Botan::PK_Ops::Encryption_with_EME Class Reference

#include <pk_ops_impl.h>

Inheritance diagram for Botan::PK_Ops::Encryption_with_EME:

Public Member Functions
virtual size_t	ciphertext_length (size_t ptext_len) const =0
std::vector< uint8_t >	encrypt (std::span< const uint8_t > ptext, RandomNumberGenerator &rng) override
size_t	max_input_bits () const override
	~Encryption_with_EME () override

Protected Member Functions
	Encryption_with_EME (std::string_view eme)

Detailed Description

Definition at line 25 of file pk_ops_impl.h.

Constructor & Destructor Documentation

~Encryption_with_EME()

Botan::PK_Ops::Encryption_with_EME::~Encryption_with_EME ( )

overridedefault

Encryption_with_EME()

Botan::PK_Ops::Encryption_with_EME::Encryption_with_EME ( std::string_view eme )

explicitprotected

Definition at line 29 of file pk_ops.cpp.

: m_eme(EME::create(eme)) {}

Member Function Documentation

ciphertext_length()

virtual size_t Botan::PK_Ops::Encryption::ciphertext_length ( size_t ptext_len ) const

pure virtualinherited

Given the plaintext length, return an upper bound of the ciphertext length for this key and padding.

encrypt()

std::vector< uint8_t > Botan::PK_Ops::Encryption_with_EME::encrypt ( std::span< const uint8_t > msg, RandomNumberGenerator & rng )

overridevirtual

Encrypt a message returning the ciphertext

Implements Botan::PK_Ops::Encryption.

Definition at line 37 of file pk_ops.cpp.

                                                                                                            {
   const size_t max_input_bits = max_ptext_input_bits();
   const size_t max_input_bytes = (max_input_bits + 7) / 8;
   BOTAN_ARG_CHECK(msg.size() <= max_input_bytes, "Plaintext too large");
 
   secure_vector<uint8_t> eme_output(max_input_bits);
   const size_t written = m_eme->pad(eme_output, msg, max_input_bits, rng);
   return raw_encrypt(std::span{eme_output}.first(written), rng);
}

References BOTAN_ARG_CHECK, and max_input_bits().

max_input_bits()

size_t Botan::PK_Ops::Encryption_with_EME::max_input_bits ( ) const

overridevirtual

Return the maximum input size for this key

Implements Botan::PK_Ops::Encryption.

Definition at line 33 of file pk_ops.cpp.

                                                       {
   return 8 * m_eme->maximum_input_size(max_ptext_input_bits());
}

Referenced by encrypt().

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

• src/lib/pubkey/pk_ops_impl.h
• src/lib/pubkey/pk_ops.cpp