Go

Example: Hash Text in Chunks

Shows how to generate a final hash, like SHA-256, for a large text by processing it in chunks. Go

    success := false

    crypt := chilkat.NewCrypt2()
    crypt.SetHashAlgorithm("sha256")
    crypt.SetCharset("utf-8")

    bd := chilkat.NewBinData()

    s := "The quick brown fox jumped over the lazy dog.\r\n"

    // Accumulate the text in a StringBuilder.  We'll demonstrate hashing the text in chunks,
    // and then also hashing the entire text at once to show the results are the same.

    bd.AppendString(s,"utf-8")
    success = crypt.HashBeginString(s)

    i := 0
    for i < 200 {
        bd.AppendString(s,"utf-8")
        crypt.HashMoreString(s)
        i = i + 1
    }

    // Get the hash in base64 format.
    crypt.SetEncodingMode("base64")

    encodedHash := crypt.HashFinalENC()
    fmt.Println("Hash computed in chunks: ", *encodedHash)

    // Let's alternatively compute the hash of the entire amount of data at once,
    // to show the hash computation is the same:
    encodedHash = crypt.HashBdENC(bd)
    fmt.Println("Hash computed in 1 step: ", *encodedHash)

    // Output:

    // Hash computed in chunks: unwkVff61k40roRIJizaknreScHaL6frWe37kydXbZQ=
    // Hash computed in 1 step: unwkVff61k40roRIJizaknreScHaL6frWe37kydXbZQ=

    crypt.DisposeCrypt2()
    bd.DisposeBinData()