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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#ifndef OPENVPN_PKI_PKCS1_H
#define OPENVPN_PKI_PKCS1_H
#include <cstring>
#include <openvpn/common/size.hpp>
#include <openvpn/buffer/buffer.hpp>
// from http://www.ietf.org/rfc/rfc3447.txt
namespace openvpn::PKCS1::DigestPrefix { // CONST GLOBAL
namespace {
// clang-format off
const unsigned char MD2[] = {
0x30, 0x20, 0x30, 0x0c, 0x06, 0x08,
0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x02, 0x02, 0x05, 0x00, 0x04, 0x10
};
const unsigned char MD5[] = {
0x30, 0x20, 0x30, 0x0c, 0x06, 0x08,
0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
0x02, 0x05, 0x05, 0x00, 0x04, 0x10
};
const unsigned char SHA1[] = {
0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05,
0x00, 0x04, 0x14
};
const unsigned char SHA256[] = {
0x30, 0x31, 0x30, 0x0d, 0x06, 0x09,
0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x01, 0x05, 0x00, 0x04,
0x20 };
const unsigned char SHA384[] = {
0x30, 0x41, 0x30, 0x0d, 0x06, 0x09,
0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x02, 0x05, 0x00, 0x04,
0x30
};
const unsigned char SHA512[] = {
0x30, 0x51, 0x30, 0x0d, 0x06, 0x09,
0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x03, 0x05, 0x00, 0x04,
0x40
};
// clang-format on
} // namespace
/**
* Class that parses an PKCS #1 header (RFC 3447) to identify the used digest type
* @tparam T the type of the crypto library that used should be used for the digest algorithm identification
*/
template <typename T>
class Parse
{
public:
Parse(const T none,
const T md2,
const T md5,
const T sha1,
const T sha256,
const T sha384,
const T sha512)
: none_(none),
md2_(md2),
md5_(md5),
sha1_(sha1),
sha256_(sha256),
sha384_(sha384),
sha512_(sha512)
{
}
/** Constructor for TLS libraries that no longer support MD2 */
Parse(const T none,
const T md5,
const T sha1,
const T sha256,
const T sha384,
const T sha512)
: none_(none),
md2_(none),
md5_(md5),
sha1_(sha1),
sha256_(sha256),
sha384_(sha384),
sha512_(sha512)
{
}
T alg_from_prefix(Buffer &buf) const
{
if (match(buf, MD2, sizeof(MD2)))
return md2_;
else if (match(buf, MD5, sizeof(MD5)))
return md5_;
else if (match(buf, SHA1, sizeof(SHA1)))
return sha1_;
else if (match(buf, SHA256, sizeof(SHA256)))
return sha256_;
else if (match(buf, SHA384, sizeof(SHA384)))
return sha384_;
else if (match(buf, SHA512, sizeof(SHA512)))
return sha512_;
else
return none_;
}
private:
bool match(Buffer &buf, const unsigned char *data, const size_t size) const
{
if (buf.size() < size)
return false;
else if (std::memcmp(buf.c_data(), data, size) == 0)
{
buf.advance(size);
return true;
}
else
return false;
}
const T none_, md2_, md5_, sha1_, sha256_, sha384_, sha512_;
};
} // namespace openvpn::PKCS1::DigestPrefix
#endif
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