forked from Qortal/qortal-ui
28 lines
1.3 KiB
JavaScript
28 lines
1.3 KiB
JavaScript
import nacl from '../../deps/nacl-fast.js'
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import Base58 from '../../deps/Base58.js'
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import ed2curve from '../../deps/ed2curve.js'
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import { Sha256 } from 'asmcrypto.js'
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export const decryptChatMessage = (encryptedMessage, privateKey, recipientPublicKey, lastReference) => {
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let _encryptedMessage = Base58.decode(encryptedMessage)
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const _base58RecipientPublicKey = recipientPublicKey instanceof Uint8Array ? Base58.encode(recipientPublicKey) : recipientPublicKey
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const _recipientPublicKey = Base58.decode(_base58RecipientPublicKey)
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const _lastReference = lastReference instanceof Uint8Array ? lastReference : Base58.decode(lastReference)
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const convertedPrivateKey = ed2curve.convertSecretKey(privateKey)
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const convertedPublicKey = ed2curve.convertPublicKey(_recipientPublicKey)
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const sharedSecret = new Uint8Array(32);
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nacl.lowlevel.crypto_scalarmult(sharedSecret, convertedPrivateKey, convertedPublicKey);
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const _chatEncryptionSeed = new Sha256().process(sharedSecret).finish().result
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const _decryptedMessage = nacl.secretbox.open(_encryptedMessage, _lastReference.slice(0, 24), _chatEncryptionSeed)
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let decryptedMessage = ''
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_decryptedMessage === false ? decryptedMessage : decryptedMessage = new TextDecoder('utf-8').decode(_decryptedMessage);
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return decryptedMessage
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}
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