Problem: no unit tests for base85 or public curve functions.

Makefile.am

@@ -401,7 +401,9 @@ test_apps = \
 	tests/test_sockopt_hwm \
 	tests/test_heartbeats \
 	tests/test_stream_exceeds_buffer \
-	tests/test_pub_invert_matching
+	tests/test_pub_invert_matching \
+	tests/test_base85 \
+	tests/test_sodium
 
 tests_test_ancillaries_SOURCES = tests/test_ancillaries.cpp
 tests_test_ancillaries_LDADD = src/libzmq.la
@@ -606,6 +608,12 @@ tests_test_stream_exceeds_buffer_LDADD = src/libzmq.la
 tests_test_pub_invert_matching_SOURCES = tests/test_pub_invert_matching.cpp
 tests_test_pub_invert_matching_LDADD = src/libzmq.la
 
+tests_test_base85_SOURCES = tests/test_base85.cpp
+tests_test_base85_LDADD = src/libzmq.la
+
+tests_test_sodium_SOURCES = tests/test_sodium.cpp
+tests_test_sodium_LDADD = src/libzmq.la
+
 if !ON_MINGW
 if !ON_CYGWIN
 test_apps += \

src/zmq_utils.cpp

@@ -196,11 +196,8 @@ int zmq_curve_keypair (char *z85_public_key, char *z85_secret_key)
     uint8_t public_key [32];
     uint8_t secret_key [32];
 
-    int rc = crypto_box_keypair (public_key, secret_key);
+    // Return codes are suppressed as none of these can actually fail.
-    //  Is there a sensible errno to set here (no, it cannot fail)?
+    crypto_box_keypair (public_key, secret_key);
-    if (rc)
-        return rc;
-
     zmq_z85_encode (z85_public_key, public_key, 32);
     zmq_z85_encode (z85_secret_key, secret_key, 32);
 
@@ -232,11 +229,8 @@ int zmq_curve_public (char *z85_public_key, const char *z85_secret_key)
     if (zmq_z85_decode (secret_key, z85_secret_key) == NULL)
         return -1;
 
-    int rc = crypto_scalarmult_base (public_key, secret_key);
+    // Return codes are suppressed as none of these can actually fail.
-    //  Is there a sensible errno to set here (no, it cannot fail)?
+    crypto_scalarmult_base (public_key, secret_key);
-    if (rc)
-        return rc;
-
     zmq_z85_encode (z85_public_key, public_key, 32);
 
     return 0;

tests/CMakeLists.txt

@@ -65,6 +65,8 @@ set(tests
         test_stream_timeout
         test_xpub_manual
         test_xpub_welcome_msg
+        test_base85
+        test_sodium
 )
 if(NOT WIN32)
   list(APPEND tests

tests/test_base85.cpp

@@ -0,0 +1,92 @@
+/*
+    Copyright (c) 2016 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "testutil.hpp"
+
+// Test vector: rfc.zeromq.org/spec:32/Z85
+void test__zmq_z85_encode__valid__success ()
+{
+    static const size_t size = 8;
+    static const size_t length = size * 5 / 4;
+    static const uint8_t decoded[size] = {
+        0x86, 0x4F, 0xD2, 0x6F, 0xB5, 0x59, 0xF7, 0x5B
+    };
+    static const char expected[length + 1] = "HelloWorld";
+    char out_encoded[length + 1] = { 0 };
+
+    errno = 0;
+    assert (zmq_z85_encode(out_encoded, decoded, size) != NULL);
+    assert (streq (out_encoded, expected));
+    assert (zmq_errno () == 0);
+}
+
+// Buffer length must be evenly divisible by 4 or must fail with EINVAL.
+void test__zmq_z85_encode__invalid__failure (size_t size)
+{
+    errno = 0;
+    assert (zmq_z85_encode(NULL, NULL, size) == NULL);
+    assert (zmq_errno () == EINVAL);
+}
+
+// Test vector: rfc.zeromq.org/spec:32/Z85
+void test__zmq_z85_decode__valid__success ()
+{
+    static const size_t size = 10 * 4 / 5;
+    static const uint8_t expected[size] = {
+        0x86, 0x4F, 0xD2, 0x6F, 0xB5, 0x59, 0xF7, 0x5B
+    };
+    static const char* encoded = "HelloWorld";
+    uint8_t out_decoded[size] = { 0 };
+
+    errno = 0;
+    assert (zmq_z85_decode(out_decoded, encoded) != NULL);
+    assert (zmq_errno () == 0);
+    assert (memcmp (out_decoded, expected, size) == 0);
+}
+
+// String length must be evenly divisible by 5 or must fail with EINVAL.
+void test__zmq_z85_decode__invalid__failure (const char *encoded)
+{
+    errno = 0;
+    assert (zmq_z85_decode(NULL, encoded) == NULL);
+    assert (zmq_errno () == EINVAL);
+}
+
+int main (void)
+{
+    test__zmq_z85_encode__valid__success ();
+    test__zmq_z85_encode__invalid__failure (1);
+    test__zmq_z85_encode__invalid__failure (42);
+
+    test__zmq_z85_decode__valid__success ();
+    test__zmq_z85_decode__invalid__failure ("01234567");
+    test__zmq_z85_decode__invalid__failure ("0");
+
+    return 0;
+}

tests/test_sodium.cpp

@@ -0,0 +1,99 @@
+/*
+    Copyright (c) 2016 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq 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 Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "testutil.hpp"
+
+// There is no way to test for correctness because of the embedded RNG.
+void test__zmq_curve_keypair__always__success (void)
+{
+    errno = 0;
+    char public_key[41] = { 0 };
+    char secret_key[41] = { 0 };
+
+    const int rc = zmq_curve_keypair(public_key, secret_key);
+
+#if defined (ZMQ_HAVE_CURVE)
+    assert (rc == 0);
+    assert (zmq_errno () == 0);
+#else
+    assert (rc == -1);
+    assert (zmq_errno () == ENOTSUP);
+#endif
+}
+
+void test__zmq_curve_public__valid__success ()
+{
+    // These are paired according to hintjens.com/blog:45
+    static const char public_key[] = "Yne@$w-vo<fVvi]a<NY6T1ed:M$fCG*[IaLV{hID";
+    static const char secret_key[] = "D:)Q[IlAW!ahhC2ac:9*A}h:p?([4%wOTJ%JR%cs";
+
+    errno = 0;
+    char out_public[41] = { 0 };
+
+    const int rc = zmq_curve_public (out_public, secret_key);
+
+#if defined (ZMQ_HAVE_CURVE)
+    assert (rc == 0);
+    assert (zmq_errno () == 0);
+    assert (streq (out_public, public_key));
+#else
+    assert (rc == -1);
+    assert (zmq_errno () == ENOTSUP);
+    (void) public_key;
+#endif
+}
+
+// The key length must be evenly divisible by 5 or must fail with EINVAL.
+void test__zmq_curve_public__invalid__failure (const char *secret)
+{
+    errno = 0;
+    char out_public[41] = { 0 };
+
+    const int rc = zmq_curve_public(out_public, secret);
+
+#if defined (ZMQ_HAVE_CURVE)
+    assert (rc == -1);
+    assert (zmq_errno () == EINVAL);
+    assert (streq (out_public, ""));
+#else
+    assert (rc == -1);
+    assert (zmq_errno () == ENOTSUP);
+#endif
+}
+
+int main (void)
+{
+    test__zmq_curve_keypair__always__success ();
+
+    test__zmq_curve_public__valid__success ();
+    test__zmq_curve_public__invalid__failure ("42");
+    test__zmq_curve_public__invalid__failure ("0123456789012345678901234567890123456789.");
+
+    return 0;
+}