Method GetPubKeyDER

src/Crypto.cpp:115–159

AString cRSAPrivateKey::GetPubKeyDER(void)
{
	class cPubKey
	{
	public:
		cPubKey(rsa_context * a_Rsa) :
			m_IsValid(false)
		{
			pk_init(&m_Key);
			if (pk_init_ctx(&m_Key, pk_info_from_type(POLARSSL_PK_RSA)) != 0)
			{
				ASSERT(!"Cannot init PrivKey context");
				return;
			}
			if (rsa_copy(pk_rsa(m_Key), a_Rsa) != 0)
			{
				ASSERT(!"Cannot copy PrivKey to PK context");
				return;
			}
			m_IsValid = true;
		}
		
		~cPubKey()
		{
			if (m_IsValid)
			{
				pk_free(&m_Key);
			}
		}
		
		operator pk_context * (void) { return &m_Key; }
		
	protected:
		bool m_IsValid;
		pk_context m_Key;
	} PkCtx(&m_Rsa);
	
	unsigned char buf[3000];
	int res = pk_write_pubkey_der(PkCtx, buf, sizeof(buf));
	if (res < 0)
	{
		return AString();
	}
	return AString((const char *)(buf + sizeof(buf) - res), (size_t)res);
}