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#pragma once
#include <contrib/libs/openssl/include/openssl/bn.h>
#include <contrib/libs/openssl/include/openssl/crypto.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
BIGNUM* S;
} TRwSignature;
/*Rabin–Williams*/
typedef struct TRwInternal TRwKey;
typedef struct {
TRwSignature* (*RwSign)(const unsigned char* dgst, const int dlen, TRwKey* rw);
int (*RwVerify)(const unsigned char* dgst, int dgst_len, TRwSignature* sig, const TRwKey* rw);
int (*RwApply)(BIGNUM* r, BIGNUM* x, BN_CTX* ctx, const TRwKey* rw);
} TRwMethod;
struct TRwInternal {
/* first private multiplier */
BIGNUM* P;
/* second private multiplier */
BIGNUM* Q;
/* n = p*q - RW modulus */
BIGNUM* N;
/* precomputed 2^((3q-5)/8) mod q */
BIGNUM* Twomq;
/* precomputed 2^((9p-11)/8) mod p*/
BIGNUM* Twomp;
/* precomputed q^(p-2) == q^(-1) mod p */
BIGNUM* Iqmp;
/* (q+1) / 8 */
BIGNUM* Dq;
/* (p-3) / 8 */
BIGNUM* Dp;
/* functions for working with RW */
const TRwMethod* Meth;
};
TRwSignature* RwSignatureNew(void);
void RwSignatureFree(TRwSignature* a);
/* RW signing functions */
/* the function can put some tmp values to rw */
int RwPssrSignHash(const unsigned char* from, unsigned char* to, TRwKey* rw, const EVP_MD* md);
int RwPssrSignMsg(const int msgLen, const unsigned char* msg, unsigned char* to, TRwKey* rw, const EVP_MD* md);
/* RW-PSS verification functions */
int RwPssrVerifyHash(const unsigned char* from, const unsigned char* sig, const int sig_len, const TRwKey* rw, const EVP_MD* md);
int RwPssrVerifyMsg(const int msgLen, const unsigned char* msg, const unsigned char* sig, const int sig_len, const TRwKey* rw, const EVP_MD* md);
/* internal functions, use them only if you know what you're doing */
int RwNoPaddingSign(int flen, const unsigned char* from, unsigned char* to, TRwKey* rw);
int RwApply(const int flen, const unsigned char* from, unsigned char* to, const TRwKey* rw);
const TRwMethod* RwDefaultMethods(void);
TRwKey* RwNew(void);
void RwFree(TRwKey* r);
int RwSize(const TRwKey* rw);
int RwModSize(const TRwKey* rw);
TRwKey* RwPublicKeyDup(TRwKey* rw);
TRwKey* RwPrivateKeyDup(TRwKey* rw);
// NOLINTNEXTLINE(readability-identifier-naming)
TRwKey* d2i_RWPublicKey(TRwKey** a, const unsigned char** pp, long length);
// NOLINTNEXTLINE(readability-identifier-naming)
TRwKey* d2i_RWPrivateKey(TRwKey** a, const unsigned char** pp, long length);
int RwGenerateKey(TRwKey* a, int bits);
// NOLINTNEXTLINE(readability-identifier-naming)
int i2d_RWPublicKey(const TRwKey* a, unsigned char** pp);
// NOLINTNEXTLINE(readability-identifier-naming)
int i2d_RWPrivateKey(const TRwKey* a, unsigned char** pp);
int RwPaddingAddPssr(const TRwKey* rw, unsigned char* EM, const unsigned char* mHash, const EVP_MD* Hash, int sLen);
int RwVerifyPssr(const TRwKey* rw, const unsigned char* mHash, const EVP_MD* Hash, const unsigned char* EM, int sLen);
#ifdef __cplusplus
}
#endif
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