PowerBuilder

Compute JWK Thumbprint for RSA and EC Public Keys

See more ECC Examples

Demonstrates how to compute a JSON Web Key thumbprint for a public key (RSA or ECC).

Note: This example requires Chilkat v9.5.0.66 or greater.

PowerBuilder

integer li_rc
integer li_Success
oleobject loo_PubKey
oleobject loo_Sb

li_Success = 0

loo_PubKey = create oleobject
li_rc = loo_PubKey.ConnectToNewObject("Chilkat.PublicKey")
if li_rc < 0 then
    destroy loo_PubKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// A public key can be loaded from any format (binary DER, PEM, etc.)
// This example will load the public keys from JWK format, 
// and will then compute the JWK thumbprint.

// First do it for an RSA public key...

loo_Sb = create oleobject
li_rc = loo_Sb.ConnectToNewObject("Chilkat.StringBuilder")

loo_Sb.Append("{")
loo_Sb.Append("~"kty~": ~"RSA~",")
loo_Sb.Append("~"n~": ~"0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx4cbbfAAt")
loo_Sb.Append("VT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMstn6")
loo_Sb.Append("4tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FD")
loo_Sb.Append("W2QvzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n9")
loo_Sb.Append("1CbOpbISD08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINH")
loo_Sb.Append("aQ-G_xBniIqbw0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw~",")
loo_Sb.Append("~"e~": ~"AQAB~",")
loo_Sb.Append("~"alg~": ~"RS256~",")
loo_Sb.Append("~"kid~": ~"2011-04-29~"")
loo_Sb.Append("}")

// The JWK format is automatically detected..
li_Success = loo_PubKey.LoadFromString(loo_Sb.GetAsString())
if li_Success <> 1 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_PubKey
    destroy loo_Sb
    return
end if

// Get the JWK thumbprint (using SHA256)
Write-Debug "JWK thumbprint: " + loo_PubKey.GetJwkThumbprint("SHA256")

// Output:
// JWK thumbprint: NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs

// --------------------------------------------------------------
// Now let's do an EC public key:
loo_Sb.Clear()
loo_Sb.Append("{ ")
loo_Sb.Append("  ~"kty~": ~"EC~",")
loo_Sb.Append("  ~"crv~": ~"P-256~",")
loo_Sb.Append("  ~"x~": ~"tDeeYABgKEAbWicYPCEEI8sP4SRIhHKcHDW7VqrB4LA~",")
loo_Sb.Append("  ~"y~": ~"J08HOoIZ0rX2Me3bNFZUltfxIk1Hrc8FsLu8VaSxsMI~"")
loo_Sb.Append("}")

li_Success = loo_PubKey.LoadFromString(loo_Sb.GetAsString())
if li_Success <> 1 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_PubKey
    destroy loo_Sb
    return
end if

// Get the JWK thumbprint (using SHA256)
Write-Debug "JWK thumbprint: " + loo_PubKey.GetJwkThumbprint("SHA256")

// Output:
// JWK thumbprint: 8fm8079s3nu4FLV_7dVJoJ69A8XCXn7Za2mtaWCnxR4


destroy loo_PubKey
destroy loo_Sb