## Signature Algorithms

`OPENSSL_ALGO_DSS1` (int)
`OPENSSL_ALGO_SHA1` (int)
  Used as default algorithm by openssl_sign() and openssl_verify().
`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)
  This constant is only available if PHP is compiled with MD2 support. This requires passing in the `-DHAVE_OPENSSL_MD2_H` CFLAG when compiling PHP, and `enable-md2` when compiling OpenSSL 1.0.0+.

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