+
+int smemeq(const void *av, const void *bv, size_t len)
+{
+ const unsigned char *a = (const unsigned char *)av;
+ const unsigned char *b = (const unsigned char *)bv;
+ unsigned val = 0;
+
+ while (len-- > 0) {
+ val |= *a++ ^ *b++;
+ }
+ /* Now val is 0 iff we want to return 1, and in the range
+ * 0x01..0xFF iff we want to return 0. So subtracting from 0x100
+ * will clear bit 8 iff we want to return 0, and leave it set iff
+ * we want to return 1, so then we can just shift down. */
+ return (0x100 - val) >> 8;
+}
+
+int match_ssh_id(int stringlen, const void *string, const char *id)
+{
+ int idlen = strlen(id);
+ return (idlen == stringlen && !memcmp(string, id, idlen));
+}
+
+void *get_ssh_string(int *datalen, const void **data, int *stringlen)
+{
+ void *ret;
+ unsigned int len;
+
+ if (*datalen < 4)
+ return NULL;
+ len = GET_32BIT_MSB_FIRST((const unsigned char *)*data);
+ if (*datalen < len+4)
+ return NULL;
+ ret = (void *)((const char *)*data + 4);
+ *datalen -= len + 4;
+ *data = (const char *)*data + len + 4;
+ *stringlen = len;
+ return ret;
+}
+
+int get_ssh_uint32(int *datalen, const void **data, unsigned *ret)
+{
+ if (*datalen < 4)
+ return FALSE;
+ *ret = GET_32BIT_MSB_FIRST((const unsigned char *)*data);
+ *datalen -= 4;
+ *data = (const char *)*data + 4;
+ return TRUE;
+}