Powershell Base64 Decode to bytes hex

Question

i'm trying to get the hex binary (\x**) of a base64 decode result from the Local State of chrome.

When i decode the base64 of my encrypted key using

[System.Convert]::FromBase64String($local_state.os_crypt.encrypted_key)

I get an byte array, but not hex, what i want is something like base64.b64decode("BASE64_ENCODED_STRING") from the base64 module of python I don't know how to achieve this result in powershell, so if anyone could help, i would apreciate :)

My current :

$local_state=Get-Content -Path "$($env:LOCALAPPDATA)\\Google\\Chrome\\User Data\\Local State" | ConvertFrom-Json
[System.Convert]::FromBase64String($local_state.os_crypt.encrypted_key)

Exemple of difference between powershell and python: Python output : b'\x01\x00\x01' Powershell Output : 01 00 01

Answer 1

Using the ConvertFrom-SecureString cmdlet:

$SecureString = Read-Host -AsSecureString
$Hex = $SecureString | ConvertFrom-SecureString

Default (hexadcimal) output

$Hex
01000000d08c9ddf0115d1118c7a00c04fc297eb01000000da4b9d0c09bdb140b3060606f3557e12000000000200000000001066000000010000200000003e5e7e364bba09ff85c69e5ab52d6503c9782f2e6fb280e6d5259adb194d5872000000000e8000000002000020000000fbaff7af38d8a7fa03283907bd428a0160ab0e17748eaef159767f3dac4699c310000000700931ab89b21c663e2d8c55eb62328d40000000883276253b23475ea08afacaba679cc97cfb17a16c8155bcc4f1d4210ebcc7506c4e1d94b94aa18d9454c9795ce4e857a063267027c36f1c8ae1ba64da3d1863

Not sure wherefore you need this format:

$Hex -replace '..', '\x$&'
\x01\x00\x00\x00\xd0\x8c\x9d\xdf\x01\x15\xd1\x11\x8c\x7a\x00\xc0\x4f\xc2\x97\xeb\x01\x00\x00\x00\xda\x4b\x9d\x0c\x09\xbd\xb1\x40\xb3\x06\x06\x06\xf3\x55\x7e\x12\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x10\x66\x00\x00\x00\x01\x00\x00\x20\x00\x00\x00\x79\x5d\x5a\x40\xed\xde\xc7\xea\xad\x34\xe3\x95\x05\x9b\x6c\x62\xc9\x0f\x46\xa9\xe3\xb2\x8f\x44\xe1\x05\xe4\xd2\xe1\x53\x82\xad\x00\x00\x00\x00\x0e\x80\x00\x00\x00\x02\x00\x00\x20\x00\x00\x00\x9f\x46\x73\x15\x59\x55\x4b\xd6\x49\xc8\x7f\x65\xc6\x65\xf5\x46\xc8\x82\xc7\x2b\x1f\xc0\xac\x85\x09\x29\x57\x53\x0a\xde\x1c\x03\x10\x00\x00\x00\x57\x73\xd9\xfc\xe1\xe0\x00\x63\x33\xcf\x8d\xf1\xd0\xad\xb7\xf0\x40\x00\x00\x00\x8d\x54\x05\xae\x06\x15\x25\x74\xfd\x5c\xf6\x6e\xb3\xce\xf0\xa7\xd6\x32\x6b\xb5\x18\xe8\xd1\x85\xf1\xf2\x45\x13\x8e\xbc\x15\x38\x84\x14\xb1\xdb\x89\x9c\x74\xb2\xa1\xf6\xf8\x48\x1f\x61\x5f\x26\xe9\x2c\x78\x2d\xeb\x3c\x81\x1b\x74\x77\x2a\x5d\x31\x80\x20\xb4

Actual Bytes

$Bytes = [byte[]] -split ($Hex -replace '..', '0x$& ')
"$Bytes"
1 0 0 0 208 140 157 223 1 21 209 17 140 122 0 192 79 194 151 235 1 0 0 0 218 75 157 12 9 189 177 64 179 6 6 6 243 85 126 18 0 0 0 0 2 0 0 0 0 0 16 102 0 0 0 1 0 0 32 0 0 0 121 93 90 64 237 222 199 234 173 52 227 149 5 155 108 98 201 15 70 169 227 178 143 68 225 5 228 210 225 83 130 173 0 0 0 0 14 128 0 0 0 2 0 0 32 0 0 0 159 70 115 21 89 85 75 214 73 200 127 101 198 101 245 70 200 130 199 43 31 192 172 133 9 41 87 83 10 222 28 3 16 0 0 0 87 115 217 252 225 224 0 99 51 207 141 241 208 173 183 240 64 0 0 0 141 84 5 174 6 21 37 116 253 92 246 110 179 206 240 167 214 50 107 181 24 232 209 133 241 242 69 19 142 188 21 56 132 20 177 219 137 156 116 178 161 246 248 72 31 97 95 38 233 44 120 45 235 60 129 27 116 119 42 93 49 128 32 180

Base64

[Convert]::ToBase64String($Bytes)
AQAAANCMnd8BFdERjHoAwE/Cl+sBAAAA2kudDAm9sUCzBgYG81V+EgAAAAACAAAAAAAQZgAAAAEAACAAAAB5XVpA7d7H6q0045UFm2xiyQ9GqeOyj0ThBeTS4VOCrQAAAAAOgAAAAAIAACAAAACfRnMVWVVL1knIf2XGZfVGyILHKx/ArIUJKVdTCt4cAxAAAABXc9n84eAAYzPPjfHQrbfwQAAAAI1UBa4GFSV0/Vz2brPO8KfWMmu1GOjRhfHyRROOvBU4hBSx24mcdLKh9vhIH2FfJukseC3rPIEbdHcqXTGAILQ=

Round trip

$Base64 = <your base64> # e.g.: 'AQAAANCMnd8BFdERjHoAwE/Cl+sBAAAA2kudDAm9sUCzBgYG81V+EgAAAAACAAAAAAAQZgAAAAEAACAAAAB5XVpA7d7H6q0045UFm2xiyQ9GqeOyj0ThBeTS4VOCrQAAAAAOgAAAAAIAACAAAACfRnMVWVVL1knIf2XGZfVGyILHKx/ArIUJKVdTCt4cAxAAAABXc9n84eAAYzPPjfHQrbfwQAAAAI1UBa4GFSV0/Vz2brPO8KfWMmu1GOjRhfHyRROOvBU4hBSx24mcdLKh9vhIH2FfJukseC3rPIEbdHcqXTGAILQ='
$Bytes = [System.Convert]::FromBase64String($Base64)
$Hex = -Join $Bytes.Foreach{ $_.ToString('x2') }
$SecureString = $Hex | ConvertTo-SecureString
$SecureString | ConvertFrom-SecureString -AsPlainText

Related: #19948 Convert*-SecureString cmdlets enhancements