PurpleI2P
/
i2pd
mirror of https://github.com/PurpleI2P/i2pd.git
1
0
Fork 0
Code Issues Releases Activity
Browse Source

complete implementation of RedDSA

pull/1334/head
orignal 6 years ago
parent
c797ac4268
commit
ff44bcc489
4 changed files with 100 additions and 7 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 54
      libi2pd/Ed25519.cpp
  2. 6
      libi2pd/Ed25519.h
  3. 11
      libi2pd/Identity.cpp
  4. 36
      libi2pd/Signature.h

54
libi2pd/Ed25519.cpp
Unescape View File

@ -121,8 +121,8 @@ namespace crypto @@ -121,8 +121,8 @@ namespace crypto
return passed;
}
void Ed25519::Sign (const uint8_t * expandedPrivateKey, const uint8_t * publicKeyEncoded, const uint8_t * buf, size_t len,
uint8_t * signature) const
void Ed25519::Sign (const uint8_t * expandedPrivateKey, const uint8_t * publicKeyEncoded,
const uint8_t * buf, size_t len, uint8_t * signature) const
{
BN_CTX * bnCtx = BN_CTX_new ();
// calculate r
@ -153,6 +153,44 @@ namespace crypto @@ -153,6 +153,44 @@ namespace crypto
BN_CTX_free (bnCtx);
}
void Ed25519::SignRedDSA (const uint8_t * privateKey, const uint8_t * publicKeyEncoded,
const uint8_t * buf, size_t len, uint8_t * signature) const
{
BN_CTX * bnCtx = BN_CTX_new ();
// T = 80 random bytes
uint8_t T[80];
RAND_bytes (T, 80);
// calculate r = H*(T || publickey || data)
SHA512_CTX ctx;
SHA512_Init (&ctx);
SHA512_Update (&ctx, T, 80);
SHA512_Update (&ctx, publicKeyEncoded, 32);
SHA512_Update (&ctx, buf, len); // data
uint8_t digest[64];
SHA512_Final (digest, &ctx);
BIGNUM * r = DecodeBN<64> (digest);
BN_mod (r, r, l, bnCtx); // % l
EncodeBN (r, digest, 32);
// calculate R
uint8_t R[EDDSA25519_SIGNATURE_LENGTH/2]; // we must use separate buffer because signature might be inside buf
EncodePoint (Normalize (MulB (digest, bnCtx), bnCtx), R);
// calculate S
SHA512_Init (&ctx);
SHA512_Update (&ctx, R, EDDSA25519_SIGNATURE_LENGTH/2); // R
SHA512_Update (&ctx, publicKeyEncoded, EDDSA25519_PUBLIC_KEY_LENGTH); // public key
SHA512_Update (&ctx, buf, len); // data
SHA512_Final (digest, &ctx);
BIGNUM * h = DecodeBN<64> (digest);
// S = (r + h*a) % l
BIGNUM * a = DecodeBN<EDDSA25519_PRIVATE_KEY_LENGTH> (privateKey);
BN_mod_mul (h, h, a, l, bnCtx); // %l
BN_mod_add (h, h, r, l, bnCtx); // %l
memcpy (signature, R, EDDSA25519_SIGNATURE_LENGTH/2);
EncodeBN (h, signature + EDDSA25519_SIGNATURE_LENGTH/2, EDDSA25519_SIGNATURE_LENGTH/2); // S
BN_free (r); BN_free (h); BN_free (a);
BN_CTX_free (bnCtx);
}
EDDSAPoint Ed25519::Sum (const EDDSAPoint& p1, const EDDSAPoint& p2, BN_CTX * ctx) const
{
// x3 = (x1*y2+y1*x2)*(z1*z2-d*t1*t2)
@ -514,6 +552,18 @@ namespace crypto @@ -514,6 +552,18 @@ namespace crypto
expandedKey[EDDSA25519_PRIVATE_KEY_LENGTH - 1] |= 0x40; // set second bit
}
void Ed25519::CreateRedDSAPrivateKey (uint8_t * priv)
{
uint8_t seed[32];
RAND_bytes (seed, 32);
BIGNUM * p = DecodeBN<32> (seed);
BN_CTX * ctx = BN_CTX_new ();
BN_mod (p, p, l, ctx); // % l
EncodeBN (p, priv, 32);
BN_CTX_free (ctx);
BN_free (p);
}
static std::unique_ptr<Ed25519> g_Ed25519;
std::unique_ptr<Ed25519>& GetEd25519 ()
{

6
libi2pd/Ed25519.h
Unescape View File

@ -84,9 +84,11 @@ namespace crypto @@ -84,9 +84,11 @@ namespace crypto
bool Verify (const EDDSAPoint& publicKey, const uint8_t * digest, const uint8_t * signature) const;
void Sign (const uint8_t * expandedPrivateKey, const uint8_t * publicKeyEncoded, const uint8_t * buf, size_t len, uint8_t * signature) const;
void SignRedDSA (const uint8_t * privateKey, const uint8_t * publicKeyEncoded, const uint8_t * buf, size_t len, uint8_t * signature) const;
static void ExpandPrivateKey (const uint8_t * key, uint8_t * expandedKey); // key - 32 bytes, expandedKey - 64 bytes
void CreateRedDSAPrivateKey (uint8_t * priv); // priv is 32 bytes
private:
EDDSAPoint Sum (const EDDSAPoint& p1, const EDDSAPoint& p2, BN_CTX * ctx) const;

11
libi2pd/Identity.cpp
Unescape View File

@ -338,12 +338,13 @@ namespace data @@ -338,12 +338,13 @@ namespace data
case SIGNING_KEY_TYPE_ECDSA_SHA512_P521:
return new i2p::crypto::ECDSAP521Verifier ();
case SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519:
case SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
return new i2p::crypto::EDDSA25519Verifier ();
case SIGNING_KEY_TYPE_GOSTR3410_CRYPTO_PRO_A_GOSTR3411_256:
return new i2p::crypto::GOSTR3410_256_Verifier (i2p::crypto::eGOSTR3410CryptoProA);
case SIGNING_KEY_TYPE_GOSTR3410_TC26_A_512_GOSTR3411_512:
return new i2p::crypto::GOSTR3410_512_Verifier (i2p::crypto::eGOSTR3410TC26A512);
case SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
return new i2p::crypto::RedDSA25519Verifier ();
case SIGNING_KEY_TYPE_RSA_SHA256_2048:
case SIGNING_KEY_TYPE_RSA_SHA384_3072:
case SIGNING_KEY_TYPE_RSA_SHA512_4096:
@ -611,7 +612,6 @@ namespace data @@ -611,7 +612,6 @@ namespace data
LogPrint (eLogError, "Identity: RSA signing key type ", (int)m_Public->GetSigningKeyType (), " is not supported");
break;
case SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519:
case SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
m_Signer.reset (new i2p::crypto::EDDSA25519Signer (m_SigningPrivateKey, IsOfflineSignature () ? nullptr: m_Public->GetStandardIdentity ().certificate - i2p::crypto::EDDSA25519_PUBLIC_KEY_LENGTH)); // TODO: remove public key check
break;
case SIGNING_KEY_TYPE_GOSTR3410_CRYPTO_PRO_A_GOSTR3411_256:
@ -620,6 +620,9 @@ namespace data @@ -620,6 +620,9 @@ namespace data
case SIGNING_KEY_TYPE_GOSTR3410_TC26_A_512_GOSTR3411_512:
m_Signer.reset (new i2p::crypto::GOSTR3410_512_Signer (i2p::crypto::eGOSTR3410TC26A512, m_SigningPrivateKey));
break;
case SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
m_Signer.reset (new i2p::crypto::RedDSA25519Signer (m_SigningPrivateKey));
break;
default:
LogPrint (eLogError, "Identity: Signing key type ", (int)m_Public->GetSigningKeyType (), " is not supported");
}
@ -704,7 +707,6 @@ namespace data @@ -704,7 +707,6 @@ namespace data
LogPrint (eLogWarning, "Identity: RSA signature type is not supported. Creating EdDSA");
// no break here
case SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519:
case SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
i2p::crypto::CreateEDDSA25519RandomKeys (priv, pub);
break;
case SIGNING_KEY_TYPE_GOSTR3410_CRYPTO_PRO_A_GOSTR3411_256:
@ -713,6 +715,9 @@ namespace data @@ -713,6 +715,9 @@ namespace data
case SIGNING_KEY_TYPE_GOSTR3410_TC26_A_512_GOSTR3411_512:
i2p::crypto::CreateGOSTR3410RandomKeys (i2p::crypto::eGOSTR3410TC26A512, priv, pub);
break;
case SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
i2p::crypto::CreateRedDSA25519RandomKeys (priv, pub);
break;
default:
LogPrint (eLogWarning, "Identity: Signing key type ", (int)type, " is not supported. Create DSA-SHA1");
i2p::crypto::CreateDSARandomKeys (priv, pub); // DSA-SHA1

36
libi2pd/Signature.h
Unescape View File

@ -487,6 +487,42 @@ namespace crypto @@ -487,6 +487,42 @@ namespace crypto
typedef GOSTR3410Signer<GOSTR3411_256_Hash> GOSTR3410_256_Signer;
typedef GOSTR3410Verifier<GOSTR3411_512_Hash> GOSTR3410_512_Verifier;
typedef GOSTR3410Signer<GOSTR3411_512_Hash> GOSTR3410_512_Signer;
// RedDSA
typedef EDDSA25519Verifier RedDSA25519Verifier;
class RedDSA25519Signer: public Signer
{
public:
RedDSA25519Signer (const uint8_t * signingPrivateKey)
{
memcpy (m_PrivateKey, signingPrivateKey, EDDSA25519_PRIVATE_KEY_LENGTH);
BN_CTX * ctx = BN_CTX_new ();
auto publicKey = GetEd25519 ()->GeneratePublicKey (m_PrivateKey, ctx);
GetEd25519 ()->EncodePublicKey (publicKey, m_PublicKeyEncoded, ctx);
BN_CTX_free (ctx);
}
~RedDSA25519Signer () {};
void Sign (const uint8_t * buf, int len, uint8_t * signature) const
{
GetEd25519 ()->SignRedDSA (m_PrivateKey, m_PublicKeyEncoded, buf, len, signature);
}
const uint8_t * GetPublicKey () const { return m_PublicKeyEncoded; }; // for keys creation
private:
uint8_t m_PrivateKey[EDDSA25519_PRIVATE_KEY_LENGTH];
uint8_t m_PublicKeyEncoded[EDDSA25519_PUBLIC_KEY_LENGTH];
};
inline void CreateRedDSA25519RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
GetEd25519 ()->CreateRedDSAPrivateKey (signingPrivateKey);
RedDSA25519Signer signer (signingPrivateKey);
memcpy (signingPublicKey, signer.GetPublicKey (), EDDSA25519_PUBLIC_KEY_LENGTH);
}
}
}

Write Preview
Loading…
Cancel
Save