48 lines
2.2 KiB
QBasic
48 lines
2.2 KiB
QBasic
Private Declare PtrSafe Function CryptAcquireContext Lib "advapi32.dll" Alias "CryptAcquireContextA" (ByRef phProv As LongPtr, ByVal pszContainer As String, ByVal pszProvider As String, ByVal dwProvType As Long, ByVal dwFlags As Long) As Long
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Private Declare PtrSafe Function CryptCreateHash Lib "advapi32.dll" (ByVal hProv As LongPtr, ByVal Algid As Long, ByVal hKey As LongPtr, ByVal dwFlags As Long, ByRef phHash As LongPtr) As Long
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Private Declare PtrSafe Function CryptHashData Lib "advapi32.dll" (ByVal hHash As LongPtr, ByVal pbData As String, ByVal dwDataLen As Long, ByVal dwFlags As Long) As Long
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Private Declare PtrSafe Function CryptGetHashParam Lib "advapi32.dll" (ByVal hHash As LongPtr, ByVal dwParam As Long, pbData As Any, pdwDataLen As Long, ByVal dwFlags As Long) As Long
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Private Declare PtrSafe Function CryptDestroyHash Lib "advapi32.dll" (ByVal hHash As LongPtr) As Long
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Private Declare PtrSafe Function CryptReleaseContext Lib "advapi32.dll" (ByVal hProv As LongPtr, ByVal dwFlags As Long) As Long
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Private Const PROV_RSA_FULL As Long = 1
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Private Const ALG_CLASS_HASH As Long = 4 * 2 ^ 13
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Private Const ALG_TYPE_ANY As Long = 0
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Private Const ALG_SID_MD5 As Long = 3
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Private Const ALGID_MD5 As Long = (ALG_CLASS_HASH Or ALG_TYPE_ANY Or ALG_SID_MD5)
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Private Const HP_HASHVAL As Long = 2
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Public Function MD5(ByVal s As String) As String
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Dim hProv As LongPtr
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Dim hHash As LongPtr
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Dim b() As Byte
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Dim l As Long
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Dim i As Long
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If CryptAcquireContext(hProv, vbNullString, vbNullString, PROV_RSA_FULL, 0) = 0 Then
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Err.Raise Err.LastDllError, , "CryptAcquireContext failed"
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End If
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If CryptCreateHash(hProv, ALGID_MD5, 0, 0, hHash) = 0 Then
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Err.Raise Err.LastDllError, , "CryptCreateHash failed"
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End If
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If CryptHashData(hHash, s, Len(s), 0) = 0 Then
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Err.Raise Err.LastDllError, , "CryptHashData failed"
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End If
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l = 16
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ReDim b(0 To l - 1)
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If CryptGetHashParam(hHash, HP_HASHVAL, b(0), l, 0) = 0 Then
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Err.Raise Err.LastDllError, , "CryptGetHashParam failed"
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End If
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MD5 = ""
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For i = 0 To l - 1
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MD5 = MD5 & Right$("0" & Hex(b(i)), 2)
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Next
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CryptDestroyHash hHash
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CryptReleaseContext hProv, 0
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End Function
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