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i2pd/libi2pd/PostQuantum.cpp
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/*
* Copyright (c) 2025-2026, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#include "Log.h"
#include "PostQuantum.h"
#if OPENSSL_PQ
#ifndef LIBRESSL_VERSION_NUMBER
# include <openssl/param_build.h>
# include <openssl/core_names.h>
# warning like you use openssl
#else
# warning like you use libressl
# include<openssl/mlkem.h>
#endif
#define DEF_RANK MLKEM768_RANK
namespace i2p
{
namespace crypto
{
MLKEMKeys::MLKEMKeys (MLKEMTypes type):
m_Name (std::get<0>(MLKEMS[type])), m_KeyLen (std::get<1>(MLKEMS[type])),
m_CTLen (std::get<2>(MLKEMS[type])), m_Pkey (nullptr)
{
}
void MLKEMKeys::FreeKeys(void)
{
#ifndef LIBRESSL_VERSION_NUMBER
if (m_Pkey) EVP_PKEY_free (m_Pkey);
#else
if (m_Pkey) MLKEM_private_key_free (m_Pkey);
#endif
if (m_Pkey) m_Pkey = nullptr;
}
MLKEMKeys::~MLKEMKeys ()
{
FreeKeys();
LogPrint(eLogDebug, "MLKEM: FreeKeys ");
}
void MLKEMKeys::GenerateKeys ()
{
FreeKeys();
#ifndef LIBRESSL_VERSION_NUMBER
m_Pkey = EVP_PKEY_Q_keygen(NULL, NULL, m_Name.c_str ());
LogPrint(eLogDebug, "MLKEM: GenerateKeys [ openssl ]");
#else
m_Pkey = MLKEM_private_key_new(DEF_RANK);
uint8_t * pub_key = nullptr;
size_t pub_key_len = 0;
uint8_t * seed = nullptr;
size_t seed_len = 0;
if (MLKEM_generate_key(m_Pkey, &pub_key, &pub_key_len, &seed, &seed_len) == 1)
{
LogPrint(eLogDebug, "MLKEM: GenerateKeys [ libressl ] success");
if (pub_key_len <= sizeof(m_CachedPub))
{
memcpy(m_CachedPub, pub_key, pub_key_len);
m_IsPubCached = true;
LogPrint(eLogDebug, "MLKEM [libressl] cache the pub succes");
} else
{
LogPrint(eLogError, "MLKEM: can't cache private key [libressl]");
}
OPENSSL_free(pub_key);
if (seed) OPENSSL_free(seed);
} else
{
LogPrint(eLogError, "MLKEM: GenerateKeys [ libressl ] failed");
MLKEM_private_key_free(m_Pkey);
m_Pkey = nullptr;
}
#endif
} // end method
void MLKEMKeys::GetPublicKey (uint8_t * pub) const
{
if (m_Pkey)
{
#ifndef LIBRESSL_VERSION_NUMBER
size_t len = m_KeyLen;
EVP_PKEY_get_octet_string_param (m_Pkey, OSSL_PKEY_PARAM_PUB_KEY, pub, m_KeyLen, &len);
#else
if (!m_Pkey) return;
LogPrint(eLogDebug, "MLKEM: GetPublicKey [ libressl ]");
if (m_IsPubCached)
{
memcpy(pub, m_CachedPub, MLKEM768_KEY_LENGTH);
LogPrint(eLogDebug,"MLKEM [libressl]: copy pubkey");
} else
{
LogPrint(eLogError, "MLKEM: Public key not cached!");
}
#endif
}
}
void MLKEMKeys::SetPublicKey (const uint8_t * pub)
{
if(!m_Pkey) return LogPrint(eLogError, "We are don't have private key for set public key");
#ifndef LIBRESSL_VERSION_NUMBER
OSSL_PARAM params[] = {
OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_PUB_KEY, (void*)pub, m_KeyLen),
OSSL_PARAM_END
};
EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_from_name(NULL, m_Name.c_str(), NULL);
if (ctx)
{
EVP_PKEY_fromdata_init(ctx);
if (EVP_PKEY_fromdata(ctx, &m_Pkey, OSSL_KEYMGMT_SELECT_PUBLIC_KEY, params) <= 0) {
LogPrint(eLogError, "MLKEM: Failed to set public key data");
}
EVP_PKEY_CTX_free(ctx);
} else
{
LogPrint(eLogError, "MLKEM: can't create PKEY context");
}
#else
MLKEM_public_key * pub_key = MLKEM_public_key_new(DEF_RANK);
if (MLKEM_parse_public_key(pub_key, pub, m_KeyLen))
{
memcpy(m_CachedPub, pub, m_KeyLen);
m_IsPubCached = true;
LogPrint(eLogDebug, "MLKEM: SetPublicKey [ libressl ] success");
}
else
{
LogPrint(eLogError, "MLKEM: failed to parse public key");
}
if (pub_key) MLKEM_public_key_free(pub_key);
#endif
}
void MLKEMKeys::Encaps (uint8_t * ciphertext, uint8_t * shared)
{
if (!m_Pkey)
{
LogPrint(eLogDebug, "MLKEM encaps failed, not found priv key");
GenerateKeys();
if (!m_Pkey)
{
LogPrint(eLogError, "MLKEM: Failed to generate keys for Encaps");
return;
}
}
#ifndef LIBRESSL_VERSION_NUMBER
auto ctx = EVP_PKEY_CTX_new_from_pkey (NULL, m_Pkey, NULL);
if (ctx)
{
EVP_PKEY_encapsulate_init (ctx, NULL);
size_t len = m_CTLen, sharedLen = 32;
EVP_PKEY_encapsulate (ctx, ciphertext, &len, shared, &sharedLen);
EVP_PKEY_CTX_free (ctx);
}
else
LogPrint (eLogError, "MLKEM can't create PKEY context");
#else
auto pub_key = MLKEM_public_key_new(DEF_RANK);
if (MLKEM_public_from_private(m_Pkey, pub_key) != 1) {
LogPrint(eLogError, "MLKEM can't get public from private");
return;
}
uint8_t * out_ct = nullptr;
size_t out_ct_len = 0;
uint8_t * out_ss = nullptr;
size_t out_ss_len = 0;
if (MLKEM_encap(pub_key, &out_ct, &out_ct_len, &out_ss, &out_ss_len) == 1) {
memcpy(ciphertext, out_ct, out_ct_len);
memcpy(shared, out_ss, out_ss_len);
OPENSSL_cleanse(out_ct, out_ct_len);
OPENSSL_cleanse(out_ss, out_ss_len);
OPENSSL_free(out_ct);
OPENSSL_free(out_ss);
LogPrint(eLogDebug, "MLKEM [libressl] succesfully encaps");
}
else
{
LogPrint(eLogError, "MLKEM [libressl]: encapsulation failed");
}
MLKEM_public_key_free(pub_key);
#endif
}
void MLKEMKeys::Decaps (const uint8_t * ciphertext, uint8_t * shared)
{
if (!m_Pkey) return;
#ifndef LIBRESSL_VERSION_NUMBER
auto ctx = EVP_PKEY_CTX_new_from_pkey (NULL, m_Pkey, NULL);
if (ctx)
{
EVP_PKEY_decapsulate_init (ctx, NULL);
size_t sharedLen = 32;
EVP_PKEY_decapsulate (ctx, shared, &sharedLen, ciphertext, m_CTLen);
EVP_PKEY_CTX_free (ctx);
}
else
LogPrint (eLogError, "MLKEM can't create PKEY context");
#else
uint8_t * out_shared_secret = nullptr;
size_t out_shared_secret_len = 0;
if (MLKEM_decap(m_Pkey, ciphertext, m_CTLen, &out_shared_secret, &out_shared_secret_len) == 1)
{
memcpy(shared, out_shared_secret, out_shared_secret_len);
OPENSSL_cleanse(out_shared_secret, out_shared_secret_len);
OPENSSL_free(out_shared_secret);
LogPrint(eLogDebug, "MLKEM [libressl] succesfully decrypt");
}
else
{
LogPrint(eLogError, "MLKEM [libressl]: decapsulation failed");
}
#endif
}
std::unique_ptr<MLKEMKeys> CreateMLKEMKeys (i2p::data::CryptoKeyType type)
{
if (type <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ||
type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD > (int)MLKEMS.size ()) return nullptr;
return std::make_unique<MLKEMKeys>((MLKEMTypes)(type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD - 1));
}
static constexpr std::array NoiseIKInitMLKEMKeys =
{
std::make_pair
(
std::array<uint8_t, 32>
{
0xb0, 0x8f, 0xb1, 0x73, 0x92, 0x66, 0xc9, 0x90, 0x45, 0x7f, 0xdd, 0xc6, 0x4e, 0x55, 0x40, 0xd8,
0x0a, 0x37, 0x99, 0x06, 0x92, 0x2a, 0x78, 0xc4, 0xb1, 0xef, 0x86, 0x06, 0xd0, 0x15, 0x9f, 0x4d
}, // SHA256("Noise_IKhfselg2_25519+MLKEM512_ChaChaPoly_SHA256")
std::array<uint8_t, 32>
{
0x95, 0x8d, 0xf6, 0x6c, 0x95, 0xce, 0xa9, 0xf7, 0x42, 0xfc, 0xfa, 0x62, 0x71, 0x36, 0x1e, 0xa7,
0xdc, 0x7a, 0xc0, 0x75, 0x01, 0xcf, 0xf9, 0xfc, 0x9f, 0xdb, 0x4c, 0x68, 0x3a, 0x53, 0x49, 0xeb
} // SHA256 (first)
),
std::make_pair
(
std::array<uint8_t, 32>
{
0x36, 0x03, 0x90, 0x2d, 0xf9, 0xa2, 0x2a, 0x5e, 0xc9, 0x3d, 0xdb, 0x8f, 0xa8, 0x1b, 0xdb, 0x4b,
0xae, 0x9d, 0x93, 0x9c, 0xdf, 0xaf, 0xde, 0x55, 0x49, 0x13, 0xfe, 0x98, 0xf8, 0x4a, 0xd4, 0xbd
}, // SHA256("Noise_IKhfselg2_25519+MLKEM768_ChaChaPoly_SHA256")
std::array<uint8_t, 32>
{
0x15, 0x44, 0x89, 0xbf, 0x30, 0xf0, 0xc9, 0x77, 0x66, 0x10, 0xcb, 0xb1, 0x57, 0x3f, 0xab, 0x68,
0x79, 0x57, 0x39, 0x57, 0x0a, 0xe7, 0xc0, 0x31, 0x8a, 0xa2, 0x96, 0xef, 0xbf, 0xa9, 0x6a, 0xbb
} // SHA256 (first)
),
std::make_pair
(
std::array<uint8_t, 32>
{
0x86, 0xa5, 0x36, 0x44, 0xc6, 0x12, 0xd5, 0x71, 0xa1, 0x2d, 0xd8, 0xb6, 0x0a, 0x00, 0x9f, 0x2c,
0x1a, 0xa8, 0x7d, 0x22, 0xa4, 0xff, 0x2b, 0xcd, 0x61, 0x34, 0x97, 0x6d, 0xa1, 0x49, 0xeb, 0x4a
}, // SHA256("Noise_IKhfselg2_25519+MLKEM1024_ChaChaPoly_SHA256")
std::array<uint8_t, 32>
{
0x42, 0x0d, 0xc2, 0x1c, 0x7b, 0x18, 0x61, 0xb7, 0x4a, 0x04, 0x3d, 0xae, 0x0f, 0xdc, 0xf2, 0x71,
0xb9, 0xba, 0x19, 0xbb, 0xbd, 0x5f, 0xd4, 0x9c, 0x3f, 0x4b, 0x01, 0xed, 0x6d, 0x13, 0x1d, 0xa2
} // SHA256 (first)
)
};
void InitNoiseIKStateMLKEM (NoiseSymmetricState& state, i2p::data::CryptoKeyType type, const uint8_t * pub)
{
if (type <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ||
type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD > (int)NoiseIKInitMLKEMKeys.size ()) return;
auto ind = type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD - 1;
state.Init (NoiseIKInitMLKEMKeys[ind].first.data(), NoiseIKInitMLKEMKeys[ind].second.data(), pub);
}
static constexpr std::array NoiseXKInitMLKEMKeys =
{
std::make_pair
(
std::array<uint8_t, 32>
{
0xf9, 0x9f, 0x6c, 0x60, 0xea, 0x06, 0x78, 0x7f, 0x8d, 0xc2, 0x3f, 0xa3, 0xe9, 0xf7, 0xc0, 0xa5,
0x34, 0x77, 0x10, 0xc1, 0x1d, 0x99, 0xe0, 0xe9, 0x9c, 0xe3, 0x90, 0x2b, 0x92, 0x32, 0x07, 0x20
}, // SHA256("Noise_XKhfsaesobfse+hs2+hs3_25519+MLKEM512_ChaChaPoly_SHA256")
std::array<uint8_t, 32>
{
0x6a, 0xc4, 0x2c, 0xd8, 0x31, 0xeb, 0xd3, 0x0c, 0xdf, 0x90, 0x2e, 0x67, 0xf4, 0x66, 0x39, 0xab,
0x85, 0xcf, 0xac, 0x0f, 0x77, 0xba, 0x79, 0x58, 0x61, 0xe9, 0x56, 0x97, 0x44, 0x99, 0xad, 0xe1
} // SHA256 (first)
),
std::make_pair
(
std::array<uint8_t, 32>
{
0xb9, 0xc3, 0x44, 0x56, 0x11, 0xcc, 0x80, 0xec, 0xca, 0x15, 0xde, 0x37, 0xa4, 0x1a, 0xb6, 0xc6,
0xfb, 0x59, 0xdb, 0x83, 0xeb, 0x1e, 0x9d, 0x7e, 0x27, 0x63, 0xa8, 0xa5, 0x34, 0xec, 0x53, 0xd1
}, // SHA256("Noise_XKhfsaesobfse+hs2+hs3_25519+MLKEM768_ChaChaPoly_SHA256")
std::array<uint8_t, 32>
{
0x0b, 0xcd, 0x38, 0xaf, 0xcf, 0xb7, 0xaa, 0xeb, 0x25, 0x73, 0xb8, 0x4f, 0x74, 0x83, 0x02, 0x94,
0x8b, 0x53, 0xf5, 0x42, 0xce, 0x3f, 0x23, 0xdc, 0xcc, 0x9a, 0xe9, 0xb0, 0x21, 0xab, 0x48, 0xff
} // SHA256 (first)
),
std::make_pair
(
std::array<uint8_t, 32>
{
0x97, 0xe6, 0x8d, 0x27, 0x49, 0x41, 0x50, 0xea, 0x80, 0x54, 0x8e, 0x73, 0x04, 0x45, 0x3f, 0x61,
0x29, 0xbc, 0x07, 0x8b, 0x14, 0x05, 0x13, 0xbe, 0x9a, 0x55, 0xb2, 0x07, 0xa2, 0xda, 0x37, 0x0c
}, // SHA256("Noise_XKhfsaesobfse+hs2+hs3_25519+MLKEM1024_ChaChaPoly_SHA256")
std::array<uint8_t, 32>
{
0x59, 0x50, 0x1a, 0x59, 0x87, 0x82, 0x65, 0x55, 0x58, 0x09, 0x9b, 0xec, 0xab, 0x2a, 0x64, 0x1d,
0xf1, 0x7b, 0xca, 0xe7, 0xb3, 0x5d, 0x6d, 0xa7, 0x8c, 0x6e, 0x79, 0x7e, 0xab, 0xf3, 0x57, 0x3f
} // SHA256 (first)
)
};
void InitNoiseXKStateMLKEM (NoiseSymmetricState& state, i2p::data::CryptoKeyType type, const uint8_t * pub)
{
if (type <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ||
type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD > (int)NoiseXKInitMLKEMKeys.size ()) return;
auto ind = type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD - 1;
state.Init (NoiseXKInitMLKEMKeys[ind].first.data(), NoiseXKInitMLKEMKeys[ind].second.data(), pub);
}
static constexpr std::array NoiseXKInitMLKEMKeys1 =
{
std::make_pair
(
std::array<uint8_t, 32>
{
0x16, 0x22, 0x45, 0x4d, 0xbe, 0xa3, 0xf7, 0x7b, 0xcf, 0x5a, 0x0b, 0x60, 0xf8, 0x56, 0xe0, 0x54,
0xa6, 0x79, 0x72, 0x74, 0x2a, 0xb7, 0x1a, 0xdf, 0x39, 0x38, 0x7d, 0x35, 0xf8, 0x90, 0x41, 0x68
}, // SHA256("Noise_XKhfschaobfse+hs1+hs2+hs3_25519+MLKEM512_ChaChaPoly_SHA256")
std::array<uint8_t, 32>
{
0xb1, 0x84, 0xaf, 0x89, 0xb5, 0xd2, 0x7f, 0xbd, 0xa4, 0x62, 0xbe, 0x35, 0xa4, 0xc0, 0x17, 0x77,
0xfb, 0x70, 0xc7, 0x39, 0x28, 0x72, 0xcf, 0x74, 0x4a, 0xbf, 0x3c, 0xc5, 0xb8, 0x6c, 0xaf, 0xcf
} // SHA256 (first)
),
std::make_pair
(
std::array<uint8_t, 32>
{
0x06, 0x45, 0x8d, 0x7f, 0x4a, 0x0e, 0x53, 0xd3, 0x7b, 0xdb, 0xbb, 0x74, 0x77, 0x99, 0xa1, 0x04,
0xc7, 0x52, 0x00, 0x0b, 0xe0, 0xd1, 0x2a, 0x83, 0x03, 0x7b, 0xe3, 0xd1, 0xdb, 0x77, 0xf2, 0x90
}, // SHA256("Noise_XKhfschaobfse+hs1+hs2+hs3_25519+MLKEM768_ChaChaPoly_SHA256")
std::array<uint8_t, 32>
{
0xd6, 0xae, 0x20, 0x15, 0x44, 0x5f, 0x61, 0xa5, 0xa7, 0xe2, 0x87, 0xcf, 0x64, 0xe0, 0x0c, 0xcc,
0x97, 0xeb, 0xea, 0x1c, 0x5d, 0xd0, 0x8c, 0x26, 0x34, 0x32, 0x06, 0xf5, 0x5e, 0x28, 0xad, 0x12
} // SHA256 (first)
)
// no ML-KEM-1024
};
void InitNoiseXKStateMLKEM1 (NoiseSymmetricState& state, i2p::data::CryptoKeyType type, const uint8_t * pub)
{
if (type <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ||
type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD > (int)NoiseXKInitMLKEMKeys1.size ()) return;
auto ind = type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD - 1;
state.Init (NoiseXKInitMLKEMKeys1[ind].first.data(), NoiseXKInitMLKEMKeys1[ind].second.data(), pub);
}
}
}
#else
# warning You are compile without PostQuant encryption support
#endif
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