Method: OpenSSL::BN#to_s

Defined in:
ossl_bn.c

#to_s(base = 10) ⇒ String

Returns the string representation of the bignum.

BN.new can parse the encoded string to convert back into an OpenSSL::BN.

base

The format. Must be one of the following:

  • 0 - MPI format. See the man page BN_bn2mpi(3) for details.

  • 2 - Variable-length and big-endian binary encoding. The sign of the bignum is ignored.

  • 10 - Decimal number representation, with a leading ‘-’ for a negative bignum.

  • 16 - Hexadeciaml number representation, with a leading ‘-’ for a negative bignum.

Returns:

  • (String) 


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# File 'ossl_bn.c', line 332

static VALUE
ossl_bn_to_s(int argc, VALUE *argv, VALUE self)
{
    BIGNUM *bn;
    VALUE str, bs;
    int base = 10, len;
    char *buf;

    if (rb_scan_args(argc, argv, "01", &bs) == 1) {
  base = NUM2INT(bs);
    }
    GetBN(self, bn);
    switch (base) {
    case 0:
  len = BN_bn2mpi(bn, NULL);
        str = rb_str_new(0, len);
  if (BN_bn2mpi(bn, (unsigned char *)RSTRING_PTR(str)) != len)
      ossl_raise(eBNError, NULL);
  break;
    case 2:
  len = BN_num_bytes(bn);
        str = rb_str_new(0, len);
  if (BN_bn2bin(bn, (unsigned char *)RSTRING_PTR(str)) != len)
      ossl_raise(eBNError, NULL);
  break;
    case 10:
  if (!(buf = BN_bn2dec(bn))) ossl_raise(eBNError, NULL);
  str = ossl_buf2str(buf, rb_long2int(strlen(buf)));
  break;
    case 16:
  if (!(buf = BN_bn2hex(bn))) ossl_raise(eBNError, NULL);
  str = ossl_buf2str(buf, rb_long2int(strlen(buf)));
  break;
    default:
  ossl_raise(rb_eArgError, "invalid radix %d", base);
    }

    return str;
}