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#include <botan/bigint.h>
#include <botan/ecdsa.h>
#include <memory>
namespace Botan {
ECDSA_Signature::ECDSA_Signature(const BigInt& r, const BigInt& s)
: m_r(r),
m_s(s)
{}
ECDSA_Signature::ECDSA_Signature(ECDSA_Signature const& other)
: m_r(other.m_r),
m_s(other.m_s)
{}
ECDSA_Signature const& ECDSA_Signature::operator=(ECDSA_Signature const& other)
{
m_r = other.m_r;
m_s = other.m_s;
return *this;
}
bool operator== ( ECDSA_Signature const& lhs, ECDSA_Signature const& rhs )
{
return (lhs.get_r() == rhs.get_r() && lhs.get_s() == rhs.get_s());
}
ECDSA_Signature_Decoder* ECDSA_Signature::x509_decoder()
{
return new ECDSA_Signature_Decoder(this);
}
ECDSA_Signature_Encoder* ECDSA_Signature::x509_encoder() const
{
return new ECDSA_Signature_Encoder(this);
}
SecureVector<byte> const ECDSA_Signature::get_concatenation() const
{
u32bit enc_len = m_r > m_s ? m_r.bytes() : m_s.bytes(); // use the larger
SecureVector<byte> sv_r = BigInt::encode_1363 ( m_r, enc_len );
SecureVector<byte> sv_s = BigInt::encode_1363 ( m_s, enc_len );
SecureVector<byte> result(sv_r);
result.append(sv_s);
return result;
}
ECDSA_Signature const decode_seq(MemoryRegion<byte> const& seq)
{
ECDSA_Signature sig;
std::auto_ptr<ECDSA_Signature_Decoder> dec(sig.x509_decoder());
dec->signature_bits(seq);
return sig;
}
ECDSA_Signature const decode_concatenation(MemoryRegion<byte> const& concatenation)
{
if(concatenation.size() % 2 != 0)
{
throw Invalid_Argument("Erroneous length of signature");
}
u32bit rs_len = concatenation.size()/2;
SecureVector<byte> sv_r;
SecureVector<byte> sv_s;
sv_r.set(concatenation.begin(), rs_len);
sv_s.set(&concatenation[rs_len], rs_len);
BigInt r = BigInt::decode ( sv_r, sv_r.size());
BigInt s = BigInt::decode (sv_s, sv_s.size());
return ECDSA_Signature(r, s);
}
}
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