1 files changed, 72 insertions, 0 deletions
diff --git a/src/pubkey/ecdsa/ecdsa.cpp b/src/pubkey/ecdsa/ecdsa.cpp
new file mode 100644
index 000000000..04dc1e529
--- /dev/null
+++ b/src/pubkey/ecdsa/ecdsa.cpp
@@ -0,0 +1,72 @@
+#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);
+   }
+
+}