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diff --git a/include/axolotl/crypto.hh b/include/axolotl/crypto.hh
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--- a/include/axolotl/crypto.hh
+++ /dev/null
@@ -1,148 +0,0 @@
-/* Copyright 2015 OpenMarket Ltd
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-#ifndef AXOLOTL_CRYPTO_HH_
-#define AXOLOTL_CRYPTO_HH_
-
-#include <cstdint>
-#include <cstddef>
-
-namespace axolotl {
-
-
-struct Curve25519PublicKey {
-    static const int LENGTH = 32;
-    std::uint8_t public_key[32];
-};
-
-
-struct Curve25519KeyPair : public Curve25519PublicKey {
-    static const int LENGTH = 64;
-    std::uint8_t private_key[32];
-};
-
-
-/** Generate a curve25519 key pair from 32 random bytes. */
-void generate_key(
-    std::uint8_t const * random_32_bytes,
-    Curve25519KeyPair & key_pair
-);
-
-
-const std::size_t CURVE25519_SHARED_SECRET_LENGTH = 32;
-
-
-/** Create a shared secret using our private key and their public key.
- * The output buffer must be at least 32 bytes long. */
-void curve25519_shared_secret(
-    Curve25519KeyPair const & our_key,
-    Curve25519PublicKey const & their_key,
-    std::uint8_t * output
-);
-
-
-/** Signs the message using our private key.
- * The output buffer must be at least 64 bytes long. */
-void curve25519_sign(
-    Curve25519KeyPair const & our_key,
-    std::uint8_t const * message, std::size_t message_length,
-    std::uint8_t * output
-);
-
-
-/** Verify thei message using their public key.
- * The signature input buffer must be 64 bytes long.
- * Returns true if the signature is valid. */
-bool curve25519_verify(
-    Curve25519PublicKey const & their_key,
-    std::uint8_t const * message, std::size_t message_length,
-    std::uint8_t const * signature
-);
-
-
-struct Aes256Key {
-    static const int LENGTH = 32;
-    std::uint8_t key[32];
-};
-
-
-struct Aes256Iv {
-    static const int LENGTH = 16;
-    std::uint8_t iv[16];
-};
-
-
-/** The length of output the aes_encrypt_cbc function will write */
-std::size_t aes_encrypt_cbc_length(
-    std::size_t input_length
-);
-
-
-/** Encrypts the input using AES256 in CBC mode with PKCS#7 padding.
- * The output buffer must be big enough to hold the output including padding */
-void aes_encrypt_cbc(
-    Aes256Key const & key,
-    Aes256Iv const & iv,
-    std::uint8_t const * input, std::size_t input_length,
-    std::uint8_t * output
-);
-
-
-/** Decrypts the input using AES256 in CBC mode. The output buffer must be at
- * least the same size as the input buffer. Returns the length of the plaintext
- * without padding on success or std::size_t(-1) if the padding is invalid.
- */
-std::size_t aes_decrypt_cbc(
-    Aes256Key const & key,
-    Aes256Iv const & iv,
-    std::uint8_t const * input, std::size_t input_length,
-    std::uint8_t * output
-);
-
-
-/** Computes SHA-256 of the input. The output buffer must be a least 32
- * bytes long. */
-void sha256(
-    std::uint8_t const * input, std::size_t input_length,
-    std::uint8_t * output
-);
-
-
-const std::size_t HMAC_SHA256_OUTPUT_LENGTH = 32;
-
-
-/** HMAC: Keyed-Hashing for Message Authentication
- * http://tools.ietf.org/html/rfc2104
- * Computes HMAC-SHA-256 of the input for the key. The output buffer must
- * be at least 32 bytes long. */
-void hmac_sha256(
-    std::uint8_t const * key, std::size_t key_length,
-    std::uint8_t const * input, std::size_t input_length,
-    std::uint8_t * output
-);
-
-
-/** HMAC-based Key Derivation Function (HKDF)
- * https://tools.ietf.org/html/rfc5869
- * Derives key material from the input bytes. */
-void hkdf_sha256(
-    std::uint8_t const * input, std::size_t input_length,
-    std::uint8_t const * info, std::size_t info_length,
-    std::uint8_t const * salt, std::size_t salt_length,
-    std::uint8_t * output, std::size_t output_length
-);
-
-} // namespace axolotl
-
-#endif /* AXOLOTL_CRYPTO_HH_ */