Add crypto classes and tests. Link to libgcrypt.

src/crypto/CryptoHash.cpp

@@ -0,0 +1,88 @@
+/*
+ *  Copyright (C) 2010 Felix Geyer <debfx@fobos.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "CryptoHash.h"
+
+#include "gcrypt.h"
+
+class CryptoHashPrivate
+{
+public:
+    gcry_md_hd_t ctx;
+    int hashLen;
+};
+
+CryptoHash::CryptoHash(CryptoHash::Algorithm algo)
+    : d_ptr(new CryptoHashPrivate())
+{
+    Q_D(CryptoHash);
+
+    int algoGcrypt;
+
+    switch (algo) {
+    case CryptoHash::Sha256:
+        algoGcrypt = GCRY_MD_SHA256;
+        break;
+
+    default:
+        Q_ASSERT(false);
+        break;
+    }
+
+    gcry_md_open(&d->ctx, algoGcrypt, 0); // TODO error handling
+
+    d->hashLen = gcry_md_get_algo_dlen(algoGcrypt);
+}
+
+CryptoHash::~CryptoHash()
+{
+    Q_D(CryptoHash);
+
+    gcry_md_close(d->ctx);
+
+    delete d_ptr;
+}
+
+void CryptoHash::addData(const QByteArray& data)
+{
+    Q_D(CryptoHash);
+
+    gcry_md_write(d->ctx, data.constData(), data.size());
+}
+
+void CryptoHash::reset()
+{
+    Q_D(CryptoHash);
+
+    gcry_md_reset(d->ctx);
+}
+
+QByteArray CryptoHash::result() const
+{
+    Q_D(const CryptoHash);
+
+    const char* result = reinterpret_cast<const char*>(gcry_md_read(d->ctx, 0));
+    return QByteArray(result, d->hashLen);
+}
+
+QByteArray CryptoHash::hash(const QByteArray& data, CryptoHash::Algorithm algo)
+{
+    // replace with gcry_md_hash_buffer()?
+    CryptoHash cryptoHash(algo);
+    cryptoHash.addData(data);
+    return cryptoHash.result();
+}