crypto/rsa/rsa_locl.h

   1 /*
   2  * Copyright 2006-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/rsa.h>
  11 #include "internal/refcount.h"
  12
  13 #define RSA_MAX_PRIME_NUM 16
  14 #define RSA_MIN_PRIME_SIZE 64
  15 #define RSA_MIN_MODULUS_BITS    512
  16
  17 typedef struct rsa_prime_info_st {
  18     BIGNUM *r;
  19     BIGNUM *d;
  20     BIGNUM *t;
  21     /* save product of primes prior to this one */
  22     BIGNUM *pp;
  23     BN_MONT_CTX *m;
  24 } RSA_PRIME_INFO;
  25
  26 DECLARE_ASN1_ITEM(RSA_PRIME_INFO)
  27 DEFINE_STACK_OF(RSA_PRIME_INFO)
  28
  29 struct rsa_st {
  30     /*
  31      * The first parameter is used to pickup errors where this is passed
  32      * instead of an EVP_PKEY, it is set to 0
  33      */
  34     int pad;
  35     int32_t version;
  36     const RSA_METHOD *meth;
  37     /* functional reference if 'meth' is ENGINE-provided */
  38     ENGINE *engine;
  39     BIGNUM *n;
  40     BIGNUM *e;
  41     BIGNUM *d;
  42     BIGNUM *p;
  43     BIGNUM *q;
  44     BIGNUM *dmp1;
  45     BIGNUM *dmq1;
  46     BIGNUM *iqmp;
  47     /* for multi-prime RSA, defined in RFC 8017 */
  48     STACK_OF(RSA_PRIME_INFO) *prime_infos;
  49     /* If a PSS only key this contains the parameter restrictions */
  50     RSA_PSS_PARAMS *pss;
  51     /* be careful using this if the RSA structure is shared */
  52     CRYPTO_EX_DATA ex_data;
  53     CRYPTO_REF_COUNT references;
  54     int flags;
  55     /* Used to cache montgomery values */
  56     BN_MONT_CTX *_method_mod_n;
  57     BN_MONT_CTX *_method_mod_p;
  58     BN_MONT_CTX *_method_mod_q;
  59     /*
  60      * all BIGNUM values are actually in the following data, if it is not
  61      * NULL
  62      */
  63     char *bignum_data;
  64     BN_BLINDING *blinding;
  65     BN_BLINDING *mt_blinding;
  66     CRYPTO_RWLOCK *lock;
  67 };
  68
  69 struct rsa_meth_st {
  70     char *name;
  71     int (*rsa_pub_enc) (int flen, const unsigned char *from,
  72                         unsigned char *to, RSA *rsa, int padding);
  73     int (*rsa_pub_dec) (int flen, const unsigned char *from,
  74                         unsigned char *to, RSA *rsa, int padding);
  75     int (*rsa_priv_enc) (int flen, const unsigned char *from,
  76                          unsigned char *to, RSA *rsa, int padding);
  77     int (*rsa_priv_dec) (int flen, const unsigned char *from,
  78                          unsigned char *to, RSA *rsa, int padding);
  79     /* Can be null */
  80     int (*rsa_mod_exp) (BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx);
  81     /* Can be null */
  82     int (*bn_mod_exp) (BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
  83                        const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
  84     /* called at new */
  85     int (*init) (RSA *rsa);
  86     /* called at free */
  87     int (*finish) (RSA *rsa);
  88     /* RSA_METHOD_FLAG_* things */
  89     int flags;
  90     /* may be needed! */
  91     char *app_data;
  92     /*
  93      * New sign and verify functions: some libraries don't allow arbitrary
  94      * data to be signed/verified: this allows them to be used. Note: for
  95      * this to work the RSA_public_decrypt() and RSA_private_encrypt() should
  96      * *NOT* be used RSA_sign(), RSA_verify() should be used instead.
  97      */
  98     int (*rsa_sign) (int type,
  99                      const unsigned char *m, unsigned int m_length,
 100                      unsigned char *sigret, unsigned int *siglen,
 101                      const RSA *rsa);
 102     int (*rsa_verify) (int dtype, const unsigned char *m,
 103                        unsigned int m_length, const unsigned char *sigbuf,
 104                        unsigned int siglen, const RSA *rsa);
 105     /*
 106      * If this callback is NULL, the builtin software RSA key-gen will be
 107      * used. This is for behavioural compatibility whilst the code gets
 108      * rewired, but one day it would be nice to assume there are no such
 109      * things as "builtin software" implementations.
 110      */
 111     int (*rsa_keygen) (RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
 112     int (*rsa_multi_prime_keygen) (RSA *rsa, int bits, int primes,
 113                                    BIGNUM *e, BN_GENCB *cb);
 114 };
 115
 116 extern int int_rsa_verify(int dtype, const unsigned char *m,
 117                           unsigned int m_len, unsigned char *rm,
 118                           size_t *prm_len, const unsigned char *sigbuf,
 119                           size_t siglen, RSA *rsa);
 120 /* Macros to test if a pkey or ctx is for a PSS key */
 121 #define pkey_is_pss(pkey) (pkey->ameth->pkey_id == EVP_PKEY_RSA_PSS)
 122 #define pkey_ctx_is_pss(ctx) (ctx->pmeth->pkey_id == EVP_PKEY_RSA_PSS)
 123
 124 RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd,
 125                                       const EVP_MD *mgf1md, int saltlen);
 126 int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd,
 127                       const EVP_MD **pmgf1md, int *psaltlen);
 128 /* internal function to clear and free multi-prime parameters */
 129 void rsa_multip_info_free_ex(RSA_PRIME_INFO *pinfo);
 130 void rsa_multip_info_free(RSA_PRIME_INFO *pinfo);
 131 RSA_PRIME_INFO *rsa_multip_info_new(void);
 132 int rsa_multip_calc_product(RSA *rsa);
 133 int rsa_multip_cap(int bits);