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/*
* OpenSSL PK operations
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/internal/openssl_engine.h>
#include <botan/internal/bn_wrap.h>
#if defined(BOTAN_HAS_RSA)
#include <botan/rsa.h>
#endif
#if defined(BOTAN_HAS_RW)
#include <botan/rw.h>
#endif
#if defined(BOTAN_HAS_DSA)
#include <botan/dsa.h>
#endif
#if defined(BOTAN_HAS_ELGAMAL)
#include <botan/elgamal.h>
#endif
#if defined(BOTAN_HAS_NYBERG_RUEPPEL)
#include <botan/nr.h>
#endif
#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
#include <botan/dh.h>
#endif
namespace Botan {
namespace {
#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
class OSSL_DH_KA_Operation : public PK_Ops::Key_Agreement
{
public:
OSSL_DH_KA_Operation(const DH_PrivateKey& dh) :
x(dh.get_x()), p(dh.group_p()) {}
SecureVector<byte> agree(const byte w[], u32bit w_len) const
{
OSSL_BN i(w, w_len), r;
BN_mod_exp(r.value, i.value, x.value, p.value, ctx.value);
return r.to_bytes();
}
private:
const OSSL_BN x, p;
OSSL_BN_CTX ctx;
};
#endif
#if defined(BOTAN_HAS_DSA)
class OSSL_DSA_Signature_Operation : public PK_Ops::Signature
{
public:
OSSL_DSA_Signature_Operation(const DSA_PrivateKey& dsa) :
x(dsa.get_x()),
p(dsa.group_p()),
q(dsa.group_q()),
g(dsa.group_g()),
q_bits(dsa.group_q().bits()) {}
u32bit message_parts() const { return 2; }
u32bit message_part_size() const { return (q_bits + 7) / 8; }
u32bit max_input_bits() const { return q_bits; }
SecureVector<byte> sign(const byte msg[], u32bit msg_len,
RandomNumberGenerator& rng) const;
private:
const OSSL_BN x, p, q, g;
const OSSL_BN_CTX ctx;
u32bit q_bits;
};
SecureVector<byte>
OSSL_DSA_Signature_Operation::sign(const byte msg[], u32bit msg_len,
RandomNumberGenerator& rng) const
{
const u32bit q_bytes = (q_bits + 7) / 8;
rng.add_entropy(msg, msg_len);
BigInt k_bn;
do
k_bn.randomize(rng, q_bits);
while(k_bn >= q.to_bigint());
OSSL_BN i(msg, msg_len);
OSSL_BN k(k_bn);
OSSL_BN r;
BN_mod_exp(r.value, g.value, k.value, p.value, ctx.value);
BN_nnmod(r.value, r.value, q.value, ctx.value);
BN_mod_inverse(k.value, k.value, q.value, ctx.value);
OSSL_BN s;
BN_mul(s.value, x.value, r.value, ctx.value);
BN_add(s.value, s.value, i.value);
BN_mod_mul(s.value, s.value, k.value, q.value, ctx.value);
if(BN_is_zero(r.value) || BN_is_zero(s.value))
throw Internal_Error("OpenSSL_DSA_Op::sign: r or s was zero");
SecureVector<byte> output(2*q_bytes);
r.encode(output, q_bytes);
s.encode(output + q_bytes, q_bytes);
return output;
}
class OSSL_DSA_Verification_Operation : public PK_Ops::Verification
{
public:
OSSL_DSA_Verification_Operation(const DSA_PublicKey& dsa) :
y(dsa.get_y()),
p(dsa.group_p()),
q(dsa.group_q()),
g(dsa.group_g()),
q_bits(dsa.group_q().bits()) {}
u32bit message_parts() const { return 2; }
u32bit message_part_size() const { return (q_bits + 7) / 8; }
u32bit max_input_bits() const { return q_bits; }
bool with_recovery() const { return false; }
bool verify(const byte msg[], u32bit msg_len,
const byte sig[], u32bit sig_len) const;
private:
const OSSL_BN y, p, q, g;
const OSSL_BN_CTX ctx;
u32bit q_bits;
};
bool OSSL_DSA_Verification_Operation::verify(const byte msg[], u32bit msg_len,
const byte sig[], u32bit sig_len) const
{
const u32bit q_bytes = q.bytes();
if(sig_len != 2*q_bytes || msg_len > q_bytes)
return false;
OSSL_BN r(sig, q_bytes);
OSSL_BN s(sig + q_bytes, q_bytes);
OSSL_BN i(msg, msg_len);
if(BN_is_zero(r.value) || BN_cmp(r.value, q.value) >= 0)
return false;
if(BN_is_zero(s.value) || BN_cmp(s.value, q.value) >= 0)
return false;
if(BN_mod_inverse(s.value, s.value, q.value, ctx.value) == 0)
return false;
OSSL_BN si;
BN_mod_mul(si.value, s.value, i.value, q.value, ctx.value);
BN_mod_exp(si.value, g.value, si.value, p.value, ctx.value);
OSSL_BN sr;
BN_mod_mul(sr.value, s.value, r.value, q.value, ctx.value);
BN_mod_exp(sr.value, y.value, sr.value, p.value, ctx.value);
BN_mod_mul(si.value, si.value, sr.value, p.value, ctx.value);
BN_nnmod(si.value, si.value, q.value, ctx.value);
if(BN_cmp(si.value, r.value) == 0)
return true;
return false;
return false;
}
#endif
#if defined(BOTAN_HAS_RSA)
class OSSL_RSA_Private_Operation : public PK_Ops::Signature,
public PK_Ops::Decryption
{
public:
OSSL_RSA_Private_Operation(const RSA_PrivateKey& rsa) :
mod(rsa.get_n()),
p(rsa.get_p()),
q(rsa.get_q()),
d1(rsa.get_d1()),
d2(rsa.get_d2()),
c(rsa.get_c()),
n_bits(rsa.get_n().bits())
{}
u32bit max_input_bits() const { return (n_bits - 1); }
SecureVector<byte> sign(const byte msg[], u32bit msg_len,
RandomNumberGenerator& rng) const
{
BigInt m(msg, msg_len);
BigInt x = private_op(m);
return BigInt::encode_1363(x, (n_bits + 7) / 8);
}
SecureVector<byte> decrypt(const byte msg[], u32bit msg_len) const
{
BigInt m(msg, msg_len);
return BigInt::encode(private_op(m));
}
private:
BigInt private_op(const BigInt& m) const;
const OSSL_BN mod, p, q, d1, d2, c;
const OSSL_BN_CTX ctx;
u32bit n_bits;
};
BigInt OSSL_RSA_Private_Operation::private_op(const BigInt& m) const
{
OSSL_BN j1, j2, h(m);
BN_mod_exp(j1.value, h.value, d1.value, p.value, ctx.value);
BN_mod_exp(j2.value, h.value, d2.value, q.value, ctx.value);
BN_sub(h.value, j1.value, j2.value);
BN_mod_mul(h.value, h.value, c.value, p.value, ctx.value);
BN_mul(h.value, h.value, q.value, ctx.value);
BN_add(h.value, h.value, j2.value);
return h.to_bigint();
}
class OSSL_RSA_Public_Operation : public PK_Ops::Verification,
public PK_Ops::Encryption
{
public:
OSSL_RSA_Public_Operation(const RSA_PublicKey& rsa) :
n(rsa.get_n()), e(rsa.get_e()), mod(rsa.get_n())
{}
u32bit max_input_bits() const { return (n.bits() - 1); }
bool with_recovery() const { return true; }
SecureVector<byte> encrypt(const byte msg[], u32bit msg_len,
RandomNumberGenerator&) const
{
BigInt m(msg, msg_len);
return BigInt::encode_1363(public_op(m), n.bytes());
}
SecureVector<byte> verify_mr(const byte msg[], u32bit msg_len) const
{
BigInt m(msg, msg_len);
return BigInt::encode(public_op(m));
}
private:
BigInt public_op(const BigInt& m) const
{
if(m >= n)
throw Invalid_Argument("RSA public op - input is too large");
OSSL_BN m_bn(m), r;
BN_mod_exp(r.value, m_bn.value, e.value, mod.value, ctx.value);
return r.to_bigint();
}
const BigInt& n;
const OSSL_BN e, mod;
const OSSL_BN_CTX ctx;
};
#endif
}
PK_Ops::Key_Agreement*
OpenSSL_Engine::get_key_agreement_op(const Private_Key& key) const
{
#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
if(const DH_PrivateKey* dh = dynamic_cast<const DH_PrivateKey*>(&key))
return new OSSL_DH_KA_Operation(*dh);
#endif
return 0;
}
PK_Ops::Signature*
OpenSSL_Engine::get_signature_op(const Private_Key& key) const
{
#if defined(BOTAN_HAS_RSA)
if(const RSA_PrivateKey* s = dynamic_cast<const RSA_PrivateKey*>(&key))
return new OSSL_RSA_Private_Operation(*s);
#endif
#if defined(BOTAN_HAS_DSA)
if(const DSA_PrivateKey* s = dynamic_cast<const DSA_PrivateKey*>(&key))
return new OSSL_DSA_Signature_Operation(*s);
#endif
return 0;
}
PK_Ops::Verification*
OpenSSL_Engine::get_verify_op(const Public_Key& key) const
{
#if defined(BOTAN_HAS_RSA)
if(const RSA_PublicKey* s = dynamic_cast<const RSA_PublicKey*>(&key))
return new OSSL_RSA_Public_Operation(*s);
#endif
#if defined(BOTAN_HAS_DSA)
if(const DSA_PublicKey* s = dynamic_cast<const DSA_PublicKey*>(&key))
return new OSSL_DSA_Verification_Operation(*s);
#endif
return 0;
}
PK_Ops::Encryption*
OpenSSL_Engine::get_encryption_op(const Public_Key& key) const
{
#if defined(BOTAN_HAS_RSA)
if(const RSA_PublicKey* s = dynamic_cast<const RSA_PublicKey*>(&key))
return new OSSL_RSA_Public_Operation(*s);
#endif
return 0;
}
PK_Ops::Decryption*
OpenSSL_Engine::get_decryption_op(const Private_Key& key) const
{
#if defined(BOTAN_HAS_RSA)
if(const RSA_PrivateKey* s = dynamic_cast<const RSA_PrivateKey*>(&key))
return new OSSL_RSA_Private_Operation(*s);
#endif
return 0;
}
}
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