diff --git a/file.c b/file.c
index de2865a..ff380b6 100644
--- a/file.c
+++ b/file.c
@@ -20,6 +20,7 @@
 #include "archive.h"
 #include "file.h"
 #include "utils.h"
+#include "sha1.h"
 
 static char *mount_points[] = {
 	"app0:",
@@ -94,6 +95,59 @@ int getFileSize(char *pInputFileName)
 	return fileSize;
 }
 
+int getFileSha1(char *pInputFileName, uint8_t *pSha1Out, uint64_t *value, uint64_t max, void (* SetProgress)(uint64_t value, uint64_t max), int (* cancelHandler)()) {
+
+	// Set up SHA1 context	
+	SHA1_CTX ctx;
+	sha1_init(&ctx);
+
+	// Open the file to read, else return the error
+	SceUID fd = sceIoOpen(pInputFileName, SCE_O_RDONLY, 0);
+	if (fd < 0)
+		return fd;
+
+	// Open up the buffer for copying data into
+	void *buf = malloc(TRANSFER_SIZE);
+
+	int read;
+
+	// Actually take the SHA1 sum
+	while ((read = sceIoRead(fd, buf, TRANSFER_SIZE)) > 0)
+	{
+		sha1_update(&ctx, buf, read);
+
+		// Defined in io_process.c, check to make sure pointer isn't null before incrementing
+		if(value)
+			(*value)++; // Note: Max value is filesize/TRANSFER_SIZE
+
+		if(SetProgress)
+			SetProgress(value ? *value : 0, max);
+
+		// Check to see if cancelHandler exists, if so call it and free memory if cancelled
+		if(cancelHandler && cancelHandler()) {
+			free(buf);
+			sceIoClose(fd);
+			return 0;
+		}
+
+		// This is CPU intensive so the progress bar won't refresh unless we sleep
+		// DIALOG_WAIT seemed too long for this application
+		// so I set it to 1/2 of a second every 8192 TRANSFER_SIZE blocks
+		if((*value)%8192 == 0)
+			sceKernelDelayThread(500000);
+	}
+
+	// Final iteration of SHA1 sum, dump final value into pSha1Out buffer
+	sha1_final(&ctx, pSha1Out);
+
+	// Free up file buffer
+	free(buf);
+
+	// Close file proper
+	sceIoClose(fd);
+	return 1;
+}
+
 int getPathInfo(char *path, uint64_t *size, uint32_t *folders, uint32_t *files) {
 	SceUID dfd = sceIoDopen(path);
 	if (dfd >= 0) {
diff --git a/file.h b/file.h
index d1e3449..dc2961e 100644
--- a/file.h
+++ b/file.h
@@ -79,6 +79,7 @@ int ReadFile(char *file, void *buf, int size);
 int WriteFile(char *file, void *buf, int size);
 
 int getFileSize(char *pInputFileName);
+int getFileSha1(char *pInputFileName, uint8_t *pSha1Out, uint64_t *value, uint64_t max, void (*SetProgress)(uint64_t value, uint64_t max), int (* cancelHandler)());
 int getPathInfo(char *path, uint64_t *size, uint32_t *folders, uint32_t *files);
 int removePath(char *path, uint64_t *value, uint64_t max, void (* SetProgress)(uint64_t value, uint64_t max), int (* cancelHandler)());
 int copyFile(char *src_path, char *dst_path, uint64_t *value, uint64_t max, void (* SetProgress)(uint64_t value, uint64_t max), int (* cancelHandler)());
diff --git a/io_process.c b/io_process.c
index b63017e..9018731 100644
--- a/io_process.c
+++ b/io_process.c
@@ -319,4 +319,72 @@ EXIT:
 	powerUnlock();
 
 	return sceKernelExitDeleteThread(0);
-}
\ No newline at end of file
+}
+
+int hash_thread(SceSize args_size, HashArguments *args) {
+	SceUID thid = -1;
+
+	// Lock power timers
+	powerLock();
+
+	// Set progress to 0%
+	sceMsgDialogProgressBarSetValue(SCE_MSG_DIALOG_PROGRESSBAR_TARGET_BAR_DEFAULT, 0);
+	sceKernelDelayThread(DIALOG_WAIT); // Needed to see the percentage
+
+	uint64_t max = (uint64_t) (getFileSize(args->file_path)/(TRANSFER_SIZE));
+
+	// SHA1 process
+	uint64_t value = 0;
+
+	// Spin off a thread to update the progress dialog 
+	thid = createStartUpdateThread(max);
+
+	uint8_t sha1out[20];
+	int res = getFileSha1(args->file_path, sha1out, &value, max, SetProgress, cancelHandler);
+	if (res <= 0) {
+		// SHA1 Didn't complete successfully, or was cancelled
+		closeWaitDialog();
+		dialog_step = DIALOG_STEP_CANCELLED;
+		errorDialog(res);
+		goto EXIT;
+	}
+
+	// Since we hit here, we're done. Set progress to 100%
+	sceMsgDialogProgressBarSetValue(SCE_MSG_DIALOG_PROGRESSBAR_TARGET_BAR_DEFAULT, 100);
+	sceKernelDelayThread(COUNTUP_WAIT);
+
+	// Close
+	closeWaitDialog();
+
+	char sha1msg[41];
+	int i;
+
+	// Construct SHA1 sum string
+	for (i = 0; i < 20; i++) {
+		sprintf(sha1msg + (2*i), "%02x ", sha1out[i]);
+	}
+
+	sha1msg[40] = '\0';
+
+	initMessageDialog(SCE_MSG_DIALOG_BUTTON_TYPE_OK, sha1msg);
+	dialog_step = DIALOG_STEP_HASH_DISPLAY;
+
+	// Wait for response
+	while (dialog_step == DIALOG_STEP_HASH_DISPLAY) {
+		sceKernelDelayThread(1000);
+	}
+
+	closeWaitDialog();
+	sceMsgDialogClose();
+
+EXIT:
+
+	// Ensure the update thread ends gracefully
+	if(thid>=0)
+		sceKernelWaitThreadEnd(thid, NULL, NULL);
+
+	powerUnlock();
+
+	// Kill current thread
+	return sceKernelExitDeleteThread(0);
+}
diff --git a/io_process.h b/io_process.h
index 960d936..59a3ba2 100644
--- a/io_process.h
+++ b/io_process.h
@@ -45,6 +45,10 @@ typedef struct {
 	int copy_mode;
 } CopyArguments;
 
+typedef struct {
+	char *file_path;
+} HashArguments;
+
 void closeWaitDialog();
 int cancelHandler();
 void SetProgress(uint64_t value, uint64_t max);
@@ -52,5 +56,6 @@ SceUID createStartUpdateThread(uint64_t max);
 
 int delete_thread(SceSize args_size, DeleteArguments *args);
 int copy_thread(SceSize args_size, CopyArguments *args);
+int hash_thread(SceSize args_size, HashArguments *args);
 
-#endif
\ No newline at end of file
+#endif
diff --git a/language.c b/language.c
index e297428..4aa8623 100644
--- a/language.c
+++ b/language.c
@@ -98,6 +98,9 @@ void loadLanguage(int id) {
 		LANGUAGE_ENTRY(SYS_INFO),
 		LANGUAGE_ENTRY(INSTALL_ALL),
 		LANGUAGE_ENTRY(UPDATE_QUESTION),
+		LANGUAGE_ENTRY(SHA1),
+		LANGUAGE_ENTRY(HASHING),
+		LANGUAGE_ENTRY(HASH_FILE_QUESTION),
 	};
 
 	// Load default config file
diff --git a/language.h b/language.h
index ba005c1..8dbb8d5 100644
--- a/language.h
+++ b/language.h
@@ -56,6 +56,9 @@ enum LanguageContainer {
 	SYS_INFO,
 	INSTALL_ALL,
 	UPDATE_QUESTION,
+	SHA1,
+	HASHING,
+	HASH_FILE_QUESTION,
 	LANGUAGE_CONTRAINER_SIZE,
 };
 
diff --git a/main.c b/main.c
index 48e1462..99a97f0 100644
--- a/main.c
+++ b/main.c
@@ -450,6 +450,7 @@ enum MenuEntrys {
 	MENU_ENTRY_RENAME,
 	MENU_ENTRY_EMPTY_4,
 	MENU_ENTRY_NEW_FOLDER,
+	MENU_ENTRY_SHA1,
 };
 
 enum MenuVisibilities {
@@ -475,6 +476,7 @@ MenuEntry menu_entries[] = {
 	{ RENAME, VISIBILITY_INVISIBLE },
 	{ -1, VISIBILITY_UNUSED },
 	{ NEW_FOLDER, VISIBILITY_INVISIBLE },
+	{ SHA1, VISIBILITY_INVISIBLE }
 };
 
 #define N_MENU_ENTRIES (sizeof(menu_entries) / sizeof(MenuEntry))
@@ -497,6 +499,7 @@ void initContextMenu() {
 		menu_entries[MENU_ENTRY_COPY].visibility = VISIBILITY_INVISIBLE;
 		menu_entries[MENU_ENTRY_DELETE].visibility = VISIBILITY_INVISIBLE;
 		menu_entries[MENU_ENTRY_RENAME].visibility = VISIBILITY_INVISIBLE;
+		menu_entries[MENU_ENTRY_SHA1].visibility = VISIBILITY_INVISIBLE;
 	}
 
 	// Invisible 'Paste' if nothing is copied yet
@@ -510,6 +513,11 @@ void initContextMenu() {
 		menu_entries[MENU_ENTRY_DELETE].visibility = VISIBILITY_INVISIBLE;
 		menu_entries[MENU_ENTRY_RENAME].visibility = VISIBILITY_INVISIBLE;
 		menu_entries[MENU_ENTRY_NEW_FOLDER].visibility = VISIBILITY_INVISIBLE;
+		menu_entries[MENU_ENTRY_SHA1].visibility  = VISIBILITY_INVISIBLE;
+	}
+
+	if(file_entry->is_folder) {
+		menu_entries[MENU_ENTRY_SHA1].visibility = VISIBILITY_INVISIBLE;
 	}
 
 	if(file_entry->type != FILE_TYPE_VPK) {
@@ -790,6 +798,14 @@ void contextMenuCtrl() {
 				dialog_step = DIALOG_STEP_NEW_FOLDER;
 				break;
 			}
+
+			case MENU_ENTRY_SHA1:
+			{
+				// Ensure user wants to actually take the hash
+				initMessageDialog(SCE_MSG_DIALOG_BUTTON_TYPE_YESNO, language_container[HASH_FILE_QUESTION]);
+				dialog_step = DIALOG_STEP_HASH_QUESTION;
+				break;
+			}
 			
 			case MENU_ENTRY_INSTALL_ALL:
 			{
@@ -982,7 +998,48 @@ int dialogSteps() {
 			}
 
 			break;
+
+		case DIALOG_STEP_HASH_QUESTION:
+			if (msg_result == MESSAGE_DIALOG_RESULT_YES) {
+				// Throw up the progress bar, enter hashing state
+				initMessageDialog(MESSAGE_DIALOG_PROGRESS_BAR, language_container[HASHING]);
+				dialog_step = DIALOG_STEP_HASH_CONFIRMED;
+			} else if (msg_result == MESSAGE_DIALOG_RESULT_NO) {
+				// Quit
+				dialog_step = DIALOG_STEP_NONE;
+			}
+
+			break;
+
+		case DIALOG_STEP_HASH_CONFIRMED:
+			if (msg_result == MESSAGE_DIALOG_RESULT_RUNNING) {
+				// User has confirmed desire to hash, get requested file entry
+				FileListEntry *file_entry = fileListGetNthEntry(&file_list, base_pos + rel_pos);
+
+				// Place the full file path in cur_file
+				snprintf(cur_file, MAX_PATH_LENGTH, "%s%s", file_list.path, file_entry->name);
+
+				HashArguments args;
+				args.file_path = cur_file;
+
+				// Create a thread to run out actual sum
+				SceUID thid = sceKernelCreateThread("hash_thread", (SceKernelThreadEntry)hash_thread, 0x40, 0x10000, 0, 0, NULL);
+				if (thid >= 0)
+					sceKernelStartThread(thid, sizeof(HashArguments), &args);
 			
+				dialog_step = DIALOG_STEP_HASHING;
+			}
+
+			break;
+
+		case DIALOG_STEP_HASH_DISPLAY:
+			// Reset dialog state when user selects yes/no
+			if (msg_result == MESSAGE_DIALOG_RESULT_NONE || msg_result == MESSAGE_DIALOG_RESULT_FINISHED) {
+				dialog_step = DIALOG_STEP_NONE;
+			}
+
+			break;
+
 		case DIALOG_STEP_INSTALL_QUESTION:
 			if (msg_result == MESSAGE_DIALOG_RESULT_YES) {
 				initMessageDialog(MESSAGE_DIALOG_PROGRESS_BAR, language_container[INSTALLING]);
diff --git a/main.h b/main.h
index 5aff1ee..9458c7b 100644
--- a/main.h
+++ b/main.h
@@ -179,6 +179,11 @@ enum DialogSteps {
 	DIALOG_STEP_DOWNLOADED,
 	DIALOG_STEP_EXTRACTING,
 	DIALOG_STEP_EXTRACTED,
+
+	DIALOG_STEP_HASH_QUESTION,
+	DIALOG_STEP_HASH_CONFIRMED,
+	DIALOG_STEP_HASHING,
+	DIALOG_STEP_HASH_DISPLAY,
 };
 
 extern vita2d_pgf *font;
diff --git a/resources/english_us.txt b/resources/english_us.txt
index 3732502..ac836cb 100644
--- a/resources/english_us.txt
+++ b/resources/english_us.txt
@@ -15,6 +15,9 @@ DELETE                               = "Delete"
 RENAME                               = "Rename"
 NEW_FOLDER                           = "New folder"
 FOLDER                               = "Folder"
+SHA1				     = "SHA1 checksum"
+HASHING				     = "Hashing..."
+HASH_FILE_QUESTION		     = "SHA1 hashing may take a long time. Continue?"
 COPIED_FILE                          = "Copied %d file."
 COPIED_FOLDER                        = "Copied %d folder."
 COPIED_FILES_FOLDERS                 = "Copied %d files/folders."