API -> CryptSignHash [ Library : advapi32.dll, Category : Security ] [C#, VB, VB.net]

CryptSignHash

Library : advapi32.dll Category : Security

Api Example(s)
Create and verify digital signature to detect data tampering.

API Description :

The CryptSignHash function is used to sign a piece of data. Because all signature algorithms are asymmetric and thus incredibly slow, CryptoAPI will not let data be signed directly. Instead, you must first hash the data and then use CryptSignHash to sign

VB Declaration :

Show Multiline Public Private

Declare Function CryptSignHash Lib "advapi32.dll" Alias "CryptSignHashA" (ByVal hHash As Long, ByVal dwKeySpec As Long, ByVal sDescription As String, ByVal dwFlags As Long, ByVal pbSignature As String, pdwSigLen As Long) As Long

Parameters :

· hHash
[in] A handle to the hash object to be signed.

· dwKeySpec
[in] The key pair to use to sign the hash. The following keys can be specified:
 ·  AT_KEYEXCHANGE ¾ Exchange private key
 ·  AT_SIGNATURE ¾ Signature private key
The signature alg

Return :

If the function succeeds, the return value is nonzero. 

If the function fails, the return value is zero. To retrieve extended error information, use the GetLastError function. 

The following table lists the error codes most commonly returned by the

OS Requirement :

Windows NT 4.0 or later
Windows 95 OSR2 or later (or Windows 95 with Internet Explorer 3.02 or later)

Dotnet Replacement :