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Overview
My name is Daniel Mangum and I am the Chief Technology Officer at Golioth, where I lead engineering efforts that span hardware, firmware, and cloud software.
News
The Simple Elegance of the Integrated Timing Belt Loopback Fastener
I've recently been working on a mechatronics project that involves constructing an X-Y cartesian motion system. I opted to use stepper motors to drive each axis, and timing belts and pulleys for translating the rotational torque of the steppers into linea
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JLink JTAG Access on the Pinecil
It has been more than two years since I bought a Pinecil soldering iron and wrote about soldering the breakout board and accessing the UART. I've been doing more work with the Pinecil as of late following the addition of upstream support for the Bouffalo
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Floating Point Fun on Cortex-M Processors
In my recent post on the PSA Crypto API, I demonstrated the use of the API on two different MCUs: the nRF52840 and the ESP32-S3. In the case of the former, the ECDSA signature operation was eventually executed in a closed source library that manages commu
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PSA Crypto: The P is for Portability
Arm's Platform Security Architecture (PSA) was released in 2017, but it was two years until the first beta release of the PSA Cryptography API in 2019, and another year until the 1.0 specification in 2020. Aimed at securing connected devices and originall
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Fooling Go's X.509 Certificate Verification
Below are two X.509 certificates. The first is the Certificate Authority (CA) root certificate, and the second is a leaf certifcate signed by the private key of the CA. ca.crt.pem -----BEGIN CERTIFICATE----- MIIBejCCASGgAwIBAgIUda4UvlFzwQEO/fD0f4hAnj+ydPY
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