SubtleCrypto.unwrapKey()

安全上下文: 此特性仅在一些支持的浏览器的安全上下文(HTTPS)中可用。

unwrapKey(format, wrappedKey, unwrappingKey, unwrapAlgo, unwrappedKeyAlgo, extractable, keyUsages)

备注: 你可以在 Github 上尝试可用的示例。

/*
用于派生包装密钥的盐,
与用户提供的密码一起使用。
其必须与原先在派生密钥时使用的盐相同。
*/
const saltBytes = [
 89, 113, 135, 234, 168, 204, 21, 36, 55, 93, 1, 132, 242, 242, 192, 156,
];
/*
包装的密钥。
*/
const wrappedKeyBytes = [
 171, 223, 14, 36, 201, 233, 233, 120, 164, 68, 217, 192, 226, 80, 224, 39,
 199, 235, 239, 60, 212, 169, 100, 23, 61, 54, 244, 197, 160, 80, 109, 230,
 207, 225, 57, 197, 175, 71, 80, 209,
];
/*
将字节序列转换为 ArrayBuffer。
*/
function bytesToArrayBuffer(bytes) {
 const bytesAsArrayBuffer = new ArrayBuffer(bytes.length);
 const bytesUint8 = new Uint8Array(bytesAsArrayBuffer);
 bytesUint8.set(bytes);
 return bytesAsArrayBuffer;
}
/*
从用户输入获取一些密钥材料,用于派生密钥(deriveKey)方法。
密钥材料是一个由用户提供的密码。
*/
function getKeyMaterial() {
 let password = window.prompt("Enter your password");
 let enc = new TextEncoder();
 return window.crypto.subtle.importKey(
 "raw",
 enc.encode(password),
 { name: "PBKDF2" },
 false,
 ["deriveBits", "deriveKey"],
 );
}
/*
使用 PBKDF2 派生 AES-KW 密钥
*/
async function getUnwrappingKey() {
 // 1. 获得密钥材料(用户提供的密码)
 const keyMaterial = await getKeyMaterial();
 // 2. 初始化盐的参数
 // 盐必须与派生密钥时使用的相匹配。
 // 在这个示例中,它由常量"saltBytes"提供。
 const saltBuffer = bytesToArrayBuffer(saltBytes);
 // 3. 由密钥材料和盐派生密钥
 return window.crypto.subtle.deriveKey(
 {
 name: "PBKDF2",
 salt: saltBuffer,
 iterations: 100000,
 hash: "SHA-256",
 },
 keyMaterial,
 { name: "AES-KW", length: 256 },
 true,
 ["wrapKey", "unwrapKey"],
 );
}
/*
从包含原始字节序列的 ArrayBuffer 解包装 AES 密钥。
以包含字节序列的数组为参数,返回一个 Promise,
会兑现为表示密钥的 CryptoKey。
*/
async function unwrapSecretKey(wrappedKey) {
 // 1. 获取解包密钥
 const unwrappingKey = await getUnwrappingKey();
 // 2. 初始化已包装的密钥
 const wrappedKeyBuffer = bytesToArrayBuffer(wrappedKey);
 // 3. 解开密钥的包装
 return window.crypto.subtle.unwrapKey(
 "raw", // 导入的格式
 wrappedKeyBuffer, // 表示要解包的密钥的 ArrayBuffer
 unwrappingKey, // 表示加密密钥时使用的 CryptoKey
 "AES-KW", // 加密密钥时使用的算法
 "AES-GCM", // 解包密钥使用的算法
 true, // 解包后的密钥的可导出性
 ["encrypt", "decrypt"], // 解包后的密钥的用途
 );
}

/*
用于派生包装密钥的盐,
与用户提供的密码一起使用。
其必须与原先在派生密钥时使用的盐相同。
*/
const saltBytes = [
 180, 253, 62, 216, 47, 35, 90, 55, 218, 233, 103, 10, 172, 143, 161, 177,
];
/*
在解包装时用于解密的 IV 必须与原先在加密密钥时使用的 IV 相同。
*/
const ivBytes = [212, 187, 26, 247, 172, 51, 37, 151, 27, 177, 249, 142];
/*
已包装的密钥。
*/
const wrappedKeyBytes = [
 6, 155, 182, 208, 7, 141, 44, 18, 3, 151, 58, 126, 68, 100, 252, 225, 241, 11,
 25, 201, 153, 171, 102, 174, 150, 29, 62, 195, 110, 138, 106, 109, 14, 6, 108,
 148, 104, 221, 22, 93, 102, 221, 146, 25, 65, 112, 4, 140, 79, 194, 164, 163,
 156, 250, 108, 11, 14, 220, 78, 194, 161, 17, 14, 57, 121, 70, 13, 28, 220,
 210, 78, 32, 46, 217, 36, 165, 220, 170, 244, 152, 214, 150, 83, 2, 138, 128,
 11, 251, 227, 213, 72, 100, 158, 10, 162, 40, 195, 60, 248, 77, 37, 156, 34,
 10, 213, 171, 67, 147, 73, 231, 31, 63, 80, 176, 103, 206, 187, 164, 214, 250,
 49, 223, 185, 5, 48, 241, 17, 1, 253, 59, 185, 181, 209, 255, 42, 223, 175,
 90, 159, 174, 169, 205, 156, 120, 195, 1, 135, 165, 226, 46, 119, 27, 97, 183,
 23, 197, 227, 85, 138, 235, 79, 158, 167, 59, 62, 194, 34, 210, 214, 240, 215,
 101, 233, 63, 138, 53, 87, 253, 189, 27, 66, 150, 76, 242, 76, 102, 174, 179,
 163, 184, 205, 11, 161, 224, 19, 110, 34, 175, 192, 101, 117, 169, 86, 66, 56,
 241, 128, 13, 156, 165, 125, 139, 110, 138, 50, 108, 129, 251, 137, 26, 186,
 110, 117, 113, 207, 179, 59, 213, 18, 175, 14, 203, 192, 2, 97, 131, 125, 167,
 227, 182, 87, 72, 123, 54, 156, 60, 195, 88, 224, 96, 46, 126, 245, 251, 247,
 147, 110, 147, 173, 82, 106, 93, 210, 55, 71, 127, 133, 41, 37, 181, 17, 106,
 16, 158, 220, 136, 43, 75, 133, 96, 240, 151, 116, 40, 44, 254, 2, 32, 74,
 226, 193, 172, 48, 211, 71, 109, 163, 143, 30, 92, 28, 30, 183, 25, 16, 176,
 207, 77, 93, 139, 242, 114, 91, 218, 126, 123, 234, 18, 9, 245, 53, 46, 172,
 215, 62, 92, 249, 191, 17, 27, 0, 58, 151, 33, 23, 169, 93, 177, 253, 152,
 147, 198, 196, 226, 42, 202, 166, 99, 250, 127, 40, 221, 196, 121, 195, 198,
 235, 30, 159, 159, 95, 182, 107, 175, 137, 177, 49, 72, 63, 131, 162, 198,
 186, 22, 255, 230, 237, 195, 56, 147, 177, 101, 52, 227, 125, 32, 180, 242,
 47, 92, 212, 6, 148, 218, 107, 125, 137, 123, 15, 51, 107, 159, 228, 238, 212,
 60, 54, 184, 48, 110, 248, 252, 208, 46, 23, 149, 78, 169, 201, 68, 242, 193,
 251, 156, 227, 42, 90, 109, 102, 172, 61, 207, 124, 96, 98, 79, 37, 218, 16,
 212, 139, 162, 0, 183, 235, 171, 75, 18, 84, 160, 120, 173, 156, 187, 99, 24,
 58, 88, 213, 148, 24, 193, 111, 75, 169, 10, 158, 207, 148, 84, 249, 156, 248,
 19, 221, 2, 175, 1, 8, 74, 221, 212, 244, 123, 34, 223, 175, 54, 166, 101, 51,
 175, 141, 80, 87, 9, 146, 72, 223, 46, 251, 199, 192, 2, 22, 125, 16, 15, 99,
 26, 159, 165, 133, 172, 169, 26, 236, 44, 86, 182, 162, 81, 143, 249, 15, 207,
 12, 232, 15, 205, 199, 78, 133, 199, 19, 232, 183, 33, 183, 72, 117, 72, 27,
 43, 254, 13, 17, 252, 1, 143, 137, 154, 10, 4, 77, 85, 24, 85, 143, 200, 81,
 76, 171, 43, 124, 42, 191, 150, 70, 10, 90, 178, 198, 40, 233, 233, 225, 146,
 231, 209, 254, 2, 90, 216, 5, 97, 105, 204, 82, 88, 81, 99, 92, 159, 116, 192,
 223, 148, 252, 12, 24, 197, 211, 187, 212, 98, 252, 201, 154, 184, 65, 54, 47,
 13, 106, 151, 168, 208, 112, 212, 74, 204, 36, 233, 98, 104, 58, 103, 1, 194,
 13, 26, 109, 101, 60, 42, 3, 215, 20, 25, 99, 176, 63, 28, 112, 102, 121, 190,
 96, 198, 228, 196, 78, 38, 82, 37, 248, 42, 150, 115, 6, 10, 22, 101, 42, 237,
 175, 69, 232, 212, 231, 40, 193, 70, 211, 245, 106, 231, 175, 150, 88, 105,
 170, 139, 238, 196, 64, 218, 250, 47, 165, 22, 36, 196, 161, 30, 79, 175, 14,
 133, 88, 129, 182, 56, 140, 147, 168, 134, 91, 68, 172, 110, 195, 134, 156,
 68, 78, 249, 215, 68, 250, 11, 23, 70, 59, 156, 99, 75, 249, 159, 84, 16, 206,
 93, 16, 130, 34, 66, 210, 82, 252, 53, 251, 84, 59, 226, 212, 154, 15, 20,
 163, 58, 228, 109, 53, 214, 151, 237, 10, 169, 107, 180, 123, 174, 159, 182,
 8, 240, 115, 115, 220, 131, 128, 79, 80, 61, 133, 58, 24, 98, 193, 225, 56,
 36, 159, 254, 199, 49, 44, 160, 28, 81, 140, 163, 24, 143, 114, 31, 237, 235,
 250, 83, 72, 215, 44, 232, 182, 45, 39, 182, 193, 248, 65, 174, 186, 52, 219,
 30, 198, 48, 1, 134, 151, 81, 114, 38, 124, 7, 213, 205, 138, 28, 22, 216, 76,
 46, 224, 241, 88, 156, 7, 62, 23, 104, 34, 54, 25, 156, 93, 212, 133, 182, 61,
 93, 255, 195, 68, 244, 234, 53, 132, 151, 140, 72, 146, 127, 113, 227, 34,
 243, 218, 222, 47, 218, 113, 18, 173, 203, 158, 133, 90, 156, 214, 77, 20,
 113, 1, 231, 164, 52, 55, 69, 132, 24, 68, 131, 212, 7, 153, 34, 179, 113,
 156, 81, 127, 83, 57, 29, 195, 90, 64, 211, 115, 202, 188, 5, 42, 188, 142,
 203, 109, 231, 53, 206, 72, 220, 90, 23, 12, 1, 178, 122, 60, 221, 68, 6, 14,
 154, 108, 203, 171, 142, 159, 249, 13, 55, 52, 110, 214, 33, 147, 164, 181,
 50, 79, 164, 200, 83, 251, 40, 105, 223, 50, 0, 115, 240, 146, 23, 122, 80,
 204, 169, 38, 198, 154, 31, 29, 23, 236, 39, 35, 131, 147, 242, 163, 138, 158,
 236, 117, 7, 108, 33, 132, 98, 50, 111, 46, 146, 251, 82, 34, 85, 5, 130, 237,
 67, 40, 170, 235, 124, 92, 66, 71, 239, 12, 97, 136, 251, 1, 206, 13, 51, 232,
 92, 46, 35, 95, 5, 123, 24, 183, 99, 243, 124, 75, 155, 89, 66, 54, 72, 17,
 255, 99, 137, 199, 232, 204, 9, 248, 78, 35, 218, 136, 117, 239, 102, 240,
 187, 40, 89, 244, 140, 109, 229, 120, 116, 54, 207, 171, 11, 248, 190, 199,
 81, 53, 109, 8, 188, 51, 93, 165, 34, 255, 165, 191, 198, 130, 220, 41, 192,
 166, 194, 69, 104, 124, 158, 122, 236, 176, 24, 60, 87, 240, 42, 158, 143, 37,
 143, 208, 155, 249, 230, 21, 4, 230, 56, 194, 62, 235, 132, 14, 50, 180, 216,
 134, 28, 25, 159, 64, 199, 161, 236, 60, 233, 160, 172, 68, 169, 2, 5, 252,
 190, 20, 54, 115, 248, 63, 93, 107, 156, 8, 96, 85, 32, 189, 118, 66, 114,
 126, 64, 203, 97, 235, 13, 18, 102, 192, 51, 59, 5, 122, 171, 96, 129, 40, 32,
 154, 4, 191, 234, 75, 184, 112, 201, 244, 110, 50, 216, 44, 88, 139, 175, 58,
 112, 7, 52, 25, 64, 112, 40, 148, 187, 39, 234, 96, 151, 16, 158, 114, 113,
 109, 164, 47, 108, 94, 148, 35, 232, 221, 33, 110, 126, 170, 25, 234, 45, 165,
 180, 210, 193, 120, 247, 155, 127,
];
/*
解包装的签名密钥。
*/
let signingKey;
const signButton = document.querySelector(".pkcs8 .sign-button");
/*
将字节数组转换为 ArrayBuffer。
*/
function bytesToArrayBuffer(bytes) {
 const bytesAsArrayBuffer = new ArrayBuffer(bytes.length);
 const bytesUint8 = new Uint8Array(bytesAsArrayBuffer);
 bytesUint8.set(bytes);
 return bytesAsArrayBuffer;
}
/*
从用户输入获取一些密钥材料,用于派生密钥(deriveKey)方法。
密钥材料是一个由用户提供的密码。
*/
function getKeyMaterial() {
 let password = window.prompt("Enter your password");
 let enc = new TextEncoder();
 return window.crypto.subtle.importKey(
 "raw",
 enc.encode(password),
 { name: "PBKDF2" },
 false,
 ["deriveBits", "deriveKey"],
 );
}
/*
使用 PBKDF2 派生 AES-GCM 密钥。
*/
async function getUnwrappingKey() {
 // 1. 获得密钥材料(用户提供的密码)
 const keyMaterial = await getKeyMaterial();
 // 2. 初始化盐的参数
 // 盐必须与派生密钥时使用的相匹配。
 // 在这个示例中,它由常量"saltBytes"提供。
 const saltBuffer = bytesToArrayBuffer(saltBytes);
 // 3. 由密钥材料和盐派生密钥
 return window.crypto.subtle.deriveKey(
 {
 name: "PBKDF2",
 salt: saltBuffer,
 iterations: 100000,
 hash: "SHA-256",
 },
 keyMaterial,
 { name: "AES-GCM", length: 256 },
 true,
 ["wrapKey", "unwrapKey"],
 );
}
/*
从包含原始字节序列的 ArrayBuffer 解包装 RSA-PSS 私有签名密钥。
以包含字节序列的数组为参数,返回一个 Promise,
会兑现为表示私有密钥的 CryptoKey。
*/
async function unwrapPrivateKey(wrappedKey) {
 // 1. 获取解包密钥
 const unwrappingKey = await getUnwrappingKey();
 // 2. 初始化已包装的密钥
 const wrappedKeyBuffer = bytesToArrayBuffer(wrappedKey);
 // 3. 初始化 iv
 const ivBuffer = bytesToArrayBuffer(ivBytes);
 // 4. 解开密钥的包装
 return window.crypto.subtle.unwrapKey(
 "pkcs8", // 导入的格式
 wrappedKeyBuffer, // 表示要解包的密钥的 ArrayBuffer
 unwrappingKey, // 表示加密密钥时使用的 CryptoKey
 {
 // 用于加密密钥的算法参数
 name: "AES-GCM",
 iv: ivBuffer,
 },
 {
 // 用于解开密钥包装的算法参数
 name: "RSA-PSS",
 hash: "SHA-256",
 },
 true, // 解包后的密钥的可导出性
 ["sign"], // 解包后的密钥的用途
 );
}

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This page was last modified on ⁨2024年7月28日⁩ by MDN contributors.