Module aes/aes_ctr

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Expand description

Code related to AES_CTR mode

Functions

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(algorithm: Omit<EnforcedAesCtrParams, "name">, key: AesCtrCryptoKey, data: BufferSource): Promise<ArrayBuffer>

Decrypt with an AES_CTR key

example
const data = await AES_CTR.decrypt({length, counter}, key.self, data);
example
const data = await key.decrypt({length, counter}, data);
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(algorithm: Omit<EnforcedAesCtrParams, "name">, key: AesCtrCryptoKey, data: BufferSource): Promise<ArrayBuffer>

Encrypt with an AES_CTR key

example
const key = await AES_CTR.generateKey();
const message = new TextEncoder().encode("a message");
const length = 8;
const counter = await AES_CTR.generateCounter(length);
const data = await AES_CTR.encrypt({length, counter}, key.self, message);
example
const key = await AES_CTR.generateKey();
const message = new TextEncoder().encode("a message");
const length = 8;
const counter = await AES_CTR.generateCounter(length);
const data = await key.encrypt({length, counter}, message);
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(format: KeyFormat, key: AesCtrCryptoKey): Promise<ArrayBuffer | JsonWebKey>

Export an AES_CTR key into the specified format

example
const key = await AES_CTR.generateKey();
const jwk = await AES_CTR.exportKey("jwk", key.self);
example
const key = await AES_CTR.generateKey();
const jwk = await key.exportKey("jwk");
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(counterLength?: number): Promise<Uint8Array>

Generates a counter, with the given length, starting from the count of 1. The nonce is randomized.

see

https://developer.mozilla.org/en-US/docs/Web/API/AesCtrParams

example
const counter = await AES_CTR.generateCounter();
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(algorithm?: Omit<EnforcedAesKeyGenParams, "name">, extractable?: boolean, keyUsages?: KeyUsage[]): Promise<AesCtrProxiedCryptoKey>

Generate a new AES_CTR key

example
const key = await AES_CTR.generateKey();
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(format: KeyFormat, key: BufferSource | JsonWebKey, algorithm: Omit<AesCtrKeyAlgorithm, "name">, extractable?: boolean, keyUsages?: KeyUsage[]): Promise<AesCtrProxiedCryptoKey>

Import an AES_CTR key from the specified format

example
const key = await AES_CTR.importKey("jwk", jwk, { length: 256 });
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(format: KeyFormat, wrappedKey: BufferSource, wrappedKeyAlgorithm: EnforcedImportParams, unwrappingKey: AesCtrCryptoKey, unwrappingKeyAlgorithm: Omit<EnforcedAesCtrParams, "name">, extractable?: boolean, keyUsages?: KeyUsage[]): Promise<CryptoKey>

Unwrap a wrapped key using the key encryption key

example
const dek = await AES_CTR.unwrapKey("raw", wrappedKey, {name: "AES_CTR"}, kek.self, {length, counter});
example
const dek = await kek.unwrapKey("raw", wrappedKey, {name: "AES_CTR"}, {length, counter});
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(format: KeyFormat, key: CryptoKey, wrappingkey: AesCtrCryptoKey, wrapAlgorithm: Omit<EnforcedAesCtrParams, "name">): Promise<ArrayBuffer>

Wrap another key with an AES_CTR key

example
const kek = await AES_CTR.generateKey({length: 256}, true, ['wrapKey', 'unwrapKey']);
const dek = await AES_CTR.generateKey();
const length = 8;
const counter = await AES_CTR.generateCounter(length);
const wrappedKey = await AES_CTR.wrapKey("raw", dek.self, kek.self, {length, counter});
example
const kek = await AES_CTR.generateKey({length: 256}, true, ['wrapKey', 'unwrapKey']);
const dek = await AES_CTR.generateKey();
const length = 8;
const counter = await AES_CTR.generateCounter(length);
const wrappedKey = await kek.wrapKey("raw", dek.self, {length, counter});