MD5 support + documentation for all hashes
diff --git a/docs/primitives/cryptographic-hashes.rst b/docs/primitives/cryptographic-hashes.rst
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+Message Digests
+====================
+
+SHA-1
+~~~~~~~
+
+.. attention::
+
+ NIST has deprecated SHA-1 in favor of the SHA-2 variants. New applications
+ are strongly suggested to use SHA-2 over SHA-1.
+
+.. class:: cryptography.primitives.hashes.SHA1()
+
+ SHA-1 is a cryptographic hash function standardized by NIST. It has a
+ 160-bit message digest.
+
+ .. method:: update(string)
+
+ :param bytes string: The bytes you wish to hash.
+
+ .. method:: digest()
+
+ :return bytes: The message digest as bytes.
+
+ .. method:: hexdigest()
+
+ :return str: The message digest as hex.
+
+
+SHA-2 Family
+~~~~~~~
+
+.. class:: cryptography.primitives.hashes.SHA224()
+
+ SHA-224 is a cryptographic hash function from the SHA-2 family and
+ standardized by NIST. It has a 224-bit message digest.
+
+ .. method:: update(string)
+
+ :param bytes string: The bytes you wish to hash.
+
+ .. method:: digest()
+
+ :return bytes: The message digest as bytes.
+
+ .. method:: hexdigest()
+
+ :return str: The message digest as hex.
+
+.. class:: cryptography.primitives.hashes.SHA256()
+
+ SHA-256 is a cryptographic hash function from the SHA-2 family and
+ standardized by NIST. It has a 256-bit message digest.
+
+ .. method:: update(string)
+
+ :param bytes string: The bytes you wish to hash.
+
+ .. method:: digest()
+
+ :return bytes: The message digest as bytes.
+
+ .. method:: hexdigest()
+
+ :return str: The message digest as hex.
+
+.. class:: cryptography.primitives.hashes.SHA384()
+
+ SHA-384 is a cryptographic hash function from the SHA-2 family and
+ standardized by NIST. It has a 384-bit message digest.
+
+ .. method:: update(string)
+
+ :param bytes string: The bytes you wish to hash.
+
+ .. method:: digest()
+
+ :return bytes: The message digest as bytes.
+
+ .. method:: hexdigest()
+
+ :return str: The message digest as hex.
+
+.. class:: cryptography.primitives.hashes.SHA512()
+
+ SHA-512 is a cryptographic hash function from the SHA-2 family and
+ standardized by NIST. It has a 512-bit message digest.
+
+ .. method:: update(string)
+
+ :param bytes string: The bytes you wish to hash.
+
+ .. method:: digest()
+
+ :return bytes: The message digest as bytes.
+
+ .. method:: hexdigest()
+
+ :return str: The message digest as hex.
+
+RIPEMD160
+~~~~~~~
+
+.. class:: cryptography.primitives.hashes.RIPEMD160()
+
+ RIPEMD160 is a cryptographic hash function that is part of ISO/IEC
+ 10118-3:2004. It has a 160-bit message digest.
+
+ .. method:: update(string)
+
+ :param bytes string: The bytes you wish to hash.
+
+ .. method:: digest()
+
+ :return bytes: The message digest as bytes.
+
+ .. method:: hexdigest()
+
+ :return str: The message digest as hex.
+
+Whirlpool
+~~~~~~~
+
+.. class:: cryptography.primitives.hashes.Whirlpool()
+
+ Whirlpool is a cryptographic hash function that is part of ISO/IEC
+ 10118-3:2004. It has a 512-bit message digest.
+
+ .. method:: update(string)
+
+ :param bytes string: The bytes you wish to hash.
+
+ .. method:: digest()
+
+ :return bytes: The message digest as bytes.
+
+ .. method:: hexdigest()
+
+ :return str: The message digest as hex.
+
+MD5
+~~~~~~~
+
+.. warning::
+
+ MD5 is a deprecated hash algorithm that has practical known collision
+ attacks. You are strongly discouraged from using it.
+
+.. class:: cryptography.primitives.hashes.MD5()
+
+ MD5 is a deprecated cryptographic hash function. It has a 160-bit message
+ digest and has practical known collision attacks.
+
+ .. method:: update(string)
+
+ :param bytes string: The bytes you wish to hash.
+
+ .. method:: digest()
+
+ :return bytes: The message digest as bytes.
+
+ .. method:: hexdigest()
+
+ :return str: The message digest as hex.