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Digital signatures of PDF and Encrypt/Decrypt PDF, on JavaScript.

Notice

This library override pdf-lib some functions. Maybe comatible with original ,but not limited to the warranties. Using "@ts-ignore" to access pdf-lib private properties | functions, which may not fit your policy. Not adequately tested,"NOT LIMITED TO THE WARRANTIES"

Thanks

The issue post at pdf-lib on how to sign was helpful. PR#1015 on pdf-lib about encryption was helpful.

Usage

pdfSigner Class

import {pdfSigner} from "spdf";
const signer = new pdfSigner();

Member

• New Sign
• Add Sign
• Add TimeStamp
• Add DSS
• ADD LastTimeStamp-DSS

Global

import {decryptPDF, encryptPDF} from "spdf";

Member

• encryptPDF
• decryptPDF

newSign

• Create a signed PDF.

pdfSigner.newSing: (pdf:string | Uint8Array | ArrayBuffer, certs: CERTIFICATEs, options?: newSignOptions) => Promise<Uint8Array>

CERTIFICATEs

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | signer.cert | string|Uint8Array | Requested | X509 PEM or DER | | signer.key | string|Uint8Array | Requested | RSA,DSA,ECDSA private key PKCS#5,#8 PEM or DER | | signer.keyPass | string | Option | If key is encrypted,set this. | | caCerts | Array<string|Uint8Array> | Optional | If embedded CA certificates in signature, set this. |

Import Certificate and Key is dependency on jsrsasign,Support format look jsrsasign reference.

newSignOptions

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | openPassword | string | If pdf is encryptedRequested | OwnerPassword required | | hashAlg | 'sha1''sha256''sha384''sha512' | OptionDEFAULT:'sha256' | Sign hash algorithm. | | encrypt | EncryptOptions | Optional | If request PDF output encrypt,set this. | | signer | SignerOptions | Optional | Set of the signing. | | signature | signature | Optional | Visible signature. | | embeddedTimeStamp | TSASarver | Optional | If request embedded TimeStamp in signature, set this. | | DocMDP | 1|2|3 | Optional | The access permissions granted for document.|

The value of DocMDP is quoted to the ISO-32000-1. 1.No changes to the document shall be permitted; any change to the document shall invalidate the signature.2.Permitted changes shall be filling in forms, instantiating page templates, and signing; other changes shall invalidate the signature.3.Permitted changes shall be the same as for 2, as well as annotation creation, deletion, and modification; other changes shall invalidate the signature.

EncryptOptions

see

SignerOptions

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | Name | string | Optional | The name of the person or authority signing the document. | | Location | string | Optional | The CPU host name or physical location of the signing. | | Reason | string | Optional | The reason for the signing. | | ContactInfo | string | Optional | Information provided by the signer to enable a recipient to contact the signer to verify the signature. |

signature

Visible signature.

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | page | number | Requested | one-based,0 is invalid. | | rect | RECT | Requested | Signature area-rect. | | text | SignText | Optional | Visible text. | | image | Uint8Array | Optional | JPEG or PNG visible image. | | reverseImgTxt | boolean | OptionalDEFAULT:false | false:Text above imagetrue:Image above text. |

RECT

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | x | number | Requested | Distance left mm | | y | number | Requested | Distance top mm | | w | number | Requested | Width mm | | w | number | Requested | Height mm |

SignText

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | txt | string | Requested | Visible text. | | size | number | OptionalDEFAULT:10 | Text size. | | x | number | OptionalDEFAULT:0 | Distance signatureRect-Left. | | y | number | OptionalDEFAULT:0 | Distance signatureRect-Bouttom. | | fontdata | Uint8Array | OptionalDEFAULT:Courier | Text font data. |

TSASarver

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | url | string | Requested | TSA Sarver URL | | hashAlg | 'sha1''sha256''sha384''sha512' | OptionalDEFAULT:'sha256' | TimeStamp hash algorithm. | | certSize | number | OptionalDEFAULT:6144 | Size to be allocated for Timestamp certificate |

Not available in web browsers due to CORS.

• Allocate Size PDF signatures must be pre-allocated space. The size of the space is estimated from the certificate and allocated, but the timestamp cannot check the size of the certificate in advance. If there is not enough space, the timestamp will be set to a sufficient size based on the results obtained once, but it will need to be signed again. In other words, if there is not enough space, the timestamping will be requested twice. If the area is large enough, it cannot be reduced.

Add sign

• Add(inculumental) a signature. Add a new signature without modifying the PDF document. Existing content, including signatures, will be maintained. If encrypted,encryption is maintained.

pdfSigner.pdfSigner.inculumentalSign: (pdf:string | Uint8Array | ArrayBuffer, certs: CERTIFICATEs, options?: inclumentalSignOptions) => Promise<Uint8Array>

CERTIFICATEs

See

inclumentalSignOptions

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | openPassword | string | If pdf is encryptedRequested | If userpassword,allowed create signature fields. | | hashAlg | 'sha1''sha256''sha384''sha512' | OptionDEFAULT:'sha256' | Sign hash algorithm. | | signer | SignerOptions | Optional | Set of the signing. | | signature | signature | Optional | Visible signature. | | embeddedTimeStamp | TSASarver | Optional | If request embedded TimeStamp in signature, set this. |

Add TimeStamp

• Add(inculumental) a Timestamp. Add a new timestamp without modifying the PDF document. Existing content, including signatures, will be maintained. If encrypted,encryption is maintained.

pdfSigner.inculumentalTimeStamp: (pdf:string | Uint8Array | ArrayBuffer, tsaPram: timeStampOptions) => Promise<Uint8Array>

timeStampOptions

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | TSA | TSASarver | Requested | | | openPassword | string | If pdf is encryptedRequested | If userpassword,allowed create signature fields. |

Add DSS

• Add(inculumental) a DSS. Embeds the verification information of the currently embedded certificate. Add a DSS without modifying the PDF document. Existing content, including signatures, will be maintained. If encrypted,encryption is maintained. Simply, it enables LTV. Processes all signatures, if you have already embedded the DSS, you will need to embed the DSS for the added timestamp only. See ADD LastTimeStamp-DSS

pdfSigner.addDSSAllCerts: (pdf:string | Uint8Array | ArrayBuffer, options?: addDssOptions) => Promise<Uint8Array>

addDssOptions

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | TSA | TSASarver | Requested | | | openPassword | string | If pdf is encryptedRequested | If userpassword,allowed create signature fields. | | caCerts | Array<string|Uint8Array> | Optional | Add CA Certificates | | crls | Array<string|Uint8Array> | Optional | Add CRLs | | ignoreMissingTrustChain | boolean | Optional | If true, If trust chain cannot traced,not throw error. | | ignoreRevokedCert | boolean | Optional | If true, If verification fails or is unknown,not throw error. |

To obtain verification information, CRLs are obtained, OCSP queries are made, and CA certificates are acquired. Not available in web browsers due to CORS.

ADD LastTimeStamp-DSS

• Add(inculumental) a LastTimeStamp-DSS. Embeds the verification information of the currently embedded certificate. Add a DSS without modifying the PDF document. Existing content, including signatures, will be maintained. If encrypted,encryption is maintained. Simply, Extended document Time-stamp.

pdfSigner.addDSSLastTimeStamp: (pdf:string | Uint8Array | ArrayBuffer, options?: addDssOptions) => Promise<Uint8Array>

addDssOptions

see

encryptPDF

const encryptPDF: (pdf: string | Uint8Array | ArrayBuffer, encryptOptions: encryptOptions) => Promise<Uint8Array>

encryptOptions

| Name | Type | Attribute | Description | | --- | --- | --- | --- | | userPassword | string | Requested | If no-userpassword, value is ''(0 length string) | | ownerPassword | string | Requested | | | permission | UserPermissions | Requested | If all deny,value is {} | | keyBits | 128|256 | OptionalDEFAULT:256 | Support AES only. |

UserPermission

UserPermission default all deny. | Name | Type | Attribute | Description | | --- | --- | --- | --- | | printing | false|'lowResolution' | 'highResolution' | Optional | Printing Permission | | modifying | boolean | Optional | Modify Content Permission | | copying | boolean | Optional | Copy or otherwise extract text and graphics from document | | annotating | boolean | Optional | Permission to add or modify text annotations | | fillingForms | boolean | Optional | Fill in existing interactive form fields (including signature fields) | | contentAccessibility | boolean | Optional | Extract text and graphics (in support of accessibility to users with disabilities or for other purposes) | | documentAssembly | boolean | Optional | Assemble the document (insert, rotate or delete pages and create bookmarks or thumbnail images) |

decryptPDF

decryptPDF: (pdf: string | Uint8Array | ArrayBuffer, ownerPassword: string) => Promise<Uint8Array>

Use pdf-lib with encryption support.

Import "PDFDocument" from 'pdf-lib_patch' instead of 'pdf-lib'.

exsample

This then,is

import { PDFDocument, rgb} from "pdf-lib";
const pdfData = await PDFDocument.load(readFileSync("input.pdf"));
const page1 = pdfData.getPage(0);
page1.drawCircle({ "opacity":1, x:100, y:740,size:100,color:rgb(0.8,0.2,0.2)});
page1.drawCircle({ "opacity":1, x:150, y:740,size:100,color:rgb(0.2,0.8,0.2)});
writeFileSync("output.pdf",await pdfData.save());

do this.

import {rgb} from "pdf-lib";
import {PDFDocument} from "pdf-lib_patch";
const pdfData = await PDFDocument.load(readFileSync("input.pdf"),{"password":"ownerpassword"});
const page1 = pdfData.getPage(0);
page1.drawCircle({ "opacity":1, x:100, y:740,size:100,color:rgb(0.8,0.2,0.2)});
page1.drawCircle({ "opacity":1, x:150, y:740,size:100,color:rgb(0.2,0.8,0.2)});
pdfData.encrypt({
  "keyBits":256,
  "userPassword":"",
  "ownerPassword":"newownerpassword",
  "permission":{"printing":"highResolution"}
});
writeFileSync("output.pdf",await pdfData.save({"useObjectStreams":false}));
//{"useObjectStreams":false} is requested,because pdf broken.