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/*
* KeyUsage
* (C) 1999-2007,2016 Jack Lloyd
* (C) 2016 René Korthaus, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/key_constraint.h>
#include <botan/pk_keys.h>
#include <vector>
namespace Botan {
std::string key_constraints_to_string(Key_Constraints constraints)
{
std::vector<std::string> str;
if(constraints == NO_CONSTRAINTS)
return "no_constraints";
if(constraints & DIGITAL_SIGNATURE)
str.push_back("digital_signature");
if(constraints & NON_REPUDIATION)
str.push_back("non_repudiation");
if(constraints & KEY_ENCIPHERMENT)
str.push_back("key_encipherment");
if(constraints & DATA_ENCIPHERMENT)
str.push_back("data_encipherment");
if(constraints & KEY_AGREEMENT)
str.push_back("key_agreement");
if(constraints & KEY_CERT_SIGN)
str.push_back("key_cert_sign");
if(constraints & CRL_SIGN)
str.push_back("crl_sign");
if(constraints & ENCIPHER_ONLY)
str.push_back("encipher_only");
if(constraints & DECIPHER_ONLY)
str.push_back("decipher_only");
// Not 0 (checked at start) but nothing matched above!
if(str.empty())
return "other_unknown_constraints";
if(str.size() == 1)
return str[0];
std::string out;
for(size_t i = 0; i < str.size() - 1; ++i)
{
out += str[i];
out += ',';
}
out += str[str.size() - 1];
return out;
}
/*
* Make sure the given key constraints are permitted for the given key type
*/
void verify_cert_constraints_valid_for_key_type(const Public_Key& pub_key,
Key_Constraints constraints)
{
const std::string name = pub_key.algo_name();
size_t permitted = 0;
if(name == "DH" || name == "ECDH")
{
permitted |= KEY_AGREEMENT | ENCIPHER_ONLY | DECIPHER_ONLY;
}
if(name == "RSA" || name == "ElGamal")
{
permitted |= KEY_ENCIPHERMENT | DATA_ENCIPHERMENT;
}
if(name == "RSA" || name == "DSA" || name == "ECDSA" || name == "ECGDSA" || name == "ECKCDSA" || name == "GOST-34.10")
{
permitted |= DIGITAL_SIGNATURE | NON_REPUDIATION | KEY_CERT_SIGN | CRL_SIGN;
}
if((constraints & permitted) != constraints)
{
throw Exception("Invalid " + name + " constraints " + key_constraints_to_string(constraints));
}
}
}
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