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Avoid Coverity finding SIZEOF_MISMATCH/suspicious_sizeof (Issue 210)

pull/211/head
Jeffrey Walton 2016-07-01 13:52:10 -04:00
parent 4c6833e706
commit 20c3e1a5ef
1 changed files with 29 additions and 23 deletions
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48
blake2.cpp
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@ -199,12 +199,14 @@ BLAKE2_ParameterBlock<false>::BLAKE2_ParameterBlock(size_t digestLen, size_t key
const byte* saltStr, size_t saltLen, const byte* saltStr, size_t saltLen,
const byte* personalizationStr, size_t personalizationLen) const byte* personalizationStr, size_t personalizationLen)
{ {
static const size_t head = sizeof(BLAKE2_ParameterBlock<false>) - sizeof(personalization) - sizeof(salt); // Avoid Coverity finding SIZEOF_MISMATCH/suspicious_sizeof
memset(this, 0x00, head);
digestLength = (byte)digestLen; digestLength = (byte)digestLen;
keyLength = (byte)keyLen; keyLength = (byte)keyLen;
fanout = depth = 1; fanout = depth = 1;
nodeDepth = innerLength = 0;
memset(leafLength, 0x00, COUNTOF(leafLength));
memset(nodeOffset, 0x00, COUNTOF(nodeOffset));
if (saltStr && saltLen) if (saltStr && saltLen)
{ {
@ -212,7 +214,7 @@ BLAKE2_ParameterBlock<false>::BLAKE2_ParameterBlock(size_t digestLen, size_t key
const size_t rem = COUNTOF(salt) - saltLen; const size_t rem = COUNTOF(salt) - saltLen;
const size_t off = COUNTOF(salt) - rem; const size_t off = COUNTOF(salt) - rem;
if (rem) if (rem)
memset(&salt[off], 0x00, rem); memset(salt+off, 0x00, rem);
} }
else else
{ {
@ -225,7 +227,7 @@ BLAKE2_ParameterBlock<false>::BLAKE2_ParameterBlock(size_t digestLen, size_t key
const size_t rem = COUNTOF(personalization) - personalizationLen; const size_t rem = COUNTOF(personalization) - personalizationLen;
const size_t off = COUNTOF(personalization) - rem; const size_t off = COUNTOF(personalization) - rem;
if (rem) if (rem)
memset(&personalization[off], 0x00, rem); memset(personalization+off, 0x00, rem);
} }
else else
{ {
@ -237,12 +239,15 @@ BLAKE2_ParameterBlock<true>::BLAKE2_ParameterBlock(size_t digestLen, size_t keyL
const byte* saltStr, size_t saltLen, const byte* saltStr, size_t saltLen,
const byte* personalizationStr, size_t personalizationLen) const byte* personalizationStr, size_t personalizationLen)
{ {
static const size_t head = sizeof(BLAKE2_ParameterBlock<true>) - sizeof(personalization) - sizeof(salt); // Avoid Coverity finding SIZEOF_MISMATCH/suspicious_sizeof
memset(this, 0x00, head);
digestLength = (byte)digestLen; digestLength = (byte)digestLen;
keyLength = (byte)keyLen; keyLength = (byte)keyLen;
fanout = depth = 1; fanout = depth = 1;
nodeDepth = innerLength = 0;
memset(rfu, 0x00, COUNTOF(rfu));
memset(leafLength, 0x00, COUNTOF(leafLength));
memset(nodeOffset, 0x00, COUNTOF(nodeOffset));
if (saltStr && saltLen) if (saltStr && saltLen)
{ {
@ -250,7 +255,7 @@ BLAKE2_ParameterBlock<true>::BLAKE2_ParameterBlock(size_t digestLen, size_t keyL
const size_t rem = COUNTOF(salt) - saltLen; const size_t rem = COUNTOF(salt) - saltLen;
const size_t off = COUNTOF(salt) - rem; const size_t off = COUNTOF(salt) - rem;
if (rem) if (rem)
memset(&salt[off], 0x00, rem); memset(salt+off, 0x00, rem);
} }
else else
{ {
@ -263,7 +268,7 @@ BLAKE2_ParameterBlock<true>::BLAKE2_ParameterBlock(size_t digestLen, size_t keyL
const size_t rem = COUNTOF(personalization) - personalizationLen; const size_t rem = COUNTOF(personalization) - personalizationLen;
const size_t off = COUNTOF(personalization) - rem; const size_t off = COUNTOF(personalization) - rem;
if (rem) if (rem)
memset(&personalization[off], 0x00, rem); memset(personalization+off, 0x00, rem);
} }
else else
{ {
@ -290,40 +295,41 @@ void BLAKE2_Base<W, T_64bit>::UncheckedSetKey(const byte *key, unsigned int leng
m_key.resize(0); m_key.resize(0);
} }
// Zero everything except the two trailing strings #if defined(__COVERITY__)
// Avoid Coverity finding SIZEOF_MISMATCH/suspicious_sizeof
ParameterBlock& block = *m_block.data(); ParameterBlock& block = *m_block.data();
const size_t head = sizeof(ParameterBlock) - COUNTOF(block.personalization) - COUNTOF(block.salt); memset(m_block.data(), 0x00, sizeof(ParameterBlock));
memset(m_block.data(), 0x00, head); #else
// Set Head bytes; Tail bytes are set below
ParameterBlock& block = *m_block.data();
memset(m_block.data(), 0x00, T_64bit ? 32 : 16);
#endif
block.keyLength = (byte)length; block.keyLength = (byte)length;
block.digestLength = (byte)params.GetIntValueWithDefault(Name::DigestSize(), DIGESTSIZE); block.digestLength = (byte)params.GetIntValueWithDefault(Name::DigestSize(), DIGESTSIZE);
block.fanout = block.depth = 1; block.fanout = block.depth = 1;
ConstByteArrayParameter t; ConstByteArrayParameter t;
if (params.GetValue(Name::Salt(), t)) if (params.GetValue(Name::Salt(), t) && t.begin() && t.size())
{ {
if (t.begin() && t.size())
memcpy_s(block.salt, COUNTOF(block.salt), t.begin(), t.size()); memcpy_s(block.salt, COUNTOF(block.salt), t.begin(), t.size());
const size_t rem = COUNTOF(block.salt) - t.size(); const size_t rem = COUNTOF(block.salt) - t.size();
const size_t off = COUNTOF(block.salt) - rem; const size_t off = COUNTOF(block.salt) - rem;
if (rem) if (rem)
memset(&block.salt[off], 0x00, rem); memset(block.salt+off, 0x00, rem);
} }
else else
{ {
memset(block.salt, 0x00, COUNTOF(block.salt)); memset(block.salt, 0x00, COUNTOF(block.salt));
} }
if (params.GetValue(Name::Personalization(), t)) if (params.GetValue(Name::Personalization(), t) && t.begin() && t.size())
{ {
if (t.begin() && t.size())
memcpy_s(block.personalization, COUNTOF(block.personalization), t.begin(), t.size()); memcpy_s(block.personalization, COUNTOF(block.personalization), t.begin(), t.size());
const size_t rem = COUNTOF(block.personalization) - t.size(); const size_t rem = COUNTOF(block.personalization) - t.size();
const size_t off = COUNTOF(block.personalization) - rem; const size_t off = COUNTOF(block.personalization) - rem;
if (rem) if (rem)
memset(&block.personalization[off], 0x00, rem); memset(block.personalization+off, 0x00, rem);
} }
else else
{ {