diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/bn/bn_blind.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/bn/bn_blind.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/bn/bn_blind.c b/openssl-1.1.0h/crypto/bn/bn_blind.c new file mode 100644 index 0000000..24d1383 --- /dev/null +++ b/openssl-1.1.0h/crypto/bn/bn_blind.c @@ -0,0 +1,289 @@ +/* + * Copyright 1998-2016 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/opensslconf.h> +#include "internal/cryptlib.h" +#include "bn_lcl.h" + +#define BN_BLINDING_COUNTER 32 + +struct bn_blinding_st { + BIGNUM *A; + BIGNUM *Ai; + BIGNUM *e; + BIGNUM *mod; /* just a reference */ + CRYPTO_THREAD_ID tid; + int counter; + unsigned long flags; + BN_MONT_CTX *m_ctx; + int (*bn_mod_exp) (BIGNUM *r, const BIGNUM *a, const BIGNUM *p, + const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx); + CRYPTO_RWLOCK *lock; +}; + +BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod) +{ + BN_BLINDING *ret = NULL; + + bn_check_top(mod); + + if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) { + BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE); + return NULL; + } + + ret->lock = CRYPTO_THREAD_lock_new(); + if (ret->lock == NULL) { + BNerr(BN_F_BN_BLINDING_NEW, ERR_R_MALLOC_FAILURE); + OPENSSL_free(ret); + return NULL; + } + + BN_BLINDING_set_current_thread(ret); + + if (A != NULL) { + if ((ret->A = BN_dup(A)) == NULL) + goto err; + } + + if (Ai != NULL) { + if ((ret->Ai = BN_dup(Ai)) == NULL) + goto err; + } + + /* save a copy of mod in the BN_BLINDING structure */ + if ((ret->mod = BN_dup(mod)) == NULL) + goto err; + + if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0) + BN_set_flags(ret->mod, BN_FLG_CONSTTIME); + + /* + * Set the counter to the special value -1 to indicate that this is + * never-used fresh blinding that does not need updating before first + * use. + */ + ret->counter = -1; + + return ret; + + err: + BN_BLINDING_free(ret); + return NULL; +} + +void BN_BLINDING_free(BN_BLINDING *r) +{ + if (r == NULL) + return; + + BN_free(r->A); + BN_free(r->Ai); + BN_free(r->e); + BN_free(r->mod); + CRYPTO_THREAD_lock_free(r->lock); + OPENSSL_free(r); +} + +int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx) +{ + int ret = 0; + + if ((b->A == NULL) || (b->Ai == NULL)) { + BNerr(BN_F_BN_BLINDING_UPDATE, BN_R_NOT_INITIALIZED); + goto err; + } + + if (b->counter == -1) + b->counter = 0; + + if (++b->counter == BN_BLINDING_COUNTER && b->e != NULL && + !(b->flags & BN_BLINDING_NO_RECREATE)) { + /* re-create blinding parameters */ + if (!BN_BLINDING_create_param(b, NULL, NULL, ctx, NULL, NULL)) + goto err; + } else if (!(b->flags & BN_BLINDING_NO_UPDATE)) { + if (!BN_mod_mul(b->A, b->A, b->A, b->mod, ctx)) + goto err; + if (!BN_mod_mul(b->Ai, b->Ai, b->Ai, b->mod, ctx)) + goto err; + } + + ret = 1; + err: + if (b->counter == BN_BLINDING_COUNTER) + b->counter = 0; + return (ret); +} + +int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) +{ + return BN_BLINDING_convert_ex(n, NULL, b, ctx); +} + +int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx) +{ + int ret = 1; + + bn_check_top(n); + + if ((b->A == NULL) || (b->Ai == NULL)) { + BNerr(BN_F_BN_BLINDING_CONVERT_EX, BN_R_NOT_INITIALIZED); + return (0); + } + + if (b->counter == -1) + /* Fresh blinding, doesn't need updating. */ + b->counter = 0; + else if (!BN_BLINDING_update(b, ctx)) + return (0); + + if (r != NULL) { + if (!BN_copy(r, b->Ai)) + ret = 0; + } + + if (!BN_mod_mul(n, n, b->A, b->mod, ctx)) + ret = 0; + + return ret; +} + +int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx) +{ + return BN_BLINDING_invert_ex(n, NULL, b, ctx); +} + +int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, + BN_CTX *ctx) +{ + int ret; + + bn_check_top(n); + + if (r != NULL) + ret = BN_mod_mul(n, n, r, b->mod, ctx); + else { + if (b->Ai == NULL) { + BNerr(BN_F_BN_BLINDING_INVERT_EX, BN_R_NOT_INITIALIZED); + return (0); + } + ret = BN_mod_mul(n, n, b->Ai, b->mod, ctx); + } + + bn_check_top(n); + return (ret); +} + +int BN_BLINDING_is_current_thread(BN_BLINDING *b) +{ + return CRYPTO_THREAD_compare_id(CRYPTO_THREAD_get_current_id(), b->tid); +} + +void BN_BLINDING_set_current_thread(BN_BLINDING *b) +{ + b->tid = CRYPTO_THREAD_get_current_id(); +} + +int BN_BLINDING_lock(BN_BLINDING *b) +{ + return CRYPTO_THREAD_write_lock(b->lock); +} + +int BN_BLINDING_unlock(BN_BLINDING *b) +{ + return CRYPTO_THREAD_unlock(b->lock); +} + +unsigned long BN_BLINDING_get_flags(const BN_BLINDING *b) +{ + return b->flags; +} + +void BN_BLINDING_set_flags(BN_BLINDING *b, unsigned long flags) +{ + b->flags = flags; +} + +BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b, + const BIGNUM *e, BIGNUM *m, BN_CTX *ctx, + int (*bn_mod_exp) (BIGNUM *r, + const BIGNUM *a, + const BIGNUM *p, + const BIGNUM *m, + BN_CTX *ctx, + BN_MONT_CTX *m_ctx), + BN_MONT_CTX *m_ctx) +{ + int retry_counter = 32; + BN_BLINDING *ret = NULL; + + if (b == NULL) + ret = BN_BLINDING_new(NULL, NULL, m); + else + ret = b; + + if (ret == NULL) + goto err; + + if (ret->A == NULL && (ret->A = BN_new()) == NULL) + goto err; + if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL) + goto err; + + if (e != NULL) { + BN_free(ret->e); + ret->e = BN_dup(e); + } + if (ret->e == NULL) + goto err; + + if (bn_mod_exp != NULL) + ret->bn_mod_exp = bn_mod_exp; + if (m_ctx != NULL) + ret->m_ctx = m_ctx; + + do { + int rv; + if (!BN_rand_range(ret->A, ret->mod)) + goto err; + if (!int_bn_mod_inverse(ret->Ai, ret->A, ret->mod, ctx, &rv)) { + /* + * this should almost never happen for good RSA keys + */ + if (rv) { + if (retry_counter-- == 0) { + BNerr(BN_F_BN_BLINDING_CREATE_PARAM, + BN_R_TOO_MANY_ITERATIONS); + goto err; + } + } else + goto err; + } else + break; + } while (1); + + if (ret->bn_mod_exp != NULL && ret->m_ctx != NULL) { + if (!ret->bn_mod_exp + (ret->A, ret->A, ret->e, ret->mod, ctx, ret->m_ctx)) + goto err; + } else { + if (!BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx)) + goto err; + } + + return ret; + err: + if (b == NULL) { + BN_BLINDING_free(ret); + ret = NULL; + } + + return ret; +} |