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Diffstat (limited to 'include/crypto/bn.h')
| -rw-r--r-- | include/crypto/bn.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/include/crypto/bn.h b/include/crypto/bn.h new file mode 100644 index 00000000..cf69bea8 --- /dev/null +++ b/include/crypto/bn.h @@ -0,0 +1,117 @@ +/* + * Copyright 2014-2021 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the Apache License 2.0 (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 + */ + +#ifndef OSSL_CRYPTO_BN_H +# define OSSL_CRYPTO_BN_H +# pragma once + +# include <openssl/bn.h> +# include <limits.h> + +BIGNUM *bn_wexpand(BIGNUM *a, int words); +BIGNUM *bn_expand2(BIGNUM *a, int words); + +void bn_correct_top(BIGNUM *a); + +/* + * Determine the modified width-(w+1) Non-Adjacent Form (wNAF) of 'scalar'. + * This is an array r[] of values that are either zero or odd with an + * absolute value less than 2^w satisfying scalar = \sum_j r[j]*2^j where at + * most one of any w+1 consecutive digits is non-zero with the exception that + * the most significant digit may be only w-1 zeros away from that next + * non-zero digit. + */ +signed char *bn_compute_wNAF(const BIGNUM *scalar, int w, size_t *ret_len); + +int bn_get_top(const BIGNUM *a); + +int bn_get_dmax(const BIGNUM *a); + +/* Set all words to zero */ +void bn_set_all_zero(BIGNUM *a); + +/* + * Copy the internal BIGNUM words into out which holds size elements (and size + * must be bigger than top) + */ +int bn_copy_words(BN_ULONG *out, const BIGNUM *in, int size); + +BN_ULONG *bn_get_words(const BIGNUM *a); + +/* + * Set the internal data words in a to point to words which contains size + * elements. The BN_FLG_STATIC_DATA flag is set + */ +void bn_set_static_words(BIGNUM *a, const BN_ULONG *words, int size); + +/* + * Copy words into the BIGNUM |a|, reallocating space as necessary. + * The negative flag of |a| is not modified. + * Returns 1 on success and 0 on failure. + */ +/* + * |num_words| is int because bn_expand2 takes an int. This is an internal + * function so we simply trust callers not to pass negative values. + */ +int bn_set_words(BIGNUM *a, const BN_ULONG *words, int num_words); + +/* + * Some BIGNUM functions assume most significant limb to be non-zero, which + * is customarily arranged by bn_correct_top. Output from below functions + * is not processed with bn_correct_top, and for this reason it may not be + * returned out of public API. It may only be passed internally into other + * functions known to support non-minimal or zero-padded BIGNUMs. Even + * though the goal is to facilitate constant-time-ness, not each subroutine + * is constant-time by itself. They all have pre-conditions, consult source + * code... + */ +int bn_mul_mont_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, + BN_MONT_CTX *mont, BN_CTX *ctx); +int bn_to_mont_fixed_top(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont, + BN_CTX *ctx); +int bn_from_mont_fixed_top(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont, + BN_CTX *ctx); +int bn_mod_add_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, + const BIGNUM *m); +int bn_mod_sub_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, + const BIGNUM *m); +int bn_mul_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx); +int bn_sqr_fixed_top(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx); +int bn_lshift_fixed_top(BIGNUM *r, const BIGNUM *a, int n); +int bn_rshift_fixed_top(BIGNUM *r, const BIGNUM *a, int n); +int bn_div_fixed_top(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m, + const BIGNUM *d, BN_CTX *ctx); + +#define BN_PRIMETEST_COMPOSITE 0 +#define BN_PRIMETEST_COMPOSITE_WITH_FACTOR 1 +#define BN_PRIMETEST_COMPOSITE_NOT_POWER_OF_PRIME 2 +#define BN_PRIMETEST_PROBABLY_PRIME 3 + +int ossl_bn_miller_rabin_is_prime(const BIGNUM *w, int iterations, BN_CTX *ctx, + BN_GENCB *cb, int enhanced, int *status); + +const BIGNUM *ossl_bn_get0_small_factors(void); + +int ossl_bn_rsa_fips186_4_gen_prob_primes(BIGNUM *p, BIGNUM *Xpout, + BIGNUM *p1, BIGNUM *p2, + const BIGNUM *Xp, const BIGNUM *Xp1, + const BIGNUM *Xp2, int nlen, + const BIGNUM *e, BN_CTX *ctx, + BN_GENCB *cb); + +int ossl_bn_rsa_fips186_4_derive_prime(BIGNUM *Y, BIGNUM *X, const BIGNUM *Xin, + const BIGNUM *r1, const BIGNUM *r2, + int nlen, const BIGNUM *e, BN_CTX *ctx, + BN_GENCB *cb); + +OSSL_LIB_CTX *ossl_bn_get_libctx(BN_CTX *ctx); + +extern const BIGNUM ossl_bn_inv_sqrt_2; + +#endif |