Simone
d074cc7c07
Plugin: ns7zip v2.0.0 Architectures: x86-ansi, x86-unicode, amd64-unicode License: LGPL-2.1-or-later
49 lines
931 B
C++
49 lines
931 B
C++
// Pbkdf2HmacSha1.cpp
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#include "StdAfx.h"
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#include <string.h>
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#include "../../../C/CpuArch.h"
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#include "HmacSha1.h"
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#include "Pbkdf2HmacSha1.h"
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namespace NCrypto {
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namespace NSha1 {
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void Pbkdf2Hmac(const Byte *pwd, size_t pwdSize,
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const Byte *salt, size_t saltSize,
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UInt32 numIterations,
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Byte *key, size_t keySize)
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{
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MY_ALIGN (16)
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CHmac baseCtx;
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baseCtx.SetKey(pwd, pwdSize);
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for (UInt32 i = 1; keySize != 0; i++)
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{
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MY_ALIGN (16)
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CHmac ctx;
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ctx = baseCtx;
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ctx.Update(salt, saltSize);
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MY_ALIGN (16)
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UInt32 u[kNumDigestWords];
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SetBe32(u, i)
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ctx.Update((const Byte *)u, 4);
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ctx.Final((Byte *)u);
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ctx = baseCtx;
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ctx.GetLoopXorDigest1((void *)u, numIterations - 1);
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const unsigned curSize = (keySize < kDigestSize) ? (unsigned)keySize : kDigestSize;
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memcpy(key, (const Byte *)u, curSize);
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key += curSize;
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keySize -= curSize;
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}
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}
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}}
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