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node_modules/ecdsa-sig-formatter/src/ecdsa-sig-formatter.d.ts

@@ -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
+}

node_modules/ecdsa-sig-formatter/src/ecdsa-sig-formatter.js

@@ -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
+};

node_modules/ecdsa-sig-formatter/src/param-bytes-for-alg.js

@@ -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;