138 lines
3.9 KiB
C++
138 lines
3.9 KiB
C++
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// AuxHash.cpp -- Auxillary Hash class implementation
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// (c) Copyright Schlumberger Technology Corp., unpublished work, created
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// 1999. This computer program includes Confidential, Proprietary
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// Information and is a Trade Secret of Schlumberger Technology Corp. All
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// use, disclosure, and/or reproduction is prohibited unless authorized
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// in writing. All Rights Reserved.
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#include "NoWarning.h"
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#include "ForceLib.h"
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#include <malloc.h> // for _alloca
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#include <windows.h>
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#include <wincrypt.h>
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#include <scuOsExc.h>
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#include "AuxHash.h"
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/////////////////////////// HELPER /////////////////////////////////
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/////////////////////////// LOCAL VAR /////////////////////////////////
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/////////////////////////// PUBLIC /////////////////////////////////
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// Types
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// C'tors/D'tors
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AuxHash::AuxHash(AuxContext &rauxcontext,
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ALG_ID ai,
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HCRYPTKEY hKey)
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: m_hHash(0)
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{
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if (!CryptCreateHash(rauxcontext(), ai, hKey, 0, &m_hHash))
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throw scu::OsException(GetLastError());
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}
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AuxHash::~AuxHash()
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{
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if (m_hHash)
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CryptDestroyHash(m_hHash);
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}
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// Operators
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// Operations
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// Import a hash value into the hash object.
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void
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AuxHash::Import(Blob const &rblbHashValue)
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{
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if (!CryptSetHashParam(m_hHash, HP_HASHVAL,
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const_cast<BYTE *>(rblbHashValue.data()), 0))
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throw scu::OsException(GetLastError());
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}
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// Update the hash value with the data blob.
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void
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AuxHash::Update(Blob const &rblob)
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{
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if (!CryptHashData(m_hHash, rblob.data(), rblob.length(), 0))
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throw scu::OsException(GetLastError());
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}
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// Access
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ALG_ID
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AuxHash::AlgId() const
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{
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ALG_ID ai;
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DWORD c = sizeof ai;
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if (!CryptGetHashParam(m_hHash, HP_ALGID,
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reinterpret_cast<BYTE *>(&ai), &c, 0))
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throw scu::OsException(GetLastError());
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return ai;
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}
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DWORD
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AuxHash::Size() const
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{
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DWORD dwSize;
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DWORD cSize = sizeof dwSize;
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if (!CryptGetHashParam(m_hHash, HP_ALGID,
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reinterpret_cast<BYTE *>(&dwSize), &cSize, 0))
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throw scu::OsException(GetLastError());
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return dwSize;
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}
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// Completes the hash returning the hash value. No more hashing can
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// occur with this object.
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Blob
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AuxHash::Value() const
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{
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DWORD dwSize = Size();
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BYTE *bp = reinterpret_cast<BYTE *>(_alloca(dwSize));
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if (!CryptGetHashParam(m_hHash, HP_HASHVAL, bp, &dwSize, 0))
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throw scu::OsException(GetLastError());
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return Blob(bp, dwSize);
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}
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// Returns the hash of the data blob passed. No more hashing can
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// occur with this object.
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Blob
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AuxHash::Value(Blob const &rblob)
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{
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Update(rblob);
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return Value();
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}
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// Predicates
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// Static Variables
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/////////////////////////// PROTECTED /////////////////////////////////
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// C'tors/D'tors
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// Operators
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// Operations
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// Access
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// Predicates
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// Static Variables
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/////////////////////////// PRIVATE /////////////////////////////////
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// C'tors/D'tors
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// Operators
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// Operations
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// Access
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// Predicates
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// Static Variables
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