spark: Add file hash calculator utility supporting sha256, md5, sha1, sha512, blake2b, blake2s, crc32

wizard-work/spark/file_hash.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+"""
+File Hash Calculator - Computes cryptographic hashes for files.
+Supports: sha256, sha1, sha512, md5, blake2b, blake2s, crc32
+"""
+import argparse
+import hashlib
+import binascii
+import sys
+from pathlib import Path
+
+
+def compute_hash(filepath: str, algorithm: str = "sha256", buffer_size: int = 65536) -> str:
+    """Compute hash of a file using specified algorithm."""
+    algorithms = {
+        "sha256": hashlib.sha256,
+        "sha1": hashlib.sha1,
+        "sha512": hashlib.sha512,
+        "md5": hashlib.md5,
+        "blake2b": hashlib.blake2b,
+        "blake2s": hashlib.blake2s,
+    }
+    
+    if algorithm not in algorithms:
+        raise ValueError(f"Unknown algorithm: {algorithm}. Available: {list(algorithms.keys())}")
+    
+    hasher = algorithms[algorithm]()
+    
+    with open(filepath, "rb") as f:
+        while True:
+            data = f.read(buffer_size)
+            if not data:
+                break
+            hasher.update(data)
+    
+    return hasher.hexdigest()
+
+
+def compute_crc32(filepath: str, buffer_size: int = 65536) -> str:
+    """Compute CRC32 checksum."""
+    crc = 0
+    with open(filepath, "rb") as f:
+        while True:
+            data = f.read(buffer_size)
+            if not data:
+                break
+            crc = binascii.crc32(data, crc)
+    return format(crc & 0xFFFFFFFF, '08x')
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Compute file hashes")
+    parser.add_argument("file", help="File to hash")
+    parser.add_argument("-a", "--algorithm", default="sha256",
+                        choices=["sha256", "sha1", "sha512", "md5", "blake2b", "blake2s", "crc32"],
+                        help="Hash algorithm (default: sha256)")
+    parser.add_argument("-j", "--json", action="store_true",
+                        help="Output as JSON")
+    
+    args = parser.parse_args()
+    
+    filepath = Path(args.file)
+    if not filepath.exists():
+        print(f"Error: File not found: {filepath}", file=sys.stderr)
+        sys.exit(1)
+    
+    if args.algorithm == "crc32":
+        result = compute_crc32(str(filepath))
+    else:
+        result = compute_hash(str(filepath), args.algorithm)
+    
+    if args.json:
+        import json
+        print(json.dumps({
+            "file": str(filepath),
+            "algorithm": args.algorithm,
+            "hash": result,
+            "length": len(result)
+        }))
+    else:
+        print(f"{args.algorithm}:{result}")
+
+
+if __name__ == "__main__":
+    main()