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/*
* OAEP
* (C) 1999-2007,2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_OAEP_H_
#define BOTAN_OAEP_H_
#include <botan/eme.h>
#include <botan/hash.h>
namespace Botan {
/**
* OAEP (called EME1 in IEEE 1363 and in earlier versions of the library)
* as specified in PKCS#1 v2.0 (RFC 2437)
*/
class BOTAN_PUBLIC_API(2,0) OAEP final : public EME
{
public:
size_t maximum_input_size(size_t) const override;
/**
* @param hash function to use for hashing (takes ownership)
* @param P an optional label. Normally empty.
*/
OAEP(HashFunction* hash, const std::string& P = "");
/**
* @param hash function to use for hashing (takes ownership)
* @param mgf1_hash function to use for MGF1 (takes ownership)
* @param P an optional label. Normally empty.
*/
OAEP(HashFunction* hash,
HashFunction* mgf1_hash,
const std::string& P = "");
private:
secure_vector<uint8_t> pad(const uint8_t in[],
size_t in_length,
size_t key_length,
RandomNumberGenerator& rng) const override;
secure_vector<uint8_t> unpad(uint8_t& valid_mask,
const uint8_t in[],
size_t in_len) const override;
secure_vector<uint8_t> m_Phash;
std::unique_ptr<HashFunction> m_mgf1_hash;
};
secure_vector<uint8_t>
BOTAN_TEST_API oaep_find_delim(uint8_t& valid_mask,
const uint8_t input[], size_t input_len,
const secure_vector<uint8_t>& Phash);
}
#endif
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