1 files changed, 5 insertions, 7 deletions
diff --git a/crypto/x509v3/v3_utl.c b/crypto/x509v3/v3_utl.c
index ae9645d687..a5016bad76 100644
--- a/crypto/x509v3/v3_utl.c
+++ b/crypto/x509v3/v3_utl.c
@@ -1177,19 +1177,17 @@ static int ipv6_hex(unsigned char *out, const char *in, int inlen)
 {
     unsigned char c;
     unsigned int num = 0;
+    int x;
+
     if (inlen > 4)
         return 0;
     while (inlen--) {
         c = *in++;
         num <<= 4;
-        if ((c >= '0') && (c <= '9'))
-            num |= c - '0';
-        else if ((c >= 'A') && (c <= 'F'))
-            num |= c - 'A' + 10;
-        else if ((c >= 'a') && (c <= 'f'))
-            num |= c - 'a' + 10;
-        else
+        x = OPENSSL_hexchar2int(c);
+        if (x < 0)
             return 0;
+        num |= (char)x;
     }
     out[0] = num >> 8;
     out[1] = num & 0xff;