RTDECL(void) RTSha1Final(PRTSHA1CONTEXT pCtx, uint8_t pabDigest[RTSHA1_HASH_SIZE])
{
Assert(pCtx->AltPrivate.cbMessage < UINT64_MAX / 2);
/*
* Complete the message by adding a single bit (0x80), padding till
* the next 448-bit boundrary, the add the message length.
*/
uint64_t const cMessageBits = pCtx->AltPrivate.cbMessage * 8;
unsigned cbMissing = RTSHA1_BLOCK_SIZE - ((unsigned)pCtx->AltPrivate.cbMessage & (RTSHA1_BLOCK_SIZE - 1U));
static uint8_t const s_abSingleBitAndSomePadding[12] = { 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
if (cbMissing < 1U + 8U)
/* Less than 64+8 bits left in the current block, force a new block. */
RTSha1Update(pCtx, &s_abSingleBitAndSomePadding, sizeof(s_abSingleBitAndSomePadding));
else
RTSha1Update(pCtx, &s_abSingleBitAndSomePadding, 1);
unsigned cbBuffered = (unsigned)pCtx->AltPrivate.cbMessage & (RTSHA1_BLOCK_SIZE - 1U);
cbMissing = RTSHA1_BLOCK_SIZE - cbBuffered;
Assert(cbMissing >= 8);
memset((uint8_t *)&pCtx->AltPrivate.auW[0] + cbBuffered, 0, cbMissing - 8);
*(uint64_t *)&pCtx->AltPrivate.auW[14] = RT_H2BE_U64(cMessageBits);
/*
* Process the last buffered block constructed/completed above.
*/
rtSha1BlockInitBuffered(pCtx);
rtSha1BlockProcess(pCtx);
/*
* Convert the byte order of the hash words and we're done.
*/
pCtx->AltPrivate.auH[0] = RT_H2BE_U32(pCtx->AltPrivate.auH[0]);
pCtx->AltPrivate.auH[1] = RT_H2BE_U32(pCtx->AltPrivate.auH[1]);
pCtx->AltPrivate.auH[2] = RT_H2BE_U32(pCtx->AltPrivate.auH[2]);
pCtx->AltPrivate.auH[3] = RT_H2BE_U32(pCtx->AltPrivate.auH[3]);
pCtx->AltPrivate.auH[4] = RT_H2BE_U32(pCtx->AltPrivate.auH[4]);
memcpy(pabDigest, &pCtx->AltPrivate.auH[0], RTSHA1_HASH_SIZE);
RT_ZERO(pCtx->AltPrivate);
pCtx->AltPrivate.cbMessage = UINT64_MAX;
}
RTDECL(void) RTSha1Update(PRTSHA1CONTEXT pCtx, const void *pvBuf, size_t cbBuf)
{
Assert(pCtx->AltPrivate.cbMessage < UINT64_MAX / 2);
uint8_t const *pbBuf = (uint8_t const *)pvBuf;
/*
* Deal with buffered bytes first.
*/
size_t cbBuffered = (size_t)pCtx->AltPrivate.cbMessage & (RTSHA1_BLOCK_SIZE - 1U);
if (cbBuffered)
{
size_t cbMissing = RTSHA1_BLOCK_SIZE - cbBuffered;
if (cbBuf >= cbMissing)
{
memcpy((uint8_t *)&pCtx->AltPrivate.auW[0] + cbBuffered, pbBuf, cbMissing);
pCtx->AltPrivate.cbMessage += cbMissing;
pbBuf += cbMissing;
cbBuf -= cbMissing;
rtSha1BlockInitBuffered(pCtx);
rtSha1BlockProcess(pCtx);
}
else
{
memcpy((uint8_t *)&pCtx->AltPrivate.auW[0] + cbBuffered, pbBuf, cbBuf);
pCtx->AltPrivate.cbMessage += cbBuf;
return;
}
}
if (!((uintptr_t)pbBuf & 3))
{
/*
* Process full blocks directly from the input buffer.
*/
while (cbBuf >= RTSHA1_BLOCK_SIZE)
{
rtSha1BlockInit(pCtx, pbBuf);
rtSha1BlockProcess(pCtx);
pCtx->AltPrivate.cbMessage += RTSHA1_BLOCK_SIZE;
pbBuf += RTSHA1_BLOCK_SIZE;
cbBuf -= RTSHA1_BLOCK_SIZE;
}
}
else
{
/*
* Unaligned input, so buffer it.
*/
while (cbBuf >= RTSHA1_BLOCK_SIZE)
{
memcpy((uint8_t *)&pCtx->AltPrivate.auW[0], pbBuf, RTSHA1_BLOCK_SIZE);
rtSha1BlockInitBuffered(pCtx);
rtSha1BlockProcess(pCtx);
pCtx->AltPrivate.cbMessage += RTSHA1_BLOCK_SIZE;
pbBuf += RTSHA1_BLOCK_SIZE;
cbBuf -= RTSHA1_BLOCK_SIZE;
}
}
/*
* Stash any remaining bytes into the context buffer.
*/
if (cbBuf > 0)
{
memcpy((uint8_t *)&pCtx->AltPrivate.auW[0], pbBuf, cbBuf);
pCtx->AltPrivate.cbMessage += cbBuf;
}
}
