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#include "hash.h"

int HMAC_SHA512_Init(HMAC_SHA512_CTX *pctx, const void *pkey, size_t len)

{

unsigned char key[128];

if (len <= 128)

{

memcpy(key, pkey, len);

memset(key + len, 0, 128-len);

}

else

{

SHA512_CTX ctxKey;

SHA512_Init(&ctxKey);

SHA512_Update(&ctxKey, pkey, len);

SHA512_Final(key, &ctxKey);

memset(key + 64, 0, 64);

}

for (int n=0; n<128; n++)

key[n] ^= 0x5c;

SHA512_Init(&pctx->ctxOuter);

SHA512_Update(&pctx->ctxOuter, key, 128);

for (int n=0; n<128; n++)

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

SHA512_Init(&pctx->ctxInner);

return SHA512_Update(&pctx->ctxInner, key, 128);

}

int HMAC_SHA512_Update(HMAC_SHA512_CTX *pctx, const void *pdata, size_t len)

{

return SHA512_Update(&pctx->ctxInner, pdata, len);

}

int HMAC_SHA512_Final(unsigned char *pmd, HMAC_SHA512_CTX *pctx)

{

unsigned char buf[64];

SHA512_Final(buf, &pctx->ctxInner);

SHA512_Update(&pctx->ctxOuter, buf, 64);

return SHA512_Final(pmd, &pctx->ctxOuter);

}