Coverage Report

Created: 2020-05-23 13:54

/src/botan/build/include/botan/sp800_56c.h
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/*
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* KDF defined in NIST SP 800-56c
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* (C) 2016 Kai Michaelis
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*
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* Botan is released under the Simplified BSD License (see license.txt)
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*/
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#ifndef BOTAN_SP800_56C_H_
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#define BOTAN_SP800_56C_H_
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#include <botan/kdf.h>
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#include <botan/mac.h>
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BOTAN_FUTURE_INTERNAL_HEADER(sp800_56c.h)
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namespace Botan {
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/**
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 * NIST SP 800-56C KDF
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 */
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class BOTAN_PUBLIC_API(2,0) SP800_56C final : public KDF
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   {
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   public:
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      std::string name() const override { return "SP800-56C(" + m_prf->name() + ")"; }
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      KDF* clone() const override { return new SP800_56C(m_prf->clone(), m_exp->clone()); }
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      /**
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      * Derive a key using the SP800-56C KDF.
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      *
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      * The implementation hard codes the context value for the
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      * expansion step to the empty string.
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      *
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      * @param key derived keying material K_M
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      * @param key_len the desired output length in bytes
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      * @param secret shared secret Z
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      * @param secret_len size of Z in bytes
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      * @param salt salt s of the extraction step
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      * @param salt_len size of s in bytes
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      * @param label label for the expansion step
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      * @param label_len size of label in bytes
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      *
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      * @throws Invalid_Argument key_len > 2^32
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      */
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      size_t kdf(uint8_t key[], size_t key_len,
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                 const uint8_t secret[], size_t secret_len,
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                 const uint8_t salt[], size_t salt_len,
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                 const uint8_t label[], size_t label_len) const override;
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      /**
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      * @param mac MAC algorithm used for randomness extraction
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      * @param exp KDF used for key expansion
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      */
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      SP800_56C(MessageAuthenticationCode* mac, KDF* exp) : m_prf(mac), m_exp(exp) {}
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   private:
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      std::unique_ptr<MessageAuthenticationCode> m_prf;
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      std::unique_ptr<KDF> m_exp;
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   };
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}
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#endif