Source: openagent-sdk/crates/openagent-crypto-wasm/src/hkdf_sha256.rs. SHA-256: 150f18f8e76586b7619205c3804ac25284d3c64360f906764ee4bd462fdebc1a.

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hkdf_sha256::PRK_LEN

Length of the HKDF-SHA256 PRK output (== HashLen).

pub const PRK_LEN: usize;

Source line: 17.

hkdf_sha256::extract

Performs HKDF-Extract(salt, IKM).

Returns the 32-byte pseudo-random key.

Arguments

• salt — optional salt; pass an empty slice for the "no salt" case (the HKDF will internally use 32 zero bytes per RFC 5869).
• ikm — input keying material.

pub fn extract(salt: &[u8], ikm: &[u8]) -> [u8; PRK_LEN];

Source line: 28.

hkdf_sha256::expand

Performs HKDF-Expand(PRK, info, length).

Errors

• [CryptoError::InvalidLength] if prk is not exactly 32 bytes.
• [CryptoError::HkdfFailed] if length exceeds 255 * HashLen (8160 bytes for SHA-256), which is the maximum allowed by RFC 5869.

pub fn expand(prk: &[u8], info: &[u8], length: usize) -> Result<Vec<u8>, CryptoError>;

Source line: 43.

hkdf_sha256::derive

Convenience: combined HKDF-Extract + HKDF-Expand in one call.

Equivalent to running [extract] then [expand] but avoids exposing the intermediate PRK to the caller.

Errors

[CryptoError::HkdfFailed] if length exceeds 255 * HashLen.

pub fn derive(salt: &[u8], ikm: &[u8], info: &[u8], length: usize) -> Result<Vec<u8>, CryptoError>;

Source line: 68.