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Kernel: Convert random bytes interface to use AK::Bytes

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This commit is contained in:
Brian Gianforcaro 2021-08-31 23:28:47 -07:00 • committed by Andreas Kling
parent 0678ac265c
commit f3baa5d8c9
5 changed files with 20 additions and 19 deletions
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17
Kernel/Random.h
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@ -35,7 +35,7 @@ public:
{
}
bool get_random_bytes(u8* buffer, size_t n)
bool get_random_bytes(Bytes buffer)
{
SpinlockLocker lock(m_lock);
if (!is_ready())
@ -47,13 +47,12 @@ public:
VERIFY(is_seeded());
// FIXME: More than 2^20 bytes cannot be generated without refreshing the key.
VERIFY(n < (1 << 20));
VERIFY(buffer.size() < (1 << 20));
typename CipherType::CTRMode cipher(m_key, KeySize, Crypto::Cipher::Intent::Encryption);
Bytes buffer_span { buffer, n };
auto counter_span = m_counter.bytes();
cipher.key_stream(buffer_span, counter_span, &counter_span);
cipher.key_stream(buffer, counter_span, &counter_span);
// Extract a new key from the prng stream.
Bytes key_span = m_key.bytes();
@ -173,14 +172,15 @@ private:
// NOTE: These API's are primarily about expressing intent/needs in the calling code.
// The only difference is that get_fast_random is guaranteed not to block.
void get_fast_random_bytes(u8*, size_t);
bool get_good_random_bytes(u8*, size_t, bool allow_wait = true, bool fallback_to_fast = true);
void get_fast_random_bytes(Bytes);
bool get_good_random_bytes(Bytes bytes, bool allow_wait = true, bool fallback_to_fast = true);
template<typename T>
inline T get_fast_random()
{
T value;
get_fast_random_bytes(reinterpret_cast<u8*>(&value), sizeof(T));
Bytes bytes { reinterpret_cast<u8*>(&value), sizeof(T) };
get_fast_random_bytes(bytes);
return value;
}
@ -188,7 +188,8 @@ template<typename T>
inline T get_good_random()
{
T value;
get_good_random_bytes(reinterpret_cast<u8*>(&value), sizeof(T));
Bytes bytes { reinterpret_cast<u8*>(&value), sizeof(T) };
get_good_random_bytes(bytes);
return value;
}