From: Mimi Zohar Subject: [PATCH v1.5 1/5] lib: hex2bin converts ascii hexadecimal string to binary Date: Tue, 23 Nov 2010 18:43:14 -0500 Message-ID: <1290555794.2604.12.camel@localhost.localdomain> References: <1290552635-3356-1-git-send-email-zohar@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: linux-security-module@vger.kernel.org, keyrings@linux-nfs.org, linux-crypto@vger.kernel.org, David Howells , Jason Gunthorpe , James Morris , David Safford , Rajiv Andrade To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <1290552635-3356-1-git-send-email-zohar@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org Similar to the kgdb_hex2mem() code, hex2bin converts a string to binary using the hex_to_bin() library call. Changelog: - Replace parameter names with src/dst (based on David Howell's comment) - Add 'const' where needed (based on David Howell's comment) - Replace int with size_t (based on David Howell's comment) Signed-off-by: Mimi Zohar Acked-by: Serge E. Hallyn Acked-by: David Howells --- include/linux/kernel.h | 1 + lib/hexdump.c | 16 ++++++++++++++++ 2 files changed, 17 insertions(+), 0 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 3f648d2..fbca217 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -419,6 +419,7 @@ static inline char *pack_hex_byte(char *buf, u8 byte) } extern int hex_to_bin(char ch); +extern void hex2bin(u8 *dst, const char *src, size_t count); #ifndef pr_fmt #define pr_fmt(fmt) fmt diff --git a/lib/hexdump.c b/lib/hexdump.c index 5d7a480..b66b2bd 100644 --- a/lib/hexdump.c +++ b/lib/hexdump.c @@ -34,6 +34,22 @@ int hex_to_bin(char ch) EXPORT_SYMBOL(hex_to_bin); /** + * hex2bin - convert an ascii hexadecimal string to its binary representation + * @dst: binary result + * @src: ascii hexadecimal string + * @count: result length + */ +void hex2bin(u8 *dst, const char *src, size_t count) +{ + while (count--) { + *dst = hex_to_bin(*src++) << 4; + *dst += hex_to_bin(*src++); + dst++; + } +} +EXPORT_SYMBOL(hex2bin); + +/** * 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 -- 1.7.2.2