Pl_SHA2.cc
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#include <qpdf/Pl_SHA2.hh>
#include <qpdf/QPDFCryptoProvider.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/Util.hh>
using namespace qpdf;
Pl_SHA2::Pl_SHA2(int bits, Pipeline* next) :
Pipeline("sha2", next)
{
if (bits) {
resetBits(bits);
}
}
void
Pl_SHA2::write(unsigned char const* buf, size_t len)
{
if (!in_progress) {
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 const* data = buf;
while (bytes_left > 0) {
size_t bytes = (bytes_left >= max_bytes ? max_bytes : bytes_left);
crypto->SHA2_update(data, bytes);
bytes_left -= bytes;
data += bytes;
}
if (next()) {
next()->write(buf, len);
}
}
void
Pl_SHA2::finish()
{
if (next()) {
next()->finish();
}
crypto->SHA2_finalize();
in_progress = false;
}
void
Pl_SHA2::resetBits(int bits)
{
util::assertion(!in_progress, "bit reset requested for in-progress SHA2 Pipeline");
crypto = QPDFCryptoProvider::getImpl();
crypto->SHA2_init(bits);
}
std::string
Pl_SHA2::getRawDigest()
{
util::assertion(!in_progress, "digest requested for in-progress SHA2 Pipeline");
return crypto->SHA2_digest();
}
std::string
Pl_SHA2::getHexDigest()
{
util::assertion(!in_progress, "digest requested for in-progress SHA2 Pipeline");
return QUtil::hex_encode(getRawDigest());
}