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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | 1x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 1x 11x 11x 30x 11x 11x 11x 11x 11x 11x 11x 11x 11x 10x 9x 9x 9x 12x 8x 8x 8x 11x 9x 1x | import forge from "node-forge";
import { VerifyPDFError } from "./VerifyPDFError.js";
import { extractCertificatesDetails } from "./certificateDetails.js";
import {
authenticateSignature,
checkForSubFilter,
extractSignature,
getClientCertificate,
getMessageFromSignature,
isCertsExpired,
preparePDF,
sortCertificateChain,
} from "./helpers/index.js";
/**
* @typedef SignatureMeta
* @property {string|null} [contactInfo]
* @property {string|null} [reason]
* @property {string|null} [location]
* @property {string|null} [name]
*/
/**
* @param {forge.Bytes} signature
* @param {Uint8Array} signedData
* @param {SignatureMeta} [signatureMeta]
*/
const verify = (signature, signedData, signatureMeta) => {
const message = getMessageFromSignature(signature);
const {
certificates,
rawCapture: {
signature: sig,
authenticatedAttributes: attrs,
digestAlgorithm,
},
} = message;
const hashAlgorithmOid = forge.asn1.derToOid(digestAlgorithm);
/**
* @type {keyof typeof forge.md.algorithms}
*/
// @ts-expect-error IDK
const hashAlgorithm = forge.pki.oids[hashAlgorithmOid].toLowerCase();
const set = forge.asn1.create(
forge.asn1.Class.UNIVERSAL,
forge.asn1.Type.SET,
true,
attrs,
);
const clientCertificate = getClientCertificate(certificates);
const digest = forge.md[hashAlgorithm]
.create()
.update(forge.asn1.toDer(set).data)
.digest()
.getBytes();
/**
* @type {forge.pki.rsa.PublicKey | undefined}
*/
// @ts-expect-error IDK
const publicKey = clientCertificate?.publicKey;
const validAuthenticatedAttributes = publicKey?.verify(digest, sig);
if (!validAuthenticatedAttributes) {
throw new VerifyPDFError(
"Wrong authenticated attributes",
VerifyPDFError.Type.VERIFY_SIGNATURE,
);
}
const messageDigestAttr = forge.pki.oids.messageDigest;
const fullAttrDigest = attrs.find(
/**
* @param {forge.pki.Attribute} attr
*/
(attr) => forge.asn1.derToOid(attr.value[0].value) === messageDigestAttr,
);
const attrDigest = fullAttrDigest.value[1].value[0].value;
const dataDigest = forge.md[hashAlgorithm]
.create()
.update(Buffer.from(signedData).toString("latin1"))
.digest()
.getBytes();
const integrity = dataDigest === attrDigest;
const sortedCerts = sortCertificateChain(certificates);
const parsedCerts = extractCertificatesDetails(sortedCerts);
const authenticity = authenticateSignature(sortedCerts);
const expired = isCertsExpired(sortedCerts);
return {
verified: integrity && authenticity && !expired,
authenticity,
integrity,
expired,
meta: { certs: parsedCerts, signatureMeta },
};
};
/**
* @param {Uint8Array} pdf
*/
export default (pdf) => {
const pdfBuffer = preparePDF(pdf);
checkForSubFilter(pdfBuffer);
try {
const { signatureStr, signedData, signatureMeta } =
extractSignature(pdfBuffer);
const signatures = signedData.map((signed, index) => {
return verify(signatureStr[index] ?? "", signed, signatureMeta[index]);
});
return {
verified: signatures.every((o) => o.verified === true),
authenticity: signatures.every((o) => o.authenticity === true),
integrity: signatures.every((o) => o.integrity === true),
expired: signatures.some((o) => o.expired === true),
signatures,
};
} catch (error) {
return {
verified: false,
message:
// @ts-expect-error error
error.message,
error,
};
}
};
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