diff options
Diffstat (limited to 'old/botan/src/pubkey/dlies')
-rw-r--r-- | old/botan/src/pubkey/dlies/dlies.cpp | 137 | ||||
-rw-r--r-- | old/botan/src/pubkey/dlies/dlies.h | 69 | ||||
-rw-r--r-- | old/botan/src/pubkey/dlies/info.txt | 16 |
3 files changed, 222 insertions, 0 deletions
diff --git a/old/botan/src/pubkey/dlies/dlies.cpp b/old/botan/src/pubkey/dlies/dlies.cpp new file mode 100644 index 0000000..c441ed1 --- /dev/null +++ b/old/botan/src/pubkey/dlies/dlies.cpp @@ -0,0 +1,137 @@ +/* +* DLIES +* (C) 1999-2007 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/dlies.h> +#include <botan/look_pk.h> +#include <botan/xor_buf.h> + +namespace Botan { + +/* +* DLIES_Encryptor Constructor +*/ +DLIES_Encryptor::DLIES_Encryptor(const PK_Key_Agreement_Key& k, + KDF* kdf_obj, + MessageAuthenticationCode* mac_obj, + u32bit mac_kl) : + key(k), kdf(kdf_obj), mac(mac_obj), mac_keylen(mac_kl) + { + } + +DLIES_Encryptor::~DLIES_Encryptor() + { + delete kdf; + delete mac; + } + +/* +* DLIES Encryption +*/ +SecureVector<byte> DLIES_Encryptor::enc(const byte in[], u32bit length, + RandomNumberGenerator&) const + { + if(length > maximum_input_size()) + throw Invalid_Argument("DLIES: Plaintext too large"); + if(other_key.is_empty()) + throw Invalid_State("DLIES: The other key was never set"); + + MemoryVector<byte> v = key.public_value(); + + SecureVector<byte> out(v.size() + length + mac->OUTPUT_LENGTH); + out.copy(v, v.size()); + out.copy(v.size(), in, length); + + SecureVector<byte> vz(v, key.derive_key(other_key, other_key.size())); + + const u32bit K_LENGTH = length + mac_keylen; + OctetString K = kdf->derive_key(K_LENGTH, vz, vz.size()); + if(K.length() != K_LENGTH) + throw Encoding_Error("DLIES: KDF did not provide sufficient output"); + byte* C = out + v.size(); + + xor_buf(C, K.begin() + mac_keylen, length); + mac->set_key(K.begin(), mac_keylen); + + mac->update(C, length); + for(u32bit j = 0; j != 8; ++j) + mac->update(0); + + mac->final(C + length); + + return out; + } + +/* +* Set the other parties public key +*/ +void DLIES_Encryptor::set_other_key(const MemoryRegion<byte>& ok) + { + other_key = ok; + } + +/* +* Return the max size, in bytes, of a message +*/ +u32bit DLIES_Encryptor::maximum_input_size() const + { + return 32; + } + +/* +* DLIES_Decryptor Constructor +*/ +DLIES_Decryptor::DLIES_Decryptor(const PK_Key_Agreement_Key& k, + KDF* kdf_obj, + MessageAuthenticationCode* mac_obj, + u32bit mac_kl) : + key(k), kdf(kdf_obj), mac(mac_obj), mac_keylen(mac_kl) + { + } + +DLIES_Decryptor::~DLIES_Decryptor() + { + delete kdf; + delete mac; + } + +/* +* DLIES Decryption +*/ +SecureVector<byte> DLIES_Decryptor::dec(const byte msg[], u32bit length) const + { + const u32bit public_len = key.public_value().size(); + + if(length < public_len + mac->OUTPUT_LENGTH) + throw Decoding_Error("DLIES decryption: ciphertext is too short"); + + const u32bit CIPHER_LEN = length - public_len - mac->OUTPUT_LENGTH; + + SecureVector<byte> v(msg, public_len); + SecureVector<byte> C(msg + public_len, CIPHER_LEN); + SecureVector<byte> T(msg + public_len + CIPHER_LEN, mac->OUTPUT_LENGTH); + + SecureVector<byte> vz(v, key.derive_key(v, v.size())); + + const u32bit K_LENGTH = C.size() + mac_keylen; + OctetString K = kdf->derive_key(K_LENGTH, vz, vz.size()); + if(K.length() != K_LENGTH) + throw Encoding_Error("DLIES: KDF did not provide sufficient output"); + + mac->set_key(K.begin(), mac_keylen); + mac->update(C); + for(u32bit j = 0; j != 8; ++j) + mac->update(0); + SecureVector<byte> T2 = mac->final(); + if(T != T2) + throw Integrity_Failure("DLIES: message authentication failed"); + + xor_buf(C, K.begin() + mac_keylen, C.size()); + + return C; + } + +} diff --git a/old/botan/src/pubkey/dlies/dlies.h b/old/botan/src/pubkey/dlies/dlies.h new file mode 100644 index 0000000..88a22b9 --- /dev/null +++ b/old/botan/src/pubkey/dlies/dlies.h @@ -0,0 +1,69 @@ +/* +* DLIES +* (C) 1999-2007 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#ifndef BOTAN_DLIES_H__ +#define BOTAN_DLIES_H__ + +#include <botan/pubkey.h> +#include <botan/mac.h> +#include <botan/kdf.h> + +namespace Botan { + +/* +* DLIES Encryption +*/ +class BOTAN_DLL DLIES_Encryptor : public PK_Encryptor + { + public: + DLIES_Encryptor(const PK_Key_Agreement_Key&, + KDF* kdf, + MessageAuthenticationCode* mac, + u32bit mac_key_len = 20); + + ~DLIES_Encryptor(); + + void set_other_key(const MemoryRegion<byte>&); + private: + SecureVector<byte> enc(const byte[], u32bit, + RandomNumberGenerator&) const; + u32bit maximum_input_size() const; + + const PK_Key_Agreement_Key& key; + SecureVector<byte> other_key; + + KDF* kdf; + MessageAuthenticationCode* mac; + u32bit mac_keylen; + }; + +/* +* DLIES Decryption +*/ +class BOTAN_DLL DLIES_Decryptor : public PK_Decryptor + { + public: + DLIES_Decryptor(const PK_Key_Agreement_Key&, + KDF* kdf, + MessageAuthenticationCode* mac, + u32bit mac_key_len = 20); + + ~DLIES_Decryptor(); + + private: + SecureVector<byte> dec(const byte[], u32bit) const; + + const PK_Key_Agreement_Key& key; + + KDF* kdf; + MessageAuthenticationCode* mac; + u32bit mac_keylen; + }; + +} + +#endif diff --git a/old/botan/src/pubkey/dlies/info.txt b/old/botan/src/pubkey/dlies/info.txt new file mode 100644 index 0000000..5138aaf --- /dev/null +++ b/old/botan/src/pubkey/dlies/info.txt @@ -0,0 +1,16 @@ +realname "DLIES" + +define DLIES + +load_on auto + +<add> +dlies.cpp +dlies.h +</add> + +<requires> +kdf +libstate +mac +</requires> |