I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef SIGNATURE_H__
#define SIGNATURE_H__
#include <inttypes.h>
#include <string.h>
#include "Crypto.h"
#include OPENSSL(sha.h)
#include OPENSSL(dsa.h)
#include OPENSSL(ec.h)
#include OPENSSL(ecdsa.h)
#include OPENSSL(rsa.h)
#include OPENSSL(rand.h)
#include OPENSSL(evp.h)
namespace i2p
{
namespace crypto
{
class Verifier
{
public:
virtual ~Verifier () {};
virtual bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const = 0;
virtual size_t GetPublicKeyLen () const = 0;
virtual size_t GetSignatureLen () const = 0;
virtual size_t GetPrivateKeyLen () const { return GetSignatureLen ()/2; };
};
class Signer
{
public:
virtual ~Signer () {};
virtual void Sign (const uint8_t * buf, int len, uint8_t * signature) const = 0;
};
const size_t DSA_PUBLIC_KEY_LENGTH = 128;
const size_t DSA_SIGNATURE_LENGTH = 40;
const size_t DSA_PRIVATE_KEY_LENGTH = DSA_SIGNATURE_LENGTH/2;
class DSAVerifier: public Verifier
{
public:
DSAVerifier (const uint8_t * signingKey)
{
m_PublicKey = CreateDSA ();
m_PublicKey->pub_key = BN_bin2bn (signingKey, DSA_PUBLIC_KEY_LENGTH, NULL);
}
~DSAVerifier ()
{
DSA_free (m_PublicKey);
}
bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
// calculate SHA1 digest
uint8_t digest[20];
SHA1 (buf, len, digest);
// signature
DSA_SIG * sig = DSA_SIG_new();
sig->r = BN_bin2bn (signature, DSA_SIGNATURE_LENGTH/2, NULL);
sig->s = BN_bin2bn (signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2, NULL);
// DSA verification
int ret = DSA_do_verify (digest, 20, sig, m_PublicKey);
DSA_SIG_free(sig);
return ret;
}
size_t GetPublicKeyLen () const { return DSA_PUBLIC_KEY_LENGTH; };
size_t GetSignatureLen () const { return DSA_SIGNATURE_LENGTH; };
private:
DSA * m_PublicKey;
};
class DSASigner: public Signer
{
public:
DSASigner (const uint8_t * signingPrivateKey)
{
m_PrivateKey = CreateDSA ();
m_PrivateKey->priv_key = BN_bin2bn (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH, NULL);
}
~DSASigner ()
{
DSA_free (m_PrivateKey);
}
void Sign (const uint8_t * buf, int len, uint8_t * signature) const
{
uint8_t digest[20];
SHA1 (buf, len, digest);
DSA_SIG * sig = DSA_do_sign (digest, 20, m_PrivateKey);
bn2buf (sig->r, signature, DSA_SIGNATURE_LENGTH/2);
bn2buf (sig->s, signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2);
DSA_SIG_free(sig);
}
private:
DSA * m_PrivateKey;
};
inline void CreateDSARandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
DSA * dsa = CreateDSA ();
DSA_generate_key (dsa);
bn2buf (dsa->priv_key, signingPrivateKey, DSA_PRIVATE_KEY_LENGTH);
bn2buf (dsa->pub_key, signingPublicKey, DSA_PUBLIC_KEY_LENGTH);
DSA_free (dsa);
}
struct SHA256Hash
{
static void CalculateHash (const uint8_t * buf, size_t len, uint8_t * digest)
{
SHA256 (buf, len, digest);
}
enum { hashLen = 32 };
};
struct SHA384Hash
{
static void CalculateHash (const uint8_t * buf, size_t len, uint8_t * digest)
{
SHA384 (buf, len, digest);
}
enum { hashLen = 48 };
};
struct SHA512Hash
{
static void CalculateHash (const uint8_t * buf, size_t len, uint8_t * digest)
{
SHA512 (buf, len, digest);
}
enum { hashLen = 64 };
};
template<typename Hash, int curve, size_t keyLen>
class ECDSAVerifier: public Verifier
{
public:
ECDSAVerifier (const uint8_t * signingKey)
{
m_PublicKey = EC_KEY_new_by_curve_name (curve);
EC_KEY_set_public_key_affine_coordinates (m_PublicKey,
BN_bin2bn (signingKey, keyLen/2, NULL),
BN_bin2bn (signingKey + keyLen/2, keyLen/2, NULL));
}
~ECDSAVerifier ()
{
EC_KEY_free (m_PublicKey);
}
bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
uint8_t digest[Hash::hashLen];
Hash::CalculateHash (buf, len, digest);
ECDSA_SIG * sig = ECDSA_SIG_new();
sig->r = BN_bin2bn (signature, GetSignatureLen ()/2, NULL);
sig->s = BN_bin2bn (signature + GetSignatureLen ()/2, GetSignatureLen ()/2, NULL);
// ECDSA verification
int ret = ECDSA_do_verify (digest, Hash::hashLen, sig, m_PublicKey);
ECDSA_SIG_free(sig);
return ret;
}
size_t GetPublicKeyLen () const { return keyLen; };
size_t GetSignatureLen () const { return keyLen; }; // signature length = key length
private:
EC_KEY * m_PublicKey;
};
template<typename Hash, int curve, size_t keyLen>
class ECDSASigner: public Signer
{
public:
ECDSASigner (const uint8_t * signingPrivateKey)
{
m_PrivateKey = EC_KEY_new_by_curve_name (curve);
EC_KEY_set_private_key (m_PrivateKey, BN_bin2bn (signingPrivateKey, keyLen/2, NULL));
}
~ECDSASigner ()
{
EC_KEY_free (m_PrivateKey);
}
void Sign (const uint8_t * buf, int len, uint8_t * signature) const
{
uint8_t digest[Hash::hashLen];
Hash::CalculateHash (buf, len, digest);
ECDSA_SIG * sig = ECDSA_do_sign (digest, Hash::hashLen, m_PrivateKey);
// signatureLen = keyLen
bn2buf (sig->r, signature, keyLen/2);
bn2buf (sig->s, signature + keyLen/2, keyLen/2);
ECDSA_SIG_free(sig);
}
private:
EC_KEY * m_PrivateKey;
};
inline void CreateECDSARandomKeys (int curve, size_t keyLen, uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
EC_KEY * signingKey = EC_KEY_new_by_curve_name (curve);
EC_KEY_generate_key (signingKey);
bn2buf (EC_KEY_get0_private_key (signingKey), signingPrivateKey, keyLen/2);
BIGNUM * x = BN_new(), * y = BN_new();
EC_POINT_get_affine_coordinates_GFp (EC_KEY_get0_group(signingKey),
EC_KEY_get0_public_key (signingKey), x, y, NULL);
bn2buf (x, signingPublicKey, keyLen/2);
bn2buf (y, signingPublicKey + keyLen/2, keyLen/2);
BN_free (x); BN_free (y);
EC_KEY_free (signingKey);
}
// ECDSA_SHA256_P256
const size_t ECDSAP256_KEY_LENGTH = 64;
typedef ECDSAVerifier<SHA256Hash, NID_X9_62_prime256v1, ECDSAP256_KEY_LENGTH> ECDSAP256Verifier;
typedef ECDSASigner<SHA256Hash, NID_X9_62_prime256v1, ECDSAP256_KEY_LENGTH> ECDSAP256Signer;
inline void CreateECDSAP256RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
CreateECDSARandomKeys (NID_X9_62_prime256v1, ECDSAP256_KEY_LENGTH, signingPrivateKey, signingPublicKey);
}
// ECDSA_SHA384_P384
const size_t ECDSAP384_KEY_LENGTH = 96;
typedef ECDSAVerifier<SHA384Hash, NID_secp384r1, ECDSAP384_KEY_LENGTH> ECDSAP384Verifier;
typedef ECDSASigner<SHA384Hash, NID_secp384r1, ECDSAP384_KEY_LENGTH> ECDSAP384Signer;
inline void CreateECDSAP384RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
CreateECDSARandomKeys (NID_secp384r1, ECDSAP384_KEY_LENGTH, signingPrivateKey, signingPublicKey);
}
// ECDSA_SHA512_P521
const size_t ECDSAP521_KEY_LENGTH = 132;
typedef ECDSAVerifier<SHA512Hash, NID_secp521r1, ECDSAP521_KEY_LENGTH> ECDSAP521Verifier;
typedef ECDSASigner<SHA512Hash, NID_secp521r1, ECDSAP521_KEY_LENGTH> ECDSAP521Signer;
inline void CreateECDSAP521RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
CreateECDSARandomKeys (NID_secp521r1, ECDSAP521_KEY_LENGTH, signingPrivateKey, signingPublicKey);
}
// RSA
template<typename Hash, int type, size_t keyLen>
class RSAVerifier: public Verifier
{
public:
RSAVerifier (const uint8_t * signingKey)
{
m_PublicKey = RSA_new ();
memset (m_PublicKey, 0, sizeof (RSA));
m_PublicKey->e = BN_dup (GetRSAE ());
m_PublicKey->n = BN_bin2bn (signingKey, keyLen, NULL);
}
~RSAVerifier ()
{
RSA_free (m_PublicKey);
}
bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
uint8_t digest[Hash::hashLen];
Hash::CalculateHash (buf, len, digest);
return RSA_verify (type, digest, Hash::hashLen, signature, GetSignatureLen (), m_PublicKey);
}
size_t GetPublicKeyLen () const { return keyLen; }
size_t GetSignatureLen () const { return keyLen; }
size_t GetPrivateKeyLen () const { return GetSignatureLen ()*2; };
private:
RSA * m_PublicKey;
};
template<typename Hash, int type, size_t keyLen>
class RSASigner: public Signer
{
public:
RSASigner (const uint8_t * signingPrivateKey)
{
m_PrivateKey = RSA_new ();
memset (m_PrivateKey, 0, sizeof (RSA));
m_PrivateKey->e = BN_dup (GetRSAE ());
m_PrivateKey->n = BN_bin2bn (signingPrivateKey, keyLen, NULL);
m_PrivateKey->d = BN_bin2bn (signingPrivateKey + keyLen, keyLen, NULL);
}
~RSASigner ()
{
RSA_free (m_PrivateKey);
}
void Sign (const uint8_t * buf, int len, uint8_t * signature) const
{
uint8_t digest[Hash::hashLen];
Hash::CalculateHash (buf, len, digest);
unsigned int signatureLen = keyLen;
RSA_sign (type, digest, Hash::hashLen, signature, &signatureLen, m_PrivateKey);
}
private:
RSA * m_PrivateKey;
};
inline void CreateRSARandomKeys (size_t publicKeyLen, uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
RSA * rsa = RSA_new ();
BIGNUM * e = BN_dup (GetRSAE ()); // make it non-const
RSA_generate_key_ex (rsa, publicKeyLen*8, e, NULL);
bn2buf (rsa->n, signingPrivateKey, publicKeyLen);
bn2buf (rsa->d, signingPrivateKey + publicKeyLen, publicKeyLen);
bn2buf (rsa->n, signingPublicKey, publicKeyLen);
BN_free (e); // this e is not assigned to rsa->e
RSA_free (rsa);
}
// RSA_SHA256_2048
const size_t RSASHA2562048_KEY_LENGTH = 256;
typedef RSAVerifier<SHA256Hash, NID_sha256, RSASHA2562048_KEY_LENGTH> RSASHA2562048Verifier;
typedef RSASigner<SHA256Hash, NID_sha256, RSASHA2562048_KEY_LENGTH> RSASHA2562048Signer;
// RSA_SHA384_3072
const size_t RSASHA3843072_KEY_LENGTH = 384;
typedef RSAVerifier<SHA384Hash, NID_sha384, RSASHA3843072_KEY_LENGTH> RSASHA3843072Verifier;
typedef RSASigner<SHA384Hash, NID_sha384, RSASHA3843072_KEY_LENGTH> RSASHA3843072Signer;
// RSA_SHA512_4096
const size_t RSASHA5124096_KEY_LENGTH = 512;
typedef RSAVerifier<SHA512Hash, NID_sha512, RSASHA5124096_KEY_LENGTH> RSASHA5124096Verifier;
typedef RSASigner<SHA512Hash, NID_sha512, RSASHA5124096_KEY_LENGTH> RSASHA5124096Signer;
// EdDSA
struct EDDSAPoint
{
BIGNUM * x, * y;
BIGNUM * z, * t; // projective coordinates
EDDSAPoint (): x(nullptr), y(nullptr), z(nullptr), t(nullptr) {};
EDDSAPoint (const EDDSAPoint& other): x(nullptr), y(nullptr), z(nullptr), t(nullptr)
{ *this = other; };
EDDSAPoint (EDDSAPoint&& other): x(nullptr), y(nullptr), z(nullptr), t(nullptr)
{ *this = std::move (other); };
EDDSAPoint (BIGNUM * x1, BIGNUM * y1, BIGNUM * z1 = nullptr, BIGNUM * t1 = nullptr): x(x1), y(y1), z(z1), t(t1) {};
~EDDSAPoint () { BN_free (x); BN_free (y); BN_free(z); BN_free(t); };
EDDSAPoint& operator=(EDDSAPoint&& other)
{
if (x) BN_free (x); x = other.x; other.x = nullptr;
if (y) BN_free (y); y = other.y; other.y = nullptr;
if (z) BN_free (z); z = other.z; other.z = nullptr;
if (t) BN_free (t); t = other.t; other.t = nullptr;
return *this;
}
EDDSAPoint& operator=(const EDDSAPoint& other)
{
if (x) BN_free (x); x = other.x ? BN_dup (other.x) : nullptr;
if (y) BN_free (y); y = other.y ? BN_dup (other.y) : nullptr;
if (z) BN_free (z); z = other.z ? BN_dup (other.z) : nullptr;
if (t) BN_free (t); t = other.t ? BN_dup (other.t) : nullptr;
return *this;
}
EDDSAPoint operator-() const
{
BIGNUM * x1 = NULL, * y1 = NULL, * z1 = NULL, * t1 = NULL;
if (x) { x1 = BN_dup (x); BN_set_negative (x1, !BN_is_negative (x)); };
if (y) y1 = BN_dup (y);
if (z) z1 = BN_dup (z);
if (t) { t1 = BN_dup (t); BN_set_negative (t1, !BN_is_negative (t)); };
return EDDSAPoint {x1, y1, z1, t1};
}
};
const size_t EDDSA25519_PUBLIC_KEY_LENGTH = 32;
const size_t EDDSA25519_SIGNATURE_LENGTH = 64;
const size_t EDDSA25519_PRIVATE_KEY_LENGTH = 32;
class EDDSA25519Verifier: public Verifier
{
public:
EDDSA25519Verifier (const uint8_t * signingKey);
bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const;
size_t GetPublicKeyLen () const { return EDDSA25519_PUBLIC_KEY_LENGTH; };
size_t GetSignatureLen () const { return EDDSA25519_SIGNATURE_LENGTH; };
private:
EDDSAPoint m_PublicKey;
uint8_t m_PublicKeyEncoded[EDDSA25519_PUBLIC_KEY_LENGTH];
};
class EDDSA25519Signer: public Signer
{
public:
EDDSA25519Signer (const uint8_t * signingPrivateKey);
void Sign (const uint8_t * buf, int len, uint8_t * signature) const;
const uint8_t * GetPublicKey () const { return m_PublicKeyEncoded; };
private:
uint8_t m_ExpandedPrivateKey[64];
uint8_t m_PublicKeyEncoded[EDDSA25519_PUBLIC_KEY_LENGTH];
};
inline void CreateEDDSA25519RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
{
RAND_bytes (signingPrivateKey, EDDSA25519_PRIVATE_KEY_LENGTH);
EDDSA25519Signer signer (signingPrivateKey);
memcpy (signingPublicKey, signer.GetPublicKey (), EDDSA25519_PUBLIC_KEY_LENGTH);
}
}
}
#endif