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authorlloyd <lloyd@randombit.net>2014-01-10 03:41:59 +0000
committerlloyd <lloyd@randombit.net>2014-01-10 03:41:59 +0000
commit6894dca64c04936d07048c0e8cbf7e25858548c3 (patch)
tree5d572bfde9fe667dab14e3f04b5285a85d8acd95 /src/lib/pubkey/ecdh
parent9efa3be92442afb3d0b69890a36c7f122df18eda (diff)
Move lib into src
Diffstat (limited to 'src/lib/pubkey/ecdh')
-rw-r--r--src/lib/pubkey/ecdh/ecdh.cpp35
-rw-r--r--src/lib/pubkey/ecdh/ecdh.h107
-rw-r--r--src/lib/pubkey/ecdh/info.txt10
3 files changed, 152 insertions, 0 deletions
diff --git a/src/lib/pubkey/ecdh/ecdh.cpp b/src/lib/pubkey/ecdh/ecdh.cpp
new file mode 100644
index 000000000..0f93a0f97
--- /dev/null
+++ b/src/lib/pubkey/ecdh/ecdh.cpp
@@ -0,0 +1,35 @@
+/*
+* ECDH implemenation
+* (C) 2007 Manuel Hartl, FlexSecure GmbH
+* 2007 Falko Strenzke, FlexSecure GmbH
+* 2008-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/ecdh.h>
+
+namespace Botan {
+
+ECDH_KA_Operation::ECDH_KA_Operation(const ECDH_PrivateKey& key) :
+ curve(key.domain().get_curve()),
+ cofactor(key.domain().get_cofactor())
+ {
+ l_times_priv = inverse_mod(cofactor, key.domain().get_order()) *
+ key.private_value();
+ }
+
+secure_vector<byte> ECDH_KA_Operation::agree(const byte w[], size_t w_len)
+ {
+ PointGFp point = OS2ECP(w, w_len, curve);
+
+ PointGFp S = (cofactor * point) * l_times_priv;
+
+ BOTAN_ASSERT(S.on_the_curve(),
+ "ECDH agreed value was on the curve");
+
+ return BigInt::encode_1363(S.get_affine_x(),
+ curve.get_p().bytes());
+ }
+
+}
diff --git a/src/lib/pubkey/ecdh/ecdh.h b/src/lib/pubkey/ecdh/ecdh.h
new file mode 100644
index 000000000..0c5d4e010
--- /dev/null
+++ b/src/lib/pubkey/ecdh/ecdh.h
@@ -0,0 +1,107 @@
+/*
+* ECDH
+* (C) 2007 Falko Strenzke, FlexSecure GmbH
+* Manuel Hartl, FlexSecure GmbH
+* (C) 2008-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_ECDH_KEY_H__
+#define BOTAN_ECDH_KEY_H__
+
+#include <botan/ecc_key.h>
+#include <botan/pk_ops.h>
+
+namespace Botan {
+
+/**
+* This class represents ECDH Public Keys.
+*/
+class BOTAN_DLL ECDH_PublicKey : public virtual EC_PublicKey
+ {
+ public:
+
+ ECDH_PublicKey(const AlgorithmIdentifier& alg_id,
+ const secure_vector<byte>& key_bits) :
+ EC_PublicKey(alg_id, key_bits) {}
+
+ /**
+ * Construct a public key from a given public point.
+ * @param dom_par the domain parameters associated with this key
+ * @param public_point the public point defining this key
+ */
+ ECDH_PublicKey(const EC_Group& dom_par,
+ const PointGFp& public_point) :
+ EC_PublicKey(dom_par, public_point) {}
+
+ /**
+ * Get this keys algorithm name.
+ * @return this keys algorithm name
+ */
+ std::string algo_name() const { return "ECDH"; }
+
+ /**
+ * Get the maximum number of bits allowed to be fed to this key.
+ * This is the bitlength of the order of the base point.
+
+ * @return maximum number of input bits
+ */
+ size_t max_input_bits() const { return domain().get_order().bits(); }
+
+ /**
+ * @return public point value
+ */
+ std::vector<byte> public_value() const
+ { return unlock(EC2OSP(public_point(), PointGFp::UNCOMPRESSED)); }
+
+ protected:
+ ECDH_PublicKey() {}
+ };
+
+/**
+* This class represents ECDH Private Keys.
+*/
+class BOTAN_DLL ECDH_PrivateKey : public ECDH_PublicKey,
+ public EC_PrivateKey,
+ public PK_Key_Agreement_Key
+ {
+ public:
+
+ ECDH_PrivateKey(const AlgorithmIdentifier& alg_id,
+ const secure_vector<byte>& key_bits) :
+ EC_PrivateKey(alg_id, key_bits) {}
+
+ /**
+ * Generate a new private key
+ * @param rng a random number generator
+ * @param domain parameters to used for this key
+ * @param x the private key; if zero, a new random key is generated
+ */
+ ECDH_PrivateKey(RandomNumberGenerator& rng,
+ const EC_Group& domain,
+ const BigInt& x = 0) :
+ EC_PrivateKey(rng, domain, x) {}
+
+ std::vector<byte> public_value() const
+ { return ECDH_PublicKey::public_value(); }
+ };
+
+/**
+* ECDH operation
+*/
+class BOTAN_DLL ECDH_KA_Operation : public PK_Ops::Key_Agreement
+ {
+ public:
+ ECDH_KA_Operation(const ECDH_PrivateKey& key);
+
+ secure_vector<byte> agree(const byte w[], size_t w_len);
+ private:
+ const CurveGFp& curve;
+ const BigInt& cofactor;
+ BigInt l_times_priv;
+ };
+
+}
+
+#endif
diff --git a/src/lib/pubkey/ecdh/info.txt b/src/lib/pubkey/ecdh/info.txt
new file mode 100644
index 000000000..9277aca9b
--- /dev/null
+++ b/src/lib/pubkey/ecdh/info.txt
@@ -0,0 +1,10 @@
+define ECDH 20131128
+
+<requires>
+alloc
+asn1
+ec_group
+ecc_key
+libstate
+numbertheory
+</requires>