eddsa_decode_point
ret = eddsa_decode_point(&R, &crv_edwards, alpha_edwards, &sig[0],
ret = eddsa_decode_point(&R, &crv_edwards, alpha_edwards, &sig[0],
ret = eddsa_decode_point(&R, &crv_edwards, alpha_edwards, &sig[0],
ret = eddsa_decode_point(&_Tmp, &edwards_curve, alpha_edwards, buf, buflen,