IN char * pszMethod,      /* method from the request */
    IN char * pszDigestUri,   /* requested URL */
    IN HASHHEX HEntity,       /* H(entity body) if qop="auth-int" */
    OUT HASHHEX Response      /* request-digest or response-digest */
    );

File "digcalc.c":

#include 
#include 




 
RFC 2617                  HTTP Authentication                  June 1999


#include 
#include "digcalc.h"

void CvtHex(
    IN HASH Bin,
    OUT HASHHEX Hex
    )
{
    unsigned short i;
    unsigned char j;

    for (i = 0; i < HASHLEN; i++) {
        j = (Bin[i] >> 4) & 0xf;
        if (j <= 9)
            Hex[i*2] = (j + '0');
         else
            Hex[i*2] = (j + 'a' - 10);
        j = Bin[i] & 0xf;
        if (j <= 9)
            Hex[i*2+1] = (j + '0');
         else
            Hex[i*2+1] = (j + 'a' - 10);
    };
    Hex[HASHHEXLEN] = '\0';
};

/* calculate H(A1) as per spec */
void DigestCalcHA1(
    IN char * pszAlg,
    IN char * pszUserName,
    IN char * pszRealm,
    IN char * pszPassword,
    IN char * pszNonce,
    IN char * pszCNonce,
    OUT HASHHEX SessionKey
    )
{
      MD5_CTX Md5Ctx;
      HASH HA1;

      MD5Init(&Md5Ctx);
      MD5Update(&Md5Ctx, pszUserName, strlen(pszUserName));
      MD5Update(&Md5Ctx, ":", 1);
      MD5Update(&Md5Ctx, pszRealm, strlen(pszRealm));
      MD5Update(&Md5Ctx, ":", 1);
      MD5Update(&Md5Ctx, pszPassword, strlen(pszPassword));
      MD5Final(HA1, &Md5Ctx);
      if (stricmp(pszAlg, "md5-sess") == 0) {




 
RFC 2617                  HTTP Authentication                  June 1999


            MD5Init(&Md5Ctx);
            MD5Update(&Md5Ctx, HA1, HASHLEN);
            MD5Update(&Md5Ctx, ":", 1);
            MD5Update(&Md5Ctx, pszNonce, strlen(pszNonce));
            MD5Update(&Md5Ctx, ":", 1);
            MD5Update(&Md5Ctx, pszCNonce, strlen(pszCNonce));
            MD5Final(HA1, &Md5Ctx);
      };
      CvtHex(HA1, SessionKey);
};

/* calculate request-digest/response-digest as per HTTP Digest spec */
void DigestCalcResponse(
    IN HASHHEX HA1,           /* H(A1) */
    IN char * pszNonce,       /* nonce from server */
    IN char * pszNonceCount,  /* 8 hex digits */
    IN char * pszCNonce,      /* client nonce */
    IN char * pszQop,         /* qop-value: "", "auth", "auth-int" */
    IN char * pszMethod,      /* method from the request */
    IN char * pszDigestUri,   /* requested URL */
    IN HASHHEX HEntity,       /* H(entity body) if qop="auth-int" */
    OUT HASHHEX Response      /* request-digest or response-digest */
    )
{
      MD5_CTX Md5Ctx;
      HASH HA2;