Jason Tudisco
360ecbdad0
CAN Service: content-addressable storage with HTTP API, SQLite metadata, file-based blob storage, thumbnail generation, and integrity verification. can-sync v1: P2P sync sidecar using iroh-docs for encrypted peer-to-peer replication with library/filter-based selective sync. Fully builds but being superseded by v2 (simplified full-mirror approach). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
49 lines
1.4 KiB
Rust
49 lines
1.4 KiB
Rust
use sha2::{Digest, Sha256};
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/// Compute SHA-256 hash as: SHA256(timestamp_bytes + content_bytes).
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/// The timestamp is serialized as its string representation's bytes,
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/// matching the spec: `SHA256([timestamp_bytes] + [raw_file_content_bytes])`.
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pub fn compute_hash(timestamp_ms: i64, content: &[u8]) -> String {
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let mut hasher = Sha256::new();
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hasher.update(timestamp_ms.to_be_bytes());
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hasher.update(content);
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hex::encode(hasher.finalize())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_deterministic_hash() {
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let ts = 1773014400123i64;
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let content = b"hello world";
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let h1 = compute_hash(ts, content);
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let h2 = compute_hash(ts, content);
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assert_eq!(h1, h2);
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assert_eq!(h1.len(), 64); // SHA-256 hex = 64 chars
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}
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#[test]
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fn test_different_timestamp_different_hash() {
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let content = b"same content";
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let h1 = compute_hash(1000, content);
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let h2 = compute_hash(2000, content);
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assert_ne!(h1, h2);
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}
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#[test]
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fn test_different_content_different_hash() {
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let ts = 1234567890i64;
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let h1 = compute_hash(ts, b"content A");
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let h2 = compute_hash(ts, b"content B");
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assert_ne!(h1, h2);
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}
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#[test]
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fn test_empty_content() {
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let h = compute_hash(0, b"");
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assert_eq!(h.len(), 64);
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}
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}
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