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bignum-fuzz/CVE-2016-1938-nss-mp_exptmod.c
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| /* Example code for bug CVE-2016-1938 in mp_exptmod() | |
| * author: Hanno Böck, license: CC0 / public domain | |
| * | |
| * This shows that a bug in the mp_div() function of nss can also produce wrong results | |
| * in mp_exptmod(). | |
| * Two calculations are compared: Directly calling mp_exptmod() and calling mp_expt() | |
| * and mp_mod() separately. A correct implementation should always produce the same | |
| * result. | |
| */ | |
| #define MP_IOFUNC 1 | |
| #include <mpi/mpi.h> | |
| #define MI "0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0EED0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F0F7C000000000000000000000000000000000000000000000000000000000000000000000000000000000000" | |
| #define AI "80" | |
| #define BI "fc" | |
| int main() | |
| { | |
| mp_int an, bn, mn, r1, r2, xn; | |
| mp_init(&an); | |
| mp_init(&bn); | |
| mp_init(&mn); | |
| mp_init(&r1); | |
| mp_init(&xn); | |
| mp_init(&r2); | |
| mp_read_radix(&an, AI, 16); | |
| mp_read_radix(&bn, BI, 16); | |
| mp_read_radix(&mn, MI, 16); | |
| mp_exptmod(&an, &bn, &mn, &r2); | |
| mp_expt(&an, &bn, &xn); | |
| mp_mod(&xn, &mn, &r1); | |
| mp_print(&r1, stdout); | |
| printf("\n"); | |
| mp_print(&r2, stdout); | |
| printf("\n"); | |
| if (mp_cmp(&r1, &r2) != 0) | |
| printf("results don't match\n"); | |
| else | |
| printf("results match\n"); | |
| mp_clear(&an); | |
| mp_clear(&bn); | |
| mp_clear(&mn); | |
| mp_clear(&r1); | |
| mp_clear(&r2); | |
| mp_clear(&xn); | |
| return 0; | |
| } |