#define HASHLEN 16
typedef char HASH[HASHLEN];
#define HASHHEXLEN 32
typedef char HASHHEX[HASHHEXLEN+1];
#define IN
#define OUT
/* calculate H(A1) as per HTTP Digest spec */
void DigestCalcHA1 (IN const char *pszAlg,
               IN const char *pszUserName,
               IN const char *pszRealm,
               IN const char *pszPassword,
               IN const char *pszNonce,
               IN const char *pszCNonce,
               OUT HASHHEX SessionKey);
/* calculate request-digest/response-digest as per HTTP Digest spec */
void DigestCalcResponse (IN HASHHEX HA1,     /* H(A1) */
                    IN const char *pszNonce,    /* nonce from server */
                    IN const char *pszNonceCount,       /* 8 hex digits */
                    IN const char *pszCNonce,   /* client nonce */
                    IN const char *pszQop,      /* qop-value: "", "auth", "auth-int" */
                    IN int Aka, /* Calculating AKAv1-MD5 response */
                    IN const char *pszMethod,   /* method from the request */
                    IN const char *pszDigestUri,        /* requested URL */
                    IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */
                    OUT HASHHEX Response
                    /* request-digest or response-digest */ );