mirror of https://github.com/status-im/go-waku.git
48 lines
1.0 KiB
Go
48 lines
1.0 KiB
Go
package protocol
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import (
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"crypto/rand"
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"sync"
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"github.com/cruxic/go-hmac-drbg/hmacdrbg"
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logging "github.com/ipfs/go-log"
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)
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var log = logging.Logger("request-gen")
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var brHmacDrbgPool = sync.Pool{New: func() interface{} {
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seed := make([]byte, 48)
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_, err := rand.Read(seed)
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if err != nil {
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log.Fatal(err)
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}
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return hmacdrbg.NewHmacDrbg(256, seed, nil)
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}}
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// GenerateRequestId generates a random 32 byte slice that can be used for
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// creating requests inf the filter, store and lightpush protocols
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func GenerateRequestId() []byte {
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rng := brHmacDrbgPool.Get().(*hmacdrbg.HmacDrbg)
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defer brHmacDrbgPool.Put(rng)
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randData := make([]byte, 32)
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if !rng.Generate(randData) {
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//Reseed is required every 10,000 calls
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seed := make([]byte, 48)
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_, err := rand.Read(seed)
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if err != nil {
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log.Fatal(err)
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}
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err = rng.Reseed(seed)
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if err != nil {
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//only happens if seed < security-level
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log.Fatal(err)
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}
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if !rng.Generate(randData) {
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log.Error("could not generate random request id")
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}
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}
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return randData
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}
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