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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
#ifndef SHA1_H_
#define SHA1_H_
// Hasher class, performs no allocation and therefore does not throw or return
// errors. Usage is as follows:
// Create an instance (this initializes the hash).
// Add one or more blocks of input data using AddData().
// Retrieve the hash using GetHash(). This can be done as many times as desired
// until the object is destructed. Once a hash is asked for, further AddData
// calls will be ignored. There is no way to reset object state (simply
// destroy the object and create another instead).
#define SHA1_HASH_SIZE 20 // Number of bytes output by SHA-1
typedef struct {
DWORD magic_sha1; // Magic value for A_SHA_CTX
DWORD awaiting_data[16];
// Data awaiting full 512-bit block.
// Length (nbit_total[0] % 512) bits.
// Unused part of buffer (at end) is zero
DWORD partial_hash[5];
// Hash through last full block
DWORD nbit_total[2];
// Total length of message so far
// (bits, mod 2^64)
} SHA1_CTX;
class SHA1Hash
{
private:
SHA1_CTX m_Context;
BYTE m_Value[SHA1_HASH_SIZE];
BOOL m_fFinalized;
void SHA1Init(SHA1_CTX*);
void SHA1Update(SHA1_CTX*, const BYTE*, const DWORD);
void SHA1Final(SHA1_CTX*, BYTE* digest);
public:
SHA1Hash();
void AddData(BYTE *pbData, DWORD cbData);
BYTE *GetHash();
};
#endif // SHA1_H_
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