Namespace IronPdf.Signing

Classes

PdfSignature

A class that represents a PDF signing certificate (.PFX or .p12) format which can be used to digitally sign a PDF. This protecting it from alteration, Also PKCS11 converted to 12.

PdfSignatureExtensions

Extension methods for PdfSignature to sign PDF files directly without loading into memory. Provides convenient file-based signing operations for batch processing.

Example - Sign PDF file:

var signature = new PdfSignature("certificate.pfx", "password");
signature.SignPdfFile("document.pdf", removeOldSignatures: true);

PdfSignatureImage

PDF digital signature image

SignatureHashAlgorithmExtensions

Helpers for SignatureHashAlgorithms.

SignatureHashAlgorithms

Hashing algorithms available for the PKCS#7/CMS signature digest (the "Hash Algorithm" Adobe Reader shows under Signature Details). SHA-256 is the modern default; SHA-1 remains selectable only for compatibility with legacy validators and is cryptographically weak.

SignaturePermissions

Permission options for a PDF document which is digitally signed

TimestampHashAlgorithmExtensions

Helpers for TimestampHashAlgorithms.

TimestampHashAlgorithms

Timestamp hashing algorithms