Update getting_started.md

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Guy Wild 2019-09-05 11:38:14 +03:00 committed by GitHub
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@ -553,9 +553,9 @@ with a given key, salt and info:**
1. Set up the key derivation context using the `psa_key_derivation_setup()` 1. Set up the key derivation context using the `psa_key_derivation_setup()`
function, specifying the derivation algorithm `PSA_ALG_HKDF(PSA_ALG_SHA_256)`. function, specifying the derivation algorithm `PSA_ALG_HKDF(PSA_ALG_SHA_256)`.
1. Provide `salt` (optional) with `psa_key_derivation_input_bytes()`. 1. Provide an optional salt with `psa_key_derivation_input_bytes()`.
1. Provide `info` with `psa_key_derivation_input_bytes()`. 1. Provide info with `psa_key_derivation_input_bytes()`.
1. Provide `secret` with `psa_key_derivation_input_key()`, referencing a key that 1. Provide a secret with `psa_key_derivation_input_key()`, referencing a key that
can be used for key derivation. can be used for key derivation.
1. Set the key attributes desired for the new derived key. We'll set 1. Set the key attributes desired for the new derived key. We'll set
the `PSA_KEY_USAGE_ENCRYPT` usage flag and the `PSA_ALG_CTR` algorithm for this the `PSA_KEY_USAGE_ENCRYPT` usage flag and the `PSA_ALG_CTR` algorithm for this