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diff --git a/comm/third_party/botan/src/lib/kdf/sp800_56a/sp800_56a.h b/comm/third_party/botan/src/lib/kdf/sp800_56a/sp800_56a.h
new file mode 100644
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+++ b/comm/third_party/botan/src/lib/kdf/sp800_56a/sp800_56a.h
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+/*
+* KDF defined in NIST SP 800-56a revision 2 (Single-step key-derivation function)
+*
+* (C) 2017 Ribose Inc. Written by Krzysztof Kwiatkowski.
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_SP800_56A_H_
+#define BOTAN_SP800_56A_H_
+
+#include <botan/kdf.h>
+#include <botan/hash.h>
+#include <botan/mac.h>
+
+BOTAN_FUTURE_INTERNAL_HEADER(sp800_56a.h)
+
+namespace Botan {
+
+/**
+ * NIST SP 800-56A KDF using hash function
+ * @warning This KDF ignores the provided salt value
+ */
+class BOTAN_PUBLIC_API(2,2) SP800_56A_Hash final : public KDF
+   {
+   public:
+      std::string name() const override { return "SP800-56A(" + m_hash->name() + ")"; }
+
+      KDF* clone() const override { return new SP800_56A_Hash(m_hash->clone()); }
+
+      /**
+      * Derive a key using the SP800-56A KDF.
+      *
+      * The implementation hard codes the context value for the
+      * expansion step to the empty string.
+      *
+      * @param key derived keying material K_M
+      * @param key_len the desired output length in bytes
+      * @param secret shared secret Z
+      * @param secret_len size of Z in bytes
+      * @param salt ignored
+      * @param salt_len ignored
+      * @param label label for the expansion step
+      * @param label_len size of label in bytes
+      *
+      * @throws Invalid_Argument key_len > 2^32
+      */
+      size_t kdf(uint8_t key[], size_t key_len,
+                 const uint8_t secret[], size_t secret_len,
+                 const uint8_t salt[], size_t salt_len,
+                 const uint8_t label[], size_t label_len) const override;
+
+      /**
+      * @param hash the hash function to use as the auxiliary function
+      */
+      explicit SP800_56A_Hash(HashFunction* hash) : m_hash(hash) {}
+   private:
+      std::unique_ptr<HashFunction> m_hash;
+   };
+
+/**
+ * NIST SP 800-56A KDF using HMAC
+ */
+class BOTAN_PUBLIC_API(2,2) SP800_56A_HMAC final : public KDF
+   {
+   public:
+      std::string name() const override { return "SP800-56A(" + m_mac->name() + ")"; }
+
+      KDF* clone() const override { return new SP800_56A_HMAC(m_mac->clone()); }
+
+      /**
+      * Derive a key using the SP800-56A KDF.
+      *
+      * The implementation hard codes the context value for the
+      * expansion step to the empty string.
+      *
+      * @param key derived keying material K_M
+      * @param key_len the desired output length in bytes
+      * @param secret shared secret Z
+      * @param secret_len size of Z in bytes
+      * @param salt ignored
+      * @param salt_len ignored
+      * @param label label for the expansion step
+      * @param label_len size of label in bytes
+      *
+      * @throws Invalid_Argument key_len > 2^32 or MAC is not a HMAC
+      */
+      size_t kdf(uint8_t key[], size_t key_len,
+                 const uint8_t secret[], size_t secret_len,
+                 const uint8_t salt[], size_t salt_len,
+                 const uint8_t label[], size_t label_len) const override;
+
+      /**
+      * @param mac the HMAC to use as the auxiliary function
+      */
+      explicit SP800_56A_HMAC(MessageAuthenticationCode* mac);
+   private:
+      std::unique_ptr<MessageAuthenticationCode> m_mac;
+   };
+
+}
+
+#endif