Provide a binary to hex conversion function

Provide a function to convert a buffer of binary data into an unterminated
ascii hex string representation of that data.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>

2 files changed, 17 insertions, 0 deletions

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 4c52907a6d8b..89a0b8e5a952 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -500,6 +500,7 @@ static inline char * __deprecated pack_hex_byte(char *buf, u8 byte)
 
 extern int hex_to_bin(char ch);
 extern int __must_check hex2bin(u8 *dst, const char *src, size_t count);
+extern char *bin2hex(char *dst, const void *src, size_t count);
 
 int mac_pton(const char *s, u8 *mac);
 
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 8499c810909a..270773b91923 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -59,6 +59,22 @@ int hex2bin(u8 *dst, const char *src, size_t count)
 EXPORT_SYMBOL(hex2bin);
 
 /**
+ * bin2hex - convert binary data to an ascii hexadecimal string
+ * @dst: ascii hexadecimal result
+ * @src: binary data
+ * @count: binary data length
+ */
+char *bin2hex(char *dst, const void *src, size_t count)
+{
+        const unsigned char *_src = src;
+
+        while (count--)
+                dst = hex_byte_pack(dst, *_src++);
+        return dst;
+}
+EXPORT_SYMBOL(bin2hex);
+
+/**
  * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
  * @buf: data blob to dump
  * @len: number of bytes in the @buf