Pure Go GOST cryptographic functions library.

Fork of original gogost project https://git.cypherpunks.ru/cgit.cgi/gogost.git

GOST is GOvernment STandard of Russian Federation (and Soviet Union).

• GOST 28147-89 (RFC 5830) block cipher with ECB, CNT (CTR), CFB, MAC CBC (RFC 4357) modes of operation
• various 28147-89-related S-boxes included
• GOST R 34.11-94 hash function (RFC 5831)
• GOST R 34.11-2012 Стрибог (Streebog) hash function (RFC 6986)
• GOST R 34.10-2001 (RFC 5832) public key signature function
• GOST R 34.10-2012 (RFC 7091) public key signature function
• various 34.10 curve parameters included
• Coordinates conversion from twisted Edwards to Weierstrass form and vice versa
• VKO GOST R 34.10-2001 key agreement function (RFC 4357)
• VKO GOST R 34.10-2012 key agreement function (RFC 7836)
• KDF_GOSTR3411_2012_256 KDF function (RFC 7836)
• GOST R 34.12-2015 128-bit block cipher Кузнечик (Kuznechik) (RFC 7801)
• GOST R 34.12-2015 64-bit block cipher Магма (Magma)
• GOST R 34.13-2015 padding methods
• MGM AEAD mode for 64 and 128 bit ciphers (Р 1323565.1.026–2019)
• TLSTREE keyscheduling function
• ESPTREE/IKETREE (IKE* is the same as ESP*) keyscheduling function
• PRF_IPSEC_PRFPLUS_GOSTR3411_2012_{256,512} and generic prf+ functions (Р 50.1.111-2016 with IKEv2 RFC 7296)

Probably you could be interested in Go's support of GOST TLS 1.3 (http://www.gostls13.cypherpunks.ru/).

Known problems:

• intermediate calculation values are not zeroed
• 34.10 is not time constant and slow

Example 34.10-2012-256 keypair generation, signing and verifying:

import (
    "crypto/rand"
    "io"
    "github.com/ftomza/gogost/gost3410"
    "github.com/ftomza/gogost/gost34112012256"
)
func main() {
    data := []byte("data to be signed")
    hasher := gost34112012256.New()
    _, err := hasher.Write(data)
    dgst := hasher.Sum(nil)
    curve := gost3410.CurveIdtc26gost34102012256paramSetB()
    prvRaw := make([]byte, int(32))
    _, err = io.ReadFull(rand.Reader, prvRaw)
    prv, err := gost3410.NewPrivateKey(curve, prvRaw)
    pub, err := prv.PublicKey()
    pubRaw := pub.Raw()
    sign, err := prv.Sign(rand.Reader, dgst, nil)
    pub, err = gost3410.NewPublicKey(curve, pubRaw)
    isValid, err := pub.VerifyDigest(dgst, sign)
    if !isValid { panic("signature is invalid") }
}

GoGOST is free software: see the file COPYING for copying conditions.

GoGOST'es home page is: http://www.gogost.cypherpunks.ru/ You can read about GOST algorithms more: http://www.gost.cypherpunks.ru/

Please send questions, bug reports and patches to https://lists.cypherpunks.ru/mailman/listinfo/gost mailing list. Announcements also go to this mailing list.

Development Git source code repository currently is located here: http://git.cypherpunks.ru/cgit.cgi/gogost.git/