Encryption and Decryptiong using Certificates

From: sandi (anonymous_at_discussions.microsoft.com)
Date: 04/17/04

  • Next message: Richard Ward: "Re: Authentication Package/SSPs" 
    Date: Fri, 16 Apr 2004 23:18:55 -0700

    Hi All

    I Have many certificates in my server MY Store with the
    private keys. All the clients will have certificates
    without the private keys, only the public key.

    Whenever a user wants to sign a document he will sign
    from the server using his certificate. The server will be
    always loged in as administrator. And security is
    porvided by the physical access to the server.

    First I export the public key from the certificate to
    say, a file
    CryptAcquireContext()
    CertOpenSystemStore() "MY"
    CertFindCertificateInStore() Subject Name Str
    CryptAcquireCertificatePrivateKey()
    CryptGetUserKey()
    CryptExportKey(,,PUBLICKEYBLOB,,)

    Then I encrypt.This is another application

    1.CryptAcquireContext()
    2.CertOpenSystemStore() "MY"
    3.CertFindCertificateInStore() "Subject name "
    4.CryptAcquireCertificatePrivateKey()
    5.CryptGetUserKey()
    6.CryptEncrypt(), an array of 16 bytes

    I got it encrypted. Now I want to decrypt it using the
    public key from the certificates. This another application

    1.CryptAcquireContext()
    2.CryptImportKey()
    3.CryptDecrypt()

    But Decryption fails with error 8009000D "Keys Does not
    exit"..Pleeaseeeeeeeeeeeeeee help me....
    I dont know wats happening...
    Thanks and lots of love...
    sandi

  • Next message: Richard Ward: "Re: Authentication Package/SSPs"

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