rabaead

rabbit128 poly1305 aead cipher package for golang, this package implement aead (authenticated encryption with associated data) cipher with associated io chunk and io stream interfaces.

aead methods:

• seal: seals a plaintext into the rabbit aead ciphertext. panic occurs if nonce len is not equal to IVXLen (8byte) or zero
• open: opens a rabbit aead ciphertext. panic occurs if nonce len is not equal to IVXLen (8byte) or zero

io interfaces:

• chunkReader: read and open() data in chunks, there is 2byte + 16byte overhead per chunk. read data can be used safely. this reader has a chunk size in-memory buffer, large chunk size can make application to runs out of memory, thus this is most suitable for sliced data, like network data transmit and so..

• chunkReader: seal() and write data in chunks, there is 2byte + 16byte overhead per chunk. this writer has a chunk size in-memory buffer, large chunk size can make application to runs out of memory, thus this is most suitable for sliced data, like network data transmit and so..

• streamReader: this reader open() and read aead ciphertext which have 16-byte poly1305 tag overhead. read data is unreliable until underlying reader returns EOF, after that Read return EOF or ErrAuthMsg if integrity of data has been compromised. in such a case, you need to unread data. a simple demonstration would be to delete or truncate the file if ErrAuthMsg is returned

• streamWriter: this writer seal() and write aead plaintext which have 16-byte poly1305 tag overhead, running Close() is necessary in order to calculate and write tag at the end of the write.

how to use?

rabaead lives on both github and snix git services, you can simply import this package by using either import "snix.ir/rabaead" or import "github.com/sina-ghaderi/rabaead"

examples

check out _example directory which contains real-world use cases of rabaead cipher, in addition you may want to look at test unit files or package documentation at pkg.go.dev

// aead open() and seal() methods
func rabbitPoly1305() {
    key := []byte{
        0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01,
    }
    ivx := []byte{
        0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01,
    }
    buff := []byte("plain-text")
    aead, err := rabaead.NewAEAD(key)
    if err != nil {
        panic(err)
    }
    ctxt := aead.Seal([]byte{}, ivx, buff, nil)
    fmt.Printf("aead data: %x\n", ctxt)
    ptxt, err := aead.Open([]byte{}, ivx, ctxt, nil)
    if err != nil {
        panic(err)
    }
    fmt.Printf("plaintext: %s\n", string(ptxt))
}

licence and contribute

feel free to email me sina@snix.ir if you want to contribute to this project. GNU General Public License v3