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Disable random access for XChaCha20

pull/794/head
Jeffrey Walton 2019-02-05 13:41:36 -05:00
parent 0178e06d0d
commit cc1c5fae0f
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1 changed files with 3 additions and 6 deletions
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chacha.cpp
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@ -546,12 +546,9 @@ void XChaCha20_Policy::CipherResynchronize(byte *keystreamBuffer, const byte *iv
void XChaCha20_Policy::SeekToIteration(lword iterationCount) void XChaCha20_Policy::SeekToIteration(lword iterationCount)
{ {
// Should we throw here??? If the initial block counter is // Should we throw here??? XChaCha does not have a block
// large then we can wrap and process more data as long as // counter, so I'm not sure how to seek on it.
// data processed in the security context does not exceed CRYPTOPP_ASSERT(0);
// 2^32 blocks or approximately 256 GB of data.
CRYPTOPP_ASSERT(iterationCount <= std::numeric_limits<word32>::max());
m_state[12] = (word32)iterationCount; // low word
} }
unsigned int XChaCha20_Policy::GetAlignment() const unsigned int XChaCha20_Policy::GetAlignment() const