OPENSSL_ALGO_DSS1 
      (integer)
     OPENSSL_ALGO_SHA1 
      (integer)
     OPENSSL_ALGO_SHA224
      (integer)
     OPENSSL_ALGO_SHA256
      (integer)
     OPENSSL_ALGO_SHA384
      (integer)
     OPENSSL_ALGO_SHA512
      (integer)
     OPENSSL_ALGO_RMD160
      (integer)
     OPENSSL_ALGO_MD5 
      (integer)
     OPENSSL_ALGO_MD4 
      (integer)
     OPENSSL_ALGO_MD2 
      (integer)
     Note:
These constants were added in 5.0.0.
OPENSSL_ALGO_MD2,OPENSSL_ALGO_MD4,OPENSSL_ALGO_MD5,OPENSSL_ALGO_SHA1,OPENSSL_ALGO_DSS1
Note:
These constants were added in 5.4.8.
OPENSSL_ALGO_RMD160,OPENSSL_ALGO_SHA224,OPENSSL_ALGO_SHA256,OPENSSL_ALGO_SHA384,OPENSSL_ALGO_SHA512