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// Copyright (c) 2014-2018 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <crypto/hmac_sha256.h>

            

        

            

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#include <string.h>

            

        

            

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CHMAC_SHA256::CHMAC_SHA256(const unsigned char* key, size_t keylen)

            

        

            

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{

            

        

            

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    unsigned char rkey[64];

            

        

            

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    if (keylen <= 64) {

            

        

            

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        memcpy(rkey, key, keylen);

            

        

            

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        memset(rkey + keylen, 0, 64 - keylen);

            

        

            

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    } else {

            

        

            

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        CSHA256().Write(key, keylen).Finalize(rkey);

            

        

            

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        memset(rkey + 32, 0, 32);

            

        

            

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    }

            

        

            

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    for (int n = 0; n < 64; n++)

            

        

            

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        rkey[n] ^= 0x5c;

            

        

            

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    outer.Write(rkey, 64);

            

        

            

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    for (int n = 0; n < 64; n++)

            

        

            

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        rkey[n] ^= 0x5c ^ 0x36;

            

        

            

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    inner.Write(rkey, 64);

            

        

            

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}

            

        

            

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void CHMAC_SHA256::Finalize(unsigned char hash[OUTPUT_SIZE])

            

        

            

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{

            

        

            

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    unsigned char temp[32];

            

        

            

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    inner.Finalize(temp);

            

        

            

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    outer.Write(temp, 32).Finalize(hash);

            

        

            

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}