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/*
* ECDSA Signature
* (C) 2007 Falko Strenzke, FlexSecure GmbH
* (C) 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/ecdsa_sig.h>
namespace Botan {
ECDSA_Signature::ECDSA_Signature(const MemoryRegion<byte>& ber)
{
BER_Decoder(ber)
.start_cons(SEQUENCE)
.decode(m_r)
.decode(m_s)
.end_cons()
.verify_end();
}
MemoryVector<byte> ECDSA_Signature::DER_encode() const
{
return DER_Encoder()
.start_cons(SEQUENCE)
.encode(get_r())
.encode(get_s())
.end_cons()
.get_contents();
}
MemoryVector<byte> 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 decode_concatenation(const MemoryRegion<byte>& concat)
{
if(concat.size() % 2 != 0)
throw Invalid_Argument("Erroneous length of signature");
u32bit rs_len = concat.size()/2;
SecureVector<byte> sv_r;
SecureVector<byte> sv_s;
sv_r.set(concat.begin(), rs_len);
sv_s.set(&concat[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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