Libraries tagged by digital signature

Pure PHP implementation of libsodium; uses the PHP extension if it exists

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fast openSSL-compatible implementation of the Elliptic Curve Digital Signature Algorithm (ECDSA)

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Laravel package for of E-Signature with Signature Pad and Digital Certified Sign with TCPDF

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The most advanced, driver-based PDF manipulation library for PHP v3.0. Supports Ghostscript, Chrome Headless (HTML to PDF), OpenSSL/FPDI (Signing), and PDFtk (Forms).

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Json Web Signature (JWS) PHP implementation

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Sign XML Documents with Digital Signatures

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A PHP library for signing XML documents using digital signatures

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An SDK for using eBay's APIs that require a digital signature

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PHP library to create and embed digital signatures (PKCS#7 / CAdES / PAdES) in PDF documents

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Open-source PHP library for PDF digital signing with multiple signatures, RFC3161 timestamping, PAdES profiles, and PDF protection

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MIT alternative to mpdf (GPL) and FPDI: pure-PHP PDF toolkit — generate (HTML/CSS input, fluent builders, low-level emission, 16 barcode formats, 9 chart types, TTF embedding, AcroForm, PDF/A and PDF/X), digital signatures (PAdES and GOST, visible stamps, timestamps, long-term validation, signing existing PDFs and outside the server, validation), plus read and merge existing PDFs (append/reorder pages, stamp overlays, FPDI-style import, encrypted input).

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Phactor is a high-performance PHP implementation of the elliptic curve math functions required to generate & verify private/public (asymmetric) EC keypairs and ECDSA signatures based on secp256k1 curve parameters. This library also includes a class to generate Service Identification Numbers (SINs) based on the published Identity Protocol v1 spec.

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Sign and verify PSR-7 HTTP messages with HMAC and RSA keys

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Zoho Sign's v1 api wrapper SDK in PHP

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PHP implementation of minisign, based on libsodium

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