diff --git a/test/Makefile b/test/Makefile
index e08bb25b..8b938246 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -17,7 +17,9 @@ DEST_DIR=../bin
 # This -Wall was supported by the European Commission through the ERC Starting Grant 805031 (EPOQUE)
 CFLAGS=-Wall -Wextra -Wpedantic -Werror -Wundef -std=c99 -I$(COMMON_DIR) $(EXTRAFLAGS)
 
-all: $(DEST_DIR)/functest_$(SCHEME)_$(IMPLEMENTATION) $(DEST_DIR)/testvectors_$(SCHEME)_$(IMPLEMENTATION)
+all: $(DEST_DIR)/functest_$(SCHEME)_$(IMPLEMENTATION) \
+	$(DEST_DIR)/testvectors_$(SCHEME)_$(IMPLEMENTATION) \
+	$(DEST_DIR)/printparams_$(SCHEME)_$(IMPLEMENTATION)
 
 .PHONY: build-scheme
 build-scheme:
@@ -33,6 +35,9 @@ functest: $(DEST_DIR)/functest_$(SCHEME)_$(IMPLEMENTATION)
 .PHONY: testvectors
 testvectors: $(DEST_DIR)/testvectors_$(SCHEME)_$(IMPLEMENTATION)
 
+.PHONY: printparams
+printparams: $(DEST_DIR)/printparams_$(SCHEME)_$(IMPLEMENTATION)
+
 $(DEST_DIR)/test_fips202: common/fips202.c $(COMMON_FILES)
 	mkdir -p $(DEST_DIR)
 	$(CC) $(CFLAGS) $< $(COMMON_FILES) -o $@
@@ -49,6 +54,10 @@ $(DEST_DIR)/testvectors_$(SCHEME)_$(IMPLEMENTATION): build-scheme crypto_$(TYPE)
 	mkdir -p $(DEST_DIR)
 	$(CC) $(CFLAGS) -DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)_$(IMPLEMENTATION_UPPERCASE) -I$(SCHEME_DIR) crypto_$(TYPE)/testvectors.c $(COMMON_FILES) $(COMMON_DIR)/notrandombytes.c -o $@ -L$(SCHEME_DIR) -l$(SCHEME)_$(IMPLEMENTATION)
 
+$(DEST_DIR)/printparams_$(SCHEME)_$(IMPLEMENTATION): build-scheme crypto_$(TYPE)/printparams.c
+	mkdir -p $(DEST_DIR)
+	$(CC) $(CFLAGS) -DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)_$(IMPLEMENTATION_UPPERCASE) -I$(SCHEME_DIR) crypto_$(TYPE)/printparams.c -o $@
+
 .PHONY: clean
 clean:
 	$(RM) $(DEST_DIR)/functest_$(SCHEME)_$(IMPLEMENTATION)
diff --git a/test/Makefile.Microsoft_nmake b/test/Makefile.Microsoft_nmake
index 21afb364..9b3661e4 100644
--- a/test/Makefile.Microsoft_nmake
+++ b/test/Makefile.Microsoft_nmake
@@ -35,6 +35,8 @@ functest: $(DEST_DIR)\functest_$(SCHEME)_$(IMPLEMENTATION).exe
 
 testvectors: $(DEST_DIR)\testvectors_$(SCHEME)_$(IMPLEMENTATION).exe
 
+printparams: $(DEST_DIR)\printparams_$(SCHEME)_$(IMPLEMENTATION).exe
+
 $(DEST_DIR)\functest_$(SCHEME)_$(IMPLEMENTATION).exe: build-scheme $(COMMON_OBJECTS) $(COMMON_DIR)\randombytes.obj
     -MKDIR $(DEST_DIR)
     -DEL functest.obj
@@ -47,7 +49,13 @@ $(DEST_DIR)\testvectors_$(SCHEME)_$(IMPLEMENTATION).exe: build-scheme $(COMMON_O
     $(CC) /c crypto_$(TYPE)\testvectors.c $(CFLAGS) /I $(SCHEME_DIR) /DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)_$(IMPLEMENTATION_UPPERCASE)
     LINK.EXE /OUT:$@ testvectors.obj $(COMMON_OBJECTS_NOPATH) notrandombytes.obj $(SCHEME_DIR)\lib$(SCHEME)_$(IMPLEMENTATION).lib
 
+$(DEST_DIR)\printparams_$(SCHEME)_$(IMPLEMENTATION).exe: crypto_$(TYPE)\printparams.c $(SCHEME_DIR)\api.h
+    -MKDIR $(DEST_DIR)
+    -DEL printparams.obj
+    $(CC) /c crypto_$(TYPE)\printparams.c $(CFLAGS) /I $(SCHEME_DIR) /DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)_$(IMPLEMENTATION_UPPERCASE)
+    LINK.EXE /OUT:$@ printparams.obj
+
 clean:
-    -DEL functest.obj testvectors.obj
+    -DEL functest.obj testvectors.obj printparams.obj
     -DEL $(COMMON_OBJECTS_NOPATH) randombytes.obj notrandombytes.obj
     -DEL $(DEST_DIR)\functest_$(SCHEME)_$(IMPLEMENTATION).exe
diff --git a/test/crypto_kem/printparams.c b/test/crypto_kem/printparams.c
new file mode 100644
index 00000000..925b2119
--- /dev/null
+++ b/test/crypto_kem/printparams.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include "api.h"
+
+#define PASTER(x, y) x##_##y
+#define EVALUATOR(x, y) PASTER(x, y)
+#define NAMESPACE(fun) EVALUATOR(PQCLEAN_NAMESPACE, fun)
+
+int main() {
+    printf("{\n");
+    printf("\t\"CRYPTO_SECRETKEYBYTES\": %u,\n",  NAMESPACE(CRYPTO_SECRETKEYBYTES));
+    printf("\t\"CRYPTO_PUBLICKEYBYTES\": %u,\n",  NAMESPACE(CRYPTO_PUBLICKEYBYTES));
+    printf("\t\"CRYPTO_CIPHERTEXTBYTES\": %u,\n", NAMESPACE(CRYPTO_CIPHERTEXTBYTES));
+    printf("\t\"CRYPTO_BYTES\": %u\n}\n",         NAMESPACE(CRYPTO_BYTES));
+}
diff --git a/test/crypto_sign/printparams.c b/test/crypto_sign/printparams.c
new file mode 100644
index 00000000..8c38767c
--- /dev/null
+++ b/test/crypto_sign/printparams.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include "api.h"
+
+#define PASTER(x, y) x##_##y
+#define EVALUATOR(x, y) PASTER(x, y)
+#define NAMESPACE(fun) EVALUATOR(PQCLEAN_NAMESPACE, fun)
+
+int main() {
+    printf("{\n");
+    printf("\t\"CRYPTO_SECRETKEYBYTES\": %u,\n",  NAMESPACE(CRYPTO_SECRETKEYBYTES));
+    printf("\t\"CRYPTO_PUBLICKEYBYTES\": %u,\n",  NAMESPACE(CRYPTO_PUBLICKEYBYTES));
+    printf("\t\"CRYPTO_BYTES\": %u\n}\n",         NAMESPACE(CRYPTO_BYTES));
+}
diff --git a/test/test_metadata_sizes.py b/test/test_metadata_sizes.py
new file mode 100644
index 00000000..dc1dfacb
--- /dev/null
+++ b/test/test_metadata_sizes.py
@@ -0,0 +1,50 @@
+import json
+import os
+
+import pqclean
+import helpers
+
+
+def test_metadata_sizes():
+    for scheme in pqclean.Scheme.all_schemes():
+        for implementation in scheme.implementations:
+            yield check_metadata_sizes, implementation
+
+
+def check_metadata_sizes(implementation):
+    metadata = implementation.scheme.metadata()
+    helpers.make('printparams',
+                 TYPE=implementation.scheme.type,
+                 SCHEME=implementation.scheme.name,
+                 IMPLEMENTATION=implementation.name,
+                 working_dir=os.path.join('..', 'test'))
+
+    out = helpers.run_subprocess(
+            [os.path.join('..', 'bin', 'printparams_{}_{}{}'.format(
+                implementation.scheme.name,
+                implementation.name,
+                '.exe' if os.name == 'nt' else ''
+            ))],
+            os.path.join('..', 'bin'),
+        ).replace('\r', '')
+
+    parsed = json.loads(out)
+
+    assert parsed['CRYPTO_SECRETKEYBYTES'] == metadata['length-secret-key']
+    assert parsed['CRYPTO_PUBLICKEYBYTES'] == metadata['length-public-key']
+
+    if implementation.scheme.type == 'kem':
+        assert (
+            parsed['CRYPTO_CIPHERTEXTBYTES'] == metadata['length-ciphertext'])
+        assert parsed['CRYPTO_BYTES'] == metadata['length-shared-secret']
+    else:
+        assert parsed['CRYPTO_BYTES'] == metadata['length-signature']
+
+
+if __name__ == '__main__':
+    try:
+        import nose2
+        nose2.main()
+    except ImportError:
+        import nose
+        nose.runmodule()