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HMAC fix

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Adam Ierymenko 2019-09-04 15:22:15 -07:00
parent e8f8b0f8e5
commit 82b7e1dbcb
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GPG key ID: C8877CF2D7A5D7F3
3 changed files with 65 additions and 36 deletions
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19
node/AES.hpp
View file

@ -16,6 +16,7 @@
#include "Constants.hpp"
#include "Utils.hpp"
#include "SHA512.hpp"
#if (defined(__amd64) || defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || defined(__AMD64) || defined(__AMD64__) || defined(_M_X64))
#include <wmmintrin.h>
@ -246,6 +247,24 @@ public:
#endif
}
/**
* Use HMAC-SHA-384 as a PRF to generate four AES keys from one master
*
* @param masterKey Master 256-bit key
* @param k1 GMAC key
* @param k2 GMAC auth tag masking (ECB encryption) key
* @param k3 CTR IV masking (ECB encryption) key
* @param k4 AES-CTR key
*/
static inline void initGmacCtrKeys(const uint8_t masterKey[32],AES &k1,AES &k2,AES &k3,AES &k4)
{
uint64_t kbuf[6];
for(uint8_t kno=0;kno<4;++kno) {
HMACSHA384(masterKey,&kno,1,(uint8_t *)kbuf);
k1.init((const uint8_t *)kbuf);
}
}
private:
static const uint32_t Te0[256];
static const uint32_t Te1[256];

41
node/SHA512.cpp
View file

@ -10,10 +10,10 @@
#include <utility>
#include <algorithm>
#ifndef ZT_HAVE_NATIVE_SHA512
namespace ZeroTier {
#ifndef ZT_HAVE_NATIVE_SHA512
namespace {
struct sha512_state {
@ -239,6 +239,39 @@ void SHA384(void *digest,const void *data0,unsigned int len0,const void *data1,u
memcpy(digest,tmp,48);
}
} // namespace ZeroTier
#endif // !ZT_HAVE_NATIVE_SHA512
void HMACSHA384(const uint8_t key[32],const void *msg,const unsigned int msglen,uint8_t mac[48])
{
uint64_t kInPadded[16]; // input padded key
uint64_t outer[22]; // output padded key | H(input padded key | msg)
#ifdef ZT_NO_TYPE_PUNNING
for(int i=0;i<32;++i) ((uint8_t *)kInPadded)[i] = key[i] ^ 0x36;
for(int i=4;i<16;++i) kInPadded[i] = 0x3636363636363636ULL;
for(int i=0;i<32;++i) ((uint8_t *)outer)[i] = key[i] ^ 0x5c;
for(int i=4;i<16;++i) outer[i] = 0x5c5c5c5c5c5c5c5cULL;
#else
{
const uint64_t k0 = ((const uint64_t *)key)[0];
const uint64_t k1 = ((const uint64_t *)key)[1];
const uint64_t k2 = ((const uint64_t *)key)[2];
const uint64_t k3 = ((const uint64_t *)key)[3];
kInPadded[0] = k0 ^ 0x3636363636363636ULL;
kInPadded[1] = k1 ^ 0x3636363636363636ULL;
kInPadded[2] = k2 ^ 0x3636363636363636ULL;
kInPadded[3] = k3 ^ 0x3636363636363636ULL;
for(int i=4;i<16;++i) kInPadded[i] = 0x3636363636363636ULL;
outer[0] = k0 ^ 0x5c5c5c5c5c5c5c5cULL;
outer[1] = k1 ^ 0x5c5c5c5c5c5c5c5cULL;
outer[2] = k2 ^ 0x5c5c5c5c5c5c5c5cULL;
outer[3] = k3 ^ 0x5c5c5c5c5c5c5c5cULL;
for(int i=4;i<16;++i) outer[i] = 0x5c5c5c5c5c5c5c5cULL;
}
#endif
SHA384(((uint8_t *)outer) + 128,kInPadded,128,msg,msglen); // H(input padded key | msg)
SHA384(mac,outer,176); // H(output padded key | H(input padded key | msg))
}
} // namespace ZeroTier

41
node/SHA512.hpp
View file

@ -92,38 +92,15 @@ void SHA384(void *digest,const void *data,unsigned int len);
void SHA384(void *digest,const void *data0,unsigned int len0,const void *data1,unsigned int len1);
#endif
static inline void HMACSHA384(const uint8_t key[32],const void *msg,const unsigned int msglen,uint8_t mac[48])
{
uint64_t kInPadded[16];
uint64_t outer[22]; // output padded key | H(input padded key | msg)
#ifdef ZT_NO_TYPE_PUNNING
for(int i=0;i<32;++i) ((uint8_t *)kInPadded)[i] = key[i] ^ 0x36;
for(int i=4;i<16;++i) kInPadded[i] = 0x3636363636363636ULL;
for(int i=0;i<32;++i) ((uint8_t *)outer)[i] = key[i] ^ 0x5c;
for(int i=4;i<16;++i) outer[i] = 0x5c5c5c5c5c5c5c5cULL;
#else
{
const uint64_t k0 = ((const uint64_t *)key)[0];
const uint64_t k1 = ((const uint64_t *)key)[1];
const uint64_t k2 = ((const uint64_t *)key)[2];
const uint64_t k3 = ((const uint64_t *)key)[3];
kInPadded[0] = k0 ^ 0x3636363636363636ULL;
kInPadded[0] = k1 ^ 0x3636363636363636ULL;
kInPadded[0] = k2 ^ 0x3636363636363636ULL;
kInPadded[0] = k3 ^ 0x3636363636363636ULL;
for(int i=4;i<16;++i) kInPadded[i] = 0x3636363636363636ULL;
outer[0] = k0 ^ 0x5c5c5c5c5c5c5c5cULL;
outer[1] = k1 ^ 0x5c5c5c5c5c5c5c5cULL;
outer[2] = k2 ^ 0x5c5c5c5c5c5c5c5cULL;
outer[3] = k3 ^ 0x5c5c5c5c5c5c5c5cULL;
for(int i=4;i<16;++i) outer[i] = 0x5c5c5c5c5c5c5c5cULL;
}
#endif
SHA384(((uint8_t *)outer) + 128,kInPadded,128,msg,msglen); // H(input padded key | msg)
SHA384(mac,outer,176); // H(output padded key | H(input padded key | msg))
}
/**
* Compute HMAC SHA-384 using a 256-bit key
*
* @param key Secret key
* @param msg Message to HMAC
* @param msglen Length of message
* @param mac Buffer to fill with result
*/
void HMACSHA384(const uint8_t key[32],const void *msg,const unsigned int msglen,uint8_t mac[48]);
} // namespace ZeroTier