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* @omsmith

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# ecdsa-sig-formatter
[![Build Status](https://travis-ci.org/Brightspace/node-ecdsa-sig-formatter.svg?branch=master)](https://travis-ci.org/Brightspace/node-ecdsa-sig-formatter) [![Coverage Status](https://coveralls.io/repos/Brightspace/node-ecdsa-sig-formatter/badge.svg)](https://coveralls.io/r/Brightspace/node-ecdsa-sig-formatter)
Translate between JOSE and ASN.1/DER encodings for ECDSA signatures
## Install
```sh
npm install ecdsa-sig-formatter --save
```
## Usage
```js
var format = require('ecdsa-sig-formatter');
var derSignature = '..'; // asn.1/DER encoded ecdsa signature
var joseSignature = format.derToJose(derSignature);
```
### API
---
#### `.derToJose(Buffer|String signature, String alg)` -> `String`
Convert the ASN.1/DER encoded signature to a JOSE-style concatenated signature.
Returns a _base64 url_ encoded `String`.
* If _signature_ is a `String`, it should be _base64_ encoded
* _alg_ must be one of _ES256_, _ES384_ or _ES512_
---
#### `.joseToDer(Buffer|String signature, String alg)` -> `Buffer`
Convert the JOSE-style concatenated signature to an ASN.1/DER encoded
signature. Returns a `Buffer`
* If _signature_ is a `String`, it should be _base64 url_ encoded
* _alg_ must be one of _ES256_, _ES384_ or _ES512_
## Contributing
1. **Fork** the repository. Committing directly against this repository is
highly discouraged.
2. Make your modifications in a branch, updating and writing new unit tests
as necessary in the `spec` directory.
3. Ensure that all tests pass with `npm test`
4. `rebase` your changes against master. *Do not merge*.
5. Submit a pull request to this repository. Wait for tests to run and someone
to chime in.
### Code Style
This repository is configured with [EditorConfig][EditorConfig] and
[ESLint][ESLint] rules.
[EditorConfig]: http://editorconfig.org/
[ESLint]: http://eslint.org

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{
"_from": "ecdsa-sig-formatter@1.0.11",
"_id": "ecdsa-sig-formatter@1.0.11",
"_inBundle": false,
"_integrity": "sha512-nagl3RYrbNv6kQkeJIpt6NJZy8twLB/2vtz6yN9Z4vRKHN4/QZJIEbqohALSgwKdnksuY3k5Addp5lg8sVoVcQ==",
"_location": "/ecdsa-sig-formatter",
"_phantomChildren": {},
"_requested": {
"type": "version",
"registry": true,
"raw": "ecdsa-sig-formatter@1.0.11",
"name": "ecdsa-sig-formatter",
"escapedName": "ecdsa-sig-formatter",
"rawSpec": "1.0.11",
"saveSpec": null,
"fetchSpec": "1.0.11"
},
"_requiredBy": [
"/jwa"
],
"_resolved": "https://registry.npmjs.org/ecdsa-sig-formatter/-/ecdsa-sig-formatter-1.0.11.tgz",
"_shasum": "ae0f0fa2d85045ef14a817daa3ce9acd0489e5bf",
"_spec": "ecdsa-sig-formatter@1.0.11",
"_where": "/Users/josh.burman/Projects/braid/node_modules/jwa",
"author": {
"name": "D2L Corporation"
},
"bugs": {
"url": "https://github.com/Brightspace/node-ecdsa-sig-formatter/issues"
},
"bundleDependencies": false,
"dependencies": {
"safe-buffer": "^5.0.1"
},
"deprecated": false,
"description": "Translate ECDSA signatures between ASN.1/DER and JOSE-style concatenation",
"devDependencies": {
"bench": "^0.3.6",
"chai": "^3.5.0",
"coveralls": "^2.11.9",
"eslint": "^2.12.0",
"eslint-config-brightspace": "^0.2.1",
"istanbul": "^0.4.3",
"jwk-to-pem": "^1.2.5",
"mocha": "^2.5.3",
"native-crypto": "^1.7.0"
},
"homepage": "https://github.com/Brightspace/node-ecdsa-sig-formatter#readme",
"keywords": [
"ecdsa",
"der",
"asn.1",
"jwt",
"jwa",
"jsonwebtoken",
"jose"
],
"license": "Apache-2.0",
"main": "src/ecdsa-sig-formatter.js",
"name": "ecdsa-sig-formatter",
"repository": {
"type": "git",
"url": "git+ssh://git@github.com/Brightspace/node-ecdsa-sig-formatter.git"
},
"scripts": {
"check-style": "eslint .",
"pretest": "npm run check-style",
"report-cov": "cat ./coverage/lcov.info | coveralls",
"test": "istanbul cover --root src _mocha -- spec"
},
"typings": "./src/ecdsa-sig-formatter.d.ts",
"version": "1.0.11"
}

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/// <reference types="node" />
declare module "ecdsa-sig-formatter" {
/**
* Convert the ASN.1/DER encoded signature to a JOSE-style concatenated signature. Returns a base64 url encoded String.
* If signature is a String, it should be base64 encoded
* alg must be one of ES256, ES384 or ES512
*/
export function derToJose(signature: Buffer | string, alg: string): string;
/**
* Convert the JOSE-style concatenated signature to an ASN.1/DER encoded signature. Returns a Buffer
* If signature is a String, it should be base64 url encoded
* alg must be one of ES256, ES384 or ES512
*/
export function joseToDer(signature: Buffer | string, alg: string): Buffer
}

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'use strict';
var Buffer = require('safe-buffer').Buffer;
var getParamBytesForAlg = require('./param-bytes-for-alg');
var MAX_OCTET = 0x80,
CLASS_UNIVERSAL = 0,
PRIMITIVE_BIT = 0x20,
TAG_SEQ = 0x10,
TAG_INT = 0x02,
ENCODED_TAG_SEQ = (TAG_SEQ | PRIMITIVE_BIT) | (CLASS_UNIVERSAL << 6),
ENCODED_TAG_INT = TAG_INT | (CLASS_UNIVERSAL << 6);
function base64Url(base64) {
return base64
.replace(/=/g, '')
.replace(/\+/g, '-')
.replace(/\//g, '_');
}
function signatureAsBuffer(signature) {
if (Buffer.isBuffer(signature)) {
return signature;
} else if ('string' === typeof signature) {
return Buffer.from(signature, 'base64');
}
throw new TypeError('ECDSA signature must be a Base64 string or a Buffer');
}
function derToJose(signature, alg) {
signature = signatureAsBuffer(signature);
var paramBytes = getParamBytesForAlg(alg);
// the DER encoded param should at most be the param size, plus a padding
// zero, since due to being a signed integer
var maxEncodedParamLength = paramBytes + 1;
var inputLength = signature.length;
var offset = 0;
if (signature[offset++] !== ENCODED_TAG_SEQ) {
throw new Error('Could not find expected "seq"');
}
var seqLength = signature[offset++];
if (seqLength === (MAX_OCTET | 1)) {
seqLength = signature[offset++];
}
if (inputLength - offset < seqLength) {
throw new Error('"seq" specified length of "' + seqLength + '", only "' + (inputLength - offset) + '" remaining');
}
if (signature[offset++] !== ENCODED_TAG_INT) {
throw new Error('Could not find expected "int" for "r"');
}
var rLength = signature[offset++];
if (inputLength - offset - 2 < rLength) {
throw new Error('"r" specified length of "' + rLength + '", only "' + (inputLength - offset - 2) + '" available');
}
if (maxEncodedParamLength < rLength) {
throw new Error('"r" specified length of "' + rLength + '", max of "' + maxEncodedParamLength + '" is acceptable');
}
var rOffset = offset;
offset += rLength;
if (signature[offset++] !== ENCODED_TAG_INT) {
throw new Error('Could not find expected "int" for "s"');
}
var sLength = signature[offset++];
if (inputLength - offset !== sLength) {
throw new Error('"s" specified length of "' + sLength + '", expected "' + (inputLength - offset) + '"');
}
if (maxEncodedParamLength < sLength) {
throw new Error('"s" specified length of "' + sLength + '", max of "' + maxEncodedParamLength + '" is acceptable');
}
var sOffset = offset;
offset += sLength;
if (offset !== inputLength) {
throw new Error('Expected to consume entire buffer, but "' + (inputLength - offset) + '" bytes remain');
}
var rPadding = paramBytes - rLength,
sPadding = paramBytes - sLength;
var dst = Buffer.allocUnsafe(rPadding + rLength + sPadding + sLength);
for (offset = 0; offset < rPadding; ++offset) {
dst[offset] = 0;
}
signature.copy(dst, offset, rOffset + Math.max(-rPadding, 0), rOffset + rLength);
offset = paramBytes;
for (var o = offset; offset < o + sPadding; ++offset) {
dst[offset] = 0;
}
signature.copy(dst, offset, sOffset + Math.max(-sPadding, 0), sOffset + sLength);
dst = dst.toString('base64');
dst = base64Url(dst);
return dst;
}
function countPadding(buf, start, stop) {
var padding = 0;
while (start + padding < stop && buf[start + padding] === 0) {
++padding;
}
var needsSign = buf[start + padding] >= MAX_OCTET;
if (needsSign) {
--padding;
}
return padding;
}
function joseToDer(signature, alg) {
signature = signatureAsBuffer(signature);
var paramBytes = getParamBytesForAlg(alg);
var signatureBytes = signature.length;
if (signatureBytes !== paramBytes * 2) {
throw new TypeError('"' + alg + '" signatures must be "' + paramBytes * 2 + '" bytes, saw "' + signatureBytes + '"');
}
var rPadding = countPadding(signature, 0, paramBytes);
var sPadding = countPadding(signature, paramBytes, signature.length);
var rLength = paramBytes - rPadding;
var sLength = paramBytes - sPadding;
var rsBytes = 1 + 1 + rLength + 1 + 1 + sLength;
var shortLength = rsBytes < MAX_OCTET;
var dst = Buffer.allocUnsafe((shortLength ? 2 : 3) + rsBytes);
var offset = 0;
dst[offset++] = ENCODED_TAG_SEQ;
if (shortLength) {
// Bit 8 has value "0"
// bits 7-1 give the length.
dst[offset++] = rsBytes;
} else {
// Bit 8 of first octet has value "1"
// bits 7-1 give the number of additional length octets.
dst[offset++] = MAX_OCTET | 1;
// length, base 256
dst[offset++] = rsBytes & 0xff;
}
dst[offset++] = ENCODED_TAG_INT;
dst[offset++] = rLength;
if (rPadding < 0) {
dst[offset++] = 0;
offset += signature.copy(dst, offset, 0, paramBytes);
} else {
offset += signature.copy(dst, offset, rPadding, paramBytes);
}
dst[offset++] = ENCODED_TAG_INT;
dst[offset++] = sLength;
if (sPadding < 0) {
dst[offset++] = 0;
signature.copy(dst, offset, paramBytes);
} else {
signature.copy(dst, offset, paramBytes + sPadding);
}
return dst;
}
module.exports = {
derToJose: derToJose,
joseToDer: joseToDer
};

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'use strict';
function getParamSize(keySize) {
var result = ((keySize / 8) | 0) + (keySize % 8 === 0 ? 0 : 1);
return result;
}
var paramBytesForAlg = {
ES256: getParamSize(256),
ES384: getParamSize(384),
ES512: getParamSize(521)
};
function getParamBytesForAlg(alg) {
var paramBytes = paramBytesForAlg[alg];
if (paramBytes) {
return paramBytes;
}
throw new Error('Unknown algorithm "' + alg + '"');
}
module.exports = getParamBytesForAlg;