Botan::RFC6979_Nonce_Generator Class Reference

#include <rfc6979.h>

Public Member Functions
const BigInt &	nonce_for (const BigInt &m)
	RFC6979_Nonce_Generator (const std::string &hash, const BigInt &order, const BigInt &x)
	~RFC6979_Nonce_Generator ()

Detailed Description

Definition at line 21 of file rfc6979.h.

Constructor & Destructor Documentation

Botan::RFC6979_Nonce_Generator::RFC6979_Nonce_Generator	(	const std::string &	hash,
		const BigInt &	order,
		const BigInt &	x
	)

Note: keeps persistent reference to order

Definition at line 14 of file rfc6979.cpp.

References Botan::MessageAuthenticationCode::create(), and Botan::BigInt::encode_1363().

                                                                  :
   m_order(order),
   m_qlen(m_order.bits()),
   m_rlen(m_qlen / 8 + (m_qlen % 8 ? 1 : 0)),
   m_rng_in(m_rlen * 2),
   m_rng_out(m_rlen)
   {
   m_hmac_drbg.reset(new HMAC_DRBG(MessageAuthenticationCode::create("HMAC(" + hash + ")")));
   BigInt::encode_1363(m_rng_in.data(), m_rlen, x);
   }

Botan::RFC6979_Nonce_Generator::~RFC6979_Nonce_Generator

(

)

Definition at line 27 of file rfc6979.cpp.

   {
   // for ~unique_ptr
   }

Member Function Documentation

const BigInt & Botan::RFC6979_Nonce_Generator::nonce_for

(

const BigInt &

m

)

Definition at line 32 of file rfc6979.cpp.

References Botan::BigInt::binary_decode(), and Botan::BigInt::encode_1363().

Referenced by Botan::generate_rfc6979_nonce().

   {
   BigInt::encode_1363(&m_rng_in[m_rlen], m_rlen, m);
   m_hmac_drbg->clear();
   m_hmac_drbg->initialize_with(m_rng_in.data(), m_rng_in.size());

   do
      {
      m_hmac_drbg->randomize(m_rng_out.data(), m_rng_out.size());
      m_k.binary_decode(m_rng_out.data(), m_rng_out.size());
      m_k >>= (8*m_rlen - m_qlen);
      }
   while(m_k == 0 || m_k >= m_order);

   return m_k;
   }

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The documentation for this class was generated from the following files:

• src/lib/pubkey/rfc6979/rfc6979.h
• src/lib/pubkey/rfc6979/rfc6979.cpp