What Is OpenSSL Library ？
by İsmail Baydan
OpenSSL is most popular open source cryptography library which provides a lot of tools, libraries, algorithms about cryptography. It is mostly known with Secure Socket Layers (SSL) and Transport Layer Security (TLS) protocols.
OpenSSL是最流行的开源加密库，它提供了许多关于加密的工具、库和算法。它主要与安全套接字层（SSL）和传输层安全（TLS）协议有关。
支持的加密算法
Encryption is used to make given data unreadable by the intruders. It is mainly used for confidentiality. OpenSSL supports following algorithms.
加密用于使入侵者无法读取给定数据。主要用于保密。OpenSSL支持以下算法。
RAS
DSA
AES
DES
3DES
支持的hash算法
Hashing is used to create one way values which can not be converted back. This is useful for creating values identify given data. OpenSSL supports following hash algorithms.
哈希用于创建无法转换回的单向值。这对于创建标识给定数据的值很有用。OpenSSL支持以下哈希算法。
MD4
MD5
SHA1
SHA256
SHA512
RC4
DES
HMAC
支持的证书算法
Certificates used for authentic of the given data. OpenSSL supports following X.509 Certificate Algorithms
用于验证给定数据的证书。OpenSSL支持以下X.509证书算法
RSA
DSA
Elliptic Curves
支持的证书格式
Certificates hold some data and this data should be formatted in a standard manner. Certificate formats are used to specify this data structure.
证书包含一些数据，这些数据应以标准方式格式化。证书格式用于指定此数据结构。
PCKS10
X509
PKCS12