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Diffstat (limited to 'src/crypto/bn/cmp.c')
| -rw-r--r-- | src/crypto/bn/cmp.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/src/crypto/bn/cmp.c b/src/crypto/bn/cmp.c new file mode 100644 index 0000000..fce7233 --- /dev/null +++ b/src/crypto/bn/cmp.c @@ -0,0 +1,200 @@ +/* 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 <openssl/bn.h> + +#include "internal.h" + + +int BN_ucmp(const BIGNUM *a, const BIGNUM *b) { + int i; + BN_ULONG t1, t2, *ap, *bp; + + i = a->top - b->top; + if (i != 0) { + return i; + } + + ap = a->d; + bp = b->d; + for (i = a->top - 1; i >= 0; i--) { + t1 = ap[i]; + t2 = bp[i]; + if (t1 != t2) { + return (t1 > t2) ? 1 : -1; + } + } + + return 0; +} + +int BN_cmp(const BIGNUM *a, const BIGNUM *b) { + int i; + int gt, lt; + BN_ULONG t1, t2; + + if ((a == NULL) || (b == NULL)) { + if (a != NULL) { + return -1; + } else if (b != NULL) { + return 1; + } else { + return 0; + } + } + + if (a->neg != b->neg) { + if (a->neg) { + return -1; + } + return 1; + } + if (a->neg == 0) { + gt = 1; + lt = -1; + } else { + gt = -1; + lt = 1; + } + + if (a->top > b->top) { + return gt; + } + if (a->top < b->top) { + return lt; + } + + for (i = a->top - 1; i >= 0; i--) { + t1 = a->d[i]; + t2 = b->d[i]; + if (t1 > t2) { + return gt; + } if (t1 < t2) { + return lt; + } + } + + return 0; +} + +int bn_cmp_words(const BN_ULONG *a, const BN_ULONG *b, int n) { + int i; + BN_ULONG aa, bb; + + aa = a[n - 1]; + bb = b[n - 1]; + if (aa != bb) { + return (aa > bb) ? 1 : -1; + } + + for (i = n - 2; i >= 0; i--) { + aa = a[i]; + bb = b[i]; + if (aa != bb) { + return (aa > bb) ? 1 : -1; + } + } + return 0; +} + +int bn_cmp_part_words(const BN_ULONG *a, const BN_ULONG *b, int cl, int dl) { + int n, i; + n = cl - 1; + + if (dl < 0) { + for (i = dl; i < 0; i++) { + if (b[n - i] != 0) { + return -1; /* a < b */ + } + } + } + if (dl > 0) { + for (i = dl; i > 0; i--) { + if (a[n + i] != 0) { + return 1; /* a > b */ + } + } + } + + return bn_cmp_words(a, b, cl); +} + +int BN_abs_is_word(const BIGNUM *bn, BN_ULONG w) { + switch (bn->top) { + case 1: + return bn->d[0] == w; + case 0: + return w == 0; + default: + return 0; + } +} + +int BN_is_zero(const BIGNUM *bn) { + return bn->top == 0; +} + +int BN_is_one(const BIGNUM *bn) { + return bn->neg == 0 && BN_abs_is_word(bn, 1); +} + +int BN_is_word(const BIGNUM *bn, BN_ULONG w) { + return BN_abs_is_word(bn, w) && (w == 0 || bn->neg == 0); +} + +int BN_is_odd(const BIGNUM *bn) { + return bn->top > 0 && (bn->d[0] & 1) == 1; +} |