Private/Get-HMACValue.ps1
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# Copyright: (c) 2018, Jordan Borean (@jborean93) <jborean93@gmail.com> # MIT License (see LICENSE or https://opensource.org/licenses/MIT) Function Get-HMACValue { <# .SYNOPSIS Generates the HMAC hex string of a byte array. .DESCRIPTION Generates the HMAC hex string of a byte array using the SHA256 algorithm and the Key specified. .PARAMETER Value [byte[]] The byte array to compute the hash from. .PARAMETER Key [byte[]] The key to use as part of the HMAC function. .OUTPUTS [String] The hex string of the HMAC output. .EXAMPLE Get-HMACValue -Value $bytes -Key $key .NOTES This is locked in to use the SHA256 algorithm, in the future this may change and be configurable but right now Ansible Vault only uses this. #> [CmdletBinding()] [OutputType([byte[]])] param( [Parameter(Mandatory=$true)] [byte[]]$Value, [Parameter(Mandatory=$true)] [byte[]]$Key ) $hmac_sha256 = New-Object -TypeName System.Security.Cryptography.HMACSHA256 -ArgumentList @(,$Key) $actual_hmac = $hmac_sha256.ComputeHash($Value) $actual_hmac_hex = Convert-ByteToHex -Value $actual_hmac return $actual_hmac_hex } |