AES_PDF: switch to pluggable crypto

1 files changed, 55 insertions, 0 deletions

diff --git a/libqpdf/AES_PDF_native.cc b/libqpdf/AES_PDF_native.cc
new file mode 100644
index 00000000..d6907ee3
--- /dev/null
+++ b/libqpdf/AES_PDF_native.cc
@@ -0,0 +1,55 @@
+#include <qpdf/AES_PDF_native.hh>
+#include <qpdf/QUtil.hh>
+#include <cstring>
+#include <assert.h>
+#include <stdexcept>
+#include <qpdf/rijndael.h>
+#include <qpdf/QIntC.hh>
+#include <string>
+#include <stdlib.h>
+
+AES_PDF_native::AES_PDF_native(bool encrypt, unsigned char const* key,
+                               size_t key_bytes) :
+    encrypt(encrypt),
+    nrounds(0)
+{
+    size_t keybits = 8 * key_bytes;
+    this->key = std::unique_ptr<unsigned char[]>(
+        new unsigned char[key_bytes],
+        std::default_delete<unsigned char[]>());
+    this->rk = std::unique_ptr<uint32_t[]>(
+        new uint32_t[RKLENGTH(keybits)],
+        std::default_delete<uint32_t[]>());
+    size_t rk_bytes = RKLENGTH(keybits) * sizeof(uint32_t);
+    std::memcpy(this->key.get(), key, key_bytes);
+    std::memset(this->rk.get(), 0, rk_bytes);
+    if (encrypt)
+    {
+	this->nrounds = rijndaelSetupEncrypt(
+            this->rk.get(), this->key.get(), keybits);
+    }
+    else
+    {
+	this->nrounds = rijndaelSetupDecrypt(
+            this->rk.get(), this->key.get(), keybits);
+    }
+}
+
+AES_PDF_native::~AES_PDF_native()
+{
+}
+
+void
+AES_PDF_native::update(unsigned char* in_data, unsigned char* out_data)
+{
+    if (this->encrypt)
+    {
+	rijndaelEncrypt(this->rk.get(),
+                        this->nrounds, in_data, out_data);
+    }
+    else
+    {
+	rijndaelDecrypt(this->rk.get(),
+                        this->nrounds, in_data, out_data);
+    }
+}