


Introduction to common methods of NODE.JS encryption module CRYPTO_node.js
使用require('crypto')调用加密模块。
加密模块需要底层系统提供OpenSSL的支持。它提供了一种安全凭证的封装方式,可以用于HTTPS安全网络以及普通HTTP连接。
该模块还提供了一套针对OpenSSL的hash(哈希),hmac(密钥哈希),cipher(编码),decipher(解码),sign(签名)以及verify(验证)等方法的封装。
crypto.createCredentials(details)
创建一个凭证对象,可选参数details为一个带键值的字典:
key:为字符串型,PEM编码的私钥。
cert:为字符串型,PEM编码的认证证书。
ca:字符串形式的PEM编码可信CA证书,或证书列表。
如果没有给出'ca'的详细内容,那么node.js将会使用默认的公开受信任列表,该表位于http://mxr.mozilla.org/mozilla/source/security/nss/lib/ckfw/builtins/certdata.txt。
crypto.createHash(algorithm)
创建并返回一个hash对象,它是一个指定算法的加密hash,用于生成hash摘要。
参数algorithm可选择系统上安装的OpenSSL版本所支持的算法。例如:'sha1', 'md5', 'sha256', 'sha512'等。在近期发行的版本中,openssl list-message-digest-algorithms会显示这些可用的摘要算法。
hash.update(data)
更新hash的内容为指定的data。当使用流数据时可能会多次调用该方法。
hash.digest(encoding='binary')
计算所有传入数据的hash摘要。参数encoding(编码方式)可以为'hex', 'binary' 或者'base64'。
crypto.createHmac(algorithm, key)
创建并返回一个hmac对象,它是一个指定算法和密钥的加密hmac。
参数algorithm可选择OpenSSL支持的算法 - 参见上文的createHash。参数key为hmac所使用的密钥。
hmac.update(data)
更新hmac的内容为指定的data。当使用流数据时可能会多次调用该方法。
hmac.digest(encoding='binary')
计算所有传入数据的hmac摘要。参数encoding(编码方式)可以为'hex', 'binary' 或者'base64'。
crypto.createCipher(algorithm, key)
使用指定的算法和密钥创建并返回一个cipher对象。
参数algorithm可选择OpenSSL支持的算法,例如'aes192'等。在最近的发行版中,openssl list-cipher-algorithms会显示可用的加密的算法。
cipher.update(data, input_encoding='binary', output_encoding='binary')
使用参数data更新要加密的内容,其编码方式由参数input_encoding指定,可以为 'utf8', 'ascii'或者'binary'。参数output_encoding指定了已加密内容的输出编码方式,可以为 'binary', 'base64'或'hex'。
返回已加密的内容,当使用流数据时可能会多次调用该方法。
cipher.final(output_encoding='binary')
返回所有剩余的加密内容,output_encoding输出编码为'binary', 'ascii'或'utf8'其中之一。
crypto.createDecipher(algorithm, key)
使用给定的算法和密钥创建并返回一个解密对象。该对象为上述加密对象的反向运算。
decipher.update(data, input_encoding='binary', output_encoding='binary')
使用参数data更新要解密的内容,其编码方式为'binary','base64'或'hex'。参数output_encoding指定了已解密的明文内容的输出编码方式,可以为 'binary','ascii'或'utf8'。
decipher.final(output_encoding='binary')
返回全部剩余的已解密的明文,其output_encoding' 为'binary', 'ascii'或'utf8'`其中之一。
crypto.createSign(algorithm)
使用给定的算法创建并返回一个签名器对象。在现有的OpenSSL发行版中,openssl list-public-key-algorithms会显示可用的签名算法,例如:'RSA-SHA256'。
signer.update(data)
使用data参数更新签名器对象。当使用流数据时可能会多次调用该方法。
signer.sign(private_key, output_format='binary')
对所有传入签名器的数据计算其签名。private_key为字符串,它包含了PEM编码的用于签名的私钥。
返回签名,其output_format输出可以为'binary', 'hex' 或者'base64'。
crypto.createVerify(algorithm)
使用给定算法创建并返回一个验证器对象。它是上述签名器对象的反向运算。
verifier.update(data)
使用data参数更新验证器对象。当使用流数据时可能会多次调用该方法。
verifier.verify(cert, signature, signature_format='binary')
Use the parameters cert and signature to verify the signed data. cert is the PEM-encoded public key string, signature is the signature of the previously calculated data, and signature_format can be 'binary', 'hex' or 'base64'.
Return true or false based on the result of signature validity verification of data and public key.
How to write an irreversible encryption code when you need it
var text = "123|12312312123123121231231212312312123123121231231212312312";
var hasher=crypto.createHash("md5");
hasher.update(text);
var hashmsg=hasher.di gest('hex'); //hashmsg is the encrypted data
When you need an encryption and decryption environment
var key="asdhjwheru*asd123-123";/ /Encrypted key
var text = "123|12312312123123121231231212312312123123121231231212312312";
var crypted =cipher.update(text,'utf8','hexcip');
crypted = her.final(' hex' );
var message=crypted;//Encrypted value
var decipher = crypto.createDecipher('aes-256-cbc',key);
var dec=decipher.update(message,' hex','utf8');
dec = decipher.final('utf8');//The value after decryption

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