How to pass data from an array to a script?

Question

PowerShell

What I do: I
create a list of files to create variables, to pass them to openssl and symmetric encryption.
The script below works, but it only works if you hardcode the in and out variables, while specifying which line should be used.
Question:
How to make the whole array in variables processed automatically.

$src = Get-ChildItem -r B:\backup\ -include *.xls | Where-Object {$_.LastWriteTime -ge [datetime]::Today.AddHours(-24)}
$in = Get-ChildItem $src | % { $_.fullname } 
$out = Get-ChildItem $src | % { $_.Name }
cd r:\test
$key = "l:\key\key.bin"
& 'C:\Program Files (x86)\OpenSSL\bin\openssl.exe' enc -e -aes-256-cbc -kfile $key -in $in.getvalue(0) -out $out.GetValue(0)

$in:
B:\backup\ Файл1.xls
B:\backup\ Файл2.xls
B:\backup\ Файл3.xls
B:\backup\ Файл4.xls
$out:
Файл1.xls
Файл2.xls
Файл3.xls
Файл4.xls

Answer 1

I think it's here:

$in = Get-ChildItem $src | % { $_.fullname } 
$out = Get-ChildItem $src | % { $_.Name }

don't need get-childitem.
Further. try like this:

$src = Get-ChildItem -r B:\backup\ -include *.xls | Where-Object {$_.LastWriteTime -ge [datetime]::Today.AddHours(-24)}
cd r:\test
$key = "l:\key\key.bin"
foreach($item in $src){
& 'C:\Program Files (x86)\OpenSSL\bin\openssl.exe' enc -e -aes-256-cbc -kfile $key -in $item.fullname -out $item.name
}

Answer 2

Thank you for the direction, partially done.
Problem:
Foreach can only handle 1 ($in in $ins), also need to change second $out variable, but forceach doesn't support pipeline...
ForEach ($ins In $in) {& 'R:\test\OpenSSL\bin \openssl.exe' enc -e -aes-256-cbc -kfile $key -in $ins -out $out}