ref: 6fcd59e9ec30216fa9e46647e9ad1f3fe92be7a7
dir: /libsec/egverify.c/
#include "os.h" #include <mp.h> #include <libsec.h> int egverify(EGpub *pub, EGsig *sig, mpint *m) { mpint *p = pub->p, *alpha = pub->alpha; mpint *r = sig->r, *s = sig->s; mpint *v1, *v2, *rs; int rv = -1; if(mpcmp(r, mpone) < 0 || mpcmp(r, p) >= 0) return rv; v1 = mpnew(0); rs = mpnew(0); v2 = mpnew(0); mpexp(pub->key, r, p, v1); mpexp(r, s, p, rs); mpmul(v1, rs, v1); mpmod(v1, p, v1); mpexp(alpha, m, p, v2); if(mpcmp(v1, v2) == 0) rv = 0; mpfree(v1); mpfree(rs); mpfree(v2); return rv; }