Version v0.2.74 - Added silent decrypt mode for clean pipe operations

encrypted.txt

@@ -0,0 +1,11 @@
+
+
+-----BEGIN OTP MESSAGE-----
+Version: v0.2.72
+Pad-ChkSum: 97d9d82b5414a9439102f3811fb90ab1d6368a00d33229a18b306476f9d04f82
+Pad-Offset: 2873419
+
+iR6J7HHK1Oc6
+-----END OTP MESSAGE-----
+
+

otp.c

@@ -46,6 +46,9 @@ static const int base64_decode_table[256] = {
 // Global variable for current pads directory (can be local or OTP thumb drive)
 static char current_pads_dir[512] = DEFAULT_PADS_DIR;
 
+// Global variable for default pad path from preferences
+static char default_pad_path[1024] = "";
+
 // Function prototypes
 int main(int argc, char* argv[]);
 int interactive_mode(void);
@@ -56,6 +59,14 @@ int pipe_mode(int argc, char* argv[], const char* piped_text);
 int has_stdin_data(void);
 char* read_stdin_text(void);
 
+// Preferences management functions
+int load_preferences(void);
+int save_preferences(void);
+char* get_preference(const char* key);
+int set_preference(const char* key, const char* value);
+char* get_default_pad_path(void);
+int set_default_pad_path(const char* pad_path);
+
 // OTP thumb drive detection function
 int detect_otp_thumb_drive(char* otp_drive_path, size_t path_size);
 
@@ -70,6 +81,7 @@ int generate_pad(uint64_t size_bytes, int show_progress);
 int generate_pad_with_entropy(uint64_t size_bytes, int show_progress, int use_keyboard_entropy);
 int encrypt_text(const char* pad_identifier, const char* input_text);
 int decrypt_text(const char* pad_identifier, const char* encrypted_message);
+int decrypt_text_silent(const char* pad_identifier, const char* encrypted_message);
 int encrypt_file(const char* pad_identifier, const char* input_file, const char* output_file, int ascii_armor);
 int decrypt_file(const char* input_file, const char* output_file);
 int decrypt_binary_file(FILE* input_fp, const char* output_file);
@@ -120,18 +132,26 @@ void get_directory_display(const char* file_path, char* result, size_t result_si
 void print_usage(const char* program_name);
 
 int main(int argc, char* argv[]) {
+    // Load preferences first
+    load_preferences();
+    
+    // Check for piped input first (before any output)
+    int is_pipe_mode = (argc == 1 && has_stdin_data());
+    
     // Check for OTP thumb drive on startup
     char otp_drive_path[512];
     if (detect_otp_thumb_drive(otp_drive_path, sizeof(otp_drive_path))) {
-        printf("Detected OTP thumb drive: %s\n", otp_drive_path);
-        printf("Using as default pads directory for this session.\n\n");
+        // Only show messages in interactive/command mode, not pipe mode
+        if (!is_pipe_mode) {
+            printf("Detected OTP thumb drive: %s\n", otp_drive_path);
+            printf("Using as default pads directory for this session.\n\n");
+        }
         strncpy(current_pads_dir, otp_drive_path, sizeof(current_pads_dir) - 1);
         current_pads_dir[sizeof(current_pads_dir) - 1] = '\0';
     }
     
-    // Check for piped input
-    if (argc == 1 && has_stdin_data()) {
-        // No arguments but has piped data - enter pipe mode for interactive pad selection
+    if (is_pipe_mode) {
+        // No arguments but has piped data - enter pipe mode
         char* piped_text = read_stdin_text();
         if (piped_text) {
             int result = pipe_mode(argc, argv, piped_text);
@@ -219,6 +239,16 @@ int command_line_mode(int argc, char* argv[]) {
     }
     else if (strcmp(argv[1], "decrypt") == 0 || strcmp(argv[1], "-d") == 0) {
         if (argc == 2) {
+            // Check for piped input first
+            if (has_stdin_data()) {
+                // Piped decrypt mode - read stdin and decrypt silently
+                char* piped_message = read_stdin_text();
+                if (piped_message) {
+                    int result = decrypt_text_silent(NULL, piped_message);
+                    free(piped_message);
+                    return result;
+                }
+            }
             // Interactive mode - no arguments needed
             return decrypt_text(NULL, NULL);
         }
@@ -1371,8 +1401,15 @@ int encrypt_text(const char* pad_identifier, const char* input_text) {
         printf("Warning: Failed to update state file\n");
     }
     
-    // Output in ASCII armor format
-    printf("\n\n-----BEGIN OTP MESSAGE-----\n");
+    // Output in ASCII armor format - clean format for piping, spaced format for interactive
+    int is_interactive = (input_text == NULL); // Interactive if no input_text provided
+    
+    if (is_interactive) {
+        printf("\n\n-----BEGIN OTP MESSAGE-----\n");
+    } else {
+        printf("-----BEGIN OTP MESSAGE-----\n");
+    }
+    
     printf("Version: %s\n", get_version());
     printf("Pad-ChkSum: %s\n", chksum_hex);
     printf("Pad-Offset: %lu\n", current_offset);
@@ -1384,7 +1421,11 @@ int encrypt_text(const char* pad_identifier, const char* input_text) {
         printf("%.64s\n", base64_cipher + i);
     }
     
-    printf("-----END OTP MESSAGE-----\n\n\n");
+    if (is_interactive) {
+        printf("-----END OTP MESSAGE-----\n\n\n");
+    } else {
+        printf("-----END OTP MESSAGE-----\n");
+    }
     
     // Cleanup
     free(pad_data);
@@ -1569,6 +1610,131 @@ int decrypt_text(const char* pad_identifier, const char* encrypted_message) {
     return 0;
 }
 
+int decrypt_text_silent(const char* pad_identifier, const char* encrypted_message) {
+    // For piped decrypt mode - silent operation with minimal output
+    (void)pad_identifier; // Suppress unused parameter warning
+    
+    char line[MAX_LINE_LENGTH];
+    char stored_chksum[MAX_HASH_LENGTH];
+    char current_chksum[MAX_HASH_LENGTH];
+    uint64_t pad_offset;
+    char base64_data[MAX_INPUT_SIZE * 2] = {0};
+    int in_data_section = 0;
+    
+    if (encrypted_message != NULL) {
+        // Parse provided encrypted message
+        char *message_copy = strdup(encrypted_message);
+        char *line_ptr = strtok(message_copy, "\n");
+        
+        int found_begin = 0;
+        while (line_ptr != NULL) {
+            if (strcmp(line_ptr, "-----BEGIN OTP MESSAGE-----") == 0) {
+                found_begin = 1;
+            }
+            else if (strcmp(line_ptr, "-----END OTP MESSAGE-----") == 0) {
+                break;
+            }
+            else if (found_begin) {
+                if (strncmp(line_ptr, "Pad-ChkSum: ", 12) == 0) {
+                    strncpy(stored_chksum, line_ptr + 12, 64);
+                    stored_chksum[64] = '\0';
+                }
+                else if (strncmp(line_ptr, "Pad-Offset: ", 12) == 0) {
+                    pad_offset = strtoull(line_ptr + 12, NULL, 10);
+                }
+                else if (strlen(line_ptr) == 0) {
+                    in_data_section = 1;
+                }
+                else if (in_data_section) {
+                    strncat(base64_data, line_ptr, sizeof(base64_data) - strlen(base64_data) - 1);
+                }
+            }
+            line_ptr = strtok(NULL, "\n");
+        }
+        free(message_copy);
+        
+        if (!found_begin) {
+            fprintf(stderr, "Error: Invalid message format - missing BEGIN header\n");
+            return 1;
+        }
+    } else {
+        fprintf(stderr, "Error: No encrypted message provided\n");
+        return 1;
+    }
+    
+    // Now we have the pad chksum from the message, construct filename
+    char pad_path[MAX_HASH_LENGTH + 20];
+    char state_path[MAX_HASH_LENGTH + 20];
+    get_pad_path(stored_chksum, pad_path, state_path);
+    
+    // Check if we have this pad
+    if (access(pad_path, R_OK) != 0) {
+        fprintf(stderr, "Error: Required pad not found: %s\n", stored_chksum);
+        return 1;
+    }
+    
+    // Verify pad integrity (silent check)
+    if (calculate_checksum(pad_path, current_chksum) != 0) {
+        fprintf(stderr, "Error: Cannot calculate current pad checksum\n");
+        return 1;
+    }
+    
+    if (strcmp(stored_chksum, current_chksum) != 0) {
+        fprintf(stderr, "Error: Pad integrity check failed!\n");
+        return 1;
+    }
+    
+    // Decode base64
+    int ciphertext_len;
+    unsigned char* ciphertext = custom_base64_decode(base64_data, &ciphertext_len);
+    if (!ciphertext) {
+        fprintf(stderr, "Error: Invalid base64 data\n");
+        return 1;
+    }
+    
+    // Read pad data at specified offset
+    FILE* pad_file = fopen(pad_path, "rb");
+    if (!pad_file) {
+        fprintf(stderr, "Error: Cannot open pad file %s\n", pad_path);
+        free(ciphertext);
+        return 1;
+    }
+    
+    if (fseek(pad_file, pad_offset, SEEK_SET) != 0) {
+        fprintf(stderr, "Error: Cannot seek to offset %lu in pad file\n", pad_offset);
+        free(ciphertext);
+        fclose(pad_file);
+        return 1;
+    }
+    
+    unsigned char* pad_data = malloc(ciphertext_len);
+    if (fread(pad_data, 1, ciphertext_len, pad_file) != (size_t)ciphertext_len) {
+        fprintf(stderr, "Error: Cannot read pad data\n");
+        free(ciphertext);
+        free(pad_data);
+        fclose(pad_file);
+        return 1;
+    }
+    fclose(pad_file);
+    
+    // XOR decrypt
+    char* plaintext = malloc(ciphertext_len + 1);
+    for (int i = 0; i < ciphertext_len; i++) {
+        plaintext[i] = ciphertext[i] ^ pad_data[i];
+    }
+    plaintext[ciphertext_len] = '\0';
+    
+    // Output only the decrypted text - no extra messages
+    printf("%s\n", plaintext);
+    
+    // Cleanup
+    free(ciphertext);
+    free(pad_data);
+    free(plaintext);
+    
+    return 0;
+}
+
 int encrypt_file(const char* pad_identifier, const char* input_file, const char* output_file, int ascii_armor) {
     char* pad_chksum = find_pad_by_prefix(pad_identifier);
     if (!pad_chksum) {
@@ -2395,36 +2561,154 @@ int pipe_mode(int argc, char* argv[], const char* piped_text) {
     (void)argc; // Suppress unused parameter warning
     (void)argv; // Suppress unused parameter warning
     
-    printf("Piped text received: \"%s\"\n\n", piped_text);
+    // Check if we have a default pad configured
+    char* default_pad = get_default_pad_path();
+    if (default_pad) {
+        // Verify the default pad exists and extract checksum
+        if (access(default_pad, R_OK) == 0) {
+            // Extract checksum from pad filename
+            char* filename = strrchr(default_pad, '/');
+            if (!filename) filename = default_pad;
+            else filename++; // Skip the '/'
             
-    // List available pads for selection
-    int pad_count = list_available_pads();
-    if (pad_count == 0) {
-        printf("No pads available. Generate a pad first.\n");
+            // Extract checksum (remove .pad extension)
+            if (strlen(filename) >= 68 && strstr(filename, ".pad")) {
+                char pad_checksum[65];
+                strncpy(pad_checksum, filename, 64);
+                pad_checksum[64] = '\0';
+                
+                free(default_pad);
+                
+                // Encrypt using the default pad (silent mode)
+                return encrypt_text(pad_checksum, piped_text);
+            }
+        }
+        
+        fprintf(stderr, "Error: Default pad not found or invalid: %s\n", default_pad);
+        free(default_pad);
         return 1;
     }
     
-    // Reopen stdin from the controlling terminal for interactive input
-    FILE* tty = fopen("/dev/tty", "r");
-    if (!tty) {
-        printf("Error: Cannot open terminal for input\n");
+    fprintf(stderr, "Error: No default pad configured for pipe mode\n");
+    fprintf(stderr, "Configure a default pad in ~/.otp/otp.conf\n");
+    return 1;
+}
+
+// Preferences management functions implementation
+int load_preferences(void) {
+    char* home_dir = getenv("HOME");
+    if (!home_dir) {
+        return 1; // No home directory
+    }
+    
+    char preferences_dir[1024];
+    char preferences_file[1024];
+    snprintf(preferences_dir, sizeof(preferences_dir), "%s/.otp", home_dir);
+    snprintf(preferences_file, sizeof(preferences_file), "%s/otp.conf", preferences_dir);
+    
+    FILE* file = fopen(preferences_file, "r");
+    if (!file) {
+        return 0; // No preferences file, use defaults
+    }
+    
+    char line[1024];
+    while (fgets(line, sizeof(line), file)) {
+        // Remove newline
+        line[strcspn(line, "\n")] = 0;
+        
+        // Skip empty lines and comments
+        if (strlen(line) == 0 || line[0] == '#') {
+            continue;
+        }
+        
+        // Parse key=value pairs
+        char* equals = strchr(line, '=');
+        if (equals) {
+            *equals = '\0';
+            char* key = line;
+            char* value = equals + 1;
+            
+            // Trim whitespace
+            while (*key == ' ' || *key == '\t') key++;
+            while (*value == ' ' || *value == '\t') value++;
+            
+            if (strcmp(key, "default_pad") == 0) {
+                strncpy(default_pad_path, value, sizeof(default_pad_path) - 1);
+                default_pad_path[sizeof(default_pad_path) - 1] = '\0';
+            }
+        }
+    }
+    
+    fclose(file);
+    return 0;
+}
+
+int save_preferences(void) {
+    char* home_dir = getenv("HOME");
+    if (!home_dir) {
         return 1;
     }
     
-    printf("\nEnter pad selection (number, checksum, or prefix): ");
-    fflush(stdout);
+    char preferences_dir[1024];
+    char preferences_file[1024];
+    snprintf(preferences_dir, sizeof(preferences_dir), "%s/.otp", home_dir);
+    snprintf(preferences_file, sizeof(preferences_file), "%s/otp.conf", preferences_dir);
     
-    char pad_input[MAX_HASH_LENGTH];
-    if (!fgets(pad_input, sizeof(pad_input), tty)) {
-        printf("Error: Failed to read pad selection\n");
-        fclose(tty);
+    // Create .otp directory if it doesn't exist
+    struct stat st = {0};
+    if (stat(preferences_dir, &st) == -1) {
+        if (mkdir(preferences_dir, 0755) != 0) {
+            return 1;
+        }
+    }
+    
+    FILE* file = fopen(preferences_file, "w");
+    if (!file) {
         return 1;
     }
-    pad_input[strcspn(pad_input, "\n")] = 0;
-    fclose(tty);
     
-    // Encrypt the piped text
-    return encrypt_text(pad_input, piped_text);
+    fprintf(file, "# OTP Preferences File\n");
+    fprintf(file, "# This file is automatically generated and updated by the OTP program\n\n");
+    
+    if (strlen(default_pad_path) > 0) {
+        fprintf(file, "default_pad=%s\n", default_pad_path);
+    }
+    
+    fclose(file);
+    return 0;
+}
+
+char* get_preference(const char* key) {
+    if (strcmp(key, "default_pad") == 0) {
+        if (strlen(default_pad_path) > 0) {
+            return strdup(default_pad_path);
+        }
+    }
+    return NULL;
+}
+
+int set_preference(const char* key, const char* value) {
+    if (strcmp(key, "default_pad") == 0) {
+        if (value) {
+            strncpy(default_pad_path, value, sizeof(default_pad_path) - 1);
+            default_pad_path[sizeof(default_pad_path) - 1] = '\0';
+        } else {
+            default_pad_path[0] = '\0';
+        }
+        return save_preferences();
+    }
+    return 1;
+}
+
+char* get_default_pad_path(void) {
+    if (strlen(default_pad_path) > 0) {
+        return strdup(default_pad_path);
+    }
+    return NULL;
+}
+
+int set_default_pad_path(const char* pad_path) {
+    return set_preference("default_pad", pad_path);
 }
 
 // OTP thumb drive detection function implementation