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Diffstat (limited to 'src/crypto/bn/bn.c')
-rw-r--r-- | src/crypto/bn/bn.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/src/crypto/bn/bn.c b/src/crypto/bn/bn.c new file mode 100644 index 0000000..368c4f1 --- /dev/null +++ b/src/crypto/bn/bn.c @@ -0,0 +1,338 @@ +/* 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 <limits.h> +#include <string.h> + +#include <openssl/err.h> +#include <openssl/mem.h> + +#include "internal.h" + + +BIGNUM *BN_new(void) { + BIGNUM *bn = OPENSSL_malloc(sizeof(BIGNUM)); + + if (bn == NULL) { + OPENSSL_PUT_ERROR(BN, BN_new, ERR_R_MALLOC_FAILURE); + return NULL; + } + + memset(bn, 0, sizeof(BIGNUM)); + bn->flags = BN_FLG_MALLOCED; + + return bn; +} + +void BN_init(BIGNUM *bn) { + memset(bn, 0, sizeof(BIGNUM)); +} + +void BN_free(BIGNUM *bn) { + if (bn == NULL) { + return; + } + + if (bn->d != NULL && (bn->flags & BN_FLG_STATIC_DATA) == 0) { + OPENSSL_free(bn->d); + } + + if (bn->flags & BN_FLG_MALLOCED) { + OPENSSL_free(bn); + } else { + bn->d = NULL; + } +} + +void BN_clear_free(BIGNUM *bn) { + char should_free; + + if (bn == NULL) { + return; + } + + if (bn->d != NULL) { + OPENSSL_cleanse(bn->d, bn->dmax * sizeof(bn->d[0])); + if ((bn->flags & BN_FLG_STATIC_DATA) == 0) { + OPENSSL_free(bn->d); + } + } + + should_free = (bn->flags & BN_FLG_MALLOCED) != 0; + OPENSSL_cleanse(bn, sizeof(BIGNUM)); + if (should_free) { + OPENSSL_free(bn); + } +} + +BIGNUM *BN_dup(const BIGNUM *src) { + BIGNUM *copy; + + if (src == NULL) { + return NULL; + } + + copy = BN_new(); + if (copy == NULL) { + return NULL; + } + + if (!BN_copy(copy, src)) { + BN_free(copy); + return NULL; + } + + return copy; +} + +BIGNUM *BN_copy(BIGNUM *dest, const BIGNUM *src) { + if (src == dest) { + return dest; + } + + if (bn_wexpand(dest, src->top) == NULL) { + return NULL; + } + + memcpy(dest->d, src->d, sizeof(src->d[0]) * src->top); + + dest->top = src->top; + dest->neg = src->neg; + return dest; +} + +void BN_clear(BIGNUM *bn) { + if (bn->d != NULL) { + memset(bn->d, 0, bn->dmax * sizeof(bn->d[0])); + } + + bn->top = 0; + bn->neg = 0; +} + +const BIGNUM *BN_value_one(void) { + static const BN_ULONG data_one = 1; + static const BIGNUM const_one = {(BN_ULONG *)&data_one, 1, 1, 0, + BN_FLG_STATIC_DATA}; + + return &const_one; +} + +void BN_with_flags(BIGNUM *out, const BIGNUM *in, int flags) { + memcpy(out, in, sizeof(BIGNUM)); + out->flags &= ~BN_FLG_MALLOCED; + out->flags |= BN_FLG_STATIC_DATA | flags; +} + +/* BN_num_bits_word returns the minimum number of bits needed to represent the + * value in |l|. */ +unsigned BN_num_bits_word(BN_ULONG l) { + static const unsigned char bits[256] = { + 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8}; + +#if defined(OPENSSL_64_BIT) + if (l & 0xffffffff00000000L) { + if (l & 0xffff000000000000L) { + if (l & 0xff00000000000000L) { + return (bits[(int)(l >> 56)] + 56); + } else + return (bits[(int)(l >> 48)] + 48); + } else { + if (l & 0x0000ff0000000000L) { + return (bits[(int)(l >> 40)] + 40); + } else + return (bits[(int)(l >> 32)] + 32); + } + } else +#endif + { + if (l & 0xffff0000L) { + if (l & 0xff000000L) { + return (bits[(int)(l >> 24L)] + 24); + } else { + return (bits[(int)(l >> 16L)] + 16); + } + } else { + if (l & 0xff00L) { + return (bits[(int)(l >> 8)] + 8); + } else { + return (bits[(int)(l)]); + } + } + } +} + +unsigned BN_num_bits(const BIGNUM *bn) { + const int max = bn->top - 1; + + if (BN_is_zero(bn)) { + return 0; + } + + return max*BN_BITS2 + BN_num_bits_word(bn->d[max]); +} + +unsigned BN_num_bytes(const BIGNUM *bn) { + return (BN_num_bits(bn) + 7) / 8; +} + +void BN_zero(BIGNUM *bn) { + bn->top = bn->neg = 0; +} + +int BN_one(BIGNUM *bn) { + return BN_set_word(bn, 1); +} + +int BN_set_word(BIGNUM *bn, BN_ULONG value) { + if (value == 0) { + BN_zero(bn); + return 1; + } + + if (bn_wexpand(bn, 1) == NULL) { + return 0; + } + + bn->neg = 0; + bn->d[0] = value; + bn->top = 1; + return 1; +} + +int BN_is_negative(const BIGNUM *bn) { + return bn->neg != 0; +} + +void BN_set_negative(BIGNUM *bn, int sign) { + if (sign && !BN_is_zero(bn)) { + bn->neg = 1; + } else { + bn->neg = 0; + } +} + +BIGNUM *bn_wexpand(BIGNUM *bn, unsigned words) { + BN_ULONG *a; + + if (words <= (unsigned) bn->dmax) { + return bn; + } + + if (words > (INT_MAX / (4 * BN_BITS2))) { + OPENSSL_PUT_ERROR(BN, bn_wexpand, BN_R_BIGNUM_TOO_LONG); + return NULL; + } + + if (bn->flags & BN_FLG_STATIC_DATA) { + OPENSSL_PUT_ERROR(BN, bn_wexpand, BN_R_EXPAND_ON_STATIC_BIGNUM_DATA); + return NULL; + } + + a = (BN_ULONG *)OPENSSL_malloc(sizeof(BN_ULONG) * words); + if (a == NULL) { + OPENSSL_PUT_ERROR(BN, bn_wexpand, ERR_R_MALLOC_FAILURE); + return NULL; + } + + memcpy(a, bn->d, sizeof(BN_ULONG) * bn->top); + + if (bn->d) { + OPENSSL_free(bn->d); + } + bn->d = a; + bn->dmax = words; + + return bn; +} + +BIGNUM *bn_expand(BIGNUM *bn, unsigned bits) { + return bn_wexpand(bn, (bits+BN_BITS2-1)/BN_BITS2); +} + +void bn_correct_top(BIGNUM *bn) { + BN_ULONG *ftl; + int tmp_top = bn->top; + + if (tmp_top > 0) { + for (ftl = &(bn->d[tmp_top - 1]); tmp_top > 0; tmp_top--) { + if (*(ftl--)) { + break; + } + } + bn->top = tmp_top; + } +} + +int BN_get_flags(const BIGNUM *bn, int flags) { + return bn->flags & flags; +} + +void BN_set_flags(BIGNUM *bn, int flags) { + bn->flags |= flags; +} |