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openssl-1_0_0.29869
0001-crypto-bn-add-more-fixed-top-routines.patch
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File 0001-crypto-bn-add-more-fixed-top-routines.patch of Package openssl-1_0_0.29869
From 387d170b32ceeac450bfa50b81db9db9179dc880 Mon Sep 17 00:00:00 2001 From: Andy Polyakov <appro@openssl.org> Date: Fri, 10 Aug 2018 19:31:22 +0200 Subject: [PATCH 1/4] crypto/bn: add more fixed-top routines. Add bn_mul_fixed_top, bn_from_mont_fixed_top, bn_mod_sub_fixed_top. Switch to bn_{mul|sqr}_fixed_top in bn_mul_mont_fixed_top and remove memset in bn_from_montgomery_word. (cherry picked from commit fcc4ee09473cac511eca90faa003661c7786e4f9) Resolved conflicts: crypto/bn/bn_mod.c crypto/bn_int.h Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/6942) --- crypto/bn/bn_mod.c | 67 ++++++++++++++++++++++++++++++++++++++++++++- crypto/bn/bn_mont.c | 29 +++++++++++++------- crypto/bn/bn_mul.c | 12 +++++++- crypto/bn/bn_sqr.c | 12 +++++++- crypto/bn_int.h | 6 ++++ 5 files changed, 113 insertions(+), 13 deletions(-) diff --git a/crypto/bn/bn_mod.c b/crypto/bn/bn_mod.c index 43da462d93..255e6e4723 100644 --- a/crypto/bn/bn_mod.c +++ b/crypto/bn/bn_mod.c @@ -172,7 +172,7 @@ int bn_mod_add_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, if (mtop > sizeof(storage) / sizeof(storage[0]) && (tp = OPENSSL_malloc(mtop * sizeof(BN_ULONG))) == NULL) - return 0; + return 0; ap = a->d != NULL ? a->d : tp; bp = b->d != NULL ? b->d : tp; @@ -197,6 +197,7 @@ int bn_mod_add_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, ((volatile BN_ULONG *)tp)[i] = 0; } r->top = mtop; + r->flags |= BN_FLG_FIXED_TOP; r->neg = 0; if (tp != storage) @@ -224,6 +225,70 @@ int BN_mod_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m, return BN_nnmod(r, r, m, ctx); } +/* + * BN_mod_sub variant that may be used if both a and b are non-negative, + * a is less than m, while b is of same bit width as m. It's implemented + * as subtraction followed by two conditional additions. + * + * 0 <= a < m + * 0 <= b < 2^w < 2*m + * + * after subtraction + * + * -2*m < r = a - b < m + * + * Thus it takes up to two conditional additions to make |r| positive. + */ +int bn_mod_sub_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, + const BIGNUM *m) +{ + size_t i, ai, bi, mtop = m->top; + BN_ULONG borrow, carry, ta, tb, mask, *rp; + const BN_ULONG *ap, *bp; + + if (bn_wexpand(r, m->top) == NULL) + return 0; + + rp = r->d; + ap = a->d != NULL ? a->d : rp; + bp = b->d != NULL ? b->d : rp; + + for (i = 0, ai = 0, bi = 0, borrow = 0; i < mtop;) { + mask = (BN_ULONG)0 - ((i - a->top) >> (8 * sizeof(i) - 1)); + ta = ap[ai] & mask; + + mask = (BN_ULONG)0 - ((i - b->top) >> (8 * sizeof(i) - 1)); + tb = bp[bi] & mask; + rp[i] = ta - tb - borrow; + if (ta != tb) + borrow = (ta < tb); + + i++; + ai += (i - a->dmax) >> (8 * sizeof(i) - 1); + bi += (i - b->dmax) >> (8 * sizeof(i) - 1); + } + ap = m->d; + for (i = 0, mask = 0 - borrow, carry = 0; i < mtop; i++) { + ta = ((ap[i] & mask) + carry) & BN_MASK2; + carry = (ta < carry); + rp[i] = (rp[i] + ta) & BN_MASK2; + carry += (rp[i] < ta); + } + borrow -= carry; + for (i = 0, mask = 0 - borrow, carry = 0; i < mtop; i++) { + ta = ((ap[i] & mask) + carry) & BN_MASK2; + carry = (ta < carry); + rp[i] = (rp[i] + ta) & BN_MASK2; + carry += (rp[i] < ta); + } + + r->top = mtop; + r->flags |= BN_FLG_FIXED_TOP; + r->neg = 0; + + return 1; +} + /* * BN_mod_sub variant that may be used if both a and b are non-negative and * less than m diff --git a/crypto/bn/bn_mont.c b/crypto/bn/bn_mont.c index d41434a143..76eca50d32 100644 --- a/crypto/bn/bn_mont.c +++ b/crypto/bn/bn_mont.c @@ -164,10 +164,10 @@ int bn_mul_mont_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, bn_check_top(tmp); if (a == b) { - if (!BN_sqr(tmp, a, ctx)) + if (!bn_sqr_fixed_top(tmp, a, ctx)) goto err; } else { - if (!BN_mul(tmp, a, b, ctx)) + if (!bn_mul_fixed_top(tmp, a, b, ctx)) goto err; } /* reduce from aRR to aR */ @@ -190,6 +190,7 @@ static int bn_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont) BIGNUM *n; BN_ULONG *ap, *np, *rp, n0, v, carry; int nl, max, i; + unsigned int rtop; n = &(mont->N); nl = n->top; @@ -207,12 +208,10 @@ static int bn_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont) rp = r->d; /* clear the top words of T */ -# if 1 - for (i = r->top; i < max; i++) /* memset? XXX */ - rp[i] = 0; -# else - memset(&(rp[r->top]), 0, (max - r->top) * sizeof(BN_ULONG)); -# endif + for (rtop = r->top, i = 0; i < max; i++) { + v = (BN_ULONG)0 - ((i - rtop) >> (8 * sizeof(rtop) - 1)); + rp[i] &= v; + } r->top = max; r->flags |= BN_FLG_FIXED_TOP; @@ -262,6 +261,18 @@ static int bn_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont) int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont, BN_CTX *ctx) +{ + int retn; + + retn = bn_from_mont_fixed_top(ret, a, mont, ctx); + bn_correct_top(ret); + bn_check_top(ret); + + return retn; +} + +int bn_from_mont_fixed_top(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont, + BN_CTX *ctx) { int retn = 0; #ifdef MONT_WORD @@ -270,8 +281,6 @@ int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont, BN_CTX_start(ctx); if ((t = BN_CTX_get(ctx)) && BN_copy(t, a)) { retn = bn_from_montgomery_word(ret, t, mont); - bn_correct_top(ret); - bn_check_top(ret); } BN_CTX_end(ctx); #else /* !MONT_WORD */ diff --git a/crypto/bn/bn_mul.c b/crypto/bn/bn_mul.c index 6b455a755f..f44e5e5c1e 100644 --- a/crypto/bn/bn_mul.c +++ b/crypto/bn/bn_mul.c @@ -935,6 +935,16 @@ void bn_mul_high(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, BN_ULONG *l, int n2, #endif /* BN_RECURSION */ int BN_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) +{ + int ret = bn_mul_fixed_top(r, a, b, ctx); + + bn_correct_top(r); + bn_check_top(r); + + return ret; +} + +int bn_mul_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) { int ret = 0; int top, al, bl; @@ -1042,7 +1052,7 @@ int BN_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) #if defined(BN_MUL_COMBA) || defined(BN_RECURSION) end: #endif - bn_correct_top(rr); + rr->flags |= BN_FLG_FIXED_TOP; if (r != rr && BN_copy(r, rr) == NULL) goto err; diff --git a/crypto/bn/bn_sqr.c b/crypto/bn/bn_sqr.c index 5e692971c9..44bc55473f 100644 --- a/crypto/bn/bn_sqr.c +++ b/crypto/bn/bn_sqr.c @@ -65,6 +65,16 @@ * I've just gone over this and it is now %20 faster on x86 - eay - 27 Jun 96 */ int BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) +{ + int ret = bn_sqr_fixed_top(r, a, ctx); + + bn_correct_top(r); + bn_check_top(r); + + return ret; +} + +int bn_sqr_fixed_top(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) { int max, al; int ret = 0; @@ -136,7 +146,7 @@ int BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) rr->neg = 0; rr->top = max; - bn_correct_top(rr); + rr->flags |= BN_FLG_FIXED_TOP; if (r != rr && BN_copy(r, rr) == NULL) goto err; diff --git a/crypto/bn_int.h b/crypto/bn_int.h index 9c42d6f35d..a552cc20be 100644 --- a/crypto/bn_int.h +++ b/crypto/bn_int.h @@ -7,9 +7,15 @@ */ int bn_mul_mont_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, 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_to_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_bn2binpad(const BIGNUM *a, unsigned char *to, int tolen); -- 2.20.1
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