Information om filer vha. sha1
Jeg bruger dette til at få sha1 informationen om filer.Men ved filer på f.eks. 2GB så får jeg fejl: Out of memory, fordi filen er for stor (større end antal RAM til rådighed):
Det er funktionen: Function GetBytes(sPath)
Linje: .LoadFromFile sPath
Er det muligt at undgå at fejl får denne fejl?
sha1 = bytesToHex(sha1hashBytes((GetBytes(sPath))))
function md5hashBytes(aBytes)
Dim MD5
set MD5 = CreateObject("System.Security.Cryptography.MD5CryptoServiceProvider")
MD5.Initialize()
'Note you MUST use computehash_2 to get the correct version of this method, and the bytes MUST be double wrapped in brackets to ensure they get passed in correctly.
md5hashBytes = MD5.ComputeHash_2( (aBytes) )
end function
function sha1hashBytes(aBytes)
Dim sha1
set sha1 = CreateObject("System.Security.Cryptography.SHA1Managed")
sha1.Initialize()
'Note you MUST use computehash_2 to get the correct version of this method, and the bytes MUST be double wrapped in brackets to ensure they get passed in correctly.
sha1hashBytes = sha1.ComputeHash_2( (aBytes) )
end function
function sha256hashBytes(aBytes)
Dim sha256
set sha256 = CreateObject("System.Security.Cryptography.SHA256Managed")
sha256.Initialize()
'Note you MUST use computehash_2 to get the correct version of this method, and the bytes MUST be double wrapped in brackets to ensure they get passed in correctly.
sha256hashBytes = sha256.ComputeHash_2( (aBytes) )
end function
function stringToUTFBytes(aString)
Dim UTF8
Set UTF8 = CreateObject("System.Text.UTF8Encoding")
stringToUTFBytes = UTF8.GetBytes_4(aString)
end function
function bytesToHex(aBytes)
dim hexStr, x
for x=1 to lenb(aBytes)
hexStr= hex(ascb(midb( (aBytes),x,1)))
if len(hexStr)=1 then hexStr="0" & hexStr
bytesToHex=bytesToHex & hexStr
next
end function
Function BytesToBase64(varBytes)
With CreateObject("MSXML2.DomDocument").CreateElement("b64")
.dataType = "bin.base64"
.nodeTypedValue = varBytes
BytesToBase64 = .Text
End With
End Function
Function GetBytes(sPath)
With CreateObject("Adodb.Stream")
.Type = 1 ' adTypeBinary
.Open
.LoadFromFile sPath
.Position = 0
GetBytes = .Read
.Close
End With
End Function