#include <rsa.h>

Inheritance diagram for Botan::RSA_Private_Operation:

Public Member Functions
SecureVector< byte >	decrypt (const byte msg[], size_t msg_len)
size_t	max_input_bits () const
virtual size_t	message_part_size () const
virtual size_t	message_parts () const
	RSA_Private_Operation (const RSA_PrivateKey &rsa)
SecureVector< byte >	sign (const byte msg[], size_t msg_len, RandomNumberGenerator &rng)

Detailed Description

RSA private (decrypt/sign) operation

Definition at line 89 of file rsa.h.

Constructor & Destructor Documentation

◆ RSA_Private_Operation()

Botan::RSA_Private_Operation::RSA_Private_Operation ( const RSA_PrivateKey & rsa )

Definition at line 63 of file rsa.cpp.

                                                                      :
   n(rsa.get_n()),
   q(rsa.get_q()),
   c(rsa.get_c()),
   powermod_e_n(rsa.get_e(), rsa.get_n()),
   powermod_d1_p(rsa.get_d1(), rsa.get_p()),
   powermod_d2_q(rsa.get_d2(), rsa.get_q()),
   mod_p(rsa.get_p())
   {
   BigInt k(global_state().global_rng(), n.bits() - 1);
   blinder = Blinder(powermod_e_n(k), inverse_mod(k, n), n);
   }

References Botan::Blinder::Blinder(), Botan::global_state(), and Botan::inverse_mod().

Referenced by Botan::Core_Engine::get_decryption_op(), and Botan::Core_Engine::get_signature_op().

Member Function Documentation

◆ decrypt()

SecureVector< byte > Botan::RSA_Private_Operation::decrypt	(	const byte	msg[],
		size_t	msg_len )

virtual

Implements Botan::PK_Ops::Decryption.

Definition at line 107 of file rsa.cpp.

   {
   BigInt m(msg, msg_len);
   BigInt x = blinder.unblind(private_op(blinder.blind(m)));
 
   BOTAN_ASSERT(m == powermod_e_n(x),
                "RSA private op failed consistency check");
 
   return BigInt::encode(x);
   }

References BOTAN_ASSERT, and Botan::BigInt::encode().

◆ max_input_bits()

size_t Botan::RSA_Private_Operation::max_input_bits ( ) const

inlinevirtual

Get the maximum message size in bits supported by this public key.

Returns: maximum message in bits

Implements Botan::PK_Ops::Signature.

Definition at line 95 of file rsa.h.

95{ return (n.bits() - 1); }

◆ message_part_size()

virtual size_t Botan::PK_Ops::Signature::message_part_size ( ) const

inlinevirtualinherited

Find out the message part size supported by this scheme/key.

Returns: size of the message parts

Reimplemented in Botan::DSA_Signature_Operation, Botan::ECDSA_Signature_Operation, and Botan::NR_Signature_Operation.

Definition at line 62 of file pk_ops.h.

62{ return 0; }

◆ message_parts()

virtual size_t Botan::PK_Ops::Signature::message_parts ( ) const

inlinevirtualinherited

Find out the number of message parts supported by this scheme.

Returns: number of message parts

Reimplemented in Botan::DSA_Signature_Operation, Botan::ECDSA_Signature_Operation, and Botan::NR_Signature_Operation.

Definition at line 56 of file pk_ops.h.

56{ return 1; }

◆ sign()

SecureVector< byte > Botan::RSA_Private_Operation::sign	(	const byte	msg[],
		size_t	msg_len,
		RandomNumberGenerator &	rng )