mirror of
https://github.com/PurpleI2P/i2pd.git
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537 lines
15 KiB
C++
537 lines
15 KiB
C++
/*
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* Copyright (c) 2013-2021, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#ifndef SIGNATURE_H__
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#define SIGNATURE_H__
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#include <inttypes.h>
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#include <string.h>
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#include <openssl/dsa.h>
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#include <openssl/ec.h>
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#include <openssl/ecdsa.h>
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#include <openssl/evp.h>
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#include "Crypto.h"
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#include "Ed25519.h"
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#include "Gost.h"
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namespace i2p
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{
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namespace crypto
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{
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class Verifier
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{
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public:
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virtual ~Verifier () {};
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virtual bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const = 0;
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virtual size_t GetPublicKeyLen () const = 0;
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virtual size_t GetSignatureLen () const = 0;
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virtual size_t GetPrivateKeyLen () const { return GetSignatureLen ()/2; };
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virtual void SetPublicKey (const uint8_t * signingKey) = 0;
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};
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class Signer
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{
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public:
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virtual ~Signer () {};
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virtual void Sign (const uint8_t * buf, int len, uint8_t * signature) const = 0;
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};
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const size_t DSA_PUBLIC_KEY_LENGTH = 128;
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const size_t DSA_SIGNATURE_LENGTH = 40;
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const size_t DSA_PRIVATE_KEY_LENGTH = DSA_SIGNATURE_LENGTH/2;
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class DSAVerifier: public Verifier
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{
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public:
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DSAVerifier ()
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{
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m_PublicKey = CreateDSA ();
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}
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void SetPublicKey (const uint8_t * signingKey)
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{
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DSA_set0_key (m_PublicKey, BN_bin2bn (signingKey, DSA_PUBLIC_KEY_LENGTH, NULL), NULL);
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}
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~DSAVerifier ()
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{
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DSA_free (m_PublicKey);
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}
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bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
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{
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// calculate SHA1 digest
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uint8_t digest[20];
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SHA1 (buf, len, digest);
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// signature
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DSA_SIG * sig = DSA_SIG_new();
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DSA_SIG_set0 (sig, BN_bin2bn (signature, DSA_SIGNATURE_LENGTH/2, NULL), BN_bin2bn (signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2, NULL));
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// DSA verification
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int ret = DSA_do_verify (digest, 20, sig, m_PublicKey);
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DSA_SIG_free(sig);
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return ret;
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}
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size_t GetPublicKeyLen () const { return DSA_PUBLIC_KEY_LENGTH; };
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size_t GetSignatureLen () const { return DSA_SIGNATURE_LENGTH; };
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private:
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DSA * m_PublicKey;
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};
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class DSASigner: public Signer
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{
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public:
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DSASigner (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey)
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// openssl 1.1 always requires DSA public key even for signing
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{
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m_PrivateKey = CreateDSA ();
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DSA_set0_key (m_PrivateKey, BN_bin2bn (signingPublicKey, DSA_PUBLIC_KEY_LENGTH, NULL), BN_bin2bn (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH, NULL));
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}
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~DSASigner ()
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{
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DSA_free (m_PrivateKey);
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}
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void Sign (const uint8_t * buf, int len, uint8_t * signature) const
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{
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uint8_t digest[20];
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SHA1 (buf, len, digest);
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DSA_SIG * sig = DSA_do_sign (digest, 20, m_PrivateKey);
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const BIGNUM * r, * s;
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DSA_SIG_get0 (sig, &r, &s);
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bn2buf (r, signature, DSA_SIGNATURE_LENGTH/2);
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bn2buf (s, signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2);
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DSA_SIG_free(sig);
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}
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private:
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DSA * m_PrivateKey;
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};
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inline void CreateDSARandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
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{
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DSA * dsa = CreateDSA ();
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DSA_generate_key (dsa);
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const BIGNUM * pub_key, * priv_key;
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DSA_get0_key(dsa, &pub_key, &priv_key);
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bn2buf (priv_key, signingPrivateKey, DSA_PRIVATE_KEY_LENGTH);
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bn2buf (pub_key, signingPublicKey, DSA_PUBLIC_KEY_LENGTH);
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DSA_free (dsa);
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}
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struct SHA256Hash
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{
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static void CalculateHash (const uint8_t * buf, size_t len, uint8_t * digest)
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{
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SHA256 (buf, len, digest);
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}
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enum { hashLen = 32 };
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};
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struct SHA384Hash
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{
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static void CalculateHash (const uint8_t * buf, size_t len, uint8_t * digest)
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{
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SHA384 (buf, len, digest);
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}
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enum { hashLen = 48 };
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};
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struct SHA512Hash
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{
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static void CalculateHash (const uint8_t * buf, size_t len, uint8_t * digest)
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{
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SHA512 (buf, len, digest);
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}
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enum { hashLen = 64 };
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};
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// EcDSA
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template<typename Hash, int curve, size_t keyLen>
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class ECDSAVerifier: public Verifier
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{
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public:
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ECDSAVerifier ()
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{
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m_PublicKey = EC_KEY_new_by_curve_name (curve);
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}
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void SetPublicKey (const uint8_t * signingKey)
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{
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BIGNUM * x = BN_bin2bn (signingKey, keyLen/2, NULL);
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BIGNUM * y = BN_bin2bn (signingKey + keyLen/2, keyLen/2, NULL);
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EC_KEY_set_public_key_affine_coordinates (m_PublicKey, x, y);
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BN_free (x); BN_free (y);
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}
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~ECDSAVerifier ()
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{
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EC_KEY_free (m_PublicKey);
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}
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bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
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{
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uint8_t digest[Hash::hashLen];
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Hash::CalculateHash (buf, len, digest);
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ECDSA_SIG * sig = ECDSA_SIG_new();
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auto r = BN_bin2bn (signature, GetSignatureLen ()/2, NULL);
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auto s = BN_bin2bn (signature + GetSignatureLen ()/2, GetSignatureLen ()/2, NULL);
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ECDSA_SIG_set0(sig, r, s);
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// ECDSA verification
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int ret = ECDSA_do_verify (digest, Hash::hashLen, sig, m_PublicKey);
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ECDSA_SIG_free(sig);
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return ret;
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}
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size_t GetPublicKeyLen () const { return keyLen; };
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size_t GetSignatureLen () const { return keyLen; }; // signature length = key length
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private:
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EC_KEY * m_PublicKey;
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};
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template<typename Hash, int curve, size_t keyLen>
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class ECDSASigner: public Signer
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{
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public:
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ECDSASigner (const uint8_t * signingPrivateKey)
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{
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m_PrivateKey = EC_KEY_new_by_curve_name (curve);
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EC_KEY_set_private_key (m_PrivateKey, BN_bin2bn (signingPrivateKey, keyLen/2, NULL));
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}
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~ECDSASigner ()
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{
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EC_KEY_free (m_PrivateKey);
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}
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void Sign (const uint8_t * buf, int len, uint8_t * signature) const
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{
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uint8_t digest[Hash::hashLen];
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Hash::CalculateHash (buf, len, digest);
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ECDSA_SIG * sig = ECDSA_do_sign (digest, Hash::hashLen, m_PrivateKey);
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const BIGNUM * r, * s;
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ECDSA_SIG_get0 (sig, &r, &s);
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// signatureLen = keyLen
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bn2buf (r, signature, keyLen/2);
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bn2buf (s, signature + keyLen/2, keyLen/2);
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ECDSA_SIG_free(sig);
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}
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private:
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EC_KEY * m_PrivateKey;
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};
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inline void CreateECDSARandomKeys (int curve, size_t keyLen, uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
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{
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EC_KEY * signingKey = EC_KEY_new_by_curve_name (curve);
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EC_KEY_generate_key (signingKey);
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bn2buf (EC_KEY_get0_private_key (signingKey), signingPrivateKey, keyLen/2);
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BIGNUM * x = BN_new(), * y = BN_new();
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EC_POINT_get_affine_coordinates_GFp (EC_KEY_get0_group(signingKey),
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EC_KEY_get0_public_key (signingKey), x, y, NULL);
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bn2buf (x, signingPublicKey, keyLen/2);
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bn2buf (y, signingPublicKey + keyLen/2, keyLen/2);
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BN_free (x); BN_free (y);
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EC_KEY_free (signingKey);
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}
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// ECDSA_SHA256_P256
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const size_t ECDSAP256_KEY_LENGTH = 64;
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typedef ECDSAVerifier<SHA256Hash, NID_X9_62_prime256v1, ECDSAP256_KEY_LENGTH> ECDSAP256Verifier;
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typedef ECDSASigner<SHA256Hash, NID_X9_62_prime256v1, ECDSAP256_KEY_LENGTH> ECDSAP256Signer;
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inline void CreateECDSAP256RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
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{
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CreateECDSARandomKeys (NID_X9_62_prime256v1, ECDSAP256_KEY_LENGTH, signingPrivateKey, signingPublicKey);
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}
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// ECDSA_SHA384_P384
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const size_t ECDSAP384_KEY_LENGTH = 96;
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typedef ECDSAVerifier<SHA384Hash, NID_secp384r1, ECDSAP384_KEY_LENGTH> ECDSAP384Verifier;
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typedef ECDSASigner<SHA384Hash, NID_secp384r1, ECDSAP384_KEY_LENGTH> ECDSAP384Signer;
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inline void CreateECDSAP384RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
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{
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CreateECDSARandomKeys (NID_secp384r1, ECDSAP384_KEY_LENGTH, signingPrivateKey, signingPublicKey);
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}
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// ECDSA_SHA512_P521
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const size_t ECDSAP521_KEY_LENGTH = 132;
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typedef ECDSAVerifier<SHA512Hash, NID_secp521r1, ECDSAP521_KEY_LENGTH> ECDSAP521Verifier;
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typedef ECDSASigner<SHA512Hash, NID_secp521r1, ECDSAP521_KEY_LENGTH> ECDSAP521Signer;
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inline void CreateECDSAP521RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
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{
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CreateECDSARandomKeys (NID_secp521r1, ECDSAP521_KEY_LENGTH, signingPrivateKey, signingPublicKey);
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}
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// EdDSA
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class EDDSA25519Verifier: public Verifier
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{
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public:
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EDDSA25519Verifier ();
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void SetPublicKey (const uint8_t * signingKey);
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~EDDSA25519Verifier ();
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bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const;
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size_t GetPublicKeyLen () const { return EDDSA25519_PUBLIC_KEY_LENGTH; };
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size_t GetSignatureLen () const { return EDDSA25519_SIGNATURE_LENGTH; };
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private:
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#if OPENSSL_EDDSA
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EVP_MD_CTX * m_MDCtx;
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#else
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EDDSAPoint m_PublicKey;
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uint8_t m_PublicKeyEncoded[EDDSA25519_PUBLIC_KEY_LENGTH];
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#endif
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};
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class EDDSA25519SignerCompat: public Signer
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{
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public:
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EDDSA25519SignerCompat (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey = nullptr);
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// we pass signingPublicKey to check if it matches private key
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~EDDSA25519SignerCompat ();
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void Sign (const uint8_t * buf, int len, uint8_t * signature) const;
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const uint8_t * GetPublicKey () const { return m_PublicKeyEncoded; }; // for keys creation
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private:
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uint8_t m_ExpandedPrivateKey[64];
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uint8_t m_PublicKeyEncoded[EDDSA25519_PUBLIC_KEY_LENGTH];
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};
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#if OPENSSL_EDDSA
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class EDDSA25519Signer: public Signer
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{
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public:
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EDDSA25519Signer (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey = nullptr);
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// we pass signingPublicKey to check if it matches private key
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~EDDSA25519Signer ();
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void Sign (const uint8_t * buf, int len, uint8_t * signature) const;
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private:
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EVP_MD_CTX * m_MDCtx;
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EDDSA25519SignerCompat * m_Fallback;
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};
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#else
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typedef EDDSA25519SignerCompat EDDSA25519Signer;
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#endif
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inline void CreateEDDSA25519RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
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{
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#if OPENSSL_EDDSA
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EVP_PKEY *pkey = NULL;
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EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id (EVP_PKEY_ED25519, NULL);
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EVP_PKEY_keygen_init (pctx);
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EVP_PKEY_keygen (pctx, &pkey);
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EVP_PKEY_CTX_free (pctx);
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size_t len = EDDSA25519_PUBLIC_KEY_LENGTH;
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EVP_PKEY_get_raw_public_key (pkey, signingPublicKey, &len);
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len = EDDSA25519_PRIVATE_KEY_LENGTH;
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EVP_PKEY_get_raw_private_key (pkey, signingPrivateKey, &len);
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EVP_PKEY_free (pkey);
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#else
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RAND_bytes (signingPrivateKey, EDDSA25519_PRIVATE_KEY_LENGTH);
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EDDSA25519Signer signer (signingPrivateKey);
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memcpy (signingPublicKey, signer.GetPublicKey (), EDDSA25519_PUBLIC_KEY_LENGTH);
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#endif
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}
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// ГОСТ Р 34.11
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struct GOSTR3411_256_Hash
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{
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static void CalculateHash (const uint8_t * buf, size_t len, uint8_t * digest)
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{
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GOSTR3411_2012_256 (buf, len, digest);
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}
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enum { hashLen = 32 };
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};
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struct GOSTR3411_512_Hash
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{
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static void CalculateHash (const uint8_t * buf, size_t len, uint8_t * digest)
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{
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GOSTR3411_2012_512 (buf, len, digest);
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}
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enum { hashLen = 64 };
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};
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// ГОСТ Р 34.10
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const size_t GOSTR3410_256_PUBLIC_KEY_LENGTH = 64;
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const size_t GOSTR3410_512_PUBLIC_KEY_LENGTH = 128;
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template<typename Hash>
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class GOSTR3410Verifier: public Verifier
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{
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public:
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enum { keyLen = Hash::hashLen };
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GOSTR3410Verifier (GOSTR3410ParamSet paramSet):
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m_ParamSet (paramSet), m_PublicKey (nullptr)
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{
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}
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void SetPublicKey (const uint8_t * signingKey)
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{
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BIGNUM * x = BN_bin2bn (signingKey, GetPublicKeyLen ()/2, NULL);
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BIGNUM * y = BN_bin2bn (signingKey + GetPublicKeyLen ()/2, GetPublicKeyLen ()/2, NULL);
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m_PublicKey = GetGOSTR3410Curve (m_ParamSet)->CreatePoint (x, y);
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BN_free (x); BN_free (y);
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}
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~GOSTR3410Verifier ()
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{
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if (m_PublicKey) EC_POINT_free (m_PublicKey);
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}
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bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
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{
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uint8_t digest[Hash::hashLen];
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Hash::CalculateHash (buf, len, digest);
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BIGNUM * d = BN_bin2bn (digest, Hash::hashLen, nullptr);
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BIGNUM * r = BN_bin2bn (signature, GetSignatureLen ()/2, NULL);
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BIGNUM * s = BN_bin2bn (signature + GetSignatureLen ()/2, GetSignatureLen ()/2, NULL);
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bool ret = GetGOSTR3410Curve (m_ParamSet)->Verify (m_PublicKey, d, r, s);
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BN_free (d); BN_free (r); BN_free (s);
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return ret;
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}
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size_t GetPublicKeyLen () const { return keyLen*2; }
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size_t GetSignatureLen () const { return keyLen*2; }
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private:
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GOSTR3410ParamSet m_ParamSet;
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EC_POINT * m_PublicKey;
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};
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template<typename Hash>
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class GOSTR3410Signer: public Signer
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{
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public:
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enum { keyLen = Hash::hashLen };
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GOSTR3410Signer (GOSTR3410ParamSet paramSet, const uint8_t * signingPrivateKey):
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m_ParamSet (paramSet)
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{
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m_PrivateKey = BN_bin2bn (signingPrivateKey, keyLen, nullptr);
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}
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~GOSTR3410Signer () { BN_free (m_PrivateKey); }
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void Sign (const uint8_t * buf, int len, uint8_t * signature) const
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{
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uint8_t digest[Hash::hashLen];
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Hash::CalculateHash (buf, len, digest);
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BIGNUM * d = BN_bin2bn (digest, Hash::hashLen, nullptr);
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BIGNUM * r = BN_new (), * s = BN_new ();
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GetGOSTR3410Curve (m_ParamSet)->Sign (m_PrivateKey, d, r, s);
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bn2buf (r, signature, keyLen);
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bn2buf (s, signature + keyLen, keyLen);
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BN_free (d); BN_free (r); BN_free (s);
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}
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private:
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GOSTR3410ParamSet m_ParamSet;
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BIGNUM * m_PrivateKey;
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};
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inline void CreateGOSTR3410RandomKeys (GOSTR3410ParamSet paramSet, uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
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{
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const auto& curve = GetGOSTR3410Curve (paramSet);
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auto keyLen = curve->GetKeyLen ();
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RAND_bytes (signingPrivateKey, keyLen);
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BIGNUM * priv = BN_bin2bn (signingPrivateKey, keyLen, nullptr);
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auto pub = curve->MulP (priv);
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BN_free (priv);
|
||
BIGNUM * x = BN_new (), * y = BN_new ();
|
||
curve->GetXY (pub, x, y);
|
||
EC_POINT_free (pub);
|
||
bn2buf (x, signingPublicKey, keyLen);
|
||
bn2buf (y, signingPublicKey + keyLen, keyLen);
|
||
BN_free (x); BN_free (y);
|
||
}
|
||
|
||
typedef GOSTR3410Verifier<GOSTR3411_256_Hash> GOSTR3410_256_Verifier;
|
||
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);
|
||
}
|
||
}
|
||
}
|
||
|
||
#endif
|