sp800_108.h

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/*
* KDFs defined in NIST SP 800-108
* (C) 2016 Kai Michaelis
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_SP800_108_H_
#define BOTAN_SP800_108_H_
 
#include <botan/kdf.h>
#include <botan/mac.h>
 
namespace Botan {
 
/**
 * NIST SP 800-108 KDF in Counter Mode (5.1)
 */
class SP800_108_Counter final : public KDF
   {
   public:
      std::string name() const override;
 
      std::unique_ptr<KDF> new_object() const override;
 
      /**
      * Derive a key using the SP800-108 KDF in Counter mode.
      *
      * The implementation hard codes the length of [L]_2
      * and [i]_2 (the value r) to 32 bits.
      *
      * @param key resulting keying material
      * @param key_len the desired output length in bytes
      * @param secret K_I
      * @param secret_len size of K_I in bytes
      * @param salt Context
      * @param salt_len size of Context in bytes
      * @param label Label
      * @param label_len size of Label in bytes
      *
      * @throws Invalid_Argument key_len > 2^32
      */
      void 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 MAC algorithm to use
      */
      explicit SP800_108_Counter(std::unique_ptr<MessageAuthenticationCode> mac) : m_prf(std::move(mac)) {}
   private:
      std::unique_ptr<MessageAuthenticationCode> m_prf;
   };
 
/**
 * NIST SP 800-108 KDF in Feedback Mode (5.2)
 */
class SP800_108_Feedback final : public KDF
   {
   public:
      std::string name() const override;
 
      std::unique_ptr<KDF> new_object() const override;
 
      /**
      * Derive a key using the SP800-108 KDF in Feedback mode.
      *
      * The implementation uses the optional counter i and hard
      * codes the length of [L]_2 and [i]_2 (the value r) to 32 bits.
      *
      * @param key resulting keying material
      * @param key_len the desired output length in bytes
      * @param secret K_I
      * @param secret_len size of K_I in bytes
      * @param salt IV || Context
      * @param salt_len size of Context plus IV in bytes
      * @param label Label
      * @param label_len size of Label in bytes
      *
      * @throws Invalid_Argument key_len > 2^32
      */
      void 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;
 
      explicit SP800_108_Feedback(std::unique_ptr<MessageAuthenticationCode> mac) : m_prf(std::move(mac)) {}
   private:
      std::unique_ptr<MessageAuthenticationCode> m_prf;
   };
 
/**
 * NIST SP 800-108 KDF in Double Pipeline Mode (5.3)
 */
class SP800_108_Pipeline final : public KDF
   {
   public:
      std::string name() const override;
 
      std::unique_ptr<KDF> new_object() const override;
 
      /**
      * Derive a key using the SP800-108 KDF in Double Pipeline mode.
      *
      * The implementation uses the optional counter i and hard
      * codes the length of [L]_2 and [i]_2 (the value r) to 32 bits.
      *
      * @param key resulting keying material
      * @param key_len the desired output length in bytes
      * @param secret K_I
      * @param secret_len size of K_I in bytes
      * @param salt Context
      * @param salt_len size of Context in bytes
      * @param label Label
      * @param label_len size of Label in bytes
      *
      * @throws Invalid_Argument key_len > 2^32
      */
      void 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;
 
      explicit SP800_108_Pipeline(std::unique_ptr<MessageAuthenticationCode> mac) : m_prf(std::move(mac)) {}
 
   private:
      std::unique_ptr<MessageAuthenticationCode> m_prf;
   };
 
}
 
#endif