Pl_SHA2.cc
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#include <qpdf/Pl_SHA2.hh>
#include <stdexcept>
#include <cstdio>
#include <qpdf/PointerHolder.hh>
#include <qpdf/QUtil.hh>
Pl_SHA2::Pl_SHA2(int bits, Pipeline* next) :
Pipeline("sha2", next),
in_progress(false),
bits(0)
{
if (bits)
{
resetBits(bits);
}
}
Pl_SHA2::~Pl_SHA2()
{
}
void
Pl_SHA2::badBits()
{
throw std::logic_error("Pl_SHA2 has unexpected value for bits");
}
void
Pl_SHA2::write(unsigned char* buf, size_t len)
{
if (! this->in_progress)
{
switch (bits)
{
case 256:
sph_sha256_init(&this->ctx256);
break;
case 384:
sph_sha384_init(&this->ctx384);
break;
case 512:
sph_sha512_init(&this->ctx512);
break;
default:
badBits();
break;
}
this->in_progress = true;
}
// Write in chunks in case len is too big to fit in an int.
// Assume int is at least 32 bits.
static size_t const max_bytes = 1 << 30;
size_t bytes_left = len;
unsigned char* data = buf;
while (bytes_left > 0)
{
size_t bytes = (bytes_left >= max_bytes ? max_bytes : bytes_left);
switch (bits)
{
case 256:
sph_sha256(&this->ctx256, data, bytes);
break;
case 384:
sph_sha384(&this->ctx384, data, bytes);
break;
case 512:
sph_sha512(&this->ctx512, data, bytes);
break;
default:
badBits();
break;
}
bytes_left -= bytes;
data += bytes;
}
if (this->getNext(true))
{
this->getNext()->write(buf, len);
}
}
void
Pl_SHA2::finish()
{
if (this->getNext(true))
{
this->getNext()->finish();
}
switch (bits)
{
case 256:
sph_sha256_close(&this->ctx256, sha256sum);
break;
case 384:
sph_sha384_close(&this->ctx384, sha384sum);
break;
case 512:
sph_sha512_close(&this->ctx512, sha512sum);
break;
default:
badBits();
break;
}
this->in_progress = false;
}
void
Pl_SHA2::resetBits(int bits)
{
if (this->in_progress)
{
throw std::logic_error(
"bit reset requested for in-progress SHA2 Pipeline");
}
if (! ((bits == 256) || (bits == 384) || (bits == 512)))
{
throw std::logic_error("Pl_SHA2 called with bits != 256, 384, or 512");
}
this->bits = bits;
}
std::string
Pl_SHA2::getRawDigest()
{
std::string result;
switch (bits)
{
case 256:
result = std::string((char*)this->sha256sum, sizeof(this->sha256sum));
break;
case 384:
result = std::string((char*)this->sha384sum, sizeof(this->sha384sum));
break;
case 512:
result = std::string((char*)this->sha512sum, sizeof(this->sha512sum));
break;
default:
badBits();
break;
}
return result;
}
std::string
Pl_SHA2::getHexDigest()
{
if (this->in_progress)
{
throw std::logic_error(
"digest requested for in-progress SHA2 Pipeline");
}
return QUtil::hex_encode(getRawDigest());
}