I need to create a signing function to send data to a private API.
The code in Typescript is here, and shown below:
I have attempted to make the same in B4X--seems very straightforward--but I have failed to produce working code.
The code above might have been derived from code elsewhere in this forum. However, it's been a while, and I've lost all track of provenance.
I'm getting errors from the API when using the above Hash function, so I'm pretty sure I'm doing it wrong.
Can anybody give me some clues or fix up the function?
Thank you!
The code in Typescript is here, and shown below:
B4X:
import * as crypto from 'crypto';
export class AuthenticationProvider {
public readonly publicKey: string;
private _privateKey: Buffer;
constructor(
publicKey: string,
privateKey: string,
) {
this.publicKey = publicKey;
// decode the base64 secret
this._privateKey = new Buffer(privateKey, 'base64');
}
public sign(prehashString: string): string {
// create a sha256 hmac with the secret
const hmac = crypto.createHmac('sha256', this._privateKey);
// hash the prehash string and base64 encode the result
return hmac.update(prehashString).digest('base64');
}
}I have attempted to make the same in B4X--seems very straightforward--but I have failed to produce working code.
B4X:
Public Sub HashHmac(data As String, secret As String) As String
Dim m As Mac
Dim kg As KeyGenerator
Dim Result As String
Try
kg.Initialize("HmacSHA256")
kg.KeyFromBytes(secret.GetBytes("UTF8"))
m.Initialise("HmacSHA256", kg.Key)
m.Update(data.GetBytes("UTF8"))
Result = su.EncodeBase64(m.Sign)
Catch
Result = $"HashHmac: ${LastException.Message}"$
End Try
Return Result
End SubThe code above might have been derived from code elsewhere in this forum. However, it's been a while, and I've lost all track of provenance.
I'm getting errors from the API when using the above Hash function, so I'm pretty sure I'm doing it wrong.
Can anybody give me some clues or fix up the function?
Thank you!
