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* @omsmith
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								node_modules/ecdsa-sig-formatter/README.md
									
									
									
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 | 
			
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# ecdsa-sig-formatter
 | 
			
		||||
 | 
			
		||||
[](https://travis-ci.org/Brightspace/node-ecdsa-sig-formatter) [](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.
 | 
			
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 | 
			
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3. Ensure that all tests pass with `npm test`
 | 
			
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 | 
			
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4. `rebase` your changes against master. *Do not merge*.
 | 
			
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 | 
			
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5. Submit a pull request to this repository. Wait for tests to run and someone
 | 
			
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   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": "C:\\Users\\matia\\Documents\\GitHub\\FutoX-Musix\\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"
 | 
			
		||||
}
 | 
			
		||||
							
								
								
									
										17
									
								
								node_modules/ecdsa-sig-formatter/src/ecdsa-sig-formatter.d.ts
									
									
									
										generated
									
									
										vendored
									
									
										Normal file
									
								
							
							
						
						
									
										17
									
								
								node_modules/ecdsa-sig-formatter/src/ecdsa-sig-formatter.d.ts
									
									
									
										generated
									
									
										vendored
									
									
										Normal file
									
								
							@@ -0,0 +1,17 @@
 | 
			
		||||
/// <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
 | 
			
		||||
}
 | 
			
		||||
							
								
								
									
										187
									
								
								node_modules/ecdsa-sig-formatter/src/ecdsa-sig-formatter.js
									
									
									
										generated
									
									
										vendored
									
									
										Normal file
									
								
							
							
						
						
									
										187
									
								
								node_modules/ecdsa-sig-formatter/src/ecdsa-sig-formatter.js
									
									
									
										generated
									
									
										vendored
									
									
										Normal file
									
								
							@@ -0,0 +1,187 @@
 | 
			
		||||
'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
 | 
			
		||||
};
 | 
			
		||||
							
								
								
									
										23
									
								
								node_modules/ecdsa-sig-formatter/src/param-bytes-for-alg.js
									
									
									
										generated
									
									
										vendored
									
									
										Normal file
									
								
							
							
						
						
									
										23
									
								
								node_modules/ecdsa-sig-formatter/src/param-bytes-for-alg.js
									
									
									
										generated
									
									
										vendored
									
									
										Normal file
									
								
							@@ -0,0 +1,23 @@
 | 
			
		||||
'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;
 | 
			
		||||
		Reference in New Issue
	
	Block a user