# HG changeset patch
# User Nate Karstens <nate.karstens@garmin.com>
# Date 1501265787 18000
# Fri Jul 28 13:16:27 2017 -0500
# Node ID 7e10e1dc1fae0f538a0a74fd6783f9b33a905933
# Parent 72d3aefc2993a639cc8cddc94aefc7c4390ee252
Core: add function to decode hexadecimal strings.

Adds functionality to convert a hexadecimal string into binary data.
This will be used to decode PSKs stored in hexadecimal representation.

Signed-off-by: Nate Karstens <nate.karstens@garmin.com>

diff -r 72d3aefc2993 -r 7e10e1dc1fae src/core/ngx_string.c
--- a/src/core/ngx_string.c Wed Jul 26 13:13:51 2017 +0300
+++ b/src/core/ngx_string.c Fri Jul 28 13:16:27 2017 -0500
@@ -1104,6 +1104,54 @@ ngx_hextoi(u_char *line, size_t n)
}


+ngx_int_t
+ngx_hex_decode(u_char *dst, size_t dlen, u_char *src, size_t slen)
+{
+ u_char c, ch;
+ ngx_int_t len;
+
+ if ((slen & 1) || (dlen < (slen / 2))) {
+ return NGX_ERROR;
+ }
+
+ len = slen / 2;
+
+ while (slen > 0) {
+ ch = *src;
+ c = (u_char) (ch | 0x20);
+
+ if (ch >= '0' && ch <= '9') {
+ *dst = ch - '0';
+ } else if (c >= 'a' && c <= 'f') {
+ *dst = c - 'a' + 10;
+ } else {
+ return NGX_ERROR;
+ }
+
+ *dst <<= 4;
+ src++;
+
+ ch = *src;
+ c = (u_char) (ch | 0x20);
+
+ if (ch >= '0' && ch <= '9') {
+ *dst |= ch - '0';
+ } else if (c >= 'a' && c <= 'f') {
+ *dst |= c - 'a' + 10;
+ } else {
+ return NGX_ERROR;
+ }
+
+ dst++;
+ src++;
+
+ slen -= 2;
+ }
+
+ return len;
+}
+
+
u_char *
ngx_hex_dump(u_char *dst, u_char *src, size_t len)
{
diff -r 72d3aefc2993 -r 7e10e1dc1fae src/core/ngx_string.h
--- a/src/core/ngx_string.h Wed Jul 26 13:13:51 2017 +0300
+++ b/src/core/ngx_string.h Fri Jul 28 13:16:27 2017 -0500
@@ -176,6 +176,7 @@ off_t ngx_atoof(u_char *line, size_t n);
time_t ngx_atotm(u_char *line, size_t n);
ngx_int_t ngx_hextoi(u_char *line, size_t n);

+ngx_int_t ngx_hex_decode(u_char *dst, size_t dlen, u_char *src, size_t slen);
u_char *ngx_hex_dump(u_char *dst, u_char *src, size_t len);



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