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(DataFlex) Decrypt S/MIME and Verify S/MIME SignaturesDataFlex example to decrypt S/MIME and verify S/MIME signatures. The S/MIME is unwrapped to get the original MIME prior to signing/encrypting. Note: This example requires Chilkat v11.0.0 or greater.
Use ChilkatAx-win32.pkg Procedure Test Boolean iSuccess Handle hoMime Boolean iIsEncrypted Boolean iIsSigned Variant vSignerCert Handle hoSignerCert Variant vDecryptCert Handle hoDecryptCert String sTemp1 Move False To iSuccess // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Get Create (RefClass(cComChilkatMime)) To hoMime If (Not(IsComObjectCreated(hoMime))) Begin Send CreateComObject of hoMime End // Load an S/MIME message from a file: Get ComLoadMimeFile Of hoMime "signedMime.txt" To iSuccess If (iSuccess = False) Begin Get ComLastErrorText Of hoMime To sTemp1 Showln sTemp1 Procedure_Return End // The ContainsEncryptedParts/ContainsSignedParts methods // can be called to determine if the MIME is encrypted and/or signed: Get ComContainsEncryptedParts Of hoMime To iIsEncrypted Get ComContainsSignedParts Of hoMime To iIsSigned // We don't want the "unwrap extras". You'll see what those // are in a few moments... Set ComUnwrapExtras Of hoMime To False // To verify the signature, call UnwrapSecurity. This will // verify the signature(s) and decrypt the S/MIME and restore // the MIME to the unsigned/unencrypted state. // The results of what was found are present in the MIME object's // properties, as well as extra header fields that are added // to the unwrapped MIME. Get ComUnwrapSecurity Of hoMime To iSuccess If (iSuccess <> True) Begin // UnwrapSecurity returns True if all signatures were // verified and all parts decrypted. Get ComLastErrorText Of hoMime To sTemp1 Showln sTemp1 Procedure_Return End // The mime.UnwrapExtras property controls whether or not // these additional fields are added to the unwrapped MIME: // // X-NumPartsSigned: 1 // X-SignaturesValid: yes // X-NumPartsEncrypted: 1 // X-Decrypted: no // // The X-NumPartsSigned/X-SignaturesValid headers are added // if the MIME was signed. // // The X-NumPartsEncrypted/X-Decrypted headers are added // if the MIME was encrypted. // // If the MIME was signed, get the certificate used for signing. If (iIsSigned = True) Begin Get Create (RefClass(cComChilkatCert)) To hoSignerCert If (Not(IsComObjectCreated(hoSignerCert))) Begin Send CreateComObject of hoSignerCert End // The NumSignerCerts property indicates how many certificates // were used for signing. This example will assume the value is 1. // To get the 1st signer cert, call LastSignerCert with an index of 0: Get pvComObject of hoSignerCert to vSignerCert Get ComLastSignerCert Of hoMime 0 vSignerCert To iSuccess If (iSuccess = True) Begin Get ComSubjectCN Of hoSignerCert To sTemp1 Showln "**** Signer Cert: " sTemp1 End End // If the MIME was encrypted, get the certificate used for decryption If (iIsEncrypted = True) Begin // The NumDecryptCerts property indicates how many certificates // were used for decrypting. This example will assume the value is 1. // To get the 1st decrypt cert, call LastDecryptCert with an index of 0: Get Create (RefClass(cComChilkatCert)) To hoDecryptCert If (Not(IsComObjectCreated(hoDecryptCert))) Begin Send CreateComObject of hoDecryptCert End Get pvComObject of hoDecryptCert to vDecryptCert Get ComLastDecryptCert Of hoMime 0 vDecryptCert To iSuccess If (iSuccess = True) Begin Get ComSubjectCN Of hoDecryptCert To sTemp1 Showln "**** Decrypt Cert: " sTemp1 End End // Display the unwrapped MIME: Get ComGetMime Of hoMime To sTemp1 Showln sTemp1 // Save the unwrapped MIME to a file: Get ComSaveMime Of hoMime "unwrappedMime.txt" To iSuccess End_Procedure |
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