diff options
Diffstat (limited to 'src/lib/pubkey/dlies/dlies.cpp')
| -rw-r--r-- | src/lib/pubkey/dlies/dlies.cpp | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/src/lib/pubkey/dlies/dlies.cpp b/src/lib/pubkey/dlies/dlies.cpp index a4603f0d7..5465401d1 100644 --- a/src/lib/pubkey/dlies/dlies.cpp +++ b/src/lib/pubkey/dlies/dlies.cpp @@ -97,20 +97,17 @@ std::vector<uint8_t> DLIES_Encryptor::enc(const uint8_t in[], size_t length, /** * Return the max size, in bytes, of a message -* Not_Implemented if DLIES is used in XOR encryption mode +* We assume DLIES is only used for key transport and limit the maximum size +* to 512 bits */ size_t DLIES_Encryptor::maximum_input_size() const { - if(m_cipher) - { - // no limit in block cipher mode - return std::numeric_limits<size_t>::max(); - } - else - { - // No way to determine if the KDF will output enough bits for XORing with the plaintext?! - throw Not_Implemented("Not implemented for XOR encryption mode"); - } + return 64; + } + +size_t DLIES_Encryptor::ciphertext_length(size_t ptext_len) const + { + return m_own_pub_key.size() + m_mac->output_length() + m_cipher->output_length(ptext_len); } DLIES_Decryptor::DLIES_Decryptor(const DH_PrivateKey& own_priv_key, @@ -141,6 +138,14 @@ DLIES_Decryptor::DLIES_Decryptor(const DH_PrivateKey& own_priv_key, DLIES_Decryptor(own_priv_key, rng, kdf, nullptr, 0, mac, mac_key_length) {} +size_t DLIES_Decryptor::plaintext_length(size_t ctext_len) const + { + if(ctext_len < m_pub_key_size + m_mac->output_length()) + return 0; // will throw if attempted + + return ctext_len - (m_pub_key_size + m_mac->output_length()); + } + secure_vector<uint8_t> DLIES_Decryptor::do_decrypt(uint8_t& valid_mask, const uint8_t msg[], size_t length) const { |