Pl_RC4.cc
1.09 KB
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#include <qpdf/Pl_RC4.hh>
#include <qpdf/QUtil.hh>
Pl_RC4::Pl_RC4(
char const* identifier,
Pipeline* next,
unsigned char const* key_data,
int key_len,
size_t out_bufsize) :
Pipeline(identifier, next),
out_bufsize(out_bufsize),
rc4(key_data, key_len)
{
if (!next) {
throw std::logic_error("Attempt to create Pl_RC4 with nullptr as next");
}
this->outbuf = QUtil::make_shared_array<unsigned char>(out_bufsize);
}
void
Pl_RC4::write(unsigned char const* data, size_t len)
{
if (this->outbuf == nullptr) {
throw std::logic_error(this->identifier + ": Pl_RC4: write() called after finish() called");
}
size_t bytes_left = len;
unsigned char const* p = data;
while (bytes_left > 0) {
size_t bytes = (bytes_left < this->out_bufsize ? bytes_left : out_bufsize);
bytes_left -= bytes;
// lgtm[cpp/weak-cryptographic-algorithm]
rc4.process(p, bytes, outbuf.get());
p += bytes;
next()->write(outbuf.get(), bytes);
}
}
void
Pl_RC4::finish()
{
outbuf = nullptr;
next()->finish();
}