Use require('crypto') to access this module.
使用require('crypto')调用加密模块。
The crypto module requires OpenSSL to be available on the underlying platform. It offers a way of encapsulating secure credentials to be used as part of a secure HTTPS net or http connection.
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。
It also offers a set of wrappers for OpenSSL's hash, hmac, cipher, decipher, sign and verify methods.
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。
Creates a credentials object, with the optional details being a dictionary with keys:
创建一个凭证对象，可选参数details为一个带键值的字典：
key : a string holding the PEM encoded private key
key：为字符串型，PEM编码的私钥。
cert : a string holding the PEM encoded certificate
cert：为字符串型，PEM编码的认证证书。
ca : either a string or list of strings of PEM encoded CA certificates to trust.
ca：字符串形式的PEM编码可信CA证书，或证书列表。
If no 'ca' details are given, then node.js will use the default publicly trusted list of CAs as given in http://mxr.mozilla.org/mozilla/source/security/nss/lib/ckfw/builtins/certdata.txt.
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。
Creates and returns a hash object, a cryptographic hash with the given algorithm which can be used to generate hash digests.
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。
algorithm is dependent on the available algorithms supported by the version
of OpenSSL on the platform. Examples are 'sha1', 'md5', 'sha256', 'sha512', etc.
On recent releases, openssl list-message-digest-algorithms will display the available digest algorithms.
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。
Updates the hash content with the given data.
This can be called many times with new data as it is streamed.
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。
Calculates the digest of all of the passed data to be hashed.
The encoding can be 'hex', 'binary' or 'base64'.
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'。
Creates and returns a hmac object, a cryptographic hmac with the given algorithm and 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。
algorithm is dependent on the available algorithms supported by OpenSSL - see createHash above.
key is the hmac key to be used.
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。
Update the hmac content with the given data.
This can be called many times with new data as it is streamed.
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。
Calculates the digest of all of the passed data to the hmac.
The encoding can be 'hex', 'binary' or 'base64'.
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'。
Creates and returns a cipher object, with the given algorithm and key.
使用指定的算法和密钥创建并返回一个cipher对象。
algorithm is dependent on OpenSSL, examples are 'aes192', etc.
On recent releases, openssl list-cipher-algorithms will display the available cipher algorithms.
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。
Updates the cipher with data, the encoding of which is given in input_encoding
and can be 'utf8', 'ascii' or 'binary'. The output_encoding specifies
the output format of the enciphered data, and can be 'binary', 'base64' or 'hex'.
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'。
Returns the enciphered contents, and can be called many times with new data as it is streamed.
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。
Returns any remaining enciphered contents, with output_encoding being one of: 'binary', 'ascii' or 'utf8'.
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。
Creates and returns a decipher object, with the given algorithm and key. This is the mirror of the cipher object above.
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。
Updates the decipher with data, which is encoded in 'binary', 'base64' or 'hex'.
The output_decoding specifies in what format to return the deciphered plaintext: 'binary', 'ascii' or 'utf8'.
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'。
Returns any remaining plaintext which is deciphered,
with output_encoding' being one of: 'binary', 'ascii' or 'utf8'`.
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。
Creates and returns a signing object, with the given algorithm.
On recent OpenSSL releases, openssl list-public-key-algorithms will display
the available signing algorithms. Examples are 'RSA-SHA256'.
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'。
Updates the signer object with data. This can be called many times with new data as it is streamed.
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。
Calculates the signature on all the updated data passed through the signer.
private_key is a string containing the PEM encoded private key for signing.
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。
Returns the signature in output_format which can be 'binary', 'hex' or 'base64'.
返回签名，其output_format输出可以为'binary', 'hex' 或者'base64'。
Creates and returns a verification object, with the given algorithm. This is the mirror of the signing object above.
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。
Updates the verifier object with data. This can be called many times with new data as it is streamed.
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。
Verifies the signed data by using the cert which is a string containing
the PEM encoded public key, and signature, which is the previously calculates
signature for the data, in the signature_format which can be 'binary', 'hex' or 'base64'.
使用参数cert和signature验证已签名的数据，cert为经过PEM编码的公钥字符串，signature为之前已计算的数据的签名，signature_format可以为'binary'，'hex' 或者'base64'。
Returns true or false depending on the validity of the signature for the data and public key.
根据对数据和公钥进行签名有效性验证的结果，返回true或者false。