diff options
| -rw-r--r-- | main.go | 40 |
1 files changed, 40 insertions, 0 deletions
@@ -9,6 +9,7 @@ import ( "encoding/binary" "errors" "flag" + "html" "html/template" "io" "log" @@ -76,6 +77,12 @@ Encode your selected value in base64 and submit it below: <input name="powxy" type="text" /> <input type="submit" value="Submit" /> </form> +<br /> +<details> +<summary> +Python script to automatically solve this +</summary><pre>` + html.EscapeString(pythonScript) + `</pre> +</details> </body> </html> `) @@ -236,3 +243,36 @@ func validateBitZeros(bs []byte, n uint) bool { return true } + +const pythonScript = ` +import base64 +import hashlib +import random +import sys + +def proc(encoded, n_bits): + decoded = base64.b64decode(encoded) + while True: + appended = bytes([random.randint(0, 255) for _ in range(16)]) + sha256_hash = hashlib.sha256(decoded + appended).digest() + hash_bits = ''.join(f'{byte:08b}' for byte in sha256_hash) + if hash_bits[:n_bits] == '0' * n_bits: + return appended + +def main() : + if len(sys.argv) != 3: + print(f"usage: {sys.argv[0]} <encoded> <n_bits>", file=sys.stderr) + sys.exit(1) + + encoded = sys.argv[1] + n_bits = int(sys.argv[2]) + + if n_bits < 0 or n_bits > 256: + print("error: n_bits should be between 0 and 256", file=sys.stderr) + sys.exit(1) + + print(base64.b64encode(proc(encoded, n_bits)).decode("ascii")) + +if __name__ == "__main__": + main() +` |