3 files changed, 5 insertions, 4 deletions
diff --git a/b32.c b/b32.c
index 1503bf5..1c50aa5 100644
--- a/b32.c
+++ b/b32.c
@@ -22,7 +22,7 @@ static const uint8_t ctov[] = {
 };
 
 bool
-b32toa(char *dst, const char *src, size_t len)
+b32toa(uint8_t *dst, const char *src, size_t len)
 {
 	char c;
 	size_t pad = 0;
@@ -37,7 +37,7 @@ b32toa(char *dst, const char *src, size_t len)
 		for (size_t j = 0; j < 8; j++) {
 			c = src[i + j];
 			vs[j] = ctov[(uint8_t)c];
-			if (vs[j] == 255) {
+			if (vs[j] == (uint8_t)-1) {
 				if (c == '=' && j >= 8 - pad)
 					vs[j] = 0;
 				else
diff --git a/b32.h b/b32.h
index 090b39f..1555dd2 100644
--- a/b32.h
+++ b/b32.h
@@ -2,7 +2,8 @@
 #define B32_B32_H
 
 #include <stdbool.h>
+#include <stdint.h>
 
-bool b32toa(char *, const char *, size_t);
+bool b32toa(uint8_t *, const char *, size_t);
 
 #endif
diff --git a/main.c b/main.c
index a69c7dd..d7d3d2d 100644
--- a/main.c
+++ b/main.c
@@ -186,7 +186,7 @@ bool
 totp(struct totp_config conf, uint32_t *code)
 {
 	int off;
-	char *key;
+	uint8_t *key;
 	uchar *mac;
 	time_t epoch;
 	size_t keylen;