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22 lines
471 B
Go
22 lines
471 B
Go
package crypto
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import (
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"crypto/cipher"
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"github.com/aead/chacha20"
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)
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// NewChaCha20Stream creates a new Chacha/20 cipher stream. Caller must ensure that key is 32-bytes long and iv is either 8 or 12 bytes.
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func NewChaCha20Stream(key []byte, iv []byte) cipher.Stream {
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var keyArray [32]byte
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var nonce [12]byte
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copy(keyArray[:], key)
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switch len(iv) {
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case 8:
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copy(nonce[4:], iv)
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case 12:
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copy(nonce[:], iv)
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}
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return chacha20.NewCipher(&nonce, &keyArray)
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}
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