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removed own implementation of x25519

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orignal
2024-11-01 17:53:27 -04:00
parent b8d61e04f0
commit 0d09a8be00
7 changed files with 4 additions and 182 deletions
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82
libi2pd/Ed25519.cpp
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2013-2023, The PurpleI2P Project
* Copyright (c) 2013-2024, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
@@ -457,86 +457,6 @@ namespace crypto
}
}
#if !OPENSSL_X25519
BIGNUM * Ed25519::ScalarMul (const BIGNUM * u, const BIGNUM * k, BN_CTX * ctx) const
{
BN_CTX_start (ctx);
auto x1 = BN_CTX_get (ctx); BN_copy (x1, u);
auto x2 = BN_CTX_get (ctx); BN_one (x2);
auto z2 = BN_CTX_get (ctx); BN_zero (z2);
auto x3 = BN_CTX_get (ctx); BN_copy (x3, u);
auto z3 = BN_CTX_get (ctx); BN_one (z3);
auto c121666 = BN_CTX_get (ctx); BN_set_word (c121666, 121666);
auto tmp0 = BN_CTX_get (ctx); auto tmp1 = BN_CTX_get (ctx);
unsigned int swap = 0;
auto bits = BN_num_bits (k);
while(bits)
{
--bits;
auto k_t = BN_is_bit_set(k, bits) ? 1 : 0;
swap ^= k_t;
if (swap)
{
std::swap (x2, x3);
std::swap (z2, z3);
}
swap = k_t;
BN_mod_sub(tmp0, x3, z3, q, ctx);
BN_mod_sub(tmp1, x2, z2, q, ctx);
BN_mod_add(x2, x2, z2, q, ctx);
BN_mod_add(z2, x3, z3, q, ctx);
BN_mod_mul(z3, tmp0, x2, q, ctx);
BN_mod_mul(z2, z2, tmp1, q, ctx);
BN_mod_sqr(tmp0, tmp1, q, ctx);
BN_mod_sqr(tmp1, x2, q, ctx);
BN_mod_add(x3, z3, z2, q, ctx);
BN_mod_sub(z2, z3, z2, q, ctx);
BN_mod_mul(x2, tmp1, tmp0, q, ctx);
BN_mod_sub(tmp1, tmp1, tmp0, q, ctx);
BN_mod_sqr(z2, z2, q, ctx);
BN_mod_mul(z3, tmp1, c121666, q, ctx);
BN_mod_sqr(x3, x3, q, ctx);
BN_mod_add(tmp0, tmp0, z3, q, ctx);
BN_mod_mul(z3, x1, z2, q, ctx);
BN_mod_mul(z2, tmp1, tmp0, q, ctx);
}
if (swap)
{
std::swap (x2, x3);
std::swap (z2, z3);
}
BN_mod_inverse (z2, z2, q, ctx);
BIGNUM * res = BN_new (); // not from ctx
BN_mod_mul(res, x2, z2, q, ctx);
BN_CTX_end (ctx);
return res;
}
void Ed25519::ScalarMul (const uint8_t * p, const uint8_t * e, uint8_t * buf, BN_CTX * ctx) const
{
BIGNUM * p1 = DecodeBN<32> (p);
uint8_t k[32];
memcpy (k, e, 32);
k[0] &= 248; k[31] &= 127; k[31] |= 64;
BIGNUM * n = DecodeBN<32> (k);
BIGNUM * q1 = ScalarMul (p1, n, ctx);
EncodeBN (q1, buf, 32);
BN_free (p1); BN_free (n); BN_free (q1);
}
void Ed25519::ScalarMulB (const uint8_t * e, uint8_t * buf, BN_CTX * ctx) const
{
BIGNUM *p1 = BN_new (); BN_set_word (p1, 9);
uint8_t k[32];
memcpy (k, e, 32);
k[0] &= 248; k[31] &= 127; k[31] |= 64;
BIGNUM * n = DecodeBN<32> (k);
BIGNUM * q1 = ScalarMul (p1, n, ctx);
EncodeBN (q1, buf, 32);
BN_free (p1); BN_free (n); BN_free (q1);
}
#endif
void Ed25519::BlindPublicKey (const uint8_t * pub, const uint8_t * seed, uint8_t * blinded)
{
BN_CTX * ctx = BN_CTX_new ();