How to convert a string to a stream object in Powershell?

Question

I want to make a string fit for consumption as a stream, by e.g. Get-FileHash command (using its -InputStream parameter).

The reason I want this is that I need to digest a string, and not contents of a file. I do not want to temporarily store said string in a file just to digest it.

I know this can be done with some half a dozen .NET objects, which is trivially supported by Powershell, but I am just curious whether there is an existing PS command or combination thereof that turns a string object into a stream, so I can do something like the following (assuming the hypothetical Convert turns the string into a stream)?

Get-FileHash -InputStream (Convert "Quick brown fox jumps over the lazy dog.") -Algorithm SHA512

Get-FileHash -InputStream ([IO.MemoryStream]::new([Text.Encoding]::UTF8.GetBytes("Quick brown fox jumps over the lazy dog."))) -Algorithm SHA512 — user4003407
– user4003407, Commented Jan 18, 2018 at 14:08

Paweł Dyl · Accepted Answer · 2018-01-18 14:08:27Z

13

You can use some .NET functions:

$stream = [IO.MemoryStream]::new([Text.Encoding]::UTF8.GetBytes("Quick brown fox jumps over the lazy dog."))
Get-FileHash -InputStream $stream -Algorithm SHA512

answered Jan 18, 2018 at 14:08

Paweł Dyl

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Jeff Zeitlin · Accepted Answer · 2018-01-18 13:59:36Z

1

There is a script in the Microsoft Script Gallery that does exactly what you ultimately want to do - that is, it takes a string and returns the hash for the string. See Get-StringHash in the Technet Powershell Script Gallery.

answered Jan 18, 2018 at 13:59

Jeff Zeitlin

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