diff options
Diffstat (limited to 'freebsd/crypto/openssl/crypto/bn/bn_shift.c')
| -rw-r--r-- | freebsd/crypto/openssl/crypto/bn/bn_shift.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/freebsd/crypto/openssl/crypto/bn/bn_shift.c b/freebsd/crypto/openssl/crypto/bn/bn_shift.c new file mode 100644 index 00000000..ed2980dc --- /dev/null +++ b/freebsd/crypto/openssl/crypto/bn/bn_shift.c @@ -0,0 +1,226 @@ +#include <machine/rtems-bsd-user-space.h> + +/* crypto/bn/bn_shift.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#include <stdio.h> +#include "cryptlib.h" +#include "bn_lcl.h" + +int BN_lshift1(BIGNUM *r, const BIGNUM *a) +{ + register BN_ULONG *ap, *rp, t, c; + int i; + + bn_check_top(r); + bn_check_top(a); + + if (r != a) { + r->neg = a->neg; + if (bn_wexpand(r, a->top + 1) == NULL) + return (0); + r->top = a->top; + } else { + if (bn_wexpand(r, a->top + 1) == NULL) + return (0); + } + ap = a->d; + rp = r->d; + c = 0; + for (i = 0; i < a->top; i++) { + t = *(ap++); + *(rp++) = ((t << 1) | c) & BN_MASK2; + c = (t & BN_TBIT) ? 1 : 0; + } + if (c) { + *rp = 1; + r->top++; + } + bn_check_top(r); + return (1); +} + +int BN_rshift1(BIGNUM *r, const BIGNUM *a) +{ + BN_ULONG *ap, *rp, t, c; + int i, j; + + bn_check_top(r); + bn_check_top(a); + + if (BN_is_zero(a)) { + BN_zero(r); + return (1); + } + i = a->top; + ap = a->d; + j = i - (ap[i - 1] == 1); + if (a != r) { + if (bn_wexpand(r, j) == NULL) + return (0); + r->neg = a->neg; + } + rp = r->d; + t = ap[--i]; + c = (t & 1) ? BN_TBIT : 0; + if (t >>= 1) + rp[i] = t; + while (i > 0) { + t = ap[--i]; + rp[i] = ((t >> 1) & BN_MASK2) | c; + c = (t & 1) ? BN_TBIT : 0; + } + r->top = j; + bn_check_top(r); + return (1); +} + +int BN_lshift(BIGNUM *r, const BIGNUM *a, int n) +{ + int i, nw, lb, rb; + BN_ULONG *t, *f; + BN_ULONG l; + + bn_check_top(r); + bn_check_top(a); + + if (n < 0) { + BNerr(BN_F_BN_LSHIFT, BN_R_INVALID_SHIFT); + return 0; + } + + r->neg = a->neg; + nw = n / BN_BITS2; + if (bn_wexpand(r, a->top + nw + 1) == NULL) + return (0); + lb = n % BN_BITS2; + rb = BN_BITS2 - lb; + f = a->d; + t = r->d; + t[a->top + nw] = 0; + if (lb == 0) + for (i = a->top - 1; i >= 0; i--) + t[nw + i] = f[i]; + else + for (i = a->top - 1; i >= 0; i--) { + l = f[i]; + t[nw + i + 1] |= (l >> rb) & BN_MASK2; + t[nw + i] = (l << lb) & BN_MASK2; + } + memset(t, 0, nw * sizeof(t[0])); + /* + * for (i=0; i<nw; i++) t[i]=0; + */ + r->top = a->top + nw + 1; + bn_correct_top(r); + bn_check_top(r); + return (1); +} + +int BN_rshift(BIGNUM *r, const BIGNUM *a, int n) +{ + int i, j, nw, lb, rb; + BN_ULONG *t, *f; + BN_ULONG l, tmp; + + bn_check_top(r); + bn_check_top(a); + + if (n < 0) { + BNerr(BN_F_BN_RSHIFT, BN_R_INVALID_SHIFT); + return 0; + } + + nw = n / BN_BITS2; + rb = n % BN_BITS2; + lb = BN_BITS2 - rb; + if (nw >= a->top || a->top == 0) { + BN_zero(r); + return (1); + } + i = (BN_num_bits(a) - n + (BN_BITS2 - 1)) / BN_BITS2; + if (r != a) { + r->neg = a->neg; + if (bn_wexpand(r, i) == NULL) + return (0); + } else { + if (n == 0) + return 1; /* or the copying loop will go berserk */ + } + + f = &(a->d[nw]); + t = r->d; + j = a->top - nw; + r->top = i; + + if (rb == 0) { + for (i = j; i != 0; i--) + *(t++) = *(f++); + } else { + l = *(f++); + for (i = j - 1; i != 0; i--) { + tmp = (l >> rb) & BN_MASK2; + l = *(f++); + *(t++) = (tmp | (l << lb)) & BN_MASK2; + } + if ((l = (l >> rb) & BN_MASK2)) + *(t) = l; + } + bn_check_top(r); + return (1); +} |