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-rw-r--r--src/pk/dlies/dlies.cpp129
-rw-r--r--src/pk/dlies/dlies.h53
-rw-r--r--src/pk/dlies/modinfo.txt10
3 files changed, 192 insertions, 0 deletions
diff --git a/src/pk/dlies/dlies.cpp b/src/pk/dlies/dlies.cpp
new file mode 100644
index 000000000..2a2f33925
--- /dev/null
+++ b/src/pk/dlies/dlies.cpp
@@ -0,0 +1,129 @@
+/*************************************************
+* DLIES Source File *
+* (C) 1999-2007 Jack Lloyd *
+*************************************************/
+
+#include <botan/dlies.h>
+#include <botan/lookup.h>
+#include <botan/look_pk.h>
+#include <botan/xor_buf.h>
+#include <memory>
+
+namespace Botan {
+
+/*************************************************
+* DLIES_Encryptor Constructor *
+*************************************************/
+DLIES_Encryptor::DLIES_Encryptor(const PK_Key_Agreement_Key& k,
+ const std::string& kdf,
+ const std::string& mac, u32bit mk_len) :
+ key(k), kdf_algo(kdf), mac_algo(mac), MAC_KEYLEN(mk_len)
+ {
+ }
+
+/*************************************************
+* 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");
+
+ std::auto_ptr<KDF> kdf(get_kdf(kdf_algo));
+ std::auto_ptr<MessageAuthenticationCode> mac(get_mac(mac_algo));
+
+ 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,
+ const std::string& kdf,
+ const std::string& mac, u32bit mk_len) :
+ key(k), kdf_algo(kdf), mac_algo(mac),
+ MAC_KEYLEN(mk_len), PUBLIC_LEN(key.public_value().size())
+ {
+ }
+
+/*************************************************
+* DLIES Decryption *
+*************************************************/
+SecureVector<byte> DLIES_Decryptor::dec(const byte msg[], u32bit length) const
+ {
+ std::auto_ptr<MessageAuthenticationCode> mac(get_mac(mac_algo));
+
+ if(length < PUBLIC_LEN + mac->OUTPUT_LENGTH)
+ throw Decoding_Error("DLIES decryption: ciphertext is too short");
+
+ std::auto_ptr<KDF> kdf(get_kdf(kdf_algo));
+
+ 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/src/pk/dlies/dlies.h b/src/pk/dlies/dlies.h
new file mode 100644
index 000000000..ef0f4d493
--- /dev/null
+++ b/src/pk/dlies/dlies.h
@@ -0,0 +1,53 @@
+/*************************************************
+* DLIES Header File *
+* (C) 1999-2007 Jack Lloyd *
+*************************************************/
+
+#ifndef BOTAN_DLIES_H__
+#define BOTAN_DLIES_H__
+
+#include <botan/pubkey.h>
+
+namespace Botan {
+
+/*************************************************
+* DLIES Encryption *
+*************************************************/
+class BOTAN_DLL DLIES_Encryptor : public PK_Encryptor
+ {
+ public:
+ DLIES_Encryptor(const PK_Key_Agreement_Key&,
+ const std::string& = "KDF2(SHA-160)",
+ const std::string& = "HMAC(SHA-160)", u32bit = 20);
+ 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;
+ const std::string kdf_algo;
+ const std::string mac_algo;
+ const u32bit MAC_KEYLEN;
+ };
+
+/*************************************************
+* DLIES Decryption *
+*************************************************/
+class BOTAN_DLL DLIES_Decryptor : public PK_Decryptor
+ {
+ public:
+ DLIES_Decryptor(const PK_Key_Agreement_Key&,
+ const std::string& = "KDF2(SHA-160)",
+ const std::string& = "HMAC(SHA-160)", u32bit = 20);
+ private:
+ SecureVector<byte> dec(const byte[], u32bit) const;
+ const PK_Key_Agreement_Key& key;
+ const std::string kdf_algo;
+ const std::string mac_algo;
+ const u32bit MAC_KEYLEN, PUBLIC_LEN;
+ };
+
+}
+
+#endif
diff --git a/src/pk/dlies/modinfo.txt b/src/pk/dlies/modinfo.txt
new file mode 100644
index 000000000..995dbe8a2
--- /dev/null
+++ b/src/pk/dlies/modinfo.txt
@@ -0,0 +1,10 @@
+realname "DLIES"
+
+define DLIES
+
+load_on auto
+
+<add>
+dlies.cpp
+dlies.h
+</add>
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