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OPENSSL_ALGO_DSS1
(int)
OPENSSL_ALGO_SHA1
(int)
openssl_sign() 和 openssl_verify() 函数使用的默认算法。
OPENSSL_ALGO_SHA224
(int)
OPENSSL_ALGO_SHA256
(int)
OPENSSL_ALGO_SHA384
(int)
OPENSSL_ALGO_SHA512
(int)
OPENSSL_ALGO_RMD160
(int)
OPENSSL_ALGO_MD5
(int)
OPENSSL_ALGO_MD4
(int)
OPENSSL_ALGO_MD2
(int)
只有在使用 MD2 支持编译 PHP 时，才可以使用这个常量。当在编译 PHP 时需要验证通过
-DHAVE_OPENSSL_MD2_H CFLAGP，当编译 OpenSSL 1.0.0+
版本时需要启用 enable-md2 选项。
