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Merge PR #694: Proto_IkePacket.c: fix MD5, SHA-256, SHA-384 and SHA-512 implementation

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Davide Beatrici 2018-09-11 16:08:17 +02:00 committed by GitHub
commit 64b68c15f4
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1 changed files with 24 additions and 88 deletions
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106
src/Cedar/Proto_IkePacket.c
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@ -2963,108 +2963,44 @@ void IkeHash(IKE_HASH *h, void *dst, void *src, UINT size)
// Calculation of HMAC
void IkeHMac(IKE_HASH *h, void *dst, void *key, UINT key_size, void *data, UINT data_size)
{
UINT hmac_block_size = HMAC_BLOCK_SIZE;
UCHAR k[HMAC_BLOCK_SIZE_MAX];
UCHAR *data1;
UCHAR hash1[IKE_MAX_HASH_SIZE];
UINT data1_size;
UCHAR data2[IKE_MAX_HASH_SIZE + HMAC_BLOCK_SIZE_MAX];
UINT data2_size;
UCHAR tmp1600[1600];
bool no_free = false;
UINT i;
MD *md = NULL;
// Validate arguments
if (h == NULL || dst == NULL || (key == NULL && key_size != 0) || (data == NULL && data_size != 0))
{
return;
}
switch (h->HashId)
switch(h->HashId)
{
case IKE_HASH_MD5_ID:
md = NewMd("MD5");
break;
case IKE_HASH_SHA1_ID:
md = NewMd("SHA1");
break;
case IKE_HASH_SHA2_256_ID:
hmac_block_size = HMAC_BLOCK_SIZE;
md = NewMd("SHA256");
break;
case IKE_HASH_SHA2_384_ID:
case IKE_HASH_SHA2_512_ID:
hmac_block_size = HMAC_BLOCK_SIZE_1024;
md = NewMd("SHA384");
break;
case IKE_HASH_SHA2_512_ID:
md = NewMd("SHA512");
break;
}
default:
if (md == NULL)
{
Debug("IkeHMac(): The MD object is NULL! Either NewMd() failed or the current algorithm is not handled by the switch-case block.");
return;
}
if (hmac_block_size > HMAC_BLOCK_SIZE_MAX)
{
return;
}
if (h->HashId == IKE_HASH_SHA1_ID)
{
// Use special function (fast) in the case of SHA-1
HMacSha1(dst, key, key_size, data, data_size);
return;
}
else if (h->HashId == IKE_HASH_MD5_ID)
{
// Use the special function (fast) in the case of MD5
HMacMd5(dst, key, key_size, data, data_size);
return;
}
// Creating a K
Zero(k, sizeof(k));
if (key_size <= hmac_block_size)
{
Copy(k, key, key_size);
}
else
{
IkeHash(h, k, key, key_size);
}
// Generation of data 1
data1_size = data_size + hmac_block_size;
if (data1_size > sizeof(tmp1600))
{
data1 = Malloc(data1_size);
}
else
{
data1 = tmp1600;
no_free = true;
}
for (i = 0;i < hmac_block_size;i++)
{
data1[i] = k[i] ^ 0x36;
}
Copy(data1 + hmac_block_size, data, data_size);
// Calculate the hash value
IkeHash(h, hash1, data1, data1_size);
if (no_free == false)
{
Free(data1);
}
// Generation of data 2
data2_size = h->HashSize + hmac_block_size;
for (i = 0;i < hmac_block_size;i++)
{
data2[i] = k[i] ^ 0x5c;
}
Copy(data2 + hmac_block_size, hash1, h->HashSize);
// Calculate the hash value
IkeHash(h, dst, data2, data2_size);
SetMdKey(md, key, key_size);
MdProcess(md, dst, data, data_size);
FreeMd(md);
}
void IkeHMacBuf(IKE_HASH *h, void *dst, BUF *key, BUF *data)
{
// Validate arguments