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Updated documentation. Whitespace

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This commit is contained in:
Jeffrey Walton 2016-11-27 20:09:55 -05:00
parent 7b36f81dc5
commit 6c9deef853
No known key found for this signature in database
GPG Key ID: B36AB348921B1838
2 changed files with 25 additions and 7 deletions
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29
poly1305.cpp
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@ -91,11 +91,21 @@ void Poly1305_Base<T>::Update(const byte *input, size_t length)
template <class T>
void Poly1305_Base<T>::ProcessBlocks(const byte *input, size_t length, word32 padbit)
{
word32 r0 = m_r[0], r1 = m_r[1], r2 = m_r[2], r3 = m_r[3];
word32 h0 = m_h[0], h1 = m_h[1], h2 = m_h[2], h3 = m_h[3], h4 = m_h[4];
word32 c, s1 = r1 + (r1 >> 2), s2 = r2 + (r2 >> 2), s3 = r3 + (r3 >> 2);
word32 r0, r1, r2, r3;
word32 s1, s2, s3;
word32 h0, h1, h2, h3, h4, c;
word64 d0, d1, d2, d3;
r0 = m_r[0]; r1 = m_r[1];
r2 = m_r[2]; r3 = m_r[3];
s1 = r1 + (r1 >> 2);
s2 = r2 + (r2 >> 2);
s3 = r3 + (r3 >> 2);
h0 = m_h[0]; h1 = m_h[1]; h2 = m_h[2];
h3 = m_h[3]; h4 = m_h[4];
while (length >= BLOCKSIZE)
{
// h += m[i]
@ -141,7 +151,7 @@ void Poly1305_Base<T>::ProcessBlocks(const byte *input, size_t length, word32 pa
h1 += (c = CONSTANT_TIME_CARRY(h0,c));
h2 += (c = CONSTANT_TIME_CARRY(h1,c));
h3 += (c = CONSTANT_TIME_CARRY(h2,c));
h4 += CONSTANT_TIME_CARRY(h3,c);
h4 += CONSTANT_TIME_CARRY(h3,c);
input += BLOCKSIZE;
length -= BLOCKSIZE;
@ -177,10 +187,17 @@ void Poly1305_Base<T>::TruncatedFinal(byte *mac, size_t size)
template <class T>
void Poly1305_Base<T>::ProcessFinal(byte *mac, size_t size)
{
word32 h0 = m_h[0], h1 = m_h[1], h2 = m_h[2], h3 = m_h[3], h4 = m_h[4];
word32 g0, g1, g2, g3, g4, mask;
word32 h0, h1, h2, h3, h4;
word32 g0, g1, g2, g3, g4;
word32 mask;
word64 t;
h0 = m_h[0];
h1 = m_h[1];
h2 = m_h[2];
h3 = m_h[3];
h4 = m_h[4];
// compare to modulus by computing h + -p
g0 = (word32)(t = (word64)h0 + 5);
g1 = (word32)(t = (word64)h1 + (t >> 32));

3
poly1305.h
View File

@ -159,7 +159,8 @@ public:
//! \param nonceLength the size of the byte array, in bytes
//! \details key is the 32-byte key composed of the 16-byte AES key and the 16 additional key
//! bytes used for <tt>r</tt>.
//! \details Each message requires a unique security context.
//! \details Each message requires a unique security context. You can use GetNextIV() and
//! Resynchronize() to set a new nonce under a key for a message.
Poly1305(const byte *key, size_t keyLength=DEFAULT_KEYLENGTH, const byte *nonce=NULL, size_t nonceLength=0)
{this->SetKey(key, keyLength, MakeParameters(Name::IV(), ConstByteArrayParameter(nonce, nonceLength)));}
};