From 242430d5e52cf8ee49dcd1701cf134e7454910c6 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Sat, 9 Feb 2019 18:20:57 +0100 Subject: Change license to ISC and reorganise MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- unhex.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 unhex.c (limited to 'unhex.c') diff --git a/unhex.c b/unhex.c new file mode 100644 index 0000000..0dc231d --- /dev/null +++ b/unhex.c @@ -0,0 +1,26 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +/** + * Convert a hexadecimal hashsum (both lower case, upper + * case and mixed is supported) to binary representation + * + * @param output Output array, should have an allocation + * size of at least `strlen(hashsum) / 2` + * @param hashsum The hashsum to convert + */ +void +libsha2_unhex(char *restrict output, const char *restrict hashsum) +{ + size_t n = strlen(hashsum) / 2; + while (n--) { + char a = hashsum[2 * n + 0]; + char b = hashsum[2 * n + 1]; + + a = (char)((a & 15) + (a > '9' ? 9 : 0)); + b = (char)((b & 15) + (b > '9' ? 9 : 0)); + + output[n] = (char)((a << 4) | b); + } +} -- cgit v1.2.3-70-g09d2