Use TRNG as additional entropy source on RP2350#10826
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Feb 17, 2026
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Why not just use what pico-sdk does?
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pico_rand uses splitmix64/xoroshiro128** as its conditioner, while this implementation uses SHA-256, which is a cryptographically stronger conditioner. It also gives more control over the TRNG configuration (health tests, sampling rate). This is consistent with what the RP2350 bootrom itself does. As documented in section 12.12.4.1 of the datasheet, the bootrom also uses SHA-256 for entropy conditioning: |
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On RP2350 entropy will come from both the dedicated TRNG peripheral and the ROSC.