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Rust: Address result duplication in rust/hard-coded-cryptographic-value #22426

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Merged
geoffw0 merged 6 commits into from
Aug 27, 2026
Merged

Rust: Address result duplication in rust/hard-coded-cryptographic-value #22426

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e9ab160
Rust: Add a test case for rust/hard-coded-cryptographic-value.
geoffw0 Aug 25, 2026
73c4427
Rust: Fix near duplicate results.
geoffw0 Aug 25, 2026
d15895c
Rust: Change note.
geoffw0 Aug 25, 2026
fcdb89c
Rust: Rename isConstant -> hasConstant.
geoffw0 Aug 26, 2026
c0baa61
Rust: Additional test case for arrays.
geoffw0 Aug 26, 2026
02d670a
Rust: Make hasConstant behaviour on arrays consistent.
geoffw0 Aug 26, 2026
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22 changes: 15 additions & 7 deletions rust/ql/lib/codeql/rust/security/HardcodedCryptographicValueExtensions.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -62,14 +62,22 @@ module HardcodedCryptographicValue {
abstract class Barrier extends DataFlow::Node { }

/**
* Holds if `e` is a literal or a combination of literals that is constant.
* Holds if `e` is a literal or an expression that contains a constant. For example:
* ```
* ["hello", "world", s]
* ```
*/
private predicate isConstant(Expr e) {
private predicate hasConstant(Expr e) {
e instanceof LiteralExpr // e.g. `0`
or
forex(Expr elem | elem = e.(ArrayListExpr).getExpr(_) | isConstant(elem)) // e.g. `[0, 0, 0, 0]`
exists(Expr elem | elem = e.(ArrayListExpr).getExpr(_) | hasConstant(elem)) // e.g. `[0, 0, 0, 0]`
or
isConstant(e.(ArrayRepeatExpr).getRepeatOperand()) // e.g. `[0; 10]`
hasConstant(e.(ArrayRepeatExpr).getRepeatOperand()) // e.g. `[0; 10]`
or
// a match expression with one or more constant arms; taint would reach here
// anyway, but we make it a source to avoid reporting many similar results
// on each match arm.
hasConstant(e.(MatchExpr).getMatchArmList().getAnArm().getExpr())
or
// e.g. `const MY_CONST: u64 = ...`
// the constant initializer / body is the preferred source location for flow paths, when available.
Expand All @@ -81,15 +89,15 @@ module HardcodedCryptographicValue {
not exists(e.(ConstAccess).getConst().getBody())
or
// e.g. `1 << 4`
isConstant(e.(BinaryExpr).getLhs()) and
isConstant(e.(BinaryExpr).getRhs())
hasConstant(e.(BinaryExpr).getLhs()) and
hasConstant(e.(BinaryExpr).getRhs())
}

/**
* A constant, considered as a flow source.
*/
private class ConstantSource extends Source {
ConstantSource() { isConstant(this.asExpr()) }
ConstantSource() { hasConstant(this.asExpr()) }
}

/**
Expand Down
5 changes: 5 additions & 0 deletions rust/ql/src/change-notes/2026-08-25-hardcoded-cryptographic-match-expressions.md
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@@ -0,0 +1,5 @@
---
category: minorAnalysis
---
* The `rust/hard-coded-cryptographic-value` query has been adjusted to produce
fewer results in certain situations where many results were being produced with very similar source locations.
77 changes: 49 additions & 28 deletions rust/ql/test/query-tests/security/CWE-798/HardcodedCryptographicValue.expected
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,10 @@
| test_cipher.rs:73:19:73:26 | [0u8; 32] | test_cipher.rs:73:19:73:26 | [0u8; 32] | test_cipher.rs:74:46:74:51 | const2 | This hard-coded value is used as $@. | test_cipher.rs:74:46:74:51 | const2 | a key |
| test_cookie.rs:17:28:17:34 | [0; 64] | test_cookie.rs:17:28:17:34 | [0; 64] | test_cookie.rs:18:26:18:32 | &array1 | This hard-coded value is used as $@. | test_cookie.rs:18:26:18:32 | &array1 | a key |
| test_cookie.rs:21:28:21:34 | [0; 64] | test_cookie.rs:21:28:21:34 | [0; 64] | test_cookie.rs:22:26:22:32 | &array2 | This hard-coded value is used as $@. | test_cookie.rs:22:26:22:32 | &array2 | a key |
| test_cookie.rs:38:28:38:36 | [0u8; 64] | test_cookie.rs:38:28:38:36 | [0u8; 64] | test_cookie.rs:42:34:42:39 | array2 | This hard-coded value is used as $@. | test_cookie.rs:42:34:42:39 | array2 | a key |
| test_cookie.rs:49:23:49:25 | 0u8 | test_cookie.rs:49:23:49:25 | 0u8 | test_cookie.rs:53:34:53:39 | array3 | This hard-coded value is used as $@. | test_cookie.rs:53:34:53:39 | array3 | a key |
| test_cookie.rs:25:16:29:5 | match ... { ... } | test_cookie.rs:25:16:29:5 | match ... { ... } | test_cookie.rs:30:26:30:40 | str3.as_bytes() | This hard-coded value is used as $@. | test_cookie.rs:30:26:30:40 | str3.as_bytes() | a key |
| test_cookie.rs:33:27:37:5 | [...] | test_cookie.rs:33:27:37:5 | [...] | test_cookie.rs:38:26:38:32 | &array4 | This hard-coded value is used as $@. | test_cookie.rs:38:26:38:32 | &array4 | a key |
| test_cookie.rs:54:28:54:36 | [0u8; 64] | test_cookie.rs:54:28:54:36 | [0u8; 64] | test_cookie.rs:58:34:58:39 | array2 | This hard-coded value is used as $@. | test_cookie.rs:58:34:58:39 | array2 | a key |
| test_cookie.rs:65:23:65:25 | 0u8 | test_cookie.rs:65:23:65:25 | 0u8 | test_cookie.rs:69:34:69:39 | array3 | This hard-coded value is used as $@. | test_cookie.rs:69:34:69:39 | array3 | a key |
| test_heuristic.rs:38:25:38:30 | 0xFFFF | test_heuristic.rs:38:25:38:30 | 0xFFFF | test_heuristic.rs:81:22:81:31 | MY_CONST_1 | This hard-coded value is used as $@. | test_heuristic.rs:81:22:81:31 | MY_CONST_1 | a salt |
| test_heuristic.rs:39:25:39:59 | ... as u64 | test_heuristic.rs:39:25:39:59 | ... as u64 | test_heuristic.rs:82:22:82:31 | MY_CONST_2 | This hard-coded value is used as $@. | test_heuristic.rs:82:22:82:31 | MY_CONST_2 | a salt |
| test_heuristic.rs:40:27:40:32 | 0xFFFF | test_heuristic.rs:40:27:40:32 | 0xFFFF | test_heuristic.rs:83:22:83:32 | MY_STATIC_3 | This hard-coded value is used as $@. | test_heuristic.rs:83:22:83:32 | MY_STATIC_3 | a salt |
Expand All @@ -28,31 +30,31 @@ edges
| test_cipher.rs:18:28:18:36 | &... [&ref] | test_cipher.rs:18:9:18:14 | const1 [&ref] | provenance | |
| test_cipher.rs:18:29:18:36 | [0u8; 16] | test_cipher.rs:18:28:18:36 | &... [&ref] | provenance | |
| test_cipher.rs:19:49:19:79 | ...::from_slice(...) [&ref] | test_cipher.rs:19:49:19:79 | ...::from_slice(...) | provenance | Sink:MaD:2 |
| test_cipher.rs:19:73:19:78 | const1 [&ref] | test_cipher.rs:19:49:19:79 | ...::from_slice(...) [&ref] | provenance | MaD:13 |
| test_cipher.rs:19:73:19:78 | const1 [&ref] | test_cipher.rs:19:49:19:79 | ...::from_slice(...) [&ref] | provenance | MaD:14 |
| test_cipher.rs:25:9:25:14 | const4 [&ref] | test_cipher.rs:26:66:26:71 | const4 [&ref] | provenance | |
| test_cipher.rs:25:28:25:36 | &... [&ref] | test_cipher.rs:25:9:25:14 | const4 [&ref] | provenance | |
| test_cipher.rs:25:29:25:36 | [0u8; 16] | test_cipher.rs:25:28:25:36 | &... [&ref] | provenance | |
| test_cipher.rs:26:42:26:72 | ...::from_slice(...) [&ref] | test_cipher.rs:26:42:26:72 | ...::from_slice(...) | provenance | Sink:MaD:3 |
| test_cipher.rs:26:66:26:71 | const4 [&ref] | test_cipher.rs:26:42:26:72 | ...::from_slice(...) [&ref] | provenance | MaD:13 |
| test_cipher.rs:26:66:26:71 | const4 [&ref] | test_cipher.rs:26:42:26:72 | ...::from_slice(...) [&ref] | provenance | MaD:14 |
| test_cipher.rs:29:9:29:14 | const5 [&ref] | test_cipher.rs:30:95:30:100 | const5 [&ref] | provenance | |
| test_cipher.rs:29:28:29:36 | &... [&ref] | test_cipher.rs:29:9:29:14 | const5 [&ref] | provenance | |
| test_cipher.rs:29:29:29:36 | [0u8; 16] | test_cipher.rs:29:28:29:36 | &... [&ref] | provenance | |
| test_cipher.rs:30:72:30:101 | ...::from_slice(...) [&ref] | test_cipher.rs:30:72:30:101 | ...::from_slice(...) | provenance | Sink:MaD:4 |
| test_cipher.rs:30:95:30:100 | const5 [&ref] | test_cipher.rs:30:72:30:101 | ...::from_slice(...) [&ref] | provenance | MaD:13 |
| test_cipher.rs:30:95:30:100 | const5 [&ref] | test_cipher.rs:30:72:30:101 | ...::from_slice(...) [&ref] | provenance | MaD:14 |
| test_cipher.rs:37:9:37:14 | const7 | test_cipher.rs:38:74:38:79 | const7 | provenance | |
| test_cipher.rs:37:27:37:74 | [...] | test_cipher.rs:37:9:37:14 | const7 | provenance | |
| test_cipher.rs:38:49:38:80 | ...::from_slice(...) [&ref] | test_cipher.rs:38:49:38:80 | ...::from_slice(...) | provenance | Sink:MaD:2 |
| test_cipher.rs:38:73:38:79 | &const7 [&ref] | test_cipher.rs:38:49:38:80 | ...::from_slice(...) [&ref] | provenance | MaD:13 |
| test_cipher.rs:38:73:38:79 | &const7 [&ref] | test_cipher.rs:38:49:38:80 | ...::from_slice(...) [&ref] | provenance | MaD:14 |
| test_cipher.rs:38:74:38:79 | const7 | test_cipher.rs:38:73:38:79 | &const7 [&ref] | provenance | |
| test_cipher.rs:41:9:41:14 | const8 [&ref] | test_cipher.rs:42:73:42:78 | const8 [&ref] | provenance | |
| test_cipher.rs:41:28:41:76 | &... [&ref] | test_cipher.rs:41:9:41:14 | const8 [&ref] | provenance | |
| test_cipher.rs:41:29:41:76 | [...] | test_cipher.rs:41:28:41:76 | &... [&ref] | provenance | |
| test_cipher.rs:42:49:42:79 | ...::from_slice(...) [&ref] | test_cipher.rs:42:49:42:79 | ...::from_slice(...) | provenance | Sink:MaD:2 |
| test_cipher.rs:42:73:42:78 | const8 [&ref] | test_cipher.rs:42:49:42:79 | ...::from_slice(...) [&ref] | provenance | MaD:13 |
| test_cipher.rs:42:73:42:78 | const8 [&ref] | test_cipher.rs:42:49:42:79 | ...::from_slice(...) [&ref] | provenance | MaD:14 |
| test_cipher.rs:50:9:50:15 | const10 [element] | test_cipher.rs:51:75:51:81 | const10 [element] | provenance | |
| test_cipher.rs:50:37:50:54 | ...::zeroed(...) | test_cipher.rs:50:9:50:15 | const10 [element] | provenance | Src:MaD:7 |
| test_cipher.rs:51:50:51:82 | ...::from_slice(...) [&ref, element] | test_cipher.rs:51:50:51:82 | ...::from_slice(...) | provenance | Sink:MaD:2 Sink:MaD:2 |
| test_cipher.rs:51:74:51:81 | &const10 [&ref, element] | test_cipher.rs:51:50:51:82 | ...::from_slice(...) [&ref, element] | provenance | MaD:13 |
| test_cipher.rs:51:74:51:81 | &const10 [&ref, element] | test_cipher.rs:51:50:51:82 | ...::from_slice(...) [&ref, element] | provenance | MaD:14 |
| test_cipher.rs:51:75:51:81 | const10 [element] | test_cipher.rs:51:74:51:81 | &const10 [&ref, element] | provenance | |
| test_cipher.rs:73:9:73:14 | const2 [&ref] | test_cipher.rs:74:46:74:51 | const2 | provenance | Sink:MaD:6 |
| test_cipher.rs:73:18:73:26 | &... [&ref] | test_cipher.rs:73:9:73:14 | const2 [&ref] | provenance | |
Expand All @@ -65,16 +67,24 @@ edges
| test_cookie.rs:21:28:21:34 | [0; 64] | test_cookie.rs:21:9:21:14 | array2 | provenance | |
| test_cookie.rs:22:26:22:32 | &array2 [&ref] | test_cookie.rs:22:26:22:32 | &array2 | provenance | Sink:MaD:5 |
| test_cookie.rs:22:27:22:32 | array2 | test_cookie.rs:22:26:22:32 | &array2 [&ref] | provenance | |
| test_cookie.rs:38:9:38:14 | array2 | test_cookie.rs:42:34:42:39 | array2 | provenance | Sink:MaD:1 |
| test_cookie.rs:38:18:38:37 | ...::from(...) | test_cookie.rs:38:9:38:14 | array2 | provenance | |
| test_cookie.rs:38:28:38:36 | [0u8; 64] | test_cookie.rs:38:18:38:37 | ...::from(...) | provenance | MaD:8 |
| test_cookie.rs:38:28:38:36 | [0u8; 64] | test_cookie.rs:38:18:38:37 | ...::from(...) | provenance | MaD:9 |
| test_cookie.rs:38:28:38:36 | [0u8; 64] | test_cookie.rs:38:18:38:37 | ...::from(...) | provenance | MaD:10 |
| test_cookie.rs:38:28:38:36 | [0u8; 64] | test_cookie.rs:38:18:38:37 | ...::from(...) | provenance | MaD:11 |
| test_cookie.rs:38:28:38:36 | [0u8; 64] | test_cookie.rs:38:18:38:37 | ...::from(...) | provenance | MaD:12 |
| test_cookie.rs:49:9:49:14 | array3 [element] | test_cookie.rs:53:34:53:39 | array3 | provenance | Sink:MaD:1 |
| test_cookie.rs:49:23:49:25 | 0u8 | test_cookie.rs:49:23:49:29 | ...::from_elem(...) [element] | provenance | MaD:14 |
| test_cookie.rs:49:23:49:29 | ...::from_elem(...) [element] | test_cookie.rs:49:9:49:14 | array3 [element] | provenance | |
| test_cookie.rs:25:9:25:12 | str3 | test_cookie.rs:30:26:30:29 | str3 | provenance | |
| test_cookie.rs:25:16:29:5 | match ... { ... } | test_cookie.rs:25:9:25:12 | str3 | provenance | |
| test_cookie.rs:30:26:30:29 | str3 | test_cookie.rs:30:26:30:40 | str3.as_bytes() [&ref] | provenance | MaD:13 |
| test_cookie.rs:30:26:30:40 | str3.as_bytes() [&ref] | test_cookie.rs:30:26:30:40 | str3.as_bytes() | provenance | Sink:MaD:5 |
| test_cookie.rs:33:9:33:14 | array4 | test_cookie.rs:38:27:38:32 | array4 | provenance | |
| test_cookie.rs:33:27:37:5 | [...] | test_cookie.rs:33:9:33:14 | array4 | provenance | |
| test_cookie.rs:38:26:38:32 | &array4 [&ref] | test_cookie.rs:38:26:38:32 | &array4 | provenance | Sink:MaD:5 |
| test_cookie.rs:38:27:38:32 | array4 | test_cookie.rs:38:26:38:32 | &array4 [&ref] | provenance | |
| test_cookie.rs:54:9:54:14 | array2 | test_cookie.rs:58:34:58:39 | array2 | provenance | Sink:MaD:1 |
| test_cookie.rs:54:18:54:37 | ...::from(...) | test_cookie.rs:54:9:54:14 | array2 | provenance | |
| test_cookie.rs:54:28:54:36 | [0u8; 64] | test_cookie.rs:54:18:54:37 | ...::from(...) | provenance | MaD:8 |
| test_cookie.rs:54:28:54:36 | [0u8; 64] | test_cookie.rs:54:18:54:37 | ...::from(...) | provenance | MaD:9 |
| test_cookie.rs:54:28:54:36 | [0u8; 64] | test_cookie.rs:54:18:54:37 | ...::from(...) | provenance | MaD:10 |
| test_cookie.rs:54:28:54:36 | [0u8; 64] | test_cookie.rs:54:18:54:37 | ...::from(...) | provenance | MaD:11 |
| test_cookie.rs:54:28:54:36 | [0u8; 64] | test_cookie.rs:54:18:54:37 | ...::from(...) | provenance | MaD:12 |
| test_cookie.rs:65:9:65:14 | array3 [element] | test_cookie.rs:69:34:69:39 | array3 | provenance | Sink:MaD:1 |
| test_cookie.rs:65:23:65:25 | 0u8 | test_cookie.rs:65:23:65:29 | ...::from_elem(...) [element] | provenance | MaD:15 |
| test_cookie.rs:65:23:65:29 | ...::from_elem(...) [element] | test_cookie.rs:65:9:65:14 | array3 [element] | provenance | |
| test_heuristic.rs:38:25:38:30 | 0xFFFF | test_heuristic.rs:81:22:81:31 | MY_CONST_1 | provenance | |
| test_heuristic.rs:39:25:39:59 | ... as u64 | test_heuristic.rs:82:22:82:31 | MY_CONST_2 | provenance | |
| test_heuristic.rs:39:62:40:33 | static MY_STATIC_3 | test_heuristic.rs:83:22:83:32 | MY_STATIC_3 | provenance | |
Expand All @@ -99,8 +109,9 @@ models
| 10 | Summary: <alloc::vec::Vec as core::convert::From>::from; Argument[0].Field[alloc::collections::binary_heap::BinaryHeap::data]; ReturnValue; value |
| 11 | Summary: <alloc::vec::Vec as core::convert::From>::from; Argument[0].Field[alloc::string::String::vec]; ReturnValue; value |
| 12 | Summary: <alloc::vec::Vec as core::convert::From>::from; Argument[0]; ReturnValue; taint |
| 13 | Summary: <generic_array::GenericArray>::from_slice; Argument[0].Reference; ReturnValue.Reference; value |
| 14 | Summary: alloc::vec::from_elem; Argument[0]; ReturnValue.Element; value |
| 13 | Summary: <core::str>::as_bytes; Argument[self].Reference; ReturnValue.Reference; taint |
| 14 | Summary: <generic_array::GenericArray>::from_slice; Argument[0].Reference; ReturnValue.Reference; value |
| 15 | Summary: alloc::vec::from_elem; Argument[0]; ReturnValue.Element; value |
nodes
| test_cipher.rs:18:9:18:14 | const1 [&ref] | semmle.label | const1 [&ref] |
| test_cipher.rs:18:28:18:36 | &... [&ref] | semmle.label | &... [&ref] |
Expand Down Expand Up @@ -152,14 +163,24 @@ nodes
| test_cookie.rs:22:26:22:32 | &array2 | semmle.label | &array2 |
| test_cookie.rs:22:26:22:32 | &array2 [&ref] | semmle.label | &array2 [&ref] |
| test_cookie.rs:22:27:22:32 | array2 | semmle.label | array2 |
| test_cookie.rs:38:9:38:14 | array2 | semmle.label | array2 |
| test_cookie.rs:38:18:38:37 | ...::from(...) | semmle.label | ...::from(...) |
| test_cookie.rs:38:28:38:36 | [0u8; 64] | semmle.label | [0u8; 64] |
| test_cookie.rs:42:34:42:39 | array2 | semmle.label | array2 |
| test_cookie.rs:49:9:49:14 | array3 [element] | semmle.label | array3 [element] |
| test_cookie.rs:49:23:49:25 | 0u8 | semmle.label | 0u8 |
| test_cookie.rs:49:23:49:29 | ...::from_elem(...) [element] | semmle.label | ...::from_elem(...) [element] |
| test_cookie.rs:53:34:53:39 | array3 | semmle.label | array3 |
| test_cookie.rs:25:9:25:12 | str3 | semmle.label | str3 |
| test_cookie.rs:25:16:29:5 | match ... { ... } | semmle.label | match ... { ... } |
| test_cookie.rs:30:26:30:29 | str3 | semmle.label | str3 |
| test_cookie.rs:30:26:30:40 | str3.as_bytes() | semmle.label | str3.as_bytes() |
| test_cookie.rs:30:26:30:40 | str3.as_bytes() [&ref] | semmle.label | str3.as_bytes() [&ref] |
| test_cookie.rs:33:9:33:14 | array4 | semmle.label | array4 |
| test_cookie.rs:33:27:37:5 | [...] | semmle.label | [...] |
| test_cookie.rs:38:26:38:32 | &array4 | semmle.label | &array4 |
| test_cookie.rs:38:26:38:32 | &array4 [&ref] | semmle.label | &array4 [&ref] |
| test_cookie.rs:38:27:38:32 | array4 | semmle.label | array4 |
| test_cookie.rs:54:9:54:14 | array2 | semmle.label | array2 |
| test_cookie.rs:54:18:54:37 | ...::from(...) | semmle.label | ...::from(...) |
| test_cookie.rs:54:28:54:36 | [0u8; 64] | semmle.label | [0u8; 64] |
| test_cookie.rs:58:34:58:39 | array2 | semmle.label | array2 |
| test_cookie.rs:65:9:65:14 | array3 [element] | semmle.label | array3 [element] |
| test_cookie.rs:65:23:65:25 | 0u8 | semmle.label | 0u8 |
| test_cookie.rs:65:23:65:29 | ...::from_elem(...) [element] | semmle.label | ...::from_elem(...) [element] |
| test_cookie.rs:69:34:69:39 | array3 | semmle.label | array3 |
| test_heuristic.rs:38:25:38:30 | 0xFFFF | semmle.label | 0xFFFF |
| test_heuristic.rs:39:25:39:59 | ... as u64 | semmle.label | ... as u64 |
| test_heuristic.rs:39:62:40:33 | static MY_STATIC_3 | semmle.label | static MY_STATIC_3 |
Expand Down
18 changes: 17 additions & 1 deletion rust/ql/test/query-tests/security/CWE-798/test_cookie.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@ use cookie::{CookieJar, SignedJar, PrivateJar, Key};

// --- tests ---

fn test_cookie_jar(array_var: &[u8]) {
fn test_cookie_jar(array_var: &[u8], val: u64) {
let mut jar = CookieJar::new();

let key_generate = Key::generate(); // good
Expand All @@ -21,6 +21,22 @@ fn test_cookie_jar(array_var: &[u8]) {
let array2: [u8; 64] = [0; 64]; // $ Alert[rust/hard-coded-cryptographic-value]
let key2 = Key::from(&array2); // $ Sink
_ = jar.private_mut(&key2);

let str3 = match(val) {
0 => "one",
1 => "two",
_ => "many"
}; // $ Alert[rust/hard-coded-cryptographic-value]
let key3 = Key::from(str3.as_bytes()); // $ Sink
_ = jar.signed_mut(&key3);

let array4: [u8; 3] = [
1,
2,
val as u8
]; // $ Alert[rust/hard-coded-cryptographic-value]
let key4 = Key::from(&array4); // $ Sink
_ = jar.signed_mut(&key4);
}

fn test_biscotti_crypto(array_var: &[u8]) {
Expand Down
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