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