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openssl对base64编解码的规范支持较差，用它编解码的结果别的语言如php处理很不方便，注意的几点整理如下
1，如果php加密结果做base64编码长度小于64，则需要添加一个换行符openssl才能解码；
2，php需要对base64编码结果每隔64个字符插入一个换行符，openssl才能解码。（原因是openssl默认bufsize缓冲区大小16k，但是一旦涉及base64的计算缓冲区只有80字节，一旦编码结果超过80字节则会计算失败，base64编解码无法更改缓冲区大小）
示例代码如下：
一，php加密openssl解密
<?php function strtohex($x) { $s=‘‘; foreach (str_split($x) as $c) $s.=sprintf("%02X",ord($c)); return($s); } $source = file_get_contents("phpencrypt.plain"); $iv = "1234567812345678"; $pass = ‘a12ssdamqweret09‘; $method = ‘aes-128-cbc‘; $content = base64_encode(openssl_encrypt($source, $method, $pass, true, $iv)); $newcontent = ""; for($i = 0, $len = strlen($content); $i < $len; $i += 64){ $newcontent = $newcontent . substr($content, $i, 64); if($i + 64 < $len){ $newcontent .= "\n"; } if($len < 64){ $newcontent .= "\n"; } } file_put_contents (‘./phpencrypt.encrypted‘,$newcontent); $exec = "openssl enc -".$method." -d -a -bufsize 1 -in phpencrypt.encrypted -out phpencrypt.plain2 -nosalt -nopad -K ".strtohex($pass)." -iv ".strtohex($iv); echo $exec."\n"; exec($exec); $source = file_get_contents("phpencrypt.plain2"); echo trim($source); ?>
二，openssl加密php解密
<?php function strtohex($x) { $s=‘‘; foreach (str_split($x) as $c) $s.=sprintf("%02X",ord($c)); return($s); } $iv = "1234567812345678"; $pass = ‘a12ssdamqweret09‘; $method = ‘aes-128-cbc‘; echo "openssl enc -aes-128-cbc -a -in phpdecrypt.plain -out phpdecrypt.encrypted -K ".strtohex($pass)." -iv ".strtohex($iv)."\n"; echo exec("openssl enc -aes-128-cbc -a -in phpdecrypt.plain -out phpdecrypt.encrypted -K ".strtohex($pass)." -iv ".strtohex($iv)); $content = file_get_contents(‘./phpdecrypt.encrypted‘); $data = openssl_decrypt(base64_decode($content), $method, $pass, true, $iv); echo trim($data); ?>
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原文地址：http://www.cnblogs.com/ciaos/p/4719556.html
