curl_des.c
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22 
23 #include "curl_setup.h"
24 
25 #if defined(USE_NTLM) && !defined(USE_OPENSSL)
26 
27 #include "curl_des.h"
28 
29 /*
30  * Curl_des_set_odd_parity()
31  *
32  * This is used to apply odd parity to the given byte array. It is typically
33  * used by when a cryptography engines doesn't have it's own version.
34  *
35  * The function is a port of the Java based oddParity() function over at:
36  *
37  * https://davenport.sourceforge.io/ntlm.html
38  *
39  * Parameters:
40  *
41  * bytes [in/out] - The data whose parity bits are to be adjusted for
42  * odd parity.
43  * len [out] - The length of the data.
44  */
45 void Curl_des_set_odd_parity(unsigned char *bytes, size_t len)
46 {
47  size_t i;
48 
49  for(i = 0; i < len; i++) {
50  unsigned char b = bytes[i];
51 
52  bool needs_parity = (((b >> 7) ^ (b >> 6) ^ (b >> 5) ^
53  (b >> 4) ^ (b >> 3) ^ (b >> 2) ^
54  (b >> 1)) & 0x01) == 0;
55 
56  if(needs_parity)
57  bytes[i] |= 0x01;
58  else
59  bytes[i] &= 0xfe;
60  }
61 }
62 
63 #endif /* USE_NTLM && !USE_OPENSSL */
i
unsigned int i
Definition: unit1303.c:79
len
size_t len
Definition: curl_sasl.c:55
curl_setup.h
curl_des.h

rc_tagdetect_client
Author(s): Monika Florek-Jasinska , Raphael Schaller
autogenerated on Sat Feb 13 2021 03:42:08