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-rw-r--r--src/build-data/buildh.in1
-rw-r--r--src/math/numbertheory/blinding.cpp49
-rw-r--r--src/math/numbertheory/blinding.h34
-rw-r--r--src/math/numbertheory/info.txt2
-rw-r--r--src/pubkey/blinding.cpp76
-rw-r--r--src/pubkey/blinding.h51
-rw-r--r--src/pubkey/dh/dh.cpp16
-rw-r--r--src/pubkey/dh/dh.h19
-rw-r--r--src/pubkey/elgamal/elgamal.cpp9
-rw-r--r--src/pubkey/elgamal/elgamal.h2
-rw-r--r--src/pubkey/info.txt2
-rw-r--r--src/pubkey/rsa/rsa.cpp7
-rw-r--r--src/pubkey/rsa/rsa.h2
-rw-r--r--src/pubkey/rw/rw.cpp6
-rw-r--r--src/pubkey/rw/rw.h2
15 files changed, 175 insertions, 103 deletions
diff --git a/src/build-data/buildh.in b/src/build-data/buildh.in
index 6412d8a6a..724801040 100644
--- a/src/build-data/buildh.in
+++ b/src/build-data/buildh.in
@@ -20,7 +20,6 @@
#define BOTAN_MP_WORD_BITS %{mp_bits}
#define BOTAN_KARAT_MUL_THRESHOLD 32
#define BOTAN_KARAT_SQR_THRESHOLD 32
-#define BOTAN_PRIVATE_KEY_OP_BLINDING_BITS 64
/* PK key consistency checking toggles */
#define BOTAN_PUBLIC_KEY_STRONG_CHECKS_ON_LOAD 1
diff --git a/src/math/numbertheory/blinding.cpp b/src/math/numbertheory/blinding.cpp
deleted file mode 100644
index c6a3fd1bd..000000000
--- a/src/math/numbertheory/blinding.cpp
+++ /dev/null
@@ -1,49 +0,0 @@
-/*
-* Blinder
-* (C) 1999-2007 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#include <botan/blinding.h>
-#include <botan/numthry.h>
-
-namespace Botan {
-
-/*
-* Blinder Constructor
-*/
-Blinder::Blinder(const BigInt& e, const BigInt& d, const BigInt& n)
- {
- if(e < 1 || d < 1 || n < 1)
- throw Invalid_Argument("Blinder: Arguments too small");
-
- reducer = Modular_Reducer(n);
- this->e = e;
- this->d = d;
- }
-
-/*
-* Blind a number
-*/
-BigInt Blinder::blind(const BigInt& i) const
- {
- if(!reducer.initialized())
- return i;
-
- e = reducer.square(e);
- d = reducer.square(d);
- return reducer.multiply(i, e);
- }
-
-/*
-* Unblind a number
-*/
-BigInt Blinder::unblind(const BigInt& i) const
- {
- if(!reducer.initialized())
- return i;
- return reducer.multiply(i, d);
- }
-
-}
diff --git a/src/math/numbertheory/blinding.h b/src/math/numbertheory/blinding.h
deleted file mode 100644
index 5f7f9e6b7..000000000
--- a/src/math/numbertheory/blinding.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
-* Blinder
-* (C) 1999-2007 Jack Lloyd
-*
-* Distributed under the terms of the Botan license
-*/
-
-#ifndef BOTAN_BLINDER_H__
-#define BOTAN_BLINDER_H__
-
-#include <botan/bigint.h>
-#include <botan/reducer.h>
-
-namespace Botan {
-
-/*
-* Blinding Function Object
-*/
-class BOTAN_DLL Blinder
- {
- public:
- BigInt blind(const BigInt&) const;
- BigInt unblind(const BigInt&) const;
-
- Blinder() {}
- Blinder(const BigInt&, const BigInt&, const BigInt&);
- private:
- Modular_Reducer reducer;
- mutable BigInt e, d;
- };
-
-}
-
-#endif
diff --git a/src/math/numbertheory/info.txt b/src/math/numbertheory/info.txt
index 58851e055..18349ef78 100644
--- a/src/math/numbertheory/info.txt
+++ b/src/math/numbertheory/info.txt
@@ -3,7 +3,6 @@ load_on auto
define BIGINT_MATH
<header:public>
-blinding.h
curve_gfp.h
numthry.h
point_gfp.h
@@ -16,7 +15,6 @@ def_powm.h
</header:internal>
<source>
-blinding.cpp
dsa_gen.cpp
jacobi.cpp
make_prm.cpp
diff --git a/src/pubkey/blinding.cpp b/src/pubkey/blinding.cpp
new file mode 100644
index 000000000..2bb6680d6
--- /dev/null
+++ b/src/pubkey/blinding.cpp
@@ -0,0 +1,76 @@
+/*
+* Blinding for public key operations
+* (C) 1999-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/blinding.h>
+#include <botan/numthry.h>
+#include <botan/libstate.h>
+#include <botan/hash.h>
+#include <botan/time.h>
+#include <botan/loadstor.h>
+#include <memory>
+
+namespace Botan {
+
+/*
+* Blinder Constructor
+*/
+Blinder::Blinder(const BigInt& e, const BigInt& d, const BigInt& n)
+ {
+ if(e < 1 || d < 1 || n < 1)
+ throw Invalid_Argument("Blinder: Arguments too small");
+
+ reducer = Modular_Reducer(n);
+ this->e = e;
+ this->d = d;
+ }
+
+BigInt Blinder::choose_nonce(const BigInt& x, const BigInt& mod)
+ {
+ Algorithm_Factory& af = global_state().algorithm_factory();
+
+ std::auto_ptr<HashFunction> hash(af.make_hash_function("SHA-512"));
+
+ u64bit ns_clock = get_nanoseconds_clock();
+ for(size_t i = 0; i != sizeof(ns_clock); ++i)
+ hash->update(get_byte(0, ns_clock));
+
+ hash->update(BigInt::encode(x));
+ hash->update(BigInt::encode(mod));
+
+ u64bit timestamp = system_time();
+ for(size_t i = 0; i != sizeof(timestamp); ++i)
+ hash->update(get_byte(0, timestamp));
+
+ SecureVector<byte> r = hash->final();
+
+ return BigInt::decode(r) % mod;
+ }
+
+/*
+* Blind a number
+*/
+BigInt Blinder::blind(const BigInt& i) const
+ {
+ if(!reducer.initialized())
+ return i;
+
+ e = reducer.square(e);
+ d = reducer.square(d);
+ return reducer.multiply(i, e);
+ }
+
+/*
+* Unblind a number
+*/
+BigInt Blinder::unblind(const BigInt& i) const
+ {
+ if(!reducer.initialized())
+ return i;
+ return reducer.multiply(i, d);
+ }
+
+}
diff --git a/src/pubkey/blinding.h b/src/pubkey/blinding.h
new file mode 100644
index 000000000..d1d9a8875
--- /dev/null
+++ b/src/pubkey/blinding.h
@@ -0,0 +1,51 @@
+/*
+* Blinding for public key operations
+* (C) 1999-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_BLINDER_H__
+#define BOTAN_BLINDER_H__
+
+#include <botan/bigint.h>
+#include <botan/reducer.h>
+
+namespace Botan {
+
+/*
+* Blinding Function Object
+*/
+class BOTAN_DLL Blinder
+ {
+ public:
+ BigInt blind(const BigInt& x) const;
+ BigInt unblind(const BigInt& x) const;
+
+ /**
+ * Choose a nonce to use for blinding
+ * @param x a secret seed value
+ * @param mod the modulus
+ */
+ static BigInt choose_nonce(const BigInt& x, const BigInt& mod);
+
+ Blinder() {}
+
+ /**
+ * Construct a blinder
+ * @param mask the forward (blinding) mask
+ * @param inverse_mask the inverse of mask (depends on algo)
+ * @param modulus of the group operations are performed in
+ */
+ Blinder(const BigInt& mask,
+ const BigInt& inverse_mask,
+ const BigInt& modulus);
+
+ private:
+ Modular_Reducer reducer;
+ mutable BigInt e, d;
+ };
+
+}
+
+#endif
diff --git a/src/pubkey/dh/dh.cpp b/src/pubkey/dh/dh.cpp
index 70791fee4..b242bf8c0 100644
--- a/src/pubkey/dh/dh.cpp
+++ b/src/pubkey/dh/dh.cpp
@@ -75,4 +75,20 @@ MemoryVector<byte> DH_PrivateKey::public_value() const
return DH_PublicKey::public_value();
}
+DH_KA_Operation::DH_KA_Operation(const DH_PrivateKey& dh) :
+ p(dh.group_p()), powermod_x_p(dh.get_x(), p)
+ {
+ BigInt k = Blinder::choose_nonce(dh.get_x(), p);
+ blinder = Blinder(k, power_mod(inverse_mod(k, p), dh.get_x(), p), p);
+ }
+
+SecureVector<byte> DH_KA_Operation::agree(const byte w[], u32bit w_len) const
+ {
+ BigInt input = BigInt::decode(w, w_len);
+
+ BigInt r = blinder.unblind(powermod_x_p(blinder.blind(input)));
+
+ return BigInt::encode_1363(r, p.bytes());
+ }
+
}
diff --git a/src/pubkey/dh/dh.h b/src/pubkey/dh/dh.h
index ed8caf0c1..0cc2aaabc 100644
--- a/src/pubkey/dh/dh.h
+++ b/src/pubkey/dh/dh.h
@@ -10,6 +10,7 @@
#include <botan/dl_algo.h>
#include <botan/pow_mod.h>
+#include <botan/blinding.h>
#include <botan/pk_ops.h>
namespace Botan {
@@ -77,22 +78,14 @@ class BOTAN_DLL DH_PrivateKey : public DH_PublicKey,
class BOTAN_DLL DH_KA_Operation : public PK_Ops::Key_Agreement
{
public:
+ DH_KA_Operation(const DH_PrivateKey& key);
- DH_KA_Operation(const DH_PrivateKey& key) :
- powermod_x_p(key.get_x(), key.get_domain().get_p()),
- p_bytes(key.get_domain().get_p().bytes())
- {}
-
- SecureVector<byte> agree(const byte w[], u32bit w_len) const
- {
- return BigInt::encode_1363(
- powermod_x_p(BigInt::decode(w, w_len)),
- p_bytes);
- }
-
+ SecureVector<byte> agree(const byte w[], u32bit w_len) const;
private:
+ const BigInt& p;
+
Fixed_Exponent_Power_Mod powermod_x_p;
- u32bit p_bytes;
+ Blinder blinder;
};
}
diff --git a/src/pubkey/elgamal/elgamal.cpp b/src/pubkey/elgamal/elgamal.cpp
index fe83b3b2b..b2ffe36f3 100644
--- a/src/pubkey/elgamal/elgamal.cpp
+++ b/src/pubkey/elgamal/elgamal.cpp
@@ -117,6 +117,9 @@ ElGamal_Decryption_Operation::ElGamal_Decryption_Operation(const ElGamal_Private
powermod_x_p = Fixed_Exponent_Power_Mod(key.get_x(), p);
mod_p = Modular_Reducer(p);
+
+ BigInt k = Blinder::choose_nonce(key.get_x(), p);
+ blinder = Blinder(k, power_mod(k, key.get_x(), p), p);
}
SecureVector<byte>
@@ -135,7 +138,11 @@ ElGamal_Decryption_Operation::decrypt(const byte msg[], u32bit msg_len) const
if(a >= p || b >= p)
throw Invalid_Argument("ElGamal decryption: Invalid message");
- return BigInt::encode(mod_p.multiply(b, inverse_mod(powermod_x_p(a), p)));
+ a = blinder.blind(a);
+
+ BigInt r = mod_p.multiply(b, inverse_mod(powermod_x_p(a), p));
+
+ return BigInt::encode(blinder.unblind(r));
}
}
diff --git a/src/pubkey/elgamal/elgamal.h b/src/pubkey/elgamal/elgamal.h
index dad9dbc3e..c94779e96 100644
--- a/src/pubkey/elgamal/elgamal.h
+++ b/src/pubkey/elgamal/elgamal.h
@@ -11,6 +11,7 @@
#include <botan/dl_algo.h>
#include <botan/numthry.h>
#include <botan/reducer.h>
+#include <botan/blinding.h>
#include <botan/pk_ops.h>
namespace Botan {
@@ -80,6 +81,7 @@ class BOTAN_DLL ElGamal_Decryption_Operation : public PK_Ops::Decryption
private:
Fixed_Exponent_Power_Mod powermod_x_p;
Modular_Reducer mod_p;
+ Blinder blinder;
};
}
diff --git a/src/pubkey/info.txt b/src/pubkey/info.txt
index a4a5bfc71..956a5e369 100644
--- a/src/pubkey/info.txt
+++ b/src/pubkey/info.txt
@@ -1,6 +1,7 @@
define PUBLIC_KEY_CRYPTO
<source>
+blinding.cpp
pk_algs.cpp
pk_keys.cpp
pkcs8.cpp
@@ -11,6 +12,7 @@ x509_key.cpp
</source>
<header:public>
+blinding.h
pk_keys.h
pk_ops.h
pkcs8.h
diff --git a/src/pubkey/rsa/rsa.cpp b/src/pubkey/rsa/rsa.cpp
index 984d030ef..2ac001a31 100644
--- a/src/pubkey/rsa/rsa.cpp
+++ b/src/pubkey/rsa/rsa.cpp
@@ -79,6 +79,8 @@ RSA_Private_Operation::RSA_Private_Operation(const RSA_PrivateKey& rsa) :
powermod_d2_q(rsa.get_d2(), rsa.get_q()),
mod_p(rsa.get_p())
{
+ BigInt k = Blinder::choose_nonce(rsa.get_d(), n);
+ blinder = Blinder(power_mod(k, rsa.get_e(), n), inverse_mod(k, n), n);
}
BigInt RSA_Private_Operation::private_op(const BigInt& m) const
@@ -99,7 +101,7 @@ RSA_Private_Operation::sign(const byte msg[], u32bit msg_len,
RandomNumberGenerator&) const
{
BigInt m(msg, msg_len);
- BigInt x = private_op(m);
+ BigInt x = blinder.unblind(private_op(blinder.blind(m)));
return BigInt::encode_1363(x, n.bytes());
}
@@ -110,7 +112,8 @@ SecureVector<byte>
RSA_Private_Operation::decrypt(const byte msg[], u32bit msg_len) const
{
BigInt m(msg, msg_len);
- return BigInt::encode(private_op(m));
+ BigInt x = blinder.unblind(private_op(blinder.blind(m)));
+ return BigInt::encode(x);
}
}
diff --git a/src/pubkey/rsa/rsa.h b/src/pubkey/rsa/rsa.h
index cf81e0f3b..fc84b36df 100644
--- a/src/pubkey/rsa/rsa.h
+++ b/src/pubkey/rsa/rsa.h
@@ -10,6 +10,7 @@
#include <botan/if_algo.h>
#include <botan/reducer.h>
+#include <botan/blinding.h>
namespace Botan {
@@ -110,6 +111,7 @@ class BOTAN_DLL RSA_Private_Operation : public PK_Ops::Signature,
const BigInt& c;
Fixed_Exponent_Power_Mod powermod_d1_p, powermod_d2_q;
Modular_Reducer mod_p;
+ Blinder blinder;
};
class BOTAN_DLL RSA_Public_Operation : public PK_Ops::Verification,
diff --git a/src/pubkey/rw/rw.cpp b/src/pubkey/rw/rw.cpp
index b2bf2f916..af2b849ff 100644
--- a/src/pubkey/rw/rw.cpp
+++ b/src/pubkey/rw/rw.cpp
@@ -81,6 +81,8 @@ RW_Signature_Operation::RW_Signature_Operation(const RW_PrivateKey& rw) :
powermod_d2_q(rw.get_d2(), rw.get_q()),
mod_p(rw.get_p())
{
+ BigInt k = Blinder::choose_nonce(rw.get_d(), n);
+ blinder = Blinder(power_mod(k, rw.get_e(), n), inverse_mod(k, n), n);
}
SecureVector<byte>
@@ -95,11 +97,13 @@ RW_Signature_Operation::sign(const byte msg[], u32bit msg_len,
if(jacobi(i, n) != 1)
i >>= 1;
+ i = blinder.blind(i);
+
BigInt j1 = powermod_d1_p(i);
BigInt j2 = powermod_d2_q(i);
j1 = mod_p.reduce(sub_mul(j1, j2, c));
- BigInt r = mul_add(j1, q, j2);
+ BigInt r = blinder.unblind(mul_add(j1, q, j2));
r = std::min(r, n - r);
diff --git a/src/pubkey/rw/rw.h b/src/pubkey/rw/rw.h
index 8ca8d18b0..25e7be634 100644
--- a/src/pubkey/rw/rw.h
+++ b/src/pubkey/rw/rw.h
@@ -10,6 +10,7 @@
#include <botan/if_algo.h>
#include <botan/reducer.h>
+#include <botan/blinding.h>
namespace Botan {
@@ -73,6 +74,7 @@ class BOTAN_DLL RW_Signature_Operation : public PK_Ops::Signature
Fixed_Exponent_Power_Mod powermod_d1_p, powermod_d2_q;
Modular_Reducer mod_p;
+ Blinder blinder;
};
class BOTAN_DLL RW_Verification_Operation : public PK_Ops::Verification
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 22:31:55 +0000