签名算法
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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。
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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。
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用户贡献的备注 1 note
tim at remitone dot com ¶
1 year ago
It should be noted that the default signature algorithm used by openssl_sign() and openssl_verify (OPENSSL_ALGO_SHA1) is no longer supported by default in OpenSSL Version 3 series.
With an up to date OpenSSL library, one has to run
"update-crypto-policies --set LEGACY"
on the server where the library resides in order to allow these functions to work without the optional alternative algorithm argument.备份地址：http://www.lvesu.com/blog/php/openssl.signature-algos.php