qssl: add support for QSsl::Opaque key

This allow to use directly EVP_PKEY * with QSslKey (for
example comming from a PKCS#11 dongle).

Change-Id: Icb1ba5081506a831ec3d8cfffe13ce70939608ea
Merge-request: 48
Reviewed-by: Peter Hartmann <peter.hartmann@nokia.com>
Reviewed-on: http://codereview.qt.nokia.com/4010
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>

src/network/ssl/qssl.h

@@ -63,6 +63,7 @@ namespace QSsl {
     };
 
     enum KeyAlgorithm {
+        Opaque,
         Rsa,
         Dsa
     };

src/network/ssl/qsslkey.cpp

@@ -89,6 +89,11 @@ void QSslKeyPrivate::clear(bool deep)
             q_DSA_free(dsa);
         dsa = 0;
     }
+    if (opaque) {
+        if (deep)
+            q_EVP_PKEY_free(opaque);
+        opaque = 0;
+    }
 }
 
 /*!
@@ -264,6 +269,23 @@ QSslKey::QSslKey(QIODevice *device, QSsl::KeyAlgorithm algorithm, QSsl::Encoding
                  passPhrase);
 }
 
+/*!
+    Constructs a QSslKey from a valid native key \a handle.
+    \a type specifies whether the key is public or private.
+
+    QSslKey will take ownership for this key and you must not
+    free the key using the native library. The algorithm used
+    when creating a key from a handle will always be QSsl::Opaque.
+*/
+QSslKey::QSslKey(Qt::HANDLE handle, QSsl::KeyType type)
+    : d(new QSslKeyPrivate)
+{
+    d->opaque = reinterpret_cast<EVP_PKEY *>(handle);
+    d->algorithm = QSsl::Opaque;
+    d->type = type;
+    d->isNull = !d->opaque;
+}
+
 /*!
     Constructs an identical copy of \a other.
 */
@@ -315,8 +337,9 @@ void QSslKey::clear()
 */
 int QSslKey::length() const
 {
-    if (d->isNull)
+    if (d->isNull || d->algorithm == QSsl::Opaque)
         return -1;
+
     return (d->algorithm == QSsl::Rsa)
            ? q_BN_num_bits(d->rsa->n) : q_BN_num_bits(d->dsa->p);
 }
@@ -345,8 +368,9 @@ QSsl::KeyAlgorithm QSslKey::algorithm() const
 // ### autotest failure for non-empty passPhrase and private key
 QByteArray QSslKey::toDer(const QByteArray &passPhrase) const
 {
-    if (d->isNull)
+    if (d->isNull || d->algorithm == QSsl::Opaque)
         return QByteArray();
+
     return d->derFromPem(toPem(passPhrase));
 }
 
@@ -357,7 +381,7 @@ QByteArray QSslKey::toDer(const QByteArray &passPhrase) const
 */
 QByteArray QSslKey::toPem(const QByteArray &passPhrase) const
 {
-    if (!QSslSocket::supportsSsl() || d->isNull)
+    if (!QSslSocket::supportsSsl() || d->isNull || d->algorithm == QSsl::Opaque)
         return QByteArray();
 
     BIO *bio = q_BIO_new(q_BIO_s_mem());
@@ -417,7 +441,16 @@ QByteArray QSslKey::toPem(const QByteArray &passPhrase) const
 */
 Qt::HANDLE QSslKey::handle() const
 {
-    return (d->algorithm == QSsl::Rsa) ? Qt::HANDLE(d->rsa) : Qt::HANDLE(d->dsa);
+    switch (d->algorithm) {
+    case QSsl::Opaque:
+        return Qt::HANDLE(d->opaque);
+    case QSsl::Rsa:
+        return Qt::HANDLE(d->rsa);
+    case QSsl::Dsa:
+        return Qt::HANDLE(d->dsa);
+    default:
+        return Qt::HANDLE(NULL);
+    }
 }
 
 /*!
@@ -435,6 +468,8 @@ bool QSslKey::operator==(const QSslKey &other) const
         return false;
     if (length() != other.length())
         return false;
+    if (algorithm() == QSsl::Opaque)
+        return handle() == other.handle();
     return toDer() == other.toDer();
 }
 
@@ -450,7 +485,8 @@ QDebug operator<<(QDebug debug, const QSslKey &key)
 {
     debug << "QSslKey("
           << (key.type() == QSsl::PublicKey ? "PublicKey" : "PrivateKey")
-          << ", " << (key.algorithm() == QSsl::Rsa ? "RSA" : "DSA")
+          << ", " << (key.algorithm() == QSsl::Opaque ? "OPAQUE" :
+                      (key.algorithm() == QSsl::Rsa ? "RSA" : "DSA"))
           << ", " << key.length()
           << ')';
     return debug;

src/network/ssl/qsslkey.h

@@ -73,6 +73,7 @@ public:
             QSsl::EncodingFormat format = QSsl::Pem,
             QSsl::KeyType type = QSsl::PrivateKey,
             const QByteArray &passPhrase = QByteArray());
+    explicit QSslKey(Qt::HANDLE handle, QSsl::KeyType type = QSsl::PrivateKey);
     QSslKey(const QSslKey &other);
     ~QSslKey();
     QSslKey &operator=(const QSslKey &other);

src/network/ssl/qsslkey_p.h

@@ -67,6 +67,7 @@ public:
     inline QSslKeyPrivate()
         : rsa(0)
         , dsa(0)
+        , opaque(0)
     {
         clear();
     }
@@ -88,6 +89,7 @@ public:
     QSsl::KeyAlgorithm algorithm;
     RSA *rsa;
     DSA *dsa;
+    EVP_PKEY *opaque;
 
     QAtomicInt ref;
 

src/network/ssl/qsslsocket_openssl.cpp

@@ -364,6 +364,9 @@ init_context:
             return false;
         }
 
+        if (configuration.privateKey.algorithm() == QSsl::Opaque) {
+            pkey = reinterpret_cast<EVP_PKEY *>(configuration.privateKey.handle());
+        } else {
             // Load private key
             pkey = q_EVP_PKEY_new();
             // before we were using EVP_PKEY_assign_R* functions and did not use EVP_PKEY_free.
@@ -373,11 +376,15 @@ init_context:
                 q_EVP_PKEY_set1_RSA(pkey, (RSA *)configuration.privateKey.handle());
             else
                 q_EVP_PKEY_set1_DSA(pkey, (DSA *)configuration.privateKey.handle());
+        }
+
         if (!q_SSL_CTX_use_PrivateKey(ctx, pkey)) {
             q->setErrorString(QSslSocket::tr("Error loading private key, %1").arg(getErrorsFromOpenSsl()));
             emit q->error(QAbstractSocket::UnknownSocketError);
             return false;
         }
+        if (configuration.privateKey.algorithm() == QSsl::Opaque)
+            pkey = 0; // Don't free the private key, it belongs to QSslKey
 
         // Check if the certificate matches the private key.
         if (!q_SSL_CTX_check_private_key(ctx)) {
@@ -1383,7 +1390,6 @@ void QSslSocketBackendPrivate::disconnected()
         q_EVP_PKEY_free(pkey);
         pkey = 0;
     }
-
 }
 
 QSslCipher QSslSocketBackendPrivate::sessionCipher() const