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Rust wrapper: add wolfssl::wolfcrypt::kdf, wolfssl::wolfcrypt::prf

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This commit is contained in:
Josh Holtrop
2025-10-23 09:23:46 -04:00
parent 33b08ed136
commit 5b8115ed8f
7 changed files with 418 additions and 2 deletions
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3
doc/dox_comments/header_files/hmac.h
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@@ -534,8 +534,7 @@ int wc_Tls13_HKDF_Expand_Label_ex(
\ingroup HMAC
\brief Expand data using HMAC, salt and label and info. TLS v1.3 defines
this function for key derivation. This is the _ex version adding heap hint
and device identifier.
this function for key derivation.
\return 0 Returned upon successfully generating a key with the given inputs
\return BAD_FUNC_ARG Returned if an invalid hash type is given (see type param)

4
wrapper/rust/include.am
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@@ -21,6 +21,8 @@ EXTRA_DIST += wrapper/rust/wolfssl/src/wolfcrypt/dh.rs
EXTRA_DIST += wrapper/rust/wolfssl/src/wolfcrypt/ecc.rs
EXTRA_DIST += wrapper/rust/wolfssl/src/wolfcrypt/hkdf.rs
EXTRA_DIST += wrapper/rust/wolfssl/src/wolfcrypt/hmac.rs
EXTRA_DIST += wrapper/rust/wolfssl/src/wolfcrypt/kdf.rs
EXTRA_DIST += wrapper/rust/wolfssl/src/wolfcrypt/prf.rs
EXTRA_DIST += wrapper/rust/wolfssl/src/wolfcrypt/random.rs
EXTRA_DIST += wrapper/rust/wolfssl/src/wolfcrypt/rsa.rs
EXTRA_DIST += wrapper/rust/wolfssl/src/wolfcrypt/sha.rs
@@ -29,6 +31,8 @@ EXTRA_DIST += wrapper/rust/wolfssl/tests/test_dh.rs
EXTRA_DIST += wrapper/rust/wolfssl/tests/test_ecc.rs
EXTRA_DIST += wrapper/rust/wolfssl/tests/test_hkdf.rs
EXTRA_DIST += wrapper/rust/wolfssl/tests/test_hmac.rs
EXTRA_DIST += wrapper/rust/wolfssl/tests/test_kdf.rs
EXTRA_DIST += wrapper/rust/wolfssl/tests/test_prf.rs
EXTRA_DIST += wrapper/rust/wolfssl/tests/test_random.rs
EXTRA_DIST += wrapper/rust/wolfssl/tests/test_rsa.rs
EXTRA_DIST += wrapper/rust/wolfssl/tests/test_sha.rs

2
wrapper/rust/wolfssl/src/wolfcrypt.rs
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@@ -23,6 +23,8 @@ pub mod dh;
pub mod ecc;
pub mod hkdf;
pub mod hmac;
pub mod kdf;
pub mod prf;
pub mod random;
pub mod rsa;
pub mod sha;

191
wrapper/rust/wolfssl/src/wolfcrypt/kdf.rs Normal file
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@@ -0,0 +1,191 @@
/*
* Copyright (C) 2025 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
/*!
This module provides a Rust wrapper for the wolfCrypt library's Key Derivation
Function (KDF) functionality.
It leverages the `wolfssl-sys` crate for low-level FFI bindings, encapsulating
the raw C functions in a memory-safe and easy-to-use Rust API.
*/
use crate::wolfcrypt::hmac::HMAC;
use wolfssl_sys as ws;
/// Perform RFC 5869 HKDF-Extract operation for TLS v1.3 key derivation.
///
/// # Parameters
///
/// * `typ`: Hash type, one of `HMAC::TYPE_*`.
/// * `salt`: Optional Salt value.
/// * `key`: Optional Initial Key Material (IKM).
/// * `out`: Output buffer to store TLS1.3 HKDF-Extract result (generated
/// Pseudo-Random Key (PRK)). The size of this buffer must match
/// `HMAC::get_hmac_size_by_type(typ)`.
///
/// # Returns
///
/// Returns either Ok(()) on success or Err(e) containing the wolfSSL
/// library error code value.
///
/// # Example
///
/// ```rust
/// use wolfssl::wolfcrypt::hmac::HMAC;
/// use wolfssl::wolfcrypt::kdf::*;
/// use wolfssl_sys as ws;
/// let mut secret = [0u8; ws::WC_SHA256_DIGEST_SIZE as usize];
/// tls13_hkdf_extract(HMAC::TYPE_SHA256, None, None, &mut secret).expect("Error with tls13_hkdf_extract()");
/// ```
pub fn tls13_hkdf_extract(typ: i32, salt: Option<&[u8]>, key: Option<&mut [u8]>, out: &mut [u8]) -> Result<(), i32> {
let mut salt_ptr = core::ptr::null();
let mut salt_size = 0u32;
if let Some(salt) = salt {
salt_ptr = salt.as_ptr();
salt_size = salt.len() as u32;
}
let mut ikm_buf = [0u8; ws::WC_MAX_DIGEST_SIZE as usize];
let mut ikm_ptr = ikm_buf.as_mut_ptr();
let mut ikm_size = 0u32;
if let Some(key) = key {
if key.len() > 0 {
ikm_ptr = key.as_mut_ptr();
ikm_size = key.len() as u32;
}
}
if out.len() != HMAC::get_hmac_size_by_type(typ)? {
return Err(ws::wolfCrypt_ErrorCodes_BUFFER_E);
}
let rc = unsafe {
ws::wc_Tls13_HKDF_Extract(out.as_mut_ptr(), salt_ptr, salt_size,
ikm_ptr, ikm_size, typ)
};
if rc != 0 {
return Err(rc);
}
Ok(())
}
/// Perform RFC 5869 HKDF-Extract operation for TLS v1.3 key derivation.
///
/// This utilizes HMAC to convert `key`, `label`, and `info` into a
/// derived key which is written to `out`.
///
/// # Parameters
///
/// * `typ`: Hash type, one of `HMAC::TYPE_*`.
/// * `key`: Key to use for KDF (typically output of `tls13_hkdf_extract()`).
/// * `protocol`: Buffer containing TLS protocol.
/// * `label`: Buffer containing label.
/// * `info`: Buffer containing additional info.
/// * `out`: Output buffer to store TLS1.3 HKDF-Expand result. The buffer can be
/// any size.
///
/// # Returns
///
/// Returns either Ok(()) on success or Err(e) containing the wolfSSL
/// library error code value.
///
/// # Example
///
/// ```rust
/// use wolfssl::wolfcrypt::hmac::HMAC;
/// use wolfssl::wolfcrypt::kdf::*;
/// use wolfssl_sys as ws;
/// let hash_hello1 = [
/// 0x63u8, 0x83, 0x58, 0xab, 0x36, 0xcd, 0x0c, 0xf3,
/// 0x26, 0x07, 0xb5, 0x5f, 0x0b, 0x8b, 0x45, 0xd6,
/// 0x7d, 0x5b, 0x42, 0xdc, 0xa8, 0xaa, 0x06, 0xfb,
/// 0x20, 0xa5, 0xbb, 0x85, 0xdb, 0x54, 0xd8, 0x8b
/// ];
/// let client_early_traffic_secret = [
/// 0x20u8, 0x18, 0x72, 0x7c, 0xde, 0x3a, 0x85, 0x17, 0x72, 0xdc, 0xd7, 0x72,
/// 0xb0, 0xfc, 0x45, 0xd0, 0x62, 0xb9, 0xbb, 0x38, 0x69, 0x05, 0x7b, 0xb4,
/// 0x5e, 0x58, 0x5d, 0xed, 0xcd, 0x0b, 0x96, 0xd3
/// ];
/// let mut secret = [0u8; ws::WC_SHA256_DIGEST_SIZE as usize];
/// tls13_hkdf_extract(HMAC::TYPE_SHA256, None, None, &mut secret).expect("Error with tls13_hkdf_extract()");
/// let protocol_label = b"tls13 ";
/// let ce_traffic_label = b"c e traffic";
/// let mut expand_out = [0u8; ws::WC_SHA256_DIGEST_SIZE as usize];
/// tls13_hkdf_expand_label(HMAC::TYPE_SHA256, &secret,
/// protocol_label, ce_traffic_label,
/// &hash_hello1, &mut expand_out).expect("Error with tls13_hkdf_expand_label()");
/// ```
pub fn tls13_hkdf_expand_label(typ: i32, key: &[u8], protocol: &[u8], label: &[u8], info: &[u8], out: &mut [u8]) -> Result<(), i32> {
let key_size = key.len() as u32;
let protocol_size = protocol.len() as u32;
let label_size = label.len() as u32;
let info_size = info.len() as u32;
let out_size = out.len() as u32;
let rc = unsafe {
ws::wc_Tls13_HKDF_Expand_Label(out.as_mut_ptr(), out_size,
key.as_ptr(), key_size, protocol.as_ptr(), protocol_size,
label.as_ptr(), label_size, info.as_ptr(), info_size, typ)
};
if rc != 0 {
return Err(rc);
}
Ok(())
}
/// Perform SSH KDF operation.
///
/// # Parameters
///
/// * `typ`: Hash type, one of `HMAC::TYPE_*`.
/// * `key_id`: Key ID, typically 'A' through 'F'.
/// * `k`: Initial key.
/// * `h`: Exchange hash.
/// * `session_id`: Unique identifier for the SSH session.
/// * `key`: Output buffer.
///
/// # Returns
///
/// Returns either Ok(()) on success or Err(e) containing the wolfSSL
/// library error code value.
///
/// # Example
///
/// ```rust
/// use wolfssl::wolfcrypt::hmac::HMAC;
/// use wolfssl::wolfcrypt::kdf::*;
/// let k = [0x42u8; 256];
/// let h = [0x43u8; 32];
/// let sid = [0x44u8; 32];
/// let mut out = [0u8; 16];
/// ssh_kdf(HMAC::TYPE_SHA256, b'A', &k, &h, &sid, &mut out).expect("Error with ssh_kdf()");
/// ```
pub fn ssh_kdf(typ: i32, key_id: u8, k: &[u8], h: &[u8], session_id: &[u8], key: &mut [u8]) -> Result<(), i32> {
let key_size = key.len() as u32;
let k_size = k.len() as u32;
let h_size = h.len() as u32;
let session_size = session_id.len() as u32;
let rc = unsafe {
ws::wc_SSH_KDF(typ as u8, key_id,
key.as_mut_ptr(), key_size,
k.as_ptr(), k_size, h.as_ptr(), h_size,
session_id.as_ptr(), session_size)
};
if rc != 0 {
return Err(rc);
}
Ok(())
}

96
wrapper/rust/wolfssl/src/wolfcrypt/prf.rs Normal file
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@@ -0,0 +1,96 @@
/*
* Copyright (C) 2025 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
/*!
This module provides a Rust wrapper for the wolfCrypt library's Pseudo Random
Function (PRF) functionality.
It leverages the `wolfssl-sys` crate for low-level FFI bindings, encapsulating
the raw C functions in a memory-safe and easy-to-use Rust API.
*/
use wolfssl_sys as ws;
pub const PRF_HASH_NONE: i32 = ws::wc_MACAlgorithm_no_mac as i32;
pub const PRF_HASH_MD5: i32 = ws::wc_MACAlgorithm_md5_mac as i32;
pub const PRF_HASH_SHA: i32 = ws::wc_MACAlgorithm_sha_mac as i32;
pub const PRF_HASH_SHA224: i32 = ws::wc_MACAlgorithm_sha224_mac as i32;
pub const PRF_HASH_SHA256: i32 = ws::wc_MACAlgorithm_sha256_mac as i32;
pub const PRF_HASH_SHA384: i32 = ws::wc_MACAlgorithm_sha384_mac as i32;
pub const PRF_HASH_SHA512: i32 = ws::wc_MACAlgorithm_sha512_mac as i32;
pub const PRF_HASH_RMD: i32 = ws::wc_MACAlgorithm_rmd_mac as i32;
pub const PRF_HASH_BLAKE2B: i32 = ws::wc_MACAlgorithm_blake2b_mac as i32;
pub const PRF_HASH_SM3: i32 = ws::wc_MACAlgorithm_sm3_mac as i32;
/// Pseudo Random Function for MD5, SHA-1, SHA-256, SHA-384, or SHA-512
///
/// # Parameters
///
/// * `secret`: Secret key.
/// * `seed`: Seed.
/// * `hash_type`: PRF Hash type, one of `PRF_HASH_*`.
/// * `heap`: Heap hint.
/// * `dev_id` Device ID to use with crypto callbacks or async hardware.
/// Set to INVALID_DEVID (-2) if not used.
/// * `dout`: Output buffer.
///
/// # Returns
///
/// Returns either Ok(()) on success or Err(e) containing the wolfSSL
/// library error code value.
///
/// # Example
///
/// ```rust
/// use wolfssl::wolfcrypt::prf::*;
/// use wolfssl_sys as ws;
/// let secret = [0x10u8, 0xbc, 0xb4, 0xa2, 0xe8, 0xdc, 0xf1, 0x9b, 0x4c,
/// 0x51, 0x9c, 0xed, 0x31, 0x1b, 0x51, 0x57, 0x02, 0x3f,
/// 0xa1, 0x7d, 0xfb, 0x0e, 0xf3, 0x4e, 0x8f, 0x6f, 0x71,
/// 0xa3, 0x67, 0x76, 0x6b, 0xfa, 0x5d, 0x46, 0x4a, 0xe8,
/// 0x61, 0x18, 0x81, 0xc4, 0x66, 0xcc, 0x6f, 0x09, 0x99,
/// 0x9d, 0xfc, 0x47];
/// let seed = [0x73u8, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x66, 0x69,
/// 0x6e, 0x69, 0x73, 0x68, 0x65, 0x64, 0x0b, 0x46, 0xba,
/// 0x56, 0xbf, 0x1f, 0x5d, 0x99, 0xff, 0xe9, 0xbb, 0x43,
/// 0x01, 0xe7, 0xca, 0x2c, 0x00, 0xdf, 0x9a, 0x39, 0x6e,
/// 0xcf, 0x6d, 0x15, 0x27, 0x4d, 0xf2, 0x93, 0x96, 0x4a,
/// 0x91, 0xde, 0x5c, 0xc0, 0x47, 0x7c, 0xa8, 0xae, 0xcf,
/// 0x5d, 0x93, 0x5f, 0x4c, 0x92, 0xcc, 0x98, 0x5b, 0x43];
/// let mut out = [0u8; 12];
/// prf(&secret, &seed, PRF_HASH_SHA384,
/// core::ptr::null_mut(), ws::INVALID_DEVID,
/// &mut out).expect("Error with prf()");
/// ```
pub fn prf(secret: &[u8], seed: &[u8], hash_type: i32, heap: *mut ::std::os::raw::c_void, dev_id: i32, dout: &mut [u8]) -> Result<(), i32> {
let secret_size = secret.len() as u32;
let seed_size = seed.len() as u32;
let dout_size = dout.len() as u32;
let rc = unsafe {
ws::wc_PRF(dout.as_mut_ptr(), dout_size,
secret.as_ptr(), secret_size,
seed.as_ptr(), seed_size,
hash_type, heap, dev_id)
};
if rc != 0 {
return Err(rc);
}
Ok(())
}

93
wrapper/rust/wolfssl/tests/test_kdf.rs Normal file
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@@ -0,0 +1,93 @@
use wolfssl::wolfcrypt::hmac::HMAC;
use wolfssl::wolfcrypt::kdf::*;
use wolfssl_sys as ws;
#[test]
fn test_tls13_hkdf_extract_expand() {
let hash_hello1 = [
0x63u8, 0x83, 0x58, 0xab, 0x36, 0xcd, 0x0c, 0xf3,
0x26, 0x07, 0xb5, 0x5f, 0x0b, 0x8b, 0x45, 0xd6,
0x7d, 0x5b, 0x42, 0xdc, 0xa8, 0xaa, 0x06, 0xfb,
0x20, 0xa5, 0xbb, 0x85, 0xdb, 0x54, 0xd8, 0x8b
];
let client_early_traffic_secret = [
0x20u8, 0x18, 0x72, 0x7c, 0xde, 0x3a, 0x85, 0x17, 0x72, 0xdc, 0xd7, 0x72,
0xb0, 0xfc, 0x45, 0xd0, 0x62, 0xb9, 0xbb, 0x38, 0x69, 0x05, 0x7b, 0xb4,
0x5e, 0x58, 0x5d, 0xed, 0xcd, 0x0b, 0x96, 0xd3
];
let mut secret = [0u8; ws::WC_SHA256_DIGEST_SIZE as usize];
tls13_hkdf_extract(HMAC::TYPE_SHA256, None, None, &mut secret).expect("Error with tls13_hkdf_extract()");
let protocol_label = b"tls13 ";
let ce_traffic_label = b"c e traffic";
let mut expand_out = [0u8; ws::WC_SHA256_DIGEST_SIZE as usize];
tls13_hkdf_expand_label(HMAC::TYPE_SHA256, &secret,
protocol_label, ce_traffic_label,
&hash_hello1, &mut expand_out).expect("Error with tls13_hkdf_expand_label()");
assert_eq!(expand_out, client_early_traffic_secret);
}
#[test]
fn test_ssh_kdf() {
let ssh_kdf_set3_k = [
0x6Au8, 0xC3, 0x82, 0xEA, 0xAC, 0xA0, 0x93, 0xE1,
0x25, 0xE2, 0x5C, 0x24, 0xBE, 0xBC, 0x84, 0x64,
0x0C, 0x11, 0x98, 0x75, 0x07, 0x34, 0x4B, 0x5C,
0x73, 0x9C, 0xEB, 0x84, 0xA9, 0xE0, 0xB2, 0x22,
0xB9, 0xA8, 0xB5, 0x1C, 0x83, 0x9E, 0x5E, 0xBE,
0x49, 0xCF, 0xAD, 0xBF, 0xB3, 0x95, 0x99, 0x76,
0x4E, 0xD5, 0x22, 0x09, 0x9D, 0xC9, 0x12, 0x75,
0x19, 0x50, 0xDC, 0x7D, 0xC9, 0x7F, 0xBD, 0xC0,
0x63, 0x28, 0xB6, 0x8F, 0x22, 0x78, 0x1F, 0xD3,
0x15, 0xAF, 0x56, 0x80, 0x09, 0xA5, 0x50, 0x9E,
0x5B, 0x87, 0xA1, 0x1B, 0xF5, 0x27, 0xC0, 0x56,
0xDA, 0xFF, 0xD8, 0x2A, 0xB6, 0xCB, 0xC2, 0x5C,
0xCA, 0x37, 0x14, 0x34, 0x59, 0xE7, 0xBC, 0x63,
0xBC, 0xDE, 0x52, 0x75, 0x7A, 0xDE, 0xB7, 0xDF,
0x01, 0xCF, 0x12, 0x17, 0x3F, 0x1F, 0xEF, 0x81,
0x02, 0xEC, 0x5A, 0xB1, 0x42, 0xC2, 0x13, 0xDD,
0x9D, 0x30, 0x69, 0x62, 0x78, 0xA8, 0xD8, 0xBC,
0x32, 0xDD, 0xE9, 0x59, 0x2D, 0x28, 0xC0, 0x78,
0xC6, 0xD9, 0x2B, 0x94, 0x7D, 0x82, 0x5A, 0xCA,
0xAB, 0x64, 0x94, 0x84, 0x6A, 0x49, 0xDE, 0x24,
0xB9, 0x62, 0x3F, 0x48, 0x89, 0xE8, 0xAD, 0xC3,
0x8E, 0x8C, 0x66, 0x9E, 0xFF, 0xEF, 0x17, 0x60,
0x40, 0xAD, 0x94, 0x5E, 0x90, 0xA7, 0xD3, 0xEE,
0xC1, 0x5E, 0xFE, 0xEE, 0x78, 0xAE, 0x71, 0x04,
0x3C, 0x96, 0x51, 0x11, 0x03, 0xA1, 0x6B, 0xA7,
0xCA, 0xF0, 0xAC, 0xD0, 0x64, 0x2E, 0xFD, 0xBE,
0x80, 0x99, 0x34, 0xFA, 0xA1, 0xA5, 0xF1, 0xBD,
0x11, 0x04, 0x36, 0x49, 0xB2, 0x5C, 0xCD, 0x1F,
0xEE, 0x2E, 0x38, 0x81, 0x5D, 0x4D, 0x5F, 0x5F,
0xC6, 0xB4, 0x10, 0x29, 0x69, 0xF2, 0x1C, 0x22,
0xAE, 0x1B, 0x0E, 0x7D, 0x36, 0x03, 0xA5, 0x56,
0xA1, 0x32, 0x62, 0xFF, 0x62, 0x8D, 0xE2, 0x22
];
let ssh_kdf_set3_h = [
0x7B, 0x70, 0x01, 0x18, 0x5E, 0x25, 0x6D, 0x44,
0x93, 0x44, 0x5F, 0x39, 0xA5, 0x5F, 0xB9, 0x05,
0xE6, 0x32, 0x1F, 0x4B, 0x5D, 0xD8, 0xBB, 0xF3,
0x10, 0x0D, 0x51, 0xBA, 0x0B, 0xDA, 0x3D, 0x2D
];
let ssh_kdf_set3_sid = [
0x7B, 0x70, 0x01, 0x18, 0x5E, 0x25, 0x6D, 0x44,
0x93, 0x44, 0x5F, 0x39, 0xA5, 0x5F, 0xB9, 0x05,
0xE6, 0x32, 0x1F, 0x4B, 0x5D, 0xD8, 0xBB, 0xF3,
0x10, 0x0D, 0x51, 0xBA, 0x0B, 0xDA, 0x3D, 0x2D
];
let ssh_kdf_set3_a = [
0x81, 0xF0, 0x33, 0x0E, 0xF6, 0xF0, 0x53, 0x61,
0xB3, 0x82, 0x3B, 0xFD, 0xED, 0x6E, 0x1D, 0xE9
];
let mut out = [0u8; 16];
ssh_kdf(HMAC::TYPE_SHA256, b'A', &ssh_kdf_set3_k, &ssh_kdf_set3_h,
&ssh_kdf_set3_sid, &mut out).expect("Error with ssh_kdf()");
assert_eq!(out, ssh_kdf_set3_a);
}

31
wrapper/rust/wolfssl/tests/test_prf.rs Normal file
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@@ -0,0 +1,31 @@
use wolfssl::wolfcrypt::prf::*;
use wolfssl_sys as ws;
#[test]
fn test_kdf_prf() {
let secret = [0x10u8, 0xbc, 0xb4, 0xa2, 0xe8, 0xdc, 0xf1, 0x9b, 0x4c,
0x51, 0x9c, 0xed, 0x31, 0x1b, 0x51, 0x57, 0x02, 0x3f,
0xa1, 0x7d, 0xfb, 0x0e, 0xf3, 0x4e, 0x8f, 0x6f, 0x71,
0xa3, 0x67, 0x76, 0x6b, 0xfa, 0x5d, 0x46, 0x4a, 0xe8,
0x61, 0x18, 0x81, 0xc4, 0x66, 0xcc, 0x6f, 0x09, 0x99,
0x9d, 0xfc, 0x47];
let seed = [0x73u8, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x66, 0x69,
0x6e, 0x69, 0x73, 0x68, 0x65, 0x64, 0x0b, 0x46, 0xba,
0x56, 0xbf, 0x1f, 0x5d, 0x99, 0xff, 0xe9, 0xbb, 0x43,
0x01, 0xe7, 0xca, 0x2c, 0x00, 0xdf, 0x9a, 0x39, 0x6e,
0xcf, 0x6d, 0x15, 0x27, 0x4d, 0xf2, 0x93, 0x96, 0x4a,
0x91, 0xde, 0x5c, 0xc0, 0x47, 0x7c, 0xa8, 0xae, 0xcf,
0x5d, 0x93, 0x5f, 0x4c, 0x92, 0xcc, 0x98, 0x5b, 0x43];
let expected = [0xeeu8, 0xcb, 0xb1, 0x30, 0xf2, 0xcd, 0xb3, 0x4a,
0xbe, 0xda, 0xc1, 0xf6];
let mut out = [0u8; 12];
prf(&secret, &seed, PRF_HASH_SHA384,
core::ptr::null_mut(), ws::INVALID_DEVID,
&mut out).expect("Error with prf()");
assert_eq!(out, expected);
}