Libgmp-dev Bignum C Class
09.04.2020by admin
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Bignum Library
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- Both C and C bindings are present in this package. Package libstdc-dev is required to use the C bindings. The MPFR library (multiple-precision floating-point) used to be included, but has since been moved to package libmpfr-dev.
- Sep 30, 2019 The section presents source code of the BigNumber class. Declarations Contents of the header file (xsamplebignum.h) declaring the BigNumber class are presented below.
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levitteDeprecate ERR_get_state()e5d4233Sep 12, 2019
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| /* |
| * Copyright 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 may obtain a copy of the License at |
| * https://www.openssl.org/source/license.html |
| * or in the file LICENSE in the source distribution. |
| */ |
| /* |
| * Confirm that a^b mod c agrees when calculated cleverly vs naively, for |
| * random a, b and c. |
| */ |
| #include<stdio.h> |
| #include<openssl/bn.h> |
| #include<openssl/err.h> |
| #include'fuzzer.h' |
| intFuzzerInitialize(int *argc, char ***argv) |
| { |
| OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL); |
| ERR_clear_error(); |
| return1; |
| } |
| intFuzzerTestOneInput(constuint8_t *buf, size_t len) |
| { |
| int success = 0; |
| size_t l1 = 0, l2 = 0, l3 = 0; |
| int s1 = 0, s3 = 0; |
| BN_CTX *ctx; |
| BIGNUM *b1; |
| BIGNUM *b2; |
| BIGNUM *b3; |
| BIGNUM *b4; |
| BIGNUM *b5; |
| b1 = BN_new(); |
| b2 = BN_new(); |
| b3 = BN_new(); |
| b4 = BN_new(); |
| b5 = BN_new(); |
| ctx = BN_CTX_new(); |
| /* Divide the input into three parts, using the values of the first two |
| * bytes to choose lengths, which generate b1, b2 and b3. Use three bits |
| * of the third byte to choose signs for the three numbers. |
| */ |
| if (len > 2) { |
| len -= 3; |
| l1 = (buf[0] * len) / 255; |
| ++buf; |
| l2 = (buf[0] * (len - l1)) / 255; |
| ++buf; |
| l3 = len - l1 - l2; |
| s1 = buf[0] & 1; |
| s3 = buf[0] & 4; |
| ++buf; |
| } |
| OPENSSL_assert(BN_bin2bn(buf, l1, b1) b1); |
| BN_set_negative(b1, s1); |
| OPENSSL_assert(BN_bin2bn(buf + l1, l2, b2) b2); |
| OPENSSL_assert(BN_bin2bn(buf + l1 + l2, l3, b3) b3); |
| BN_set_negative(b3, s3); |
| /* mod 0 is undefined */ |
| if (BN_is_zero(b3)) { |
| success = 1; |
| goto done; |
| } |
| OPENSSL_assert(BN_mod_exp(b4, b1, b2, b3, ctx)); |
| OPENSSL_assert(BN_mod_exp_simple(b5, b1, b2, b3, ctx)); |
| success = BN_cmp(b4, b5) 0; |
| if (!success) { |
| BN_print_fp(stdout, b1); |
| putchar('n'); |
| BN_print_fp(stdout, b2); |
| putchar('n'); |
| BN_print_fp(stdout, b3); |
| putchar('n'); |
| BN_print_fp(stdout, b4); |
| putchar('n'); |
| BN_print_fp(stdout, b5); |
| putchar('n'); |
| } |
| done: |
| OPENSSL_assert(success); |
| BN_free(b1); |
| BN_free(b2); |
| BN_free(b3); |
| BN_free(b4); |
| BN_free(b5); |
| BN_CTX_free(ctx); |
| ERR_clear_error(); |
| return0; |
| } |
| voidFuzzerCleanup(void) |
| { |
| } |
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