s3sum

Like sha256sum, but for S3. Computes CRC64NVME checksums so you can verify object integrity before or after upload.

Install

go install github.com/gabesullice/s3sum@latest

Or build from source:

make
sudo make install

Examples

Reads from stdin by default:

echo -n "hello" | s3sum
M3eFcAZSQlc=  -

Checksum one or more files with -f:

s3sum -f file1.txt -f file2.txt
M3eFcAZSQlc=  file1.txt
aBcDeFgHiJk=  file2.txt

Checksum a whole directory with -d, add -r to recurse:

s3sum -d ./data -r
M3eFcAZSQlc=  data/file1.txt
aBcDeFgHiJk=  data/sub/file2.txt

Save checksums and verify them later with -c:

s3sum -d ./data > checksums.txt
s3sum -c checksums.txt
data/file1.txt: OK
data/file2.txt: OK

Or pipe directly:

s3sum -d ./data | s3sum -c -

Output defaults to base64 (matching S3). Use -e hex for hex.