1. vb 怎么获取文件MD5
Option Explicit
Private Declare Function CryptAcquireContext Lib "advapi32.dll" _
Alias "CryptAcquireContextA" ( _
ByRef phProv As Long, _
ByVal pszContainer As String, _
ByVal pszProvider As String, _
ByVal dwProvType As Long, _
ByVal dwFlags As Long) As Long
Private Declare Function CryptReleaseContext Lib "advapi32.dll" ( _
ByVal hProv As Long, _
ByVal dwFlags As Long) As Long
Private Declare Function CryptCreateHash Lib "advapi32.dll" ( _
ByVal hProv As Long, _
ByVal Algid As Long, _
ByVal hKey As Long, _
ByVal dwFlags As Long, _
ByRef phHash As Long) As Long
Private Declare Function CryptDestroyHash Lib "advapi32.dll" ( _
ByVal hHash As Long) As Long
Private Declare Function CryptHashData Lib "advapi32.dll" ( _
ByVal hHash As Long, _
pbData As Any, _
ByVal dwDataLen As Long, _
ByVal dwFlags As Long) As Long
Private Declare Function CryptGetHashParam Lib "advapi32.dll" ( _
ByVal hHash As Long, _
ByVal dwParam As Long, _
pbData As Any, _
pdwDataLen As Long, _
ByVal dwFlags As Long) As Long
Private Const PROV_RSA_FULL = 1
Private Const CRYPT_NEWKEYSET = &H8
Private Const ALG_CLASS_HASH = 32768
Private Const ALG_TYPE_ANY = 0
Private Const ALG_SID_MD2 = 1
Private Const ALG_SID_MD4 = 2
Private Const ALG_SID_MD5 = 3
Private Const ALG_SID_SHA1 = 4
Enum HashAlgorithm
MD2 = ALG_CLASS_HASH Or ALG_TYPE_ANY Or ALG_SID_MD2
MD4 = ALG_CLASS_HASH Or ALG_TYPE_ANY Or ALG_SID_MD4
MD5 = ALG_CLASS_HASH Or ALG_TYPE_ANY Or ALG_SID_MD5
SHA1 = ALG_CLASS_HASH Or ALG_TYPE_ANY Or ALG_SID_SHA1
End Enum
Private Const HP_HASHVAL = 2
Private Const HP_HASHSIZE = 4
Function HashFile( _
ByVal FileName As String, _
Optional ByVal Algorithm As HashAlgorithm = MD5) As String
Dim hCtx As Long
Dim hHash As Long
Dim lFile As Long
Dim lRes As Long
Dim lLen As Long
Dim lIdx As Long
Dim abHash() As Byte
If Len(Dir$(FileName)) = 0 Then Err.Raise 53
lRes = CryptAcquireContext(hCtx, vbNullString, _
vbNullString, PROV_RSA_FULL, 0)
If lRes = 0 And Err.LastDllError = &H80090016 Then
lRes = CryptAcquireContext(hCtx, vbNullString, _
vbNullString, PROV_RSA_FULL, CRYPT_NEWKEYSET)
End If
If lRes <> 0 Then
lRes = CryptCreateHash(hCtx, Algorithm, 0, 0, hHash)
If lRes <> 0 Then
lFile = FreeFile
Open FileName For Binary As lFile
If Err.Number = 0 Then
Const BLOCK_SIZE As Long = 32 * 1024& ' 32K
ReDim abBlock(1 To BLOCK_SIZE) As Byte
Dim lCount As Long
Dim lBlocks As Long
Dim lLastBlock As Long
lBlocks = LOF(lFile) \ BLOCK_SIZE
lLastBlock = LOF(lFile) - lBlocks * BLOCK_SIZE
For lCount = 1 To lBlocks
Get lFile, , abBlock
lRes = CryptHashData(hHash, abBlock(1), BLOCK_SIZE, 0)
If lRes = 0 Then Exit For
Next
If lLastBlock > 0 And lRes <> 0 Then
ReDim abBlock(1 To lLastBlock) As Byte
Get lFile, , abBlock
lRes = CryptHashData(hHash, abBlock(1), lLastBlock, 0)
End If
Close lFile
End If
If lRes <> 0 Then
lRes = CryptGetHashParam(hHash, HP_HASHSIZE, lLen, 4, 0)
If lRes <> 0 Then
ReDim abHash(0 To lLen - 1)
lRes = CryptGetHashParam(hHash, HP_HASHVAL, abHash(0), lLen, 0)
If lRes <> 0 Then
For lIdx = 0 To UBound(abHash)
HashFile = HashFile & _
Right$("0" & Hex$(abHash(lIdx)), 2)
Next
End If
End If
End If
CryptDestroyHash hHash
End If
End If
CryptReleaseContext hCtx, 0
If lRes = 0 Then Err.Raise Err.LastDllError
End Function
调用测试：
Private Sub Form_Load()
MsgBox HashFile("C:\windows\explorer.exe")
End Sub
2. md5_file — 计算指定文件的 MD5 散列值
总结后的知识希望能帮到你：
函数名：md5_file
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
md5_file — 计算指定文件的 MD5 散列值
说明
md5_file ( string $filename , bool $raw_output = false ) : string
使用 » RSA 数据安全公司的 MD5 报文算法计算 filename 文件的 MD5 散列值并返回。该散列值为 32 字符的十六进制数字。
参数
filename
文件名
raw_output
如果被设置为 true，那么报文摘要将以原始的 16 位二进制格式返回。
返回值
成功返回字符串，否则返回 false。
更新日志
版本 说明
5.1.0 函数改用流 API。这意味着能够配合封装器使用该函数，比如 md5_file('http://example.com/..')。
范例
示例 #1 md5_file() 使用范例
3. Nodejs怎么获取上传文件的MD5
可以使用第三方的js库，比如spark-md5.js。上传文件后，调用对应的api即可以获取到上传文件的md5。
4. java有提供获取一个压缩文件的MD5验证码的API吗
JAVA 的MD5加耐答密算法源代码
import java.security.*;
import java.security.spec.*;
class MD5_Test{
public final static String MD5(String s){
char hexDigits[] = {
'0', '1', '2', '3', '4', '5'慧旦, '6', '7', '8', '9', 'a', 'b', '昌碧慧c', 'd',
'e', 'f'};
try {
byte[] strTemp = s.getBytes();
MessageDigest mdTemp = MessageDigest.getInstance("MD5");
mdTemp.update(strTemp);
byte[] md = mdTemp.digest();
int j = md.length;
char str[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte byte0 = md[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
return new String(str);
}
catch (Exception e){
return null;
}
}
public static void main(String[] args){
//MD5_Test aa = new MD5_Test();
System.out.print(MD5_Test.MD5("XX"));
}