81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
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//+-----------------------------------------------------------------------
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//
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// Microsoft Windows
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//
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// Copyright (c) Microsoft Corporation 2000
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//
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// File: nonce.h
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//
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// Contents: Constants for the Nonce Generator/Validator
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//
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// History:
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// KDamour 21Mar00 Created
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//
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//------------------------------------------------------------------------
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#ifndef NTDIGEST_NONCE_H
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#define NTDIGEST_NONCE_H
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#include <wincrypt.h>
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// Handle into the CryptoAPI
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extern HCRYPTPROV g_hCryptProv;
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extern WORD g_SupportedCrypto;
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extern char *pbSeparator; // the COLON separator
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// NONCE FORMAT
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// rand-data = rand[16]
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// nonce_binary = time-stamp rand-data H(time-stamp ":" rand-data ":" nonce_private_key)
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// nonce = hex(nonce_binary)
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// SIZE implies number of ASCII chars
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// BYTESIZE is the number of bytes of Data (binary)
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#define NONCE_PRIVATE_KEY_BYTESIZE 16 // Generate 128 bit random private key
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#define RANDDATA_BYTESIZE 16 // # of random bytes at beginning of nonce
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#define TIMESTAMP_BYTESIZE sizeof(time_t) // size of timestamp in nonce binary 8 bytes
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#define MD5_HASH_BYTESIZE 16 // MD5 hash size
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#define MD5_HASH_HEX_SIZE (2*MD5_HASH_BYTESIZE) // BYTES needed to store a Hash as hex Encoded
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// For Hex encoding need 2chars per byte encoded
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#define NONCE_SIZE ((2*TIMESTAMP_BYTESIZE) + (2*RANDDATA_BYTESIZE) + (2*MD5_HASH_BYTESIZE))
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#define NONCE_TIME_LOC 0
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#define NONCE_RANDDATA_LOC (2 * TIMESTAMP_BYTESIZE)
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#define NONCE_HASH_LOC (NONCE_RANDDATA_LOC + (2 * RANDDATA_BYTESIZE))
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#define OPAQUE_RANDATA_SIZE 16 // Make 128bits of rand data for reference
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#define OPAQUE_SIZE (OPAQUE_RANDATA_SIZE * 2)
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#define MAX_URL_SIZE 512
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NTSTATUS NTAPI NonceInitialize(VOID);
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NTSTATUS NTAPI NonceCreate(OUT PSTRING pstrNonce);
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// Primary function to call to check validity of a nonce
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NTSTATUS NonceIsValid(PSTRING pstrNonce);
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// Helper function for NonceIsValid to check if time expired
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BOOL NonceIsExpired(PSTRING pstrNonce);
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// Helper function for NonceIsValid to check if Hash is correct
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BOOL NonceIsTampered(PSTRING pstrNonce);
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BOOL HashData(BYTE *pbData, DWORD cbData, BYTE *pbHash );
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// Create the Hash for the Nonce Parameters
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NTSTATUS NTAPI NonceHash( IN LPBYTE pbTime, IN DWORD cbTime,
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IN LPBYTE pbRandom, IN DWORD cbRandom,
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IN LPBYTE pbKey, IN DWORD cbKey,
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OUT LPBYTE pbHash);
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NTSTATUS NTAPI OpaqueCreate(IN OUT PSTRING pstrOpaque);
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// Set the bitmask for the supported crypto CSP installed
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NTSTATUS NTAPI SetSupportedCrypto(VOID);
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#endif
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