diff --git a/Makefile.am b/Makefile.am
index 4f335e8..dad5bff 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,7 +5,8 @@ lib_LTLIBRARIES = \
 
 libblkmaker_@LIBBLKMAKER_API_VERSION@_la_SOURCES = \
 	blkmaker.c \
-	blktemplate.c
+	blktemplate.c \
+	hex.c
 
 libblkmaker_@LIBBLKMAKER_API_VERSION@_la_LDFLAGS = -version-info $(LIBBLKMAKER_SO_VERSION) -no-undefined
 
diff --git a/blkmaker_jansson.c b/blkmaker_jansson.c
index 4312f63..d053b20 100644
--- a/blkmaker_jansson.c
+++ b/blkmaker_jansson.c
@@ -14,6 +14,8 @@
 #include <blkmaker.h>
 #include <blktemplate.h>
 
+#include "private.h"
+
 #ifndef JSON_INTEGER_IS_LONG_LONG
 #	error "Jansson 2.0 with long long support required!"
 #endif
@@ -80,38 +82,7 @@ err:
 }
 
 
-static bool my_hex2bin(void *o, const char *x, size_t len) {
-	unsigned char *oc = o;
-	unsigned char c, hc = 0x10;
-	len *= 2;
-	while (len)
-	{
-		switch (x[0]) {
-		case '0': case '1': case '2': case '3': case '4':
-		case '5': case '6': case '7': case '8': case '9':
-			c = x[0] - '0';
-			break;
-		case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
-			c = x[0] - 'A' + 10;
-			break;
-		case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
-			c = x[0] - 'a' + 10;
-			break;
-		default:
-			return false;
-		}
-		++x;
-		if (hc < 0x10)
-		{
-			(oc++)[0] = (hc << 4) | c;
-			hc = 0x10;
-		}
-		else
-			hc = c;
-		--len;
-	}
-	return !x[0];
-}
+#define my_hex2bin _blkmk_hex2bin
 
 #define GET(key, type)  do {  \
 	if (!(v = json_object_get(json, #key)))  \
@@ -294,17 +265,7 @@ char varintEncode(unsigned char *out, uint64_t n) {
 	return L;
 }
 
-static
-void my_bin2hex(char *out, const void *data, size_t datasz) {
-	const unsigned char *datac = data;
-	static char hex[] = "0123456789abcdef";
-	out[datasz * 2] = '\0';
-	for (size_t i = 0; i < datasz; ++i)
-	{
-		out[ i*2   ] = hex[datac[i] >> 4];
-		out[(i*2)+1] = hex[datac[i] & 15];
-	}
-}
+#define my_bin2hex _blkmk_bin2hex
 
 json_t *blkmk_submit_jansson(blktemplate_t *tmpl, const unsigned char *data, unsigned int dataid, blknonce_t nonce) {
 	unsigned char blk[80 + 8 + 1000000];
diff --git a/hex.c b/hex.c
new file mode 100644
index 0000000..0607bfe
--- /dev/null
+++ b/hex.c
@@ -0,0 +1,47 @@
+#include <string.h>
+
+#include <stdbool.h>
+
+bool _blkmk_hex2bin(void *o, const char *x, size_t len) {
+	unsigned char *oc = o;
+	unsigned char c, hc = 0x10;
+	len *= 2;
+	while (len)
+	{
+		switch (x[0]) {
+		case '0': case '1': case '2': case '3': case '4':
+		case '5': case '6': case '7': case '8': case '9':
+			c = x[0] - '0';
+			break;
+		case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+			c = x[0] - 'A' + 10;
+			break;
+		case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+			c = x[0] - 'a' + 10;
+			break;
+		default:
+			return false;
+		}
+		++x;
+		if (hc < 0x10)
+		{
+			(oc++)[0] = (hc << 4) | c;
+			hc = 0x10;
+		}
+		else
+			hc = c;
+		--len;
+	}
+	return !x[0];
+}
+
+void _blkmk_bin2hex(char *out, const void *data, size_t datasz) {
+	const unsigned char *datac = data;
+	static char hex[] = "0123456789abcdef";
+	out[datasz * 2] = '\0';
+	for (size_t i = 0; i < datasz; ++i)
+	{
+		out[ i*2   ] = hex[datac[i] >> 4];
+		out[(i*2)+1] = hex[datac[i] & 15];
+	}
+}
diff --git a/private.h b/private.h
new file mode 100644
index 0000000..08e5a1c
--- /dev/null
+++ b/private.h
@@ -0,0 +1,11 @@
+#ifndef BLKMK_PRIVATE_H
+#define BLKMK_PRIVATE_H
+
+#include <stdbool.h>
+#include <string.h>
+
+// hex.c
+extern void _blkmk_bin2hex(char *out, const void *data, size_t datasz);
+extern bool _blkmk_hex2bin(void *o, const char *x, size_t len);
+
+#endif