LibCrypto: Convert StringBuilder::appendf() => AK::Format

Userland/Libraries/LibCrypto/Cipher/AES.cpp

@@ -26,8 +26,8 @@ constexpr void swap_keys(u32* keys, size_t i, size_t j)
 String AESCipherBlock::to_string() const
 {
     StringBuilder builder;
-    for (size_t i = 0; i < BlockSizeInBits / 8; ++i)
-        builder.appendf("%02x", m_data[i]);
+    for (auto value : m_data)
+        builder.appendff("{:02x}", value);
     return builder.build();
 }
 
@@ -35,7 +35,7 @@ String AESCipherKey::to_string() const
 {
     StringBuilder builder;
     for (size_t i = 0; i < (rounds() + 1) * 4; ++i)
-        builder.appendf("%02x", m_rd_keys[i]);
+        builder.appendff("{:02x}", m_rd_keys[i]);
     return builder.build();
 }
 

Userland/Libraries/LibCrypto/Hash/SHA2.h

@@ -100,11 +100,9 @@ public:
 
     virtual String class_name() const override
     {
-        StringBuilder builder;
-        builder.append("SHA");
-        builder.appendf("%zu", this->DigestSize * 8);
-        return builder.build();
-    };
+        return String::formatted("SHA{}", DigestSize * 8);
+    }
+
     inline virtual void reset() override
     {
         m_data_length = 0;
@@ -152,11 +150,9 @@ public:
 
     virtual String class_name() const override
     {
-        StringBuilder builder;
-        builder.append("SHA");
-        builder.appendf("%zu", this->DigestSize * 8);
-        return builder.build();
-    };
+        return String::formatted("SHA{%zu}", DigestSize * 8);
+    }
+
     inline virtual void reset() override
     {
         m_data_length = 0;