1 files changed, 22 insertions, 0 deletions
diff --git a/src/pwm_qhash.cpp b/src/pwm_qhash.cpp
new file mode 100644
index 0000000..f9528d4
--- /dev/null
+++ b/src/pwm_qhash.cpp
@@ -0,0 +1,22 @@
+#include <QCryptographicHash>
+
+extern "C" {
+    /**
+     *  Forwards the call to QCryptographicHash::hash() and copies the output into the provided buffer.
+     *  Returns zero on error (unsupported hash type or insufficient output_capacity). Number of written output bytes otherwise.
+     */
+    Q_DECL_EXPORT size_t pwm_qhash(size_t algorithm, const unsigned char * input, size_t input_length, unsigned char * output, size_t output_capacity)
+    {
+        if(algorithm > 6)
+            return 0; //failed.
+        const auto algo{static_cast<QCryptographicHash::Algorithm>(algorithm)};
+        QCryptographicHash hasher{algo};
+        hasher.addData(reinterpret_cast<const char *>(input), input_length);
+        const auto hash{hasher.result()};
+        const auto count_as_size{static_cast<size_t>(hash.length())};
+        if(count_as_size > output_capacity)
+            return 0;
+        memcpy(output,hash.constData(),count_as_size);
+        return count_as_size;
+    }
+}