/* test-curve25519 version 20050915 D. J. Bernstein Public domain. Tiny modifications by agl */ #include <stdio.h> extern void curve25519_donna(unsigned char *output, const unsigned char *a, const unsigned char *b); void doit(unsigned char *ek,unsigned char *e,unsigned char *k); void doit(unsigned char *ek,unsigned char *e,unsigned char *k) { int i; for (i = 0;i < 32;++i) printf("%02x",(unsigned int) e[i]); printf(" "); for (i = 0;i < 32;++i) printf("%02x",(unsigned int) k[i]); printf(" "); curve25519_donna(ek,e,k); for (i = 0;i < 32;++i) printf("%02x",(unsigned int) ek[i]); printf("\n"); } unsigned char e1k[32]; unsigned char e2k[32]; unsigned char e1e2k[32]; unsigned char e2e1k[32]; unsigned char e1[32] = {3}; unsigned char e2[32] = {5}; unsigned char k[32] = {9}; int main() { int loop; int i; for (loop = 0;loop < 10000;++loop) { doit(e1k,e1,k); doit(e2e1k,e2,e1k); doit(e2k,e2,k); doit(e1e2k,e1,e2k); for (i = 0;i < 32;++i) if (e1e2k[i] != e2e1k[i]) { printf("fail\n"); return 1; } for (i = 0;i < 32;++i) e1[i] ^= e2k[i]; for (i = 0;i < 32;++i) e2[i] ^= e1k[i]; for (i = 0;i < 32;++i) k[i] ^= e1e2k[i]; } return 0; }