else if(!strcmp(*argv, "-oaep")) pad = RSA_PKCS1_OAEP_PADDING;
else if(!strcmp(*argv, "-ssl")) pad = RSA_SSLV23_PADDING;
else if(!strcmp(*argv, "-pkcs")) pad = RSA_PKCS1_PADDING;
+ else if(!strcmp(*argv, "-x931")) pad = RSA_X931_PADDING;
else if(!strcmp(*argv, "-sign")) {
rsa_mode = RSA_SIGN;
need_priv = 1;