md: Add support for MD2 and MD4

> low hanging fruits

ChangeLog

@@ -1,3 +1,7 @@
+[next]
+
+* md: Support MD2 and MD4 algo.
+
 [0.18.3]
 
 * setup.py: Refuse to build if mbedtls is too old.

README.rst

@@ -94,8 +94,10 @@ information to mbed TLS.
 Message digest
 --------------
 
-The *mbedtls.hash* module supports MD5, SHA-1, SHA-2 (in 224, 256, 384,
-and 512-bits), and RIPEMD-160 secure hashes and message digests.
+The *mbedtls.hash* module supports MD2, MD4, MD5, SHA-1, SHA-2
+(in 224, 256, 384, and 512-bits), and RIPEMD-160 secure hashes
+and message digests.  Note that MD2 and MD4 are not included
+by default and are only present if they are compiled in mbedtls.
 
 Here are the examples from *hashlib* ported to *python-mbedtls*:
 

tests/test_md.py

@@ -92,6 +92,14 @@ class TestHashMD2(_TestHash):
     def algorithm(self):
         return md_hash.md2()
 
+    @pytest.fixture
+    def digest_size(self):
+        return 16
+
+    @pytest.fixture
+    def block_size(self):
+        return 16
+
 
 @pytest.mark.skipif(
     not mbedtls.has_feature("md4"), reason="requires MD4 support in libmbedtls"
@@ -101,6 +109,14 @@ class TestHashMD4(_TestHash):
     def algorithm(self):
         return md_hash.md4()
 
+    @pytest.fixture
+    def digest_size(self):
+        return 16
+
+    @pytest.fixture
+    def block_size(self):
+        return 64
+
 
 @pytest.mark.skipif(
     not mbedtls.has_feature("md5"), reason="requires MD5 support in libmbedtls"
@@ -255,6 +271,14 @@ class TestHmacMD2(_TestHmac):
     def algorithm(self, key):
         return md_hmac.md2(key)
 
+    @pytest.fixture
+    def digest_size(self):
+        return 16
+
+    @pytest.fixture
+    def block_size(self):
+        return 16
+
 
 @pytest.mark.skipif(
     not mbedtls.has_feature("md4"), reason="requires MD4 support in libmbedtls"
@@ -264,6 +288,14 @@ class TestHmacMD4(_TestHmac):
     def algorithm(self, key):
         return md_hmac.md4(key)
 
+    @pytest.fixture
+    def digest_size(self):
+        return 16
+
+    @pytest.fixture
+    def block_size(self):
+        return 64
+
 
 @pytest.mark.skipif(
     not mbedtls.has_feature("md5"), reason="requires MD5 support in libmbedtls"