{"id":7092,"date":"2024-03-14T05:04:20","date_gmt":"2024-03-14T05:04:20","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-use-the-php-openssl_decrypt-function\/"},"modified":"2025-08-02T11:55:44","modified_gmt":"2025-08-02T11:55:44","slug":"how-to-use-the-php-openssl_decrypt-function","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-use-the-php-openssl_decrypt-function\/","title":{"rendered":"PHP openssl_decrypt: Secure Data Decryption"},"content":{"rendered":"<p>In PHP, you can utilize the openssl_decrypt function to decrypt encrypted data. The basic syntax of this function is as follows:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">string<\/span> <span class=\"hljs-title function_ invoke__\">openssl_decrypt<\/span> ( <span class=\"hljs-keyword\">string<\/span> <span class=\"hljs-variable\">$data<\/span> , <span class=\"hljs-keyword\">string<\/span> <span class=\"hljs-variable\">$method<\/span> , <span class=\"hljs-keyword\">string<\/span> <span class=\"hljs-variable\">$key<\/span> [, <span class=\"hljs-keyword\">int<\/span> <span class=\"hljs-variable\">$options<\/span> = <span class=\"hljs-number\">0<\/span> [, <span class=\"hljs-keyword\">string<\/span> <span class=\"hljs-variable\">$iv<\/span> = <span class=\"hljs-string\">\"\"<\/span> [, <span class=\"hljs-keyword\">string<\/span> <span class=\"hljs-variable\">$tag<\/span> = <span class=\"hljs-string\">\"\"<\/span> [, <span class=\"hljs-keyword\">string<\/span> <span class=\"hljs-variable\">$aad<\/span> = <span class=\"hljs-string\">\"\"<\/span> [, <span class=\"hljs-keyword\">int<\/span> <span class=\"hljs-variable\">$tag_length<\/span> = <span class=\"hljs-number\">16<\/span> ]]]]] )\r\n<\/code><\/pre>\n<p>Explanation of parameters:<\/p>\n<ol>\n<li>Data: Data to decrypt.<\/li>\n<li>encryption algorithm<\/li>\n<li>key: the key needed for decryption<\/li>\n<li>encryption option (optional, default is 0)<\/li>\n<li>iv: Initialization vector (optional, default is an empty string)<\/li>\n<li>tag: Certification label (optional, default is an empty string)<\/li>\n<li>aad: Additional authentication data (optional, default is an empty string)<\/li>\n<li>tag_length: Length of authentication tag (optional, default is 16).<\/li>\n<\/ol>\n<p>I am unable to attend the meeting because I have a prior commitment. -> I can&#8217;t make it to the meeting because I already have something else scheduled.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-variable\">$encrypted_data<\/span> = <span class=\"hljs-string\">\"U2FsdGVkX1+m3l8g5dO\/TDCBQZgZ6QwH9L3soBUXKo=\"<\/span>;\r\n<span class=\"hljs-variable\">$key<\/span> = <span class=\"hljs-string\">\"mysecretkey\"<\/span>;\r\n<span class=\"hljs-variable\">$method<\/span> = <span class=\"hljs-string\">\"AES-256-CBC\"<\/span>;\r\n<span class=\"hljs-variable\">$decrypted_data<\/span> = <span class=\"hljs-title function_ invoke__\">openssl_decrypt<\/span>(<span class=\"hljs-variable\">$encrypted_data<\/span>, <span class=\"hljs-variable\">$method<\/span>, <span class=\"hljs-variable\">$key<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-string\">\"1234567890123456\"<\/span>);\r\n\r\n<span class=\"hljs-keyword\">echo<\/span> <span class=\"hljs-variable\">$decrypted_data<\/span>;\r\n<\/code><\/pre>\n<p>In the example above, we decrypt the encrypted data using the AES-256-CBC algorithm and the key &#8220;mysecretkey&#8221;. We also provide a 16-byte initialization vector. The decrypted data will be stored in the variable $decrypted_data.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In PHP, you can utilize the openssl_decrypt function to decrypt encrypted data. The basic syntax of this function is as follows: string openssl_decrypt ( string $data , string $method , string $key [, int $options = 0 [, string $iv = &#8220;&#8221; [, string $tag = &#8220;&#8221; [, string $aad = &#8220;&#8221; [, int $tag_length [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[14,9005,9004,660,854],"class_list":["post-7092","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-cryptography","tag-data-decryption","tag-openssl_decrypt","tag-php","tag-php-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PHP openssl_decrypt: Secure Data Decryption - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn to use PHP&#039;s openssl_decrypt function for secure data decryption. 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