using Powershell and IrfanView to rotate and rename all jpg files in the directory of the script

sort_rotate_jpg.ps1

# Declare functions first
# this function reads the "date taken" from extended properties
function Get-DateTaken {
    Param(
        [string]$filePath
    )
    $shell = New-Object -COMObject Shell.Application
    $folder = Split-Path $filePath
    $file = Split-Path $filePath -Leaf
    $shellfolder = $shell.Namespace($folder)
    $shellfile = $shellfolder.ParseName($file)

    $takenDateID = 12
    $takenDate = $shellfolder.GetDetailsOf($shellfile, $takenDateID)

    $asci = [System.Text.Encoding]::ASCII  
    $asciDate = $asci.GetString($asci.GetBytes($takenDate))
    $date= $asciDate -replace '\?'
    $date = [DateTime]::Parse($date); 

    return $date
}

# get current directy 
$curDir = Split-Path -Parent $MyInvocation.MyCommand.Path

# Autorotate and optimize using IrfanView
# Set File CreationDate to Exif Date
# Warning: this may change the Hash of the file
$argList = "$curDir\*.jpg /jpg_rotate=(6,1,1,0,1,300,0,0)"
Start-Process  -Wait -FilePath "${env:ProgramFiles}\IrfanView\i_view32.exe" -ArgumentList $argList

# get a list of jpg files
$jpgFiles = Get-ChildItem $curDir\*.jpg | sort-object -property CreationTime 

# Rename jpg files to Date_Time_Hash.jpg
ForEach ($pic In $jpgFiles){
    $HashString = ((Get-FileHash $pic -Algorithm SHA256).Hash).Remove(4)
    $NeuerName = (Get-DateTaken($pic)).toString("yyyyMMdd_HHmmss") + "_" + $HashString + ".jpg"
	Rename-Item $pic -NewName $NeuerName
}

Use Hash instead of random, to get reproducible results:
http://stackoverflow.com/q/26930090/874701

Get-FileHash -Algorithm SHA256
If no value is specified, or if the parameter is omitted, the default value is SHA256
https://technet.microsoft.com/de-de/library/dn520872.aspx

If IrfanView has not been run, the CreationDate is wrong.
In this case, the function Get-DateTaken is more reliable.
Inspired by: http://www.zold.org/zold/ps_archive_images_takendate/
http://stackoverflow.com/q/9552367/874701

The script as it is will only work from ISE, see
http://stackoverflow.com/a/6040725/874701