SRI Hash Generator

. If file modified (CDN compromise, MITM attack), hash won't match - browser blocks execution. Benefits: prevent CDN compromise, detect file modifications, supply chain security, compliance requirements (PCI DSS). Required for: external resources from CDN, third-party libraries, cross-origin files. W3C standard, supported by all modern browsers. This tool generates SRI hashes for any JS/CSS file instantly."}},{"@type":"Question","name":"Which hash algorithm should I use for SRI (SHA-256, SHA-384, or SHA-512)?","acceptedAnswer":{"@type":"Answer","text":"SRI supports SHA-256, SHA-384, SHA-512. Recommendations: SHA-384 most common (balance of security and size), SHA-512 maximum security (longer hash), SHA-256 faster but less secure (still acceptable). You can specify multiple: integrity=\"sha384-abc123 sha512-def456\" (browser uses strongest it supports). Performance: negligible difference for small files, SHA-384 recommended by most CDNs (jsdelivr, cdnjs). Hash format: algorithm-base64hash. Example: \"sha384-oqVuAfXRKap7fdgcCY5uykM6+R9GqQ8K/uxy9rx7HNQlGYl1kPzQho1wx4JwY8wC\". Security: all three are cryptographically secure for SRI purpose. This tool generates all three algorithms - choose based on your security policy."}},{"@type":"Question","name":"How do I implement SRI for third-party CDN resources?","acceptedAnswer":{"@type":"Answer","text":"Add integrity and crossorigin attributes to script/link tags. Steps: 1) Get hash from CDN (many provide it) or generate with this tool. 2) Add to HTML: . 3) Test: browser console shows error if hash mismatch. Requirements: crossorigin attribute required (CORS), HTTPS only (SRI doesn't work on HTTP), same hash for same file (cache-friendly). Common CDNs with SRI: jsdelivr.com (shows SRI hash), cdnjs.com (copy SRI button), unpkg.com (generate hash). For self-hosted: generate hash during build, include in HTML templates. This tool generates production-ready SRI snippets."}},{"@type":"Question","name":"What happens if the SRI hash doesn't match?","acceptedAnswer":{"@type":"Answer","text":"Browser blocks resource execution and fires error event. Console shows: \"Failed to find a valid digest in the 'integrity' attribute for resource 'URL'\". Consequences: script doesn't run (may break page functionality), CSS doesn't apply (visual issues), onerror event fires (can catch with JavaScript). Common causes: file updated on CDN (new version), typo in hash value, wrong file URL, CORS misconfiguration (missing crossorigin). Debugging: check browser console, verify file content matches hash, regenerate hash, ensure CORS headers present. Fallback strategy: - no integrity attribute. External: