66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
//******************************************************************************
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//* HMAC_SHA1.cpp : Implementation of HMAC SHA1 algorithm
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//* Comfort to RFC 2104
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//*
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//******************************************************************************
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#include <iostream>
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#include <memory>
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#include "ICEHMAC.h"
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#include "ICESHA1.h"
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void ICEHMAC::GetDigest(unsigned char *text, int text_len, unsigned char *key, int key_len, unsigned char *digest)
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{
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memset(SHA1_Key, 0, SHA1_BLOCK_SIZE);
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/* repeated 64 times for values in ipad and opad */
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memset(m_ipad, 0x36, sizeof(m_ipad));
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memset(m_opad, 0x5c, sizeof(m_opad));
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/* STEP 1 */
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if (key_len > SHA1_DIGEST_LENGTH)
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{
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ICESHA1::Reset();
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ICESHA1::Update((UINT_8 *)key, key_len);
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ICESHA1::Final();
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ICESHA1::GetHash((UINT_8 *)SHA1_Key);
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}
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else
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memcpy(SHA1_Key, key, key_len);
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/* STEP 2 */
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for (int i=0; i<sizeof(m_ipad); i++)
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{
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m_ipad[i] ^= SHA1_Key[i];
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}
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/* STEP 3 */
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memcpy(AppendBuf1, m_ipad, sizeof(m_ipad));
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memcpy(AppendBuf1 + sizeof(m_ipad), text, text_len);
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/* STEP 4 */
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ICESHA1::Reset();
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ICESHA1::Update((unsigned char *)AppendBuf1, sizeof(m_ipad) + text_len);
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ICESHA1::Final();
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ICESHA1::GetHash((unsigned char *)szReport);
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/* STEP 5 */
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for (int j=0; j<sizeof(m_opad); j++)
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{
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m_opad[j] ^= SHA1_Key[j];
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}
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/* STEP 6 */
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memcpy(AppendBuf2, m_opad, sizeof(m_opad));
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memcpy(AppendBuf2 + sizeof(m_opad), szReport, SHA1_DIGEST_LENGTH);
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/*STEP 7 */
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ICESHA1::Reset();
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ICESHA1::Update((unsigned char*)AppendBuf2, sizeof(m_opad) + SHA1_DIGEST_LENGTH);
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ICESHA1::Final();
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ICESHA1::GetHash((unsigned char *)digest);
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}
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