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(Lianja) Duplicate openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat

Demonstrates how to duplicate this OpenSSL command:

openssl dgst -sha256 -sign private.pem -out sha256.sig in.dat
The in.dat file can contain text or binary data of any type. The OpenSSL command does the following:
  1. Creates a SHA256 digest of the contents of the input file
  2. Signs the SHA256 digest using the private key.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

loPkey = createobject("CkPrivateKey")

// Load the private key from an PEM file:
llSuccess = loPkey.LoadPemFile("private.pem")
if (llSuccess <> .T.) then
    ? loPkey.LastErrorText
    release loPkey
    return
endif

loRsa = createobject("CkRsa")

// Import the private key into the RSA component:
llSuccess = loRsa.ImportPrivateKeyObj(loPkey)
if (llSuccess <> .T.) then
    ? loRsa.LastErrorText
    release loPkey
    release loRsa
    return
endif

// OpenSSL uses big-endian.
loRsa.LittleEndian = .F.

// Load the file to be signed.
loBdFileData = createobject("CkBinData")
llSuccess = loBdFileData.LoadFile("in.dat")

loBdSig = createobject("CkBinData")
llSuccess = loRsa.SignBd(loBdFileData,"sha256",loBdSig)
if (llSuccess <> .T.) then
    ? loRsa.LastErrorText
    release loPkey
    release loRsa
    release loBdFileData
    release loBdSig
    return
endif

// Save the binary signature to a file.
llSuccess = loBdSig.WriteFile("signature.sig")
if (llSuccess <> .T.) then
    ? "Failed to write signature.sig."
    release loPkey
    release loRsa
    release loBdFileData
    release loBdSig
    return
endif

? "Success."


release loPkey
release loRsa
release loBdFileData
release loBdSig

 

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