PBKDF2作为Excel中的一个功能

问题描述 投票：1回答：1

我已经设法在Excel中使用SHA256哈希但是正在寻找更安全的东西，我在这里遇到了PBKDF2哈希生成：PBKDF2 Excel UDF and how to concatenate INT(i)但是解决方案中的代码没有运行：

编译错误：未定义用户定义的类型

突出显示以下内容：

Function HMAC(ByVal plainText As String, _
    ByVal algoritm As hmacAlgorithm, _
    Optional ByVal key As String, _
    Optional ByVal decodeKey As keyDecoding = kdNone_String, _
    Optional ByVal encodeHash As hashEncoding = heBase64) As Variant

我最终希望有一个类似于SHA256的函数我有= SHA256hash（A2）和PBKDF2键长，盐和迭代作为选项= PBKDF2（A2,512，saltysalt，5000）例如，这对团队来说这是一件简单的事情众所周知，实施起来越困难，人们就越不可能这样做。

上述链接上的代码是：

枚举

Enum hmacAlgorithm
    HMAC_MD5
    HMAC_SHA1
    HMAC_SHA256
    HMAC_SHA384
    HMAC_SHA512
End Enum

Enum hashEncoding
    heBase64
    heHex
    heNone_Bytes
End Enum

PBKDF2功能

Function PBKDF2(ByVal password As String, _
    ByVal salt As String, _
    ByVal hashIterations As Long, _
    ByVal algoritm As hmacAlgorithm, _
    Optional ByVal dkLen As Long, _
    Optional ByVal encodeHash As hashEncoding = heBase64) As Variant

'https://tools.ietf.org/html/rfc2898 - PKCS #5: Password-Based Cryptography Specification Version 2.0
'https://tools.ietf.org/html/rfc6070 - PKCS #5: Password-Based Key Derivation Function 2 (PBKDF2) Test Vectors
'https://en.wikipedia.org/wiki/PBKDF2

'DK = T1 || T2 || ... || Tdklen/hlen
'Ti = F(password, salt, c, i)
'
'F(Password, Salt, c, i) = U1 ^ U2 ^ ... ^ Uc
'
'U_1 = PRF (P, S || INT (i)) (INT (i) is a four-octet encoding of the integer i, most significant octet first.)
'U_2 = PRF (P, U_1)
'...
'U_c = PRF (P, U_{c-1})

Dim utf8Encoding As Object
Dim hashManager As Object

Dim hLen As Long
Dim noBlocks As Long
Dim noBlock As Long

Dim hmacKeyBytes() As Byte
Dim saltBytes() As Byte
Dim uboundSaltBytes As Long

Dim hmacBytes() As Byte
Dim tempBytes() As Byte
Dim outputBytes() As Byte

Dim i As Long
Dim j As Long

'Create utf8-encoding object
Set utf8Encoding = CreateObject("System.Text.UTF8Encoding")

'Create hmac object
Select Case algoritm
    Case HMAC_MD5
        Set hashManager = CreateObject("System.Security.Cryptography.HMACMD5")
    Case HMAC_SHA1
        Set hashManager = CreateObject("System.Security.Cryptography.HMACSHA1")
    Case HMAC_SHA256
        Set hashManager = CreateObject("System.Security.Cryptography.HMACSHA256")
    Case HMAC_SHA384
        Set hashManager = CreateObject("System.Security.Cryptography.HMACSHA384")
    Case HMAC_SHA512
        Set hashManager = CreateObject("System.Security.Cryptography.HMACSHA512")
End Select

'Check the length of the blocks to be generated
hLen = hashManager.HashSize / 8

'Calculate amount of blocks 'T'
If dkLen = 0 Then dkLen = hLen
noBlocks = Application.WorksheetFunction.Ceiling(dkLen / hLen, 1)

'Encode the key and salt to bytes
hmacKeyBytes = utf8Encoding.GetBytes_4(password)
saltBytes = utf8Encoding.GetBytes_4(salt)

'Set the key in the crypto class
hashManager.key = hmacKeyBytes

'Get the length of the salt, add 4 to concatenate INT(I)
uboundSaltBytes = UBound(saltBytes) + 4

'Loop T1 || T2 || ... || Tdklen/hlen
For i = 1 To noBlocks

    'Salt || INT(i)
    'INT (i) is a four-octet encoding of the integer i, most significant octet first.
    tempBytes = saltBytes
    ReDim Preserve tempBytes(uboundSaltBytes)
    noBlock = i

    'Calculate INT(i) of Salt || INT(i)
    For j = 3 To 0 Step -1
        tempBytes(uboundSaltBytes - j) = Int(noBlock / (255 ^ j))
        noBlock = noBlock - Int(noBlock / (255 ^ j)) * 255 ^ j
    Next j

    'Hash U1: Salt || INT(i)
    hmacBytes = hashManager.ComputeHash_2(tempBytes)
    tempBytes = hmacBytes

    'Hash, Xor: U1 ^ U2 ^ ... ^ Uc
    For j = 1 To hashIterations - 1
        hmacBytes = hashManager.ComputeHash_2(hmacBytes)
        tempBytes = XorBytes(tempBytes, hmacBytes)
    Next j

    'For the first block outputBytes() is empty
    If i = 1 Then
        outputBytes = tempBytes
    Else
        ConcatenateArrayInPlace outputBytes, tempBytes
    End If

Next i

'Extract the first dkLen octets to produce a derived key DK:
ReDim Preserve outputBytes(dkLen - 1)

'Base64, Hex, or Byte() output
If encodeHash = heBase64 Then
    PBKDF2 = Encode(outputBytes, edBase64)
ElseIf encodeHash = heHex Then
    PBKDF2 = Encode(outputBytes, edHex)
Else
    PBKDF2 = outputBytes
End If

Set hashManager = Nothing
Set utf8Encoding = Nothing

End Function

HMAC功能

Function HMAC(ByVal plainText As String, _
    ByVal algoritm As hmacAlgorithm, _
    Optional ByVal key As String, _
    Optional ByVal decodeKey As keyDecoding = kdNone_String, _
    Optional ByVal encodeHash As hashEncoding = heBase64) As Variant

Dim hashManager As Object

Dim hashBytes() As Byte
Dim hmacKeyBytes() As Byte

'Create the specific hash manager based on the hash algoritm
Select Case algoritm
    Case HMAC_MD5
        Set hashManager = CreateObject("System.Security.Cryptography.HMACMD5") 'Returns 128 bits, 16 bytes
    Case HMAC_SHA1
        Set hashManager = CreateObject("System.Security.Cryptography.HMACSHA1") 'Returns 160 bits, 20 bytes
    Case HMAC_SHA256
        Set hashManager = CreateObject("System.Security.Cryptography.HMACSHA256") 'Returns 256 bits, 32 bytes
    Case HMAC_SHA384
        Set hashManager = CreateObject("System.Security.Cryptography.HMACSHA384") 'Returns 384 bits, 48 bytes
    Case HMAC_SHA512
        Set hashManager = CreateObject("System.Security.Cryptography.HMACSHA512") 'Returns 512 bits, 64 bytes
End Select

'Encode the plaintText to bytes
hashBytes = UTF8_GetBytes(plainText)

If key = vbNullString Then

    'Get the key generated by the hashManager
    hmacKeyBytes = hashManager.key

    'Calculate the hash
    hashBytes = hashManager.ComputeHash_2(hashBytes)

    'Return encoded result
    If encodeHash = heBase64 Then
        HMAC = "<Key>" & Encode(hmacKeyBytes, edBase64) & "<Key>" & vbCrLf & Encode(hashBytes, edBase64)
    ElseIf encodeHash = heHex Then
        HMAC = "<Key>" & Encode(hmacKeyBytes, edHex) & "<Key>" & vbCrLf & Encode(hashBytes, edHex)
    End If

Else

    'Decode and set the key
    Select Case decodeKey
    Case kdBase64
        hashManager.key = Decode(key, edBase64)
    Case kdHex
        hashManager.key = Decode(key, edHex)
    Case Else
        hashManager.key = UTF8_GetBytes(key)
    End Select

    'Calculate the hash
    hashBytes = hashManager.ComputeHash_2(hashBytes)

    'Return encoded result
    If encodeHash = heBase64 Then
        HMAC = Encode(hashBytes, edBase64)
    ElseIf encodeHash = heHex Then
        HMAC = Encode(hashBytes, edHex)
    End If

End If

Set hashManager = Nothing

End Function

测试子程序：

Sub PBKDF2_Test()

Dim testvector As String
Dim pbkdf2_result As String

pbkdf2_result = PBKDF2("password", "salt", 1, HMAC_SHA1, 20, heHex)
testvector = "0c60c80f961f0e71f3a9b524af6012062fe037a6"
If pbkdf2_result = testvector Then Debug.Print "TV1: OK" Else Debug.Print "TV1: FAULT"

pbkdf2_result = PBKDF2("password", "salt", 2, HMAC_SHA1, 20, heHex)
testvector = "ea6c014dc72d6f8ccd1ed92ace1d41f0d8de8957"
If pbkdf2_result = testvector Then Debug.Print "TV2: OK" Else Debug.Print "TV2: FAULT"

pbkdf2_result = PBKDF2("password", "salt", 4096, HMAC_SHA1, 20, heHex)
testvector = "4b007901b765489abead49d926f721d065a429c1"
If pbkdf2_result = testvector Then Debug.Print "TV3: OK" Else Debug.Print "TV3: FAULT"

pbkdf2_result = PBKDF2("passwordPASSWORDpassword", "saltSALTsaltSALTsaltSALTsaltSALTsalt", 4096, HMAC_SHA1, 25, heHex)
testvector = "3d2eec4fe41c849b80c8d83662c0e44a8b291a964cf2f07038"
If pbkdf2_result = testvector Then Debug.Print "TV4: OK" Else Debug.Print "TV4: FAULT"

End Sub

任何帮助将不胜感激。谷歌搜索没有太多关于在Excel中使用PBKDF2。

excel vba pbkdf2
1个回答
1
投票

HMAC函数中的这一部分缺少一些枚举定义：

Select Case decodeKey
Case kdBase64
    hashManager.key = Decode(key, edBase64)
Case kdHex
    hashManager.key = Decode(key, edHex)
Case Else
    hashManager.key = UTF8_GetBytes(key)
End Select

decodeKey在你的函数签名中声明，类型为keyDecoding，我认为它是枚举：

Optional ByVal decodeKey As keyDecoding = kdNone_String

这就是给你的错误，这个keyDecoding枚举没有在任何地方定义。然而，它看起来只有3个成员，所以你可以自己推出。

Decode和Encode函数同时采用edBase64和edHex成员的一些枚举。这个枚举也没有在任何地方定义（虽然这不是给你错误的东西，但这是我提到的第一点）。

你还没有包括这两个功能，所以我不能说更多，但我想他们的签名会告诉你你的第二个缺失枚举的名称是什么。代码可能存在其他问题，但这正是我所关注的问题。确保你已经正确地从源代码复制了:)

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