Function b64nltohex

b64nltohex(s): string
convert a Base64 encoded string with new lines to a hexadecimal string
Parameters
- s: string
  Base64 encoded string with new lines
Returns string
hexadecimal string
Description
This function converts from a Base64 encoded string with new lines to a hexadecimal string. This is useful to handle PEM encoded file. This function removes any non-Base64 characters (i.e. not 0-9,A-Z,a-z,,+,=) including new line.

Example
```
hextob64nl(
"MTIzNDU2Nzg5MDEyMzQ1Njc4OTAxMjM0NTY3ODkwMTIzNDU2Nzg5MDEyMzQ1Njc4\r\n" +
"OTAxMjM0NTY3ODkwCg==\r\n")
->
"123456789012345678901234567890123456789012345678901234567890"
```
- Defined in conv_pem.mts:133