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(Xojo Plugin) Duplicate openssl dgst -sha256 -verify pubKey.pem -signature signature.sig in.datDemonstrates how to duplicate this OpenSSL command: openssl dgst -sha256 -verify pubKey.pem -signature signature.sig in.datThe in.dat file contains the original data that was signed, and can contain text or binary data of any type. The above OpenSSL command does the following:
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Dim pubKey As New Chilkat.PublicKey // Load the public key from an PEM file: Dim success As Boolean success = pubKey.LoadFromFile("pubKey.pem") If (success <> True) Then System.DebugLog(pubKey.LastErrorText) Return End If // Load the data of the original file that was signed. Dim bdFileData As New Chilkat.BinData success = bdFileData.LoadFile("in.dat") // Load the signature. Dim bdSig As New Chilkat.BinData success = bdSig.LoadFile("signature.sig") Dim rsa As New Chilkat.Rsa // Import the public key into the RSA component: success = rsa.ImportPublicKeyObj(pubKey) If (success <> True) Then System.DebugLog(rsa.LastErrorText) Return End If // OpenSSL uses big-endian. rsa.LittleEndian = False success = rsa.VerifyBd(bdFileData,"sha256",bdSig) If (success <> True) Then System.DebugLog(rsa.LastErrorText) System.DebugLog("The signature was invalid.") Return End If System.DebugLog("The signature was verified.") |
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