Use new openssl builtin to replace constants

Author: tvdijen

src/Backend/OpenSSL.php

@@ -15,6 +15,7 @@
 use function chr;
 use function mb_strlen;
 use function openssl_cipher_iv_length;
+use function openssl_cipher_key_length;
 use function openssl_decrypt;
 use function openssl_encrypt;
 use function openssl_sign;
@@ -251,7 +252,7 @@ public function setCipher(string $cipher): void
             default:
                 $this->cipher = C::$BLOCK_CIPHER_ALGORITHMS[$cipher];
                 $this->blocksize = C::$BLOCK_SIZES[$cipher];
-                $this->keysize = C::$BLOCK_CIPHER_KEY_SIZES[$cipher];
+                $this->keysize = openssl_cipher_key_length(C::$BLOCK_CIPHER_ALGORITHMS[$cipher]);
         }
     }
 

src/Constants.php

@@ -117,17 +117,6 @@ class Constants extends \SimpleSAML\XML\Constants
         self::BLOCK_ENC_AES256_GCM => 16,
     ];
 
-    /** @var array<string, positive-int> */
-    public static array $BLOCK_CIPHER_KEY_SIZES = [
-        self::BLOCK_ENC_3DES => 24,
-        self::BLOCK_ENC_AES128 => 16,
-        self::BLOCK_ENC_AES192 => 24,
-        self::BLOCK_ENC_AES256 => 32,
-        self::BLOCK_ENC_AES128_GCM => 16,
-        self::BLOCK_ENC_AES192_GCM => 24,
-        self::BLOCK_ENC_AES256_GCM => 32,
-    ];
-
 
     /**
      * Key transport algorithms