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If p is set to 1 when calling BN_GF2m_mod_inv then an infinite loop will result. Calling this function set 1 when applications call this directly is a non-sensical value - so this would be considered a bug in the caller. It does not seem possible to cause OpenSSL internal callers of BN_GF2m_mod_inv to call it with a value of 1. So, for the above reasons, this is not considered a security issue. Reported by Bing Shi. Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Todd Short <todd.short@me.com> (Merged from https://github.com/openssl/openssl/pull/22960) |
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.. | ||
asm | ||
bn_add.c | ||
bn_asm.c | ||
bn_blind.c | ||
bn_const.c | ||
bn_conv.c | ||
bn_ctx.c | ||
bn_depr.c | ||
bn_dh.c | ||
bn_div.c | ||
bn_err.c | ||
bn_exp2.c | ||
bn_exp.c | ||
bn_gcd.c | ||
bn_gf2m.c | ||
bn_intern.c | ||
bn_kron.c | ||
bn_lib.c | ||
bn_local.h | ||
bn_mod.c | ||
bn_mont.c | ||
bn_mpi.c | ||
bn_mul.c | ||
bn_nist.c | ||
bn_ppc.c | ||
bn_prime.c | ||
bn_prime.h | ||
bn_prime.pl | ||
bn_print.c | ||
bn_rand.c | ||
bn_recp.c | ||
bn_rsa_fips186_4.c | ||
bn_s390x.c | ||
bn_shift.c | ||
bn_sparc.c | ||
bn_sqr.c | ||
bn_sqrt.c | ||
bn_srp.c | ||
bn_word.c | ||
bn_x931p.c | ||
build.info | ||
README.pod | ||
rsaz_exp_x2.c | ||
rsaz_exp.c | ||
rsaz_exp.h |
=pod =head1 NAME bn_mul_words, bn_mul_add_words, bn_sqr_words, bn_div_words, bn_add_words, bn_sub_words, bn_mul_comba4, bn_mul_comba8, bn_sqr_comba4, bn_sqr_comba8, bn_cmp_words, bn_mul_normal, bn_mul_low_normal, bn_mul_recursive, bn_mul_part_recursive, bn_mul_low_recursive, bn_sqr_normal, bn_sqr_recursive, bn_expand, bn_wexpand, bn_expand2, bn_fix_top, bn_check_top, bn_print, bn_dump, bn_set_max, bn_set_high, bn_set_low - BIGNUM library internal functions =head1 SYNOPSIS #include <openssl/bn.h> BN_ULONG bn_mul_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w); BN_ULONG bn_mul_add_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w); void bn_sqr_words(BN_ULONG *rp, BN_ULONG *ap, int num); BN_ULONG bn_div_words(BN_ULONG h, BN_ULONG l, BN_ULONG d); BN_ULONG bn_add_words(BN_ULONG *rp, BN_ULONG *ap, BN_ULONG *bp, int num); BN_ULONG bn_sub_words(BN_ULONG *rp, BN_ULONG *ap, BN_ULONG *bp, int num); void bn_mul_comba4(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b); void bn_mul_comba8(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b); void bn_sqr_comba4(BN_ULONG *r, BN_ULONG *a); void bn_sqr_comba8(BN_ULONG *r, BN_ULONG *a); int bn_cmp_words(BN_ULONG *a, BN_ULONG *b, int n); void bn_mul_normal(BN_ULONG *r, BN_ULONG *a, int na, BN_ULONG *b, int nb); void bn_mul_low_normal(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n); void bn_mul_recursive(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n2, int dna, int dnb, BN_ULONG *tmp); void bn_mul_part_recursive(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n, int tna, int tnb, BN_ULONG *tmp); void bn_mul_low_recursive(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n2, BN_ULONG *tmp); void bn_sqr_normal(BN_ULONG *r, BN_ULONG *a, int n, BN_ULONG *tmp); void bn_sqr_recursive(BN_ULONG *r, BN_ULONG *a, int n2, BN_ULONG *tmp); void mul(BN_ULONG r, BN_ULONG a, BN_ULONG w, BN_ULONG c); void mul_add(BN_ULONG r, BN_ULONG a, BN_ULONG w, BN_ULONG c); void sqr(BN_ULONG r0, BN_ULONG r1, BN_ULONG a); BIGNUM *bn_expand(BIGNUM *a, int bits); BIGNUM *bn_wexpand(BIGNUM *a, int n); BIGNUM *bn_expand2(BIGNUM *a, int n); void bn_fix_top(BIGNUM *a); void bn_check_top(BIGNUM *a); void bn_print(BIGNUM *a); void bn_dump(BN_ULONG *d, int n); void bn_set_max(BIGNUM *a); void bn_set_high(BIGNUM *r, BIGNUM *a, int n); void bn_set_low(BIGNUM *r, BIGNUM *a, int n); =head1 DESCRIPTION This page documents the internal functions used by the OpenSSL B<BIGNUM> implementation. They are described here to facilitate debugging and extending the library. They are I<not> to be used by applications. =head2 The BIGNUM structure typedef struct bignum_st BIGNUM; struct bignum_st { BN_ULONG *d; /* Pointer to an array of 'BN_BITS2' bit chunks. */ int top; /* Index of last used d +1. */ /* The next are internal book keeping for bn_expand. */ int dmax; /* Size of the d array. */ int neg; /* one if the number is negative */ int flags; }; The integer value is stored in B<d>, a malloc()ed array of words (B<BN_ULONG>), least significant word first. A B<BN_ULONG> can be either 16, 32 or 64 bits in size, depending on the 'number of bits' (B<BITS2>) specified in C<openssl/bn.h>. B<dmax> is the size of the B<d> array that has been allocated. B<top> is the number of words being used, so for a value of 4, bn.d[0]=4 and bn.top=1. B<neg> is 1 if the number is negative. When a B<BIGNUM> is B<0>, the B<d> field can be B<NULL> and B<top> == B<0>. B<flags> is a bit field of flags which are defined in C<openssl/bn.h>. The flags begin with B<BN_FLG_>. The macros BN_set_flags(b, n) and BN_get_flags(b, n) exist to enable or fetch flag(s) B<n> from B<BIGNUM> structure B<b>. Various routines in this library require the use of temporary B<BIGNUM> variables during their execution. Since dynamic memory allocation to create B<BIGNUM>s is rather expensive when used in conjunction with repeated subroutine calls, the B<BN_CTX> structure is used. This structure contains B<BN_CTX_NUM> B<BIGNUM>s, see L<BN_CTX_start(3)>. =head2 Low-level arithmetic operations These functions are implemented in C and for several platforms in assembly language: bn_mul_words(B<rp>, B<ap>, B<num>, B<w>) operates on the B<num> word arrays B<rp> and B<ap>. It computes B<ap> * B<w>, places the result in B<rp>, and returns the high word (carry). bn_mul_add_words(B<rp>, B<ap>, B<num>, B<w>) operates on the B<num> word arrays B<rp> and B<ap>. It computes B<ap> * B<w> + B<rp>, places the result in B<rp>, and returns the high word (carry). bn_sqr_words(B<rp>, B<ap>, B<n>) operates on the B<num> word array B<ap> and the 2*B<num> word array B<ap>. It computes B<ap> * B<ap> word-wise, and places the low and high bytes of the result in B<rp>. bn_div_words(B<h>, B<l>, B<d>) divides the two word number (B<h>, B<l>) by B<d> and returns the result. bn_add_words(B<rp>, B<ap>, B<bp>, B<num>) operates on the B<num> word arrays B<ap>, B<bp> and B<rp>. It computes B<ap> + B<bp>, places the result in B<rp>, and returns the high word (carry). bn_sub_words(B<rp>, B<ap>, B<bp>, B<num>) operates on the B<num> word arrays B<ap>, B<bp> and B<rp>. It computes B<ap> - B<bp>, places the result in B<rp>, and returns the carry (1 if B<bp> E<gt> B<ap>, 0 otherwise). bn_mul_comba4(B<r>, B<a>, B<b>) operates on the 4 word arrays B<a> and B<b> and the 8 word array B<r>. It computes B<a>*B<b> and places the result in B<r>. bn_mul_comba8(B<r>, B<a>, B<b>) operates on the 8 word arrays B<a> and B<b> and the 16 word array B<r>. It computes B<a>*B<b> and places the result in B<r>. bn_sqr_comba4(B<r>, B<a>, B<b>) operates on the 4 word arrays B<a> and B<b> and the 8 word array B<r>. bn_sqr_comba8(B<r>, B<a>, B<b>) operates on the 8 word arrays B<a> and B<b> and the 16 word array B<r>. The following functions are implemented in C: bn_cmp_words(B<a>, B<b>, B<n>) operates on the B<n> word arrays B<a> and B<b>. It returns 1, 0 and -1 if B<a> is greater than, equal and less than B<b>. bn_mul_normal(B<r>, B<a>, B<na>, B<b>, B<nb>) operates on the B<na> word array B<a>, the B<nb> word array B<b> and the B<na>+B<nb> word array B<r>. It computes B<a>*B<b> and places the result in B<r>. bn_mul_low_normal(B<r>, B<a>, B<b>, B<n>) operates on the B<n> word arrays B<r>, B<a> and B<b>. It computes the B<n> low words of B<a>*B<b> and places the result in B<r>. bn_mul_recursive(B<r>, B<a>, B<b>, B<n2>, B<dna>, B<dnb>, B<t>) operates on the word arrays B<a> and B<b> of length B<n2>+B<dna> and B<n2>+B<dnb> (B<dna> and B<dnb> are currently allowed to be 0 or negative) and the 2*B<n2> word arrays B<r> and B<t>. B<n2> must be a power of 2. It computes B<a>*B<b> and places the result in B<r>. bn_mul_part_recursive(B<r>, B<a>, B<b>, B<n>, B<tna>, B<tnb>, B<tmp>) operates on the word arrays B<a> and B<b> of length B<n>+B<tna> and B<n>+B<tnb> and the 4*B<n> word arrays B<r> and B<tmp>. bn_mul_low_recursive(B<r>, B<a>, B<b>, B<n2>, B<tmp>) operates on the B<n2> word arrays B<r> and B<tmp> and the B<n2>/2 word arrays B<a> and B<b>. BN_mul() calls bn_mul_normal(), or an optimized implementation if the factors have the same size: bn_mul_comba8() is used if they are 8 words long, bn_mul_recursive() if they are larger than B<BN_MULL_SIZE_NORMAL> and the size is an exact multiple of the word size, and bn_mul_part_recursive() for others that are larger than B<BN_MULL_SIZE_NORMAL>. bn_sqr_normal(B<r>, B<a>, B<n>, B<tmp>) operates on the B<n> word array B<a> and the 2*B<n> word arrays B<tmp> and B<r>. The implementations use the following macros which, depending on the architecture, may use "long long" C operations or inline assembler. They are defined in C<bn_local.h>. mul(B<r>, B<a>, B<w>, B<c>) computes B<w>*B<a>+B<c> and places the low word of the result in B<r> and the high word in B<c>. mul_add(B<r>, B<a>, B<w>, B<c>) computes B<w>*B<a>+B<r>+B<c> and places the low word of the result in B<r> and the high word in B<c>. sqr(B<r0>, B<r1>, B<a>) computes B<a>*B<a> and places the low word of the result in B<r0> and the high word in B<r1>. =head2 Size changes bn_expand() ensures that B<b> has enough space for a B<bits> bit number. bn_wexpand() ensures that B<b> has enough space for an B<n> word number. If the number has to be expanded, both macros call bn_expand2(), which allocates a new B<d> array and copies the data. They return B<NULL> on error, B<b> otherwise. The bn_fix_top() macro reduces B<a-E<gt>top> to point to the most significant non-zero word plus one when B<a> has shrunk. =head2 Debugging bn_check_top() verifies that C<((a)-E<gt>top E<gt>= 0 && (a)-E<gt>top E<lt>= (a)-E<gt>dmax)>. A violation will cause the program to abort. bn_print() prints B<a> to stderr. bn_dump() prints B<n> words at B<d> (in reverse order, i.e. most significant word first) to stderr. bn_set_max() makes B<a> a static number with a B<dmax> of its current size. This is used by bn_set_low() and bn_set_high() to make B<r> a read-only B<BIGNUM> that contains the B<n> low or high words of B<a>. If B<BN_DEBUG> is not defined, bn_check_top(), bn_print(), bn_dump() and bn_set_max() are defined as empty macros. =head1 SEE ALSO L<bn(3)> =head1 COPYRIGHT Copyright 2000-2016 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 L<https://www.openssl.org/source/license.html>. =cut