In another question How do I work with SS58 encoded addresses? the same question was addressed, this is however about how to do it without the std lib.

How to convert an ss58 stored in a String to an AccountId32 or [u8;32]

When running in rich environment, it is easy to convert from ss58 format to AccountId32 using:

use sp_core::{crypto::AccountId32, sp_std};

let a:AccountId32 = sp_std::str::FromStr::from_str(&s);

But checking the source code in sp-core-20.0.0/src/crypto.rs I can see the FromStr trait is guarded by a feature flag #[cfg(feature = "std")] and defined only when compiled in std.

It would of course be possible for me to clone and duplicate this code for core but is there a better way to run this conversion in a no_std environment?

Edit: There is a similar question Is there any way to convert an ss58 address to the 32 bytes pubkey? but the answers is all about running in a shell which is not what I'm asking for

  • Does this answer your question? Is there any way to convert an ss58 address to the 32 bytes pubkey? Apr 19, 2023 at 2:26
  • No answer yet, but duplicated. Apr 19, 2023 at 2:28
  • The question asks the same thing but I think my question is better phrased and more likely to be helpful in the future. Also as you point out there are no answers to it
    – Simson
    Apr 19, 2023 at 3:43
  • Yep. But I hope we can close one. (maybe that one) Apr 19, 2023 at 4:13
  • 1
    I believe this is not possible. And most probably this is intended to discourage passing ss58-encoded addresses to the runtime. The recommended way of passing data is with scale codec, not any string-based serialization. Apr 20, 2023 at 9:33

1 Answer 1


I had the same challenge, but could not find a way. At the end I listed my addresses as [u8;32] but using hex-literalfor some ergonomic, and had a [std] test asserting the list against the same list of address in ss58 format.

  • This does not answer my question but it solves the problem. Accepted and upvoted.
    – Simson
    May 12, 2023 at 3:53

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