;}
         printf("read %d rainbow values\n", (int) num_rainbow_values);
         // iterate through rainbow values and decrypt
 
@@ -77,9 +78,11 @@ int main(int argc, char const *argv[]) {
             if (gcry_cipher_open(&dhd,cipher,GCRY_CIPHER_MODE_CFB,0)){perror("could not open cypher\n");}
             if (gcry_cipher_setkey(dhd,rs[i].hash,8)){perror("could not set key\n");};
             void * iv = malloc(len);
+            memset(iv,0,len);
             if (gcry_cipher_setiv(dhd, iv , len)){perror("could not set init vector\n");}
             if (gcry_cipher_decrypt(dhd,decrypted_buf,file_len,buf,file_len)){perror("could not decrypt\n");}
             //mycryptwrapper_print(decrypted_buf,file_len);
+            //printf("pw: %s\nfile:%s\n",rs[i].pw,decrypted_buf);
             if (check_sha256_tag(decrypted_buf,file_len)){
                 printf("pw: %s\n", rs[i].pw);
 
@@ -96,12 +99,15 @@ int main(int argc, char const *argv[]) {
                 printf("successfully saved decrypted data in %s\n", enc_fname);
                 //return 0;
                 success=1;
-#pragma omp exitregion
+            #pragma omp exitregion
                 }
             free(iv);
             free(decrypted_buf);
             gcry_cipher_close(dhd);
         }
+        if (success==1){
+#pragma omp exitregion
+        }
     }
     /*while (fread(&r, sizeof(struct s_rainbowvalue256), 1,fptr)) {//reading hash values from rainbowtable
         gcry_cipher_hd_t dhd;

encrypt.c

@@ -30,6 +30,9 @@ int main(int argc, char const *argv[]) {
     rewind(fptr);// sets pointer to beginning of file
     //printf("file is %d long\n", file_len);
     char * buf_out = malloc(file_len + 32); //  for sha256 check sum 32*8=256 lol
+    if (buf_out==NULL){
+        perror("could not allocate memory\n");
+    }
     if (buf_out == NULL){
         printf("could not allocate memory, maybe file is too large\n");
         return 1;
@@ -48,7 +51,8 @@ int main(int argc, char const *argv[]) {
     mycryptwrapper_init();
     gcry_md_hash_buffer(algo,pw_hash,argv[2],strlen(argv[2]));
     gcry_md_hash_buffer(algo,file_hash,buf_out,file_len);
-
+    printf("filehash:\n");
+    mycryptwrapper_print(file_hash,32);
 
     //appending sha256 to end of buffer
     for (size_t i = 0; i<+32; i++){