Sig.VerifyData Method

Verify a signature value over data in a byte array.

Syntax

public static int VerifyData(
   string sigStr,
   byte[] data,
   string certOrKeyFile,
   SigAlgorithm sigAlg,
   Sig.VerifyOpts opts = Sig.VerifyOpts.Default 
)

Public Shared Function VerifyData (
   sigStr As String,
   data As Byte(),
   certOrKeyFile As String,
   sigAlg As SigAlgorithm,
   Optional opts As Sig.VerifyOpts = Sig.VerifyOpts.Default 
) As Integer

Parameters

sigStr  String

Encoded signature value

data  Byte

Input data to be verified

certOrKeyFile  String

The X.509 certificate or public key file name (or a string containing the certificate or key in PEM format or base64 representation, or an internal key string).

sigAlg  SigAlgorithm

Signature algorithm used to create signature.

opts  Sig.VerifyOpts  (Optional)

(optional) Advanced options for RSA-PSS only.

Return Value

Remarks

Example

string certFile = "AliceRSASignByCarl.cer"; // Used to verify signature
// Signed data: a byte array with ASCII string "abc"
byte[] b = System.Text.Encoding.Default.GetBytes("abc");
string sig = // Alice/'abc'/SHA-1
"YK1aePtKQDDsVCyJdM0V9VOE6DZVTO3ZoyLV9BNcYmep0glwxU5mUQcLAUTUOETImTIN2Pp4Gffr" +
"xqdxUoczLshnXBNhg7P4ofge+WlBgmcTCnVv27LHHZpmdEbjTg6tnPMb+2b4FvMZ0LfkMKXyiRVTmG4A" +
"NyAmHH6QIsDZ8R8=";
int n = Sig.VerifyData(sig, b, certFile, SigAlgorithm.Default);
Console.WriteLine("Sig.VerifyData returns " + n + " (expecting 0)");
Debug.Assert(0 == n, "Sig.VerifyData failed");

See Also

VB6/C equivalent: SIG_VerifyData

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