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Zero-padding API function for Poly1305

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This commit is contained in:
Rhys Weatherley 2015-03-31 13:16:55 +10:00
parent a8e7932130
commit 68f27bf912
2 changed files with 18 additions and 1 deletions
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17
libraries/Crypto/Poly1305.cpp
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@ -138,7 +138,7 @@ void Poly1305::reset(const void *key)
* If finalize() has already been called, then the behavior of update() will * If finalize() has already been called, then the behavior of update() will
* be undefined. Call reset() first to start a new authentication process. * be undefined. Call reset() first to start a new authentication process.
* *
* \sa reset(), finalize() * \sa pad(), reset(), finalize()
*/ */
void Poly1305::update(const void *data, size_t len) void Poly1305::update(const void *data, size_t len)
{ {
@ -243,6 +243,21 @@ void Poly1305::finalize(const void *nonce, void *token, size_t len)
memcpy(token, state.h, len); memcpy(token, state.h, len);
} }
/**
* \brief Pads the input stream with zero bytes to a multiple of 16.
*
* \sa update()
*/
void Poly1305::pad()
{
if (state.chunkSize != 0) {
memset(((uint8_t *)state.c) + state.chunkSize, 0, 16 - state.chunkSize);
state.c[NUM_LIMBS_128BIT] = 1;
processChunk();
state.chunkSize = 0;
}
}
/** /**
* \brief Clears the authenticator's state, removing all sensitive data. * \brief Clears the authenticator's state, removing all sensitive data.
*/ */

2
libraries/Crypto/Poly1305.h
View File

@ -36,6 +36,8 @@ public:
void update(const void *data, size_t len); void update(const void *data, size_t len);
void finalize(const void *nonce, void *token, size_t len); void finalize(const void *nonce, void *token, size_t len);
void pad();
void clear(); void clear();
private: private: