keyhog-scanner 0.5.85

keyhog-scanner: high-performance SIMD-accelerated secret detection engine
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use super::*;

#[test]
fn hex_decode_empty_and_valid_cases() {
    assert_eq!(hex_decode("").unwrap(), Vec::<u8>::new());
    assert_eq!(hex_decode("48656c6c6f").unwrap(), b"Hello");
    assert_eq!(hex_decode("48656C6C6F").unwrap(), b"Hello");
    assert_eq!(
        hex_decode("deadbeef").unwrap(),
        vec![0xde, 0xad, 0xbe, 0xef]
    );
    assert_eq!(
        hex_decode("de_ad_be_ef").unwrap(),
        vec![0xde, 0xad, 0xbe, 0xef]
    );
}

#[test]
fn hex_decode_rejects_malformed_and_odd_sequences() {
    assert!(hex_decode("a").is_err());
    assert!(hex_decode("abc").is_err());
    assert!(hex_decode("12345").is_err());
    assert!(hex_decode("gg41").is_err());
    assert!(hex_decode("41gg").is_err());
    assert!(hex_decode("48é6").is_err());
    assert!(hex_decode("41_4").is_err());
    assert!(hex_decode("41_zz").is_err());
}

#[test]
fn hex_decode_to_stack_buf_validates_16_byte_hashes() {
    let md5_hex = "d41d8cd98f00b204e9800998ecf8427e";
    let mut dst = [0u8; 128];
    let len = hex_decode_to_stack_buf(md5_hex, &mut dst).expect("valid 16-byte hash must decode");
    assert_eq!(len, 16);
    assert_eq!(
        &dst[..16],
        &[
            0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04, 0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8,
            0x42, 0x7e
        ]
    );

    let md5_with_underscores = "d4_1d_8c_d9_8f_00_b2_04_e9_80_09_98_ec_f8_42_7e";
    let mut dst_underscores = [0u8; 128];
    let len_underscores = hex_decode_to_stack_buf(md5_with_underscores, &mut dst_underscores)
        .expect("underscore-separated 16-byte hash must decode");
    assert_eq!(len_underscores, 16);
    assert_eq!(&dst_underscores[..16], &dst[..16]);

    // Rejections: odd length or non-hex
    assert!(hex_decode_to_stack_buf("d41d8cd98f00b204e9800998ecf8427", &mut dst).is_err());
    assert!(hex_decode_to_stack_buf("d41d8cd98f00b204e9800998ecf842zz", &mut dst).is_err());
}

#[test]
fn hex_decode_to_stack_buf_validates_32_byte_hashes() {
    let sha256_hex = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
    let mut dst = [0u8; 128];
    let len =
        hex_decode_to_stack_buf(sha256_hex, &mut dst).expect("valid 32-byte hash must decode");
    assert_eq!(len, 32);
    assert_eq!(dst[0], 0xe3);
    assert_eq!(dst[31], 0x55);

    let sha256_underscores =
        "e3b0c442_98fc1c14_9afbf4c8_996fb924_27ae41e4_649b934c_a495991b_7852b855";
    let mut dst_underscores = [0u8; 128];
    let len_underscores = hex_decode_to_stack_buf(sha256_underscores, &mut dst_underscores)
        .expect("underscore-separated 32-byte hash must decode");
    assert_eq!(len_underscores, 32);
    assert_eq!(&dst_underscores[..32], &dst[..32]);

    // Rejections: odd length or non-hex
    assert!(hex_decode_to_stack_buf(
        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b85",
        &mut dst
    )
    .is_err());
    assert!(hex_decode_to_stack_buf(
        "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b8zz",
        &mut dst
    )
    .is_err());
}

#[test]
fn try_decode_hex_candidate_utf8_fast_path() {
    // Text hex decodes to valid UTF-8 string
    assert_eq!(
        try_decode_hex_candidate_to_utf8("48656c6c6f").as_deref(),
        Some("Hello")
    );
    assert_eq!(
        try_decode_hex_candidate_to_utf8("73_6b_2d_70_72_6f_6a").as_deref(),
        Some("sk-proj")
    );

    // Binary hashes (random cryptographic digests) fail UTF-8 check and return None
    // without allocating heap Strings.
    let md5_hex = "d41d8cd98f00b204e9800998ecf8427e";
    assert_eq!(try_decode_hex_candidate_to_utf8(md5_hex), None);

    let sha256_hex = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
    assert_eq!(try_decode_hex_candidate_to_utf8(sha256_hex), None);

    // Malformed inputs return None
    assert_eq!(try_decode_hex_candidate_to_utf8("abc"), None);
    assert_eq!(try_decode_hex_candidate_to_utf8("zz41"), None);
}
#[test]
fn hex_decode_handles_separator_heavy_large_input() {
    let mut input = String::with_capacity(2000);
    for _ in 0..300 {
        input.push_str("___41___42___");
    }
    let decoded = hex_decode(&input).expect("separator-heavy hex should decode");
    assert_eq!(decoded.len(), 600);
    assert_eq!(&decoded[..2], b"AB");
}