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</pre><pre class='rust '>
<span class='comment'>// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class='comment'>// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
<span class='comment'>// except according to those terms.</span>
<span class='doccomment'>/*!
* This module implements the PBKDF2 Key Derivation Function as specified by
* http://tools.ietf.org/html/rfc2898.
*/</span>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>repeat</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>io</span>;
<span class='kw'>use</span> <span class='ident'>cryptoutil</span>::<span class='ident'>copy_memory</span>;
<span class='kw'>use</span> <span class='ident'>rand</span>::{<span class='ident'>OsRng</span>, <span class='ident'>Rng</span>};
<span class='kw'>use</span> <span class='ident'>serialize</span>::<span class='ident'>base64</span>;
<span class='kw'>use</span> <span class='ident'>serialize</span>::<span class='ident'>base64</span>::{<span class='ident'>FromBase64</span>, <span class='ident'>ToBase64</span>};
<span class='kw'>use</span> <span class='ident'>cryptoutil</span>::{<span class='ident'>read_u32_be</span>, <span class='ident'>write_u32_be</span>};
<span class='kw'>use</span> <span class='ident'>hmac</span>::<span class='ident'>Hmac</span>;
<span class='kw'>use</span> <span class='ident'>mac</span>::<span class='ident'>Mac</span>;
<span class='kw'>use</span> <span class='ident'>sha2</span>::<span class='ident'>Sha256</span>;
<span class='kw'>use</span> <span class='ident'>util</span>::<span class='ident'>fixed_time_eq</span>;
<span class='comment'>// Calculate a block of the output of size equal to the output_bytes of the underlying Mac function</span>
<span class='comment'>// mac - The Mac function to use</span>
<span class='comment'>// salt - the salt value to use</span>
<span class='comment'>// c - the iteration count</span>
<span class='comment'>// idx - the 1 based index of the block</span>
<span class='comment'>// scratch - a temporary variable the same length as the block</span>
<span class='comment'>// block - the block of the output to calculate</span>
<span class='kw'>fn</span> <span class='ident'>calculate_block</span><span class='op'><</span><span class='ident'>M</span>: <span class='ident'>Mac</span><span class='op'>></span>(
<span class='ident'>mac</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>M</span>,
<span class='ident'>salt</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>],
<span class='ident'>c</span>: <span class='ident'>u32</span>,
<span class='ident'>idx</span>: <span class='ident'>u32</span>,
<span class='ident'>scratch</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>],
<span class='ident'>block</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='comment'>// Perform the 1st iteration. The output goes directly into block</span>
<span class='ident'>mac</span>.<span class='ident'>input</span>(<span class='ident'>salt</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>idx_buf</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>4</span>];
<span class='ident'>write_u32_be</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>idx_buf</span>, <span class='ident'>idx</span>);
<span class='ident'>mac</span>.<span class='ident'>input</span>(<span class='kw-2'>&</span><span class='ident'>idx_buf</span>);
<span class='ident'>mac</span>.<span class='ident'>raw_result</span>(<span class='ident'>block</span>);
<span class='ident'>mac</span>.<span class='ident'>reset</span>();
<span class='comment'>// Perform the 2nd iteration. The input comes from block and is output into scratch. scratch is</span>
<span class='comment'>// then exclusive-or added into block. After all this, the input to the next step is now in</span>
<span class='comment'>// scratch and block is left to just accumulate the exclusive-of sum of remaining iterations.</span>
<span class='kw'>if</span> <span class='ident'>c</span> <span class='op'>></span> <span class='number'>1</span> {
<span class='ident'>mac</span>.<span class='ident'>input</span>(<span class='ident'>block</span>);
<span class='ident'>mac</span>.<span class='ident'>raw_result</span>(<span class='ident'>scratch</span>);
<span class='ident'>mac</span>.<span class='ident'>reset</span>();
<span class='kw'>for</span> (<span class='ident'>output</span>, <span class='kw-2'>&</span><span class='ident'>input</span>) <span class='kw'>in</span> <span class='ident'>block</span>.<span class='ident'>iter_mut</span>().<span class='ident'>zip</span>(<span class='ident'>scratch</span>.<span class='ident'>iter</span>()) {
<span class='kw-2'>*</span><span class='ident'>output</span> <span class='op'>^=</span> <span class='ident'>input</span>;
}
}
<span class='comment'>// Perform all remaining iterations</span>
<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>2</span>..<span class='ident'>c</span> {
<span class='ident'>mac</span>.<span class='ident'>input</span>(<span class='ident'>scratch</span>);
<span class='ident'>mac</span>.<span class='ident'>raw_result</span>(<span class='ident'>scratch</span>);
<span class='ident'>mac</span>.<span class='ident'>reset</span>();
<span class='kw'>for</span> (<span class='ident'>output</span>, <span class='kw-2'>&</span><span class='ident'>input</span>) <span class='kw'>in</span> <span class='ident'>block</span>.<span class='ident'>iter_mut</span>().<span class='ident'>zip</span>(<span class='ident'>scratch</span>.<span class='ident'>iter</span>()) {
<span class='kw-2'>*</span><span class='ident'>output</span> <span class='op'>^=</span> <span class='ident'>input</span>;
}
}
}
<span class='doccomment'>/**
* Execute the PBKDF2 Key Derivation Function. The Scrypt Key Derivation Function generally provides
* better security, so, applications that do not have a requirement to use PBKDF2 specifically
* should consider using that function instead.
*
* # Arguments
* * mac - The Pseudo Random Function to use.
* * salt - The salt value to use.
* * c - The iteration count. Users should carefully determine this value as it is the primary
* factor in determining the security of the derived key.
* * output - The output buffer to fill with the derived key value.
*
*/</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>pbkdf2</span><span class='op'><</span><span class='ident'>M</span>: <span class='ident'>Mac</span><span class='op'>></span>(<span class='ident'>mac</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>M</span>, <span class='ident'>salt</span>: <span class='kw-2'>&</span>[<span class='ident'>u8</span>], <span class='ident'>c</span>: <span class='ident'>u32</span>, <span class='ident'>output</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> [<span class='ident'>u8</span>]) {
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>c</span> <span class='op'>></span> <span class='number'>0</span>);
<span class='kw'>let</span> <span class='ident'>os</span> <span class='op'>=</span> <span class='ident'>mac</span>.<span class='ident'>output_bytes</span>();
<span class='comment'>// A temporary storage array needed by calculate_block. This is really only necessary if c > 1.</span>
<span class='comment'>// Most users of pbkdf2 should use a value much larger than 1, so, this allocation should almost</span>
<span class='comment'>// always be necessary. A big exception is Scrypt. However, this allocation is unlikely to be</span>
<span class='comment'>// the bottleneck in Scrypt performance.</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>scratch</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>repeat</span>(<span class='number'>0</span>).<span class='ident'>take</span>(<span class='ident'>os</span>).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>idx</span>: <span class='ident'>u32</span> <span class='op'>=</span> <span class='number'>0</span>;
<span class='kw'>for</span> <span class='ident'>chunk</span> <span class='kw'>in</span> <span class='ident'>output</span>.<span class='ident'>chunks_mut</span>(<span class='ident'>os</span>) {
<span class='comment'>// The block index starts at 1. So, this is supposed to run on the first execution.</span>
<span class='ident'>idx</span> <span class='op'>=</span> <span class='ident'>idx</span>.<span class='ident'>checked_add</span>(<span class='number'>1</span>).<span class='ident'>expect</span>(<span class='string'>"PBKDF2 size limit exceeded."</span>);
<span class='kw'>if</span> <span class='ident'>chunk</span>.<span class='ident'>len</span>() <span class='op'>==</span> <span class='ident'>os</span> {
<span class='ident'>calculate_block</span>(<span class='ident'>mac</span>, <span class='ident'>salt</span>, <span class='ident'>c</span>, <span class='ident'>idx</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>scratch</span>, <span class='ident'>chunk</span>);
} <span class='kw'>else</span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>tmp</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>repeat</span>(<span class='number'>0</span>).<span class='ident'>take</span>(<span class='ident'>os</span>).<span class='ident'>collect</span>();
<span class='ident'>calculate_block</span>(<span class='ident'>mac</span>, <span class='ident'>salt</span>, <span class='ident'>c</span>, <span class='ident'>idx</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>scratch</span>[..], <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>tmp</span>[..]);
<span class='kw'>let</span> <span class='ident'>chunk_len</span> <span class='op'>=</span> <span class='ident'>chunk</span>.<span class='ident'>len</span>();
<span class='ident'>copy_memory</span>(<span class='kw-2'>&</span><span class='ident'>tmp</span>[..<span class='ident'>chunk_len</span>], <span class='ident'>chunk</span>);
}
}
}
<span class='doccomment'>/**
* pbkdf2_simple is a helper function that should be sufficient for the majority of cases where
* an application needs to use PBKDF2 to hash a password for storage. The result is a String that
* contains the parameters used as part of its encoding. The pbkdf2_check function may be used on
* a password to check if it is equal to a hashed value.
*
* # Format
*
* The format of the output is a modified version of the Modular Crypt Format that encodes algorithm
* used and iteration count. The format is indicated as "rpbkdf2" which is short for "Rust PBKF2
* format."
*
* $rpbkdf2$0$<base64(c)>$<base64(salt)>$<based64(hash)>$
*
* # Arguments
*
* * password - The password to process as a str
* * c - The iteration count
*
*/</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>pbkdf2_simple</span>(<span class='ident'>password</span>: <span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>c</span>: <span class='ident'>u32</span>) <span class='op'>-></span> <span class='ident'>io</span>::<span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>String</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>rng</span> <span class='op'>=</span> <span class='macro'>try</span><span class='macro'>!</span>(<span class='ident'>OsRng</span>::<span class='ident'>new</span>());
<span class='comment'>// 128-bit salt</span>
<span class='kw'>let</span> <span class='ident'>salt</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>rng</span>.<span class='ident'>gen_iter</span>::<span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>().<span class='ident'>take</span>(<span class='number'>16</span>).<span class='ident'>collect</span>();
<span class='comment'>// 256-bit derived key</span>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>dk</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>32</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>mac</span> <span class='op'>=</span> <span class='ident'>Hmac</span>::<span class='ident'>new</span>(<span class='ident'>Sha256</span>::<span class='ident'>new</span>(), <span class='ident'>password</span>.<span class='ident'>as_bytes</span>());
<span class='ident'>pbkdf2</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>mac</span>, <span class='kw-2'>&</span><span class='ident'>salt</span>[..], <span class='ident'>c</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>dk</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='string'>"$rpbkdf2$0$"</span>.<span class='ident'>to_string</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>tmp</span> <span class='op'>=</span> [<span class='number'>0u8</span>; <span class='number'>4</span>];
<span class='ident'>write_u32_be</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>tmp</span>, <span class='ident'>c</span>);
<span class='ident'>result</span>.<span class='ident'>push_str</span>(<span class='kw-2'>&</span><span class='ident'>tmp</span>.<span class='ident'>to_base64</span>(<span class='ident'>base64</span>::<span class='ident'>STANDARD</span>)[..]);
<span class='ident'>result</span>.<span class='ident'>push</span>(<span class='string'>'$'</span>);
<span class='ident'>result</span>.<span class='ident'>push_str</span>(<span class='kw-2'>&</span><span class='ident'>salt</span>.<span class='ident'>to_base64</span>(<span class='ident'>base64</span>::<span class='ident'>STANDARD</span>)[..]);
<span class='ident'>result</span>.<span class='ident'>push</span>(<span class='string'>'$'</span>);
<span class='ident'>result</span>.<span class='ident'>push_str</span>(<span class='kw-2'>&</span><span class='ident'>dk</span>.<span class='ident'>to_base64</span>(<span class='ident'>base64</span>::<span class='ident'>STANDARD</span>)[..]);
<span class='ident'>result</span>.<span class='ident'>push</span>(<span class='string'>'$'</span>);
<span class='prelude-val'>Ok</span>(<span class='ident'>result</span>)
}
<span class='doccomment'>/**
* pbkdf2_check compares a password against the result of a previous call to pbkdf2_simple and
* returns true if the passed in password hashes to the same value.
*
* # Arguments
*
* * password - The password to process as a str
* * hashed_value - A string representing a hashed password returned by pbkdf2_simple()
*
*/</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>pbkdf2_check</span>(<span class='ident'>password</span>: <span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>hashed_value</span>: <span class='kw-2'>&</span><span class='ident'>str</span>) <span class='op'>-></span> <span class='prelude-ty'>Result</span><span class='op'><</span><span class='ident'>bool</span>, <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span><span class='op'>></span> {
<span class='kw'>static</span> <span class='ident'>ERR_STR</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span> <span class='op'>=</span> <span class='string'>"Hash is not in Rust PBKDF2 format."</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>iter</span> <span class='op'>=</span> <span class='ident'>hashed_value</span>.<span class='ident'>split</span>(<span class='string'>'$'</span>);
<span class='comment'>// Check that there are no characters before the first "$"</span>
<span class='kw'>match</span> <span class='ident'>iter</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>(<span class='ident'>x</span>) <span class='op'>=></span> <span class='kw'>if</span> <span class='ident'>x</span> <span class='op'>!=</span> <span class='string'>""</span> { <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>); },
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
}
<span class='comment'>// Check the name</span>
<span class='kw'>match</span> <span class='ident'>iter</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>(<span class='ident'>t</span>) <span class='op'>=></span> <span class='kw'>if</span> <span class='ident'>t</span> <span class='op'>!=</span> <span class='string'>"rpbkdf2"</span> { <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>); },
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
}
<span class='comment'>// Parse format - currenlty only version 0 is supported</span>
<span class='kw'>match</span> <span class='ident'>iter</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>(<span class='ident'>fstr</span>) <span class='op'>=></span> {
<span class='kw'>match</span> <span class='ident'>fstr</span> {
<span class='string'>"0"</span> <span class='op'>=></span> { }
_ <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
}
}
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
}
<span class='comment'>// Parse the iteration count</span>
<span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>iter</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>(<span class='ident'>pstr</span>) <span class='op'>=></span> <span class='kw'>match</span> <span class='ident'>pstr</span>.<span class='ident'>from_base64</span>() {
<span class='prelude-val'>Ok</span>(<span class='ident'>pvec</span>) <span class='op'>=></span> {
<span class='kw'>if</span> <span class='ident'>pvec</span>.<span class='ident'>len</span>() <span class='op'>!=</span> <span class='number'>4</span> { <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>); }
<span class='ident'>read_u32_be</span>(<span class='kw-2'>&</span><span class='ident'>pvec</span>[..])
}
<span class='prelude-val'>Err</span>(_) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
},
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
};
<span class='comment'>// Salt</span>
<span class='kw'>let</span> <span class='ident'>salt</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>iter</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>(<span class='ident'>sstr</span>) <span class='op'>=></span> <span class='kw'>match</span> <span class='ident'>sstr</span>.<span class='ident'>from_base64</span>() {
<span class='prelude-val'>Ok</span>(<span class='ident'>salt</span>) <span class='op'>=></span> <span class='ident'>salt</span>,
<span class='prelude-val'>Err</span>(_) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
},
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
};
<span class='comment'>// Hashed value</span>
<span class='kw'>let</span> <span class='ident'>hash</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='ident'>iter</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>(<span class='ident'>hstr</span>) <span class='op'>=></span> <span class='kw'>match</span> <span class='ident'>hstr</span>.<span class='ident'>from_base64</span>() {
<span class='prelude-val'>Ok</span>(<span class='ident'>hash</span>) <span class='op'>=></span> <span class='ident'>hash</span>,
<span class='prelude-val'>Err</span>(_) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
},
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
};
<span class='comment'>// Make sure that the input ends with a "$"</span>
<span class='kw'>match</span> <span class='ident'>iter</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>(<span class='ident'>x</span>) <span class='op'>=></span> <span class='kw'>if</span> <span class='ident'>x</span> <span class='op'>!=</span> <span class='string'>""</span> { <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>); },
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>)
}
<span class='comment'>// Make sure there is no trailing data after the final "$"</span>
<span class='kw'>match</span> <span class='ident'>iter</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>(_) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Err</span>(<span class='ident'>ERR_STR</span>),
<span class='prelude-val'>None</span> <span class='op'>=></span> { }
}
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>mac</span> <span class='op'>=</span> <span class='ident'>Hmac</span>::<span class='ident'>new</span>(<span class='ident'>Sha256</span>::<span class='ident'>new</span>(), <span class='ident'>password</span>.<span class='ident'>as_bytes</span>());
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>output</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>repeat</span>(<span class='number'>0</span>).<span class='ident'>take</span>(<span class='ident'>hash</span>.<span class='ident'>len</span>()).<span class='ident'>collect</span>();
<span class='ident'>pbkdf2</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>mac</span>, <span class='kw-2'>&</span><span class='ident'>salt</span>[..], <span class='ident'>c</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>output</span>[..]);
<span class='comment'>// Be careful here - its important that the comparison be done using a fixed time equality</span>
<span class='comment'>// check. Otherwise an adversary that can measure how long this step takes can learn about the</span>
<span class='comment'>// hashed value which would allow them to mount an offline brute force attack against the</span>
<span class='comment'>// hashed password.</span>
<span class='prelude-val'>Ok</span>(<span class='ident'>fixed_time_eq</span>(<span class='kw-2'>&</span><span class='ident'>output</span>[..], <span class='kw-2'>&</span><span class='ident'>hash</span>[..]))
}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>test</span> {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>repeat</span>;
<span class='kw'>use</span> <span class='ident'>pbkdf2</span>::{<span class='ident'>pbkdf2</span>, <span class='ident'>pbkdf2_simple</span>, <span class='ident'>pbkdf2_check</span>};
<span class='kw'>use</span> <span class='ident'>hmac</span>::<span class='ident'>Hmac</span>;
<span class='kw'>use</span> <span class='ident'>sha1</span>::<span class='ident'>Sha1</span>;
<span class='kw'>struct</span> <span class='ident'>Test</span> {
<span class='ident'>password</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>,
<span class='ident'>salt</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>,
<span class='ident'>c</span>: <span class='ident'>u32</span>,
<span class='ident'>expected</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span>
}
<span class='comment'>// Test vectors from http://tools.ietf.org/html/rfc6070. The 4th test vector is omitted because</span>
<span class='comment'>// it takes too long to run.</span>
<span class='kw'>fn</span> <span class='ident'>tests</span>() <span class='op'>-></span> <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>Test</span><span class='op'>></span> {
<span class='macro'>vec</span><span class='macro'>!</span>[
<span class='ident'>Test</span> {
<span class='ident'>password</span>: <span class='string'>b"password"</span>.<span class='ident'>to_vec</span>(),
<span class='ident'>salt</span>: <span class='string'>b"salt"</span>.<span class='ident'>to_vec</span>(),
<span class='ident'>c</span>: <span class='number'>1</span>,
<span class='ident'>expected</span>: <span class='macro'>vec</span><span class='macro'>!</span>[
<span class='number'>0x0c</span>, <span class='number'>0x60</span>, <span class='number'>0xc8</span>, <span class='number'>0x0f</span>, <span class='number'>0x96</span>, <span class='number'>0x1f</span>, <span class='number'>0x0e</span>, <span class='number'>0x71</span>,
<span class='number'>0xf3</span>, <span class='number'>0xa9</span>, <span class='number'>0xb5</span>, <span class='number'>0x24</span>, <span class='number'>0xaf</span>, <span class='number'>0x60</span>, <span class='number'>0x12</span>, <span class='number'>0x06</span>,
<span class='number'>0x2f</span>, <span class='number'>0xe0</span>, <span class='number'>0x37</span>, <span class='number'>0xa6</span> ]
},
<span class='ident'>Test</span> {
<span class='ident'>password</span>: <span class='string'>b"password"</span>.<span class='ident'>to_vec</span>(),
<span class='ident'>salt</span>: <span class='string'>b"salt"</span>.<span class='ident'>to_vec</span>(),
<span class='ident'>c</span>: <span class='number'>2</span>,
<span class='ident'>expected</span>: <span class='macro'>vec</span><span class='macro'>!</span>[
<span class='number'>0xea</span>, <span class='number'>0x6c</span>, <span class='number'>0x01</span>, <span class='number'>0x4d</span>, <span class='number'>0xc7</span>, <span class='number'>0x2d</span>, <span class='number'>0x6f</span>, <span class='number'>0x8c</span>,
<span class='number'>0xcd</span>, <span class='number'>0x1e</span>, <span class='number'>0xd9</span>, <span class='number'>0x2a</span>, <span class='number'>0xce</span>, <span class='number'>0x1d</span>, <span class='number'>0x41</span>, <span class='number'>0xf0</span>,
<span class='number'>0xd8</span>, <span class='number'>0xde</span>, <span class='number'>0x89</span>, <span class='number'>0x57</span> ]
},
<span class='ident'>Test</span> {
<span class='ident'>password</span>: <span class='string'>b"password"</span>.<span class='ident'>to_vec</span>(),
<span class='ident'>salt</span>: <span class='string'>b"salt"</span>.<span class='ident'>to_vec</span>(),
<span class='ident'>c</span>: <span class='number'>4096</span>,
<span class='ident'>expected</span>: <span class='macro'>vec</span><span class='macro'>!</span>[
<span class='number'>0x4b</span>, <span class='number'>0x00</span>, <span class='number'>0x79</span>, <span class='number'>0x01</span>, <span class='number'>0xb7</span>, <span class='number'>0x65</span>, <span class='number'>0x48</span>, <span class='number'>0x9a</span>,
<span class='number'>0xbe</span>, <span class='number'>0xad</span>, <span class='number'>0x49</span>, <span class='number'>0xd9</span>, <span class='number'>0x26</span>, <span class='number'>0xf7</span>, <span class='number'>0x21</span>, <span class='number'>0xd0</span>,
<span class='number'>0x65</span>, <span class='number'>0xa4</span>, <span class='number'>0x29</span>, <span class='number'>0xc1</span> ]
},
<span class='ident'>Test</span> {
<span class='ident'>password</span>: <span class='string'>b"passwordPASSWORDpassword"</span>.<span class='ident'>to_vec</span>(),
<span class='ident'>salt</span>: <span class='string'>b"saltSALTsaltSALTsaltSALTsaltSALTsalt"</span>.<span class='ident'>to_vec</span>(),
<span class='ident'>c</span>: <span class='number'>4096</span>,
<span class='ident'>expected</span>: <span class='macro'>vec</span><span class='macro'>!</span>[
<span class='number'>0x3d</span>, <span class='number'>0x2e</span>, <span class='number'>0xec</span>, <span class='number'>0x4f</span>, <span class='number'>0xe4</span>, <span class='number'>0x1c</span>, <span class='number'>0x84</span>, <span class='number'>0x9b</span>,
<span class='number'>0x80</span>, <span class='number'>0xc8</span>, <span class='number'>0xd8</span>, <span class='number'>0x36</span>, <span class='number'>0x62</span>, <span class='number'>0xc0</span>, <span class='number'>0xe4</span>, <span class='number'>0x4a</span>,
<span class='number'>0x8b</span>, <span class='number'>0x29</span>, <span class='number'>0x1a</span>, <span class='number'>0x96</span>, <span class='number'>0x4c</span>, <span class='number'>0xf2</span>, <span class='number'>0xf0</span>, <span class='number'>0x70</span>, <span class='number'>0x38</span> ]
},
<span class='ident'>Test</span> {
<span class='ident'>password</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>112</span>, <span class='number'>97</span>, <span class='number'>115</span>, <span class='number'>115</span>, <span class='number'>0</span>, <span class='number'>119</span>, <span class='number'>111</span>, <span class='number'>114</span>, <span class='number'>100</span>],
<span class='ident'>salt</span>: <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>115</span>, <span class='number'>97</span>, <span class='number'>0</span>, <span class='number'>108</span>, <span class='number'>116</span>],
<span class='ident'>c</span>: <span class='number'>4096</span>,
<span class='ident'>expected</span>: <span class='macro'>vec</span><span class='macro'>!</span>[
<span class='number'>0x56</span>, <span class='number'>0xfa</span>, <span class='number'>0x6a</span>, <span class='number'>0xa7</span>, <span class='number'>0x55</span>, <span class='number'>0x48</span>, <span class='number'>0x09</span>, <span class='number'>0x9d</span>,
<span class='number'>0xcc</span>, <span class='number'>0x37</span>, <span class='number'>0xd7</span>, <span class='number'>0xf0</span>, <span class='number'>0x34</span>, <span class='number'>0x25</span>, <span class='number'>0xe0</span>, <span class='number'>0xc3</span> ]
}
]
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_pbkdf2</span>() {
<span class='kw'>let</span> <span class='ident'>tests</span> <span class='op'>=</span> <span class='ident'>tests</span>();
<span class='kw'>for</span> <span class='ident'>t</span> <span class='kw'>in</span> <span class='ident'>tests</span>.<span class='ident'>iter</span>() {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>mac</span> <span class='op'>=</span> <span class='ident'>Hmac</span>::<span class='ident'>new</span>(<span class='ident'>Sha1</span>::<span class='ident'>new</span>(), <span class='kw-2'>&</span><span class='ident'>t</span>.<span class='ident'>password</span>[..]);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>result</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>u8</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>repeat</span>(<span class='number'>0</span>).<span class='ident'>take</span>(<span class='ident'>t</span>.<span class='ident'>expected</span>.<span class='ident'>len</span>()).<span class='ident'>collect</span>();
<span class='ident'>pbkdf2</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>mac</span>, <span class='kw-2'>&</span><span class='ident'>t</span>.<span class='ident'>salt</span>[..], <span class='ident'>t</span>.<span class='ident'>c</span>, <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='ident'>result</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>result</span> <span class='op'>==</span> <span class='ident'>t</span>.<span class='ident'>expected</span>);
}
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>test_pbkdf2_simple</span>() {
<span class='kw'>let</span> <span class='ident'>password</span> <span class='op'>=</span> <span class='string'>"password"</span>;
<span class='kw'>let</span> <span class='ident'>out1</span> <span class='op'>=</span> <span class='ident'>pbkdf2_simple</span>(<span class='ident'>password</span>, <span class='number'>1024</span>).<span class='ident'>unwrap</span>();
<span class='kw'>let</span> <span class='ident'>out2</span> <span class='op'>=</span> <span class='ident'>pbkdf2_simple</span>(<span class='ident'>password</span>, <span class='number'>1024</span>).<span class='ident'>unwrap</span>();
<span class='comment'>// This just makes sure that a salt is being applied. It doesn't verify that that salt is</span>
<span class='comment'>// cryptographically strong, however.</span>
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>out1</span> <span class='op'>!=</span> <span class='ident'>out2</span>);
<span class='kw'>match</span> <span class='ident'>pbkdf2_check</span>(<span class='ident'>password</span>, <span class='kw-2'>&</span><span class='ident'>out1</span>[..]) {
<span class='prelude-val'>Ok</span>(<span class='ident'>r</span>) <span class='op'>=></span> <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>r</span>),
<span class='prelude-val'>Err</span>(_) <span class='op'>=></span> <span class='macro'>panic</span><span class='macro'>!</span>()
}
<span class='kw'>match</span> <span class='ident'>pbkdf2_check</span>(<span class='ident'>password</span>, <span class='kw-2'>&</span><span class='ident'>out2</span>[..]) {
<span class='prelude-val'>Ok</span>(<span class='ident'>r</span>) <span class='op'>=></span> <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>r</span>),
<span class='prelude-val'>Err</span>(_) <span class='op'>=></span> <span class='macro'>panic</span><span class='macro'>!</span>()
}
<span class='kw'>match</span> <span class='ident'>pbkdf2_check</span>(<span class='string'>"wrong"</span>, <span class='kw-2'>&</span><span class='ident'>out1</span>[..]) {
<span class='prelude-val'>Ok</span>(<span class='ident'>r</span>) <span class='op'>=></span> <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>r</span>),
<span class='prelude-val'>Err</span>(_) <span class='op'>=></span> <span class='macro'>panic</span><span class='macro'>!</span>()
}
<span class='kw'>match</span> <span class='ident'>pbkdf2_check</span>(<span class='string'>"wrong"</span>, <span class='kw-2'>&</span><span class='ident'>out2</span>[..]) {
<span class='prelude-val'>Ok</span>(<span class='ident'>r</span>) <span class='op'>=></span> <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>r</span>),
<span class='prelude-val'>Err</span>(_) <span class='op'>=></span> <span class='macro'>panic</span><span class='macro'>!</span>()
}
}
}
</pre>
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