Parse COSE(CBOR Object Signing and Encryption) to JWK(JSON Web Key) or PEM.
npm install parse-cosekey
npm install parse-cosekey
`
Usage
$3
`js
import cosekey from 'parse-cosekey';
// const cosekey = require('parse-cosekey'); // if you use CommonJS
const jwk = cosekey.KeyParser.cose2jwk(coseMap);
`
$3
This module's most used class is KeyParser that parses key.
#### COSE <-> JWK
`js
import cosekey from 'parse-cosekey';
const coseMap = new Map()
.set(1, 2)
.set(3, -7)
.set(-1, 1)
.set(
-2,
Buffer.from([
0xe7, 0x64, 0xeb, 0xad, 0x3b, 0xf0, 0x03, 0x87, 0x46, 0x99, 0xb7, 0xc5, 0x41, 0xce, 0x94, 0x79, 0x6a, 0x17, 0xac, 0xd6, 0x53, 0xeb, 0x58, 0x28, 0xba, 0x2f, 0x40, 0xa3, 0xe3, 0x4b, 0xf7, 0xdb,
]),
)
.set(
-3,
Buffer.from([
0x93, 0xc3, 0xdf, 0xd7, 0x10, 0xee, 0x2c, 0xb4, 0x43, 0x4e, 0x27, 0xd5, 0x42, 0x50, 0x2e, 0x82, 0xef, 0x5f, 0x2c, 0xa0, 0xef, 0xe8, 0xde, 0xd8, 0x1d, 0xce, 0x9d, 0xad, 0xbc, 0x1a, 0x40, 0x2c,
]),
);
const jwk = cosekey.KeyParser.cose2jwk(coseMap);
// {
// kty: 'EC',
// alg: 'ES256',
// crv: 'P-256',
// x: '52TrrTvwA4dGmbfFQc6UeWoXrNZT61goui9Ao-NL99s',
// y: 'k8Pf1xDuLLRDTifVQlAugu9fLKDv6N7YHc6drbwaQCw'
// }
`
You can also parse JWK to COSE using KeyParser#jwk2cose.
#### JWK -> PEM
`js
import cosekey from 'parse-cosekey';
const jwk = {
kty: 'EC',
alg: 'ES256',
crv: 'P-256',
x: Buffer.from([
0xe7, 0x64, 0xeb, 0xad, 0x3b, 0xf0, 0x03, 0x87, 0x46, 0x99, 0xb7, 0xc5, 0x41, 0xce, 0x94, 0x79, 0x6a, 0x17, 0xac,
0xd6, 0x53, 0xeb, 0x58, 0x28, 0xba, 0x2f, 0x40, 0xa3, 0xe3, 0x4b, 0xf7, 0xdb,
]),
y: Buffer.from([
0x93, 0xc3, 0xdf, 0xd7, 0x10, 0xee, 0x2c, 0xb4, 0x43, 0x4e, 0x27, 0xd5, 0x42, 0x50, 0x2e, 0x82, 0xef, 0x5f, 0x2c,
0xa0, 0xef, 0xe8, 0xde, 0xd8, 0x1d, 0xce, 0x9d, 0xad, 0xbc, 0x1a, 0x40, 0x2c,
]),
};
const pem = await cosekey.KeyParser.jwk2pem(jwk);
// -----BEGIN PUBLIC KEY-----
// MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE52TrrTvwA4dGmbfFQc6UeWoXrNZT
// 61goui9Ao+NL99uTw9/XEO4stENOJ9VCUC6C718soO/o3tgdzp2tvBpALA==
// -----END PUBLIC KEY-----
`
You can also parse PEM to JWK using KeyParser#pem2jwk.
#### COSE -> PEM
Directly parse COSE to PEM.
`js
import cosekey from 'parse-cosekey';
const coseMap = new Map()
.set(1, 2)
.set(3, -7)
.set(-1, 1)
.set(
-2,
Buffer.from([
0xe7, 0x64, 0xeb, 0xad, 0x3b, 0xf0, 0x03, 0x87, 0x46, 0x99, 0xb7, 0xc5, 0x41, 0xce, 0x94, 0x79, 0x6a, 0x17,
0xac, 0xd6, 0x53, 0xeb, 0x58, 0x28, 0xba, 0x2f, 0x40, 0xa3, 0xe3, 0x4b, 0xf7, 0xdb,
]),
)
.set(
-3,
Buffer.from([
0x93, 0xc3, 0xdf, 0xd7, 0x10, 0xee, 0x2c, 0xb4, 0x43, 0x4e, 0x27, 0xd5, 0x42, 0x50, 0x2e, 0x82, 0xef, 0x5f,
0x2c, 0xa0, 0xef, 0xe8, 0xde, 0xd8, 0x1d, 0xce, 0x9d, 0xad, 0xbc, 0x1a, 0x40, 0x2c,
]),
);
const pem = await cosekey.KeyParser.cose2pem(coseMap);
// -----BEGIN PUBLIC KEY-----
// MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE52TrrTvwA4dGmbfFQc6UeWoXrNZT
// 61goui9Ao+NL99uTw9/XEO4stENOJ9VCUC6C718soO/o3tgdzp2tvBpALA==
// -----END PUBLIC KEY-----
`
Of course you can parse PEM to COSE using KeyParser#pem2cose.
More details see API Reference
$3
This module provide Verifier class to verify data using signature and key(COSE, JWK or PEM).
#### COSE
`js
import cosekey from 'parse-cosekey';
const data = Buffer.from([0xaa, 0xbb, 0xcc]);
const signature = Buffer.from([0x11, 0x22, 0x33]);
const cose = new Map()
.set(1, 2)
.set(3, -7)
.set(-1, 1)
.set(
-2,
Buffer.from([0xaa, 0xbb, 0xcc]),
)
.set(
-3,
Buffer.from([0x11, 0x22, 0x33]),
);
const result = await cosekey.Verifier.verifyWithCOSEKey(data, signature, cose);
`
#### JWK
`js
import cosekey from 'parse-cosekey';
const data = Buffer.from([0xaa, 0xbb, 0xcc]);
const signature = Buffer.from([0x11, 0x22, 0x33]);
const jwk = {
kty: 'EC',
alg: 'ES256',
crv: 'P-256',
x: 'MKBCTNIcKUSDii11ySs3526iDZ8AiTo7Tu6KPAqv7D4',
y: '4Etl6SRW2YiLUrN5vfvVHuhp7x8PxltmWWlbbM4IFyM',
};
const result = await cosekey.Verifier.verifyWithJWK(data, signature, jwk);
`
#### PEM
`js
import cosekey from 'parse-cosekey';
const data = Buffer.from([0xaa, 0xbb, 0xcc]);
const signature = Buffer.from([0x11, 0x22, 0x33]);
const pem = -----BEGIN PUBLIC KEY-----
;
const result = await cosekey.Verifier.verifyWithPEM(data, signature, pem);
``