unsigned long long encryptDESplain(unsigned long long plain, unsigned long long *subKeys){

    unsigned long long nova_plain = ip(plain);// primeira permuta (retira bits paridade)
    unsigned long long dir = nova_plain & 0xFFFFFFFF;//comparamos 32 bits
    unsigned long long esq = (nova_plain >>32) & 0xFFFFFFFF;//comparamos os 32 bits da esquerda
    unsigned long long plain_final = 0;
    int j = 0;

    for (j;j<16;j++){
        dir = nova_plain & 0xFFFFFFFF;
        esq = (nova_plain >> 32) & 0xFFFFFFFF;
        esq=esq ^ function_p(function_s(function_e(dir)^subKeys[j]));
        nova_plain = (dir << 32) | esq;
    }
    esq = (nova_plain << 32) &  0xFFFFFFFF00000000;
	dir = (nova_plain >> 32) & 0xFFFFFFFF;
	plain_final= dir | esq;

	return IP1(plain_final);

}