Implementation of https://jrdngr.github.io/pngme_book/
cargo build
cargo build --release
Hide secret message in png files
Usage: pngme <COMMAND>
Commands:
encode
decode
remove
print
help Print this message or the help of the given subcommand(s)
Options:
-h, --help Print help$ cargo run encode dice.png ruSt "this is secret"
$ cargo run decode dice.png ruSt
this is secret
$ cargo run remove dice.png ruSt
$ cargo run decode dice.png ruSt
No secret message found
$ cargo run print dict.png
Chunk {
Length: 13
Type: IHDR
Data: 13 bytes
Crc: 804134823
}
Chunk {
Length: 4
Type: gAMA
Data: 4 bytes
Crc: 201089285
}
Chunk {
Length: 32
Type: cHRM
Data: 32 bytes
Crc: 2629456188
}
Chunk {
Length: 6
Type: bKGD
Data: 6 bytes
Crc: 4181965695
}
Chunk {
Length: 7
Type: tIME
Data: 7 bytes
Crc: 3906383041
}
Chunk {
Length: 32768
Type: IDAT
Data: 32768 bytes
Crc: 1053753753
}
Chunk {
Length: 32768
Type: IDAT
Data: 32768 bytes
Crc: 2711955290
}
Chunk {
Length: 32768
Type: IDAT
Data: 32768 bytes
Crc: 1661320401
}
Chunk {
Length: 32768
Type: IDAT
Data: 32768 bytes
Crc: 864217832
}
Chunk {
Length: 12435
Type: IDAT
Data: 12435 bytes
Crc: 1720023695
}
Chunk {
Length: 37
Type: tEXt
Data: 37 bytes
Crc: 2834148272
}
Chunk {
Length: 37
Type: tEXt
Data: 37 bytes
Crc: 3652195084
}
Chunk {
Length: 0
Type: IEND
Data: 0 bytes
Crc: 2923585666
}➜ cargo run encode dice.png rust "this is secret"
Error: Supplied chunk type value: rust is not valid