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443 lines
12 KiB
C++
443 lines
12 KiB
C++
#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/sha.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/rsa.h>
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#include <openssl/rand.h>
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#include <openssl/evp.h>
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#include "Crypto.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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};
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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 (const uint8_t * signingKey)
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{
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m_PublicKey = DSA_new ();
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m_PublicKey->p = BN_dup (dsap);
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m_PublicKey->q = BN_dup (dsaq);
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m_PublicKey->g = BN_dup (dsag);
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m_PublicKey->priv_key = NULL;
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m_PublicKey->pub_key = BN_bin2bn (signingKey, DSA_PUBLIC_KEY_LENGTH, 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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sig->r = BN_bin2bn (signature, DSA_SIGNATURE_LENGTH/2, NULL);
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sig->s = 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)
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{
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m_PrivateKey = DSA_new ();
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m_PrivateKey->p = BN_dup (dsap);
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m_PrivateKey->q = BN_dup (dsaq);
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m_PrivateKey->g = BN_dup (dsag);
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m_PrivateKey->priv_key = BN_bin2bn (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH, NULL);
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m_PrivateKey->pub_key = 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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bn2buf (sig->r, signature, DSA_SIGNATURE_LENGTH/2);
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bn2buf (sig->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 = DSA_new ();
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dsa->p = BN_dup (dsap);
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dsa->q = BN_dup (dsaq);
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dsa->g = BN_dup (dsag);
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dsa->priv_key = NULL;
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dsa->pub_key = NULL;
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DSA_generate_key (dsa);
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bn2buf (dsa->priv_key, signingPrivateKey, DSA_PRIVATE_KEY_LENGTH);
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bn2buf (dsa->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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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 (const uint8_t * signingKey)
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{
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m_PublicKey = EC_KEY_new_by_curve_name (curve);
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EC_KEY_set_public_key_affine_coordinates (m_PublicKey,
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BN_bin2bn (signingKey, keyLen/2, NULL),
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BN_bin2bn (signingKey + keyLen/2, keyLen/2, NULL));
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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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sig->r = BN_bin2bn (signature, GetSignatureLen ()/2, NULL);
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sig->s = BN_bin2bn (signature + GetSignatureLen ()/2, GetSignatureLen ()/2, NULL);
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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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// signatureLen = keyLen
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bn2buf (sig->r, signature, keyLen/2);
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bn2buf (sig->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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// RSA
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template<typename Hash, int type, size_t keyLen>
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class RSAVerifier: public Verifier
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{
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public:
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RSAVerifier (const uint8_t * signingKey)
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{
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m_PublicKey = RSA_new ();
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memset (m_PublicKey, 0, sizeof (RSA));
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m_PublicKey->e = BN_dup (rsae);
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m_PublicKey->n = BN_bin2bn (signingKey, keyLen, NULL);
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}
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~RSAVerifier ()
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{
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RSA_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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return RSA_verify (type, digest, Hash::hashLen, signature, GetSignatureLen (), m_PublicKey);
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}
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size_t GetPublicKeyLen () const { return keyLen; }
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size_t GetSignatureLen () const { return keyLen; }
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size_t GetPrivateKeyLen () const { return GetSignatureLen ()*2; };
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private:
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RSA * m_PublicKey;
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};
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template<typename Hash, int type, size_t keyLen>
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class RSASigner: public Signer
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{
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public:
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RSASigner (const uint8_t * signingPrivateKey)
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{
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m_PrivateKey = RSA_new ();
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memset (m_PrivateKey, 0, sizeof (RSA));
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m_PrivateKey->e = BN_dup (rsae);
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m_PrivateKey->n = BN_bin2bn (signingPrivateKey, keyLen, NULL);
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m_PrivateKey->d = BN_bin2bn (signingPrivateKey + keyLen, keyLen, NULL);
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}
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~RSASigner ()
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{
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RSA_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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unsigned int signatureLen = keyLen;
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RSA_sign (type, digest, Hash::hashLen, signature, &signatureLen, m_PrivateKey);
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}
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private:
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RSA * m_PrivateKey;
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};
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inline void CreateRSARandomKeys (size_t publicKeyLen, uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
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{
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RSA * rsa = RSA_new ();
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RSA_generate_key_ex (rsa, publicKeyLen*8, rsae, NULL);
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bn2buf (rsa->n, signingPrivateKey, publicKeyLen);
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bn2buf (rsa->d, signingPrivateKey + publicKeyLen, publicKeyLen);
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bn2buf (rsa->n, signingPublicKey, publicKeyLen);
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RSA_free (rsa);
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}
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// RSA_SHA256_2048
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const size_t RSASHA2562048_KEY_LENGTH = 256;
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typedef RSAVerifier<SHA256Hash, NID_sha256, RSASHA2562048_KEY_LENGTH> RSASHA2562048Verifier;
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typedef RSASigner<SHA256Hash, NID_sha256, RSASHA2562048_KEY_LENGTH> RSASHA2562048Signer;
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// RSA_SHA384_3072
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const size_t RSASHA3843072_KEY_LENGTH = 384;
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typedef RSAVerifier<SHA384Hash, NID_sha384, RSASHA3843072_KEY_LENGTH> RSASHA3843072Verifier;
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typedef RSASigner<SHA384Hash, NID_sha384, RSASHA3843072_KEY_LENGTH> RSASHA3843072Signer;
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// RSA_SHA512_4096
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const size_t RSASHA5124096_KEY_LENGTH = 512;
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typedef RSAVerifier<SHA512Hash, NID_sha512, RSASHA5124096_KEY_LENGTH> RSASHA5124096Verifier;
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typedef RSASigner<SHA512Hash, NID_sha512, RSASHA5124096_KEY_LENGTH> RSASHA5124096Signer;
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// EdDSA
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struct EDDSAPoint
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{
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BIGNUM * x, * y;
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EDDSAPoint (): x(nullptr), y(nullptr) {};
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EDDSAPoint (EDDSAPoint&& other): x(nullptr), y(nullptr)
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{ *this = std::move (other); };
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EDDSAPoint (BIGNUM * x1, BIGNUM * y1): x(x1), y(y1) {};
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~EDDSAPoint () { BN_free (x); BN_free (y); };
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EDDSAPoint& operator= (EDDSAPoint&& other)
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{
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if (x) BN_free (x);
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if (y) BN_free (y);
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x = other.x; other.x = nullptr;
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y = other.y; other.y = nullptr;
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return *this;
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}
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bool operator== (const EDDSAPoint& other) const
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{
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return !BN_cmp (x, other.x) && !BN_cmp (y, other.y);
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}
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};
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const size_t EDDSA25519_PUBLIC_KEY_LENGTH = 32;
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const size_t EDDSA25519_SIGNATURE_LENGTH = 64;
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const size_t EDDSA25519_PRIVATE_KEY_LENGTH = 32;
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class EDDSA25519Verifier: public Verifier
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{
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public:
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EDDSA25519Verifier (const uint8_t * signingKey);
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~EDDSA25519Verifier () { BN_CTX_free (m_Ctx); };
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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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BN_CTX * m_Ctx;
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EDDSAPoint m_PublicKey;
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uint8_t m_PublicKeyEncoded[EDDSA25519_PUBLIC_KEY_LENGTH];
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};
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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);
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~EDDSA25519Signer () { BN_CTX_free (m_Ctx); };
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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; };
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private:
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BN_CTX * m_Ctx;
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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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inline void CreateEDDSA25519RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
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{
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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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}
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}
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}
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#endif
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