/*

 * Copyright 2006-2017 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <openssl/rsa.h>

#include "internal/refcount.h"

#define RSA_MAX_PRIME_NUM       5

#define RSA_MIN_MODULUS_BITS    512

typedef struct rsa_prime_info_st {

    BIGNUM *r;

    BIGNUM *d;

    BIGNUM *t;

    /* save product of primes prior to this one */

    BIGNUM *pp;

    BN_MONT_CTX *m;

} RSA_PRIME_INFO;

DECLARE_ASN1_ITEM(RSA_PRIME_INFO)

DEFINE_STACK_OF(RSA_PRIME_INFO)

struct rsa_st {

    /*

     * The first parameter is used to pickup errors where this is passed

     * instead of an EVP_PKEY, it is set to 0

     */

    int pad;

    int32_t version;

    const RSA_METHOD *meth;

    /* functional reference if 'meth' is ENGINE-provided */

    ENGINE *engine;

    BIGNUM *n;

    BIGNUM *e;

    BIGNUM *d;

    BIGNUM *p;

    BIGNUM *q;

    BIGNUM *dmp1;

    BIGNUM *dmq1;

    BIGNUM *iqmp;

    /* for multi-prime RSA, defined in RFC 8017 */

    STACK_OF(RSA_PRIME_INFO) *prime_infos;

    /* If a PSS only key this contains the parameter restrictions */

    RSA_PSS_PARAMS *pss;

    /* be careful using this if the RSA structure is shared */

    CRYPTO_EX_DATA ex_data;

    CRYPTO_REF_COUNT references;

    int flags;

    /* Used to cache montgomery values */

    BN_MONT_CTX *_method_mod_n;

    BN_MONT_CTX *_method_mod_p;

    BN_MONT_CTX *_method_mod_q;

    /*

     * all BIGNUM values are actually in the following data, if it is not

     * NULL

     */

    char *bignum_data;

    BN_BLINDING *blinding;

    BN_BLINDING *mt_blinding;

    CRYPTO_RWLOCK *lock;

};

struct rsa_meth_st {

    char *name;

    int (*rsa_pub_enc) (int flen, const unsigned char *from,

                        unsigned char *to, RSA *rsa, int padding);

    int (*rsa_pub_dec) (int flen, const unsigned char *from,

                        unsigned char *to, RSA *rsa, int padding);

    int (*rsa_priv_enc) (int flen, const unsigned char *from,

                         unsigned char *to, RSA *rsa, int padding);

    int (*rsa_priv_dec) (int flen, const unsigned char *from,

                         unsigned char *to, RSA *rsa, int padding);

    /* Can be null */

    int (*rsa_mod_exp) (BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx);

    /* Can be null */

    int (*bn_mod_exp) (BIGNUM *r, const BIGNUM *a, const BIGNUM *p,

                       const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);

    /* called at new */

    int (*init) (RSA *rsa);

    /* called at free */

    int (*finish) (RSA *rsa);

    /* RSA_METHOD_FLAG_* things */

    int flags;

    /* may be needed! */

    char *app_data;

    /*

     * New sign and verify functions: some libraries don't allow arbitrary

     * data to be signed/verified: this allows them to be used. Note: for

     * this to work the RSA_public_decrypt() and RSA_private_encrypt() should

     * *NOT* be used RSA_sign(), RSA_verify() should be used instead.

     */

    int (*rsa_sign) (int type,

                     const unsigned char *m, unsigned int m_length,

                     unsigned char *sigret, unsigned int *siglen,

                     const RSA *rsa);

    int (*rsa_verify) (int dtype, const unsigned char *m,

                       unsigned int m_length, const unsigned char *sigbuf,

                       unsigned int siglen, const RSA *rsa);

    /*

     * If this callback is NULL, the builtin software RSA key-gen will be

     * used. This is for behavioural compatibility whilst the code gets

     * rewired, but one day it would be nice to assume there are no such

     * things as "builtin software" implementations.

     */

    int (*rsa_keygen) (RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);

    int (*rsa_multi_prime_keygen) (RSA *rsa, int bits, int primes,

                                   BIGNUM *e, BN_GENCB *cb);

};

extern int int_rsa_verify(int dtype, const unsigned char *m,

                          unsigned int m_len, unsigned char *rm,

                          size_t *prm_len, const unsigned char *sigbuf,

                          size_t siglen, RSA *rsa);

/* Macros to test if a pkey or ctx is for a PSS key */

#define pkey_is_pss(pkey) (pkey->ameth->pkey_id == EVP_PKEY_RSA_PSS)

#define pkey_ctx_is_pss(ctx) (ctx->pmeth->pkey_id == EVP_PKEY_RSA_PSS)

RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd,

                                      const EVP_MD *mgf1md, int saltlen);

int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd,

                      const EVP_MD **pmgf1md, int *psaltlen);

/* internal function to clear and free multi-prime parameters */

void rsa_multip_info_free_ex(RSA_PRIME_INFO *pinfo);

void rsa_multip_info_free(RSA_PRIME_INFO *pinfo);

RSA_PRIME_INFO *rsa_multip_info_new(void);

int rsa_multip_calc_product(RSA *rsa);

int rsa_multip_cap(int bits);