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check if x25519 key is valid

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orignal 2021-01-01 15:03:11 -05:00
parent ce9640773c
commit 726bd0d63b
6 changed files with 52 additions and 13 deletions
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5
libi2pd/Crypto.cpp
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@ -351,11 +351,13 @@ namespace crypto
#endif
}
void X25519Keys::Agree (const uint8_t * pub, uint8_t * shared)
bool X25519Keys::Agree (const uint8_t * pub, uint8_t * shared)
{
if (pub[31] & 0x80) return false; // not x25519 key
#if OPENSSL_X25519
EVP_PKEY_derive_init (m_Ctx);
auto pkey = EVP_PKEY_new_raw_public_key (EVP_PKEY_X25519, NULL, pub, 32);
if (!pkey) return false;
EVP_PKEY_derive_set_peer (m_Ctx, pkey);
size_t len = 32;
EVP_PKEY_derive (m_Ctx, shared, &len);
@ -363,6 +365,7 @@ namespace crypto
#else
GetEd25519 ()->ScalarMul (pub, m_PrivateKey, shared, m_Ctx);
#endif
return true;
}
void X25519Keys::GetPrivateKey (uint8_t * priv) const