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check AES tag first

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orignal 2020-01-02 13:30:54 -05:00
parent 9f79bdae9b
commit 5337aa10f7
1 changed files with 8 additions and 7 deletions
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15
libi2pd/Garlic.cpp
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@ -435,13 +435,8 @@ namespace garlic
return;
}
buf += 4; // length
if (GetEncryptionType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RARCHET)
{
HandleECIESx25519 (buf, length - 4);
return;
}
// otherwise assume ElGamal/AES
auto it = m_Tags.find (SessionTag(buf));
// AES tag might be used even if encryption type is not ElGamal/AES
if (it != m_Tags.end ())
{
// tag found. Use AES
@ -460,7 +455,13 @@ namespace garlic
}
else
{
// tag not found. Use ElGamal
// tag not found. Handle depending on encryption type
if (GetEncryptionType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD_RARCHET)
{
HandleECIESx25519 (buf, length - 4);
return;
}
// otherwise assume ElGamal/AES
ElGamalBlock elGamal;
if (length >= 514 && Decrypt (buf, (uint8_t *)&elGamal, m_Ctx))
{