linux-kernel - [PATCH 01/13] Provide a binary to hex conversion utility

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Message-ID: <20140908153715.28301.37329.stgit@warthog.procyon.org.uk>
Date:	Mon, 08 Sep 2014 16:37:15 +0100
From:	David Howells <dhowells@...hat.com>
To:	rusty@...tcorp.com.au
Cc:	keyrings@...ux-nfs.org, jwboyer@...hat.com,
	linux-kernel@...r.kernel.org, dhowells@...hat.com,
	linux-security-module@...r.kernel.org, pjones@...hat.com,
	vgoyal@...hat.com
Subject: [PATCH 01/13] Provide a binary to hex conversion utility

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

Signed-off-by: David Howells <dhowells@...hat.com>
---

 include/linux/kernel.h |    1 +
 lib/hexdump.c          |   18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 95624bed87ef..7c0ad8e38510 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -496,6 +496,7 @@ static inline char *hex_byte_pack_upper(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);
 
 bool mac_pton(const char *s, u8 *mac);
 
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 8499c810909a..6daf254dddfa 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -59,6 +59,24 @@ 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)
+{
+	while (count--) {
+		unsigned char ch = *(const unsigned char *)src;
+		*dst++ = hex_asc[ch >> 4];
+		*dst++ = hex_asc[ch & 0xf];
+		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

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