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use constants instead magic numbers

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orignal 2014-10-15 14:04:23 -04:00
parent ef78533f16
commit c96694237f
1 changed files with 24 additions and 16 deletions
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40
Signature.h
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@ -31,23 +31,26 @@ namespace crypto
virtual void Sign (CryptoPP::RandomNumberGenerator& rnd, 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.Initialize (dsap, dsaq, dsag, CryptoPP::Integer (signingKey, 128));
m_PublicKey.Initialize (dsap, dsaq, dsag, CryptoPP::Integer (signingKey, DSA_PUBLIC_KEY_LENGTH));
}
bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
CryptoPP::DSA::Verifier verifier (m_PublicKey);
return verifier.VerifyMessage (buf, len, signature, 40);
return verifier.VerifyMessage (buf, len, signature, DSA_SIGNATURE_LENGTH);
}
size_t GetPublicKeyLen () const { return 128; };
size_t GetSignatureLen () const { return 40; };
size_t GetPublicKeyLen () const { return DSA_PUBLIC_KEY_LENGTH; };
size_t GetSignatureLen () const { return DSA_SIGNATURE_LENGTH; };
private:
@ -60,7 +63,7 @@ namespace crypto
DSASigner (const uint8_t * signingPrivateKey)
{
m_PrivateKey.Initialize (dsap, dsaq, dsag, CryptoPP::Integer (signingPrivateKey, 20));
m_PrivateKey.Initialize (dsap, dsaq, dsag, CryptoPP::Integer (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH));
}
void Sign (CryptoPP::RandomNumberGenerator& rnd, const uint8_t * buf, int len, uint8_t * signature) const
@ -80,10 +83,15 @@ namespace crypto
CryptoPP::DSA::PublicKey publicKey;
privateKey.Initialize (rnd, dsap, dsaq, dsag);
privateKey.MakePublicKey (publicKey);
privateKey.GetPrivateExponent ().Encode (signingPrivateKey, 20);
publicKey.GetPublicElement ().Encode (signingPublicKey, 128);
privateKey.GetPrivateExponent ().Encode (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH);
publicKey.GetPublicElement ().Encode (signingPublicKey, DSA_PUBLIC_KEY_LENGTH);
}
const size_t ECDSAP256_PUBLIC_KEY_LENGTH = 64;
const size_t ECDSAP256_PUBLIC_KEY_HALF_LENGTH = ECDSAP256_PUBLIC_KEY_LENGTH/2;
const size_t ECDSAP256_SIGNATURE_LENGTH = 64;
const size_t ECDSAP256_PRIVATE_KEY_LENGTH = ECDSAP256_SIGNATURE_LENGTH/2;
class ECDSAP256Verifier: public Verifier
{
public:
@ -91,18 +99,18 @@ namespace crypto
ECDSAP256Verifier (const uint8_t * signingKey)
{
m_PublicKey.Initialize (CryptoPP::ASN1::secp256r1(),
CryptoPP::ECP::Point (CryptoPP::Integer (signingKey, 32),
CryptoPP::Integer (signingKey + 32, 32)));
CryptoPP::ECP::Point (CryptoPP::Integer (signingKey, ECDSAP256_PUBLIC_KEY_HALF_LENGTH),
CryptoPP::Integer (signingKey + ECDSAP256_PUBLIC_KEY_HALF_LENGTH, ECDSAP256_PUBLIC_KEY_HALF_LENGTH)));
}
bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
{
CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::Verifier verifier (m_PublicKey);
return verifier.VerifyMessage (buf, len, signature, 64);
return verifier.VerifyMessage (buf, len, signature, ECDSAP256_SIGNATURE_LENGTH);
}
size_t GetPublicKeyLen () const { return 64; };
size_t GetSignatureLen () const { return 64; };
size_t GetPublicKeyLen () const { return ECDSAP256_PUBLIC_KEY_LENGTH; };
size_t GetSignatureLen () const { return ECDSAP256_SIGNATURE_LENGTH; };
private:
@ -115,7 +123,7 @@ namespace crypto
ECDSAP256Signer (const uint8_t * signingPrivateKey)
{
m_PrivateKey.Initialize (CryptoPP::ASN1::secp256r1(), CryptoPP::Integer (signingPrivateKey, 32));
m_PrivateKey.Initialize (CryptoPP::ASN1::secp256r1(), CryptoPP::Integer (signingPrivateKey, ECDSAP256_PRIVATE_KEY_LENGTH));
}
void Sign (CryptoPP::RandomNumberGenerator& rnd, const uint8_t * buf, int len, uint8_t * signature) const
@ -135,10 +143,10 @@ namespace crypto
CryptoPP::ECDSA<CryptoPP::ECP, CryptoPP::SHA256>::PublicKey publicKey;
privateKey.Initialize (rnd, CryptoPP::ASN1::secp256r1());
privateKey.MakePublicKey (publicKey);
privateKey.GetPrivateExponent ().Encode (signingPrivateKey, 32);
privateKey.GetPrivateExponent ().Encode (signingPrivateKey, ECDSAP256_PRIVATE_KEY_LENGTH);
auto q = publicKey.GetPublicElement ();
q.x.Encode (signingPublicKey, 32);
q.y.Encode (signingPublicKey + 32, 32);
q.x.Encode (signingPublicKey, ECDSAP256_PUBLIC_KEY_HALF_LENGTH);
q.y.Encode (signingPublicKey + ECDSAP256_PUBLIC_KEY_HALF_LENGTH, ECDSAP256_PUBLIC_KEY_HALF_LENGTH);
}
}
}