/** @file | |
Diffie-Hellman Wrapper Implementation over OpenSSL. | |
Copyright (c) 2010 - 2016, Intel Corporation. All rights reserved.<BR> | |
This program and the accompanying materials | |
are licensed and made available under the terms and conditions of the BSD License | |
which accompanies this distribution. The full text of the license may be found at | |
http://opensource.org/licenses/bsd-license.php | |
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
**/ | |
#include "InternalCryptLib.h" | |
#include <openssl/bn.h> | |
#include <openssl/dh.h> | |
/** | |
Allocates and Initializes one Diffie-Hellman Context for subsequent use. | |
@return Pointer to the Diffie-Hellman Context that has been initialized. | |
If the allocations fails, DhNew() returns NULL. | |
**/ | |
VOID * | |
EFIAPI | |
DhNew ( | |
VOID | |
) | |
{ | |
// | |
// Allocates & Initializes DH Context by OpenSSL DH_new() | |
// | |
return (VOID *) DH_new (); | |
} | |
/** | |
Release the specified DH context. | |
If DhContext is NULL, then return FALSE. | |
@param[in] DhContext Pointer to the DH context to be released. | |
**/ | |
VOID | |
EFIAPI | |
DhFree ( | |
IN VOID *DhContext | |
) | |
{ | |
// | |
// Free OpenSSL DH Context | |
// | |
DH_free ((DH *) DhContext); | |
} | |
/** | |
Generates DH parameter. | |
Given generator g, and length of prime number p in bits, this function generates p, | |
and sets DH context according to value of g and p. | |
Before this function can be invoked, pseudorandom number generator must be correctly | |
initialized by RandomSeed(). | |
If DhContext is NULL, then return FALSE. | |
If Prime is NULL, then return FALSE. | |
@param[in, out] DhContext Pointer to the DH context. | |
@param[in] Generator Value of generator. | |
@param[in] PrimeLength Length in bits of prime to be generated. | |
@param[out] Prime Pointer to the buffer to receive the generated prime number. | |
@retval TRUE DH pamameter generation succeeded. | |
@retval FALSE Value of Generator is not supported. | |
@retval FALSE PRNG fails to generate random prime number with PrimeLength. | |
**/ | |
BOOLEAN | |
EFIAPI | |
DhGenerateParameter ( | |
IN OUT VOID *DhContext, | |
IN UINTN Generator, | |
IN UINTN PrimeLength, | |
OUT UINT8 *Prime | |
) | |
{ | |
BOOLEAN RetVal; | |
// | |
// Check input parameters. | |
// | |
if (DhContext == NULL || Prime == NULL || PrimeLength > INT_MAX) { | |
return FALSE; | |
} | |
if (Generator != DH_GENERATOR_2 && Generator != DH_GENERATOR_5) { | |
return FALSE; | |
} | |
RetVal = (BOOLEAN) DH_generate_parameters_ex (DhContext, (UINT32) PrimeLength, (UINT32) Generator, NULL); | |
if (!RetVal) { | |
return FALSE; | |
} | |
BN_bn2bin (((DH *) DhContext)->p, Prime); | |
return TRUE; | |
} | |
/** | |
Sets generator and prime parameters for DH. | |
Given generator g, and prime number p, this function and sets DH | |
context accordingly. | |
If DhContext is NULL, then return FALSE. | |
If Prime is NULL, then return FALSE. | |
@param[in, out] DhContext Pointer to the DH context. | |
@param[in] Generator Value of generator. | |
@param[in] PrimeLength Length in bits of prime to be generated. | |
@param[in] Prime Pointer to the prime number. | |
@retval TRUE DH pamameter setting succeeded. | |
@retval FALSE Value of Generator is not supported. | |
@retval FALSE Value of Generator is not suitable for the Prime. | |
@retval FALSE Value of Prime is not a prime number. | |
@retval FALSE Value of Prime is not a safe prime number. | |
**/ | |
BOOLEAN | |
EFIAPI | |
DhSetParameter ( | |
IN OUT VOID *DhContext, | |
IN UINTN Generator, | |
IN UINTN PrimeLength, | |
IN CONST UINT8 *Prime | |
) | |
{ | |
DH *Dh; | |
BIGNUM *Bn; | |
// | |
// Check input parameters. | |
// | |
if (DhContext == NULL || Prime == NULL || PrimeLength > INT_MAX) { | |
return FALSE; | |
} | |
if (Generator != DH_GENERATOR_2 && Generator != DH_GENERATOR_5) { | |
return FALSE; | |
} | |
Bn = NULL; | |
Dh = (DH *) DhContext; | |
Dh->g = NULL; | |
Dh->p = BN_new (); | |
if (Dh->p == NULL) { | |
goto Error; | |
} | |
Dh->g = BN_new (); | |
if (Dh->g == NULL) { | |
goto Error; | |
} | |
Bn = BN_bin2bn (Prime, (UINT32) (PrimeLength / 8), Dh->p); | |
if (Bn == NULL) { | |
goto Error; | |
} | |
if (BN_set_word (Dh->g, (UINT32) Generator) == 0) { | |
goto Error; | |
} | |
return TRUE; | |
Error: | |
if (Dh->p != NULL) { | |
BN_free (Dh->p); | |
} | |
if (Dh->g != NULL) { | |
BN_free (Dh->g); | |
} | |
if (Bn != NULL) { | |
BN_free (Bn); | |
} | |
return FALSE; | |
} | |
/** | |
Generates DH public key. | |
This function generates random secret exponent, and computes the public key, which is | |
returned via parameter PublicKey and PublicKeySize. DH context is updated accordingly. | |
If the PublicKey buffer is too small to hold the public key, FALSE is returned and | |
PublicKeySize is set to the required buffer size to obtain the public key. | |
If DhContext is NULL, then return FALSE. | |
If PublicKeySize is NULL, then return FALSE. | |
If PublicKeySize is large enough but PublicKey is NULL, then return FALSE. | |
@param[in, out] DhContext Pointer to the DH context. | |
@param[out] PublicKey Pointer to the buffer to receive generated public key. | |
@param[in, out] PublicKeySize On input, the size of PublicKey buffer in bytes. | |
On output, the size of data returned in PublicKey buffer in bytes. | |
@retval TRUE DH public key generation succeeded. | |
@retval FALSE DH public key generation failed. | |
@retval FALSE PublicKeySize is not large enough. | |
**/ | |
BOOLEAN | |
EFIAPI | |
DhGenerateKey ( | |
IN OUT VOID *DhContext, | |
OUT UINT8 *PublicKey, | |
IN OUT UINTN *PublicKeySize | |
) | |
{ | |
BOOLEAN RetVal; | |
DH *Dh; | |
INTN Size; | |
// | |
// Check input parameters. | |
// | |
if (DhContext == NULL || PublicKeySize == NULL) { | |
return FALSE; | |
} | |
if (PublicKey == NULL && *PublicKeySize != 0) { | |
return FALSE; | |
} | |
Dh = (DH *) DhContext; | |
RetVal = (BOOLEAN) DH_generate_key (DhContext); | |
if (RetVal) { | |
Size = BN_num_bytes (Dh->pub_key); | |
if (Size <= 0) { | |
*PublicKeySize = 0; | |
return FALSE; | |
} | |
if (*PublicKeySize < (UINTN) Size) { | |
*PublicKeySize = Size; | |
return FALSE; | |
} | |
BN_bn2bin (Dh->pub_key, PublicKey); | |
*PublicKeySize = Size; | |
} | |
return RetVal; | |
} | |
/** | |
Computes exchanged common key. | |
Given peer's public key, this function computes the exchanged common key, based on its own | |
context including value of prime modulus and random secret exponent. | |
If DhContext is NULL, then return FALSE. | |
If PeerPublicKey is NULL, then return FALSE. | |
If KeySize is NULL, then return FALSE. | |
If Key is NULL, then return FALSE. | |
If KeySize is not large enough, then return FALSE. | |
@param[in, out] DhContext Pointer to the DH context. | |
@param[in] PeerPublicKey Pointer to the peer's public key. | |
@param[in] PeerPublicKeySize Size of peer's public key in bytes. | |
@param[out] Key Pointer to the buffer to receive generated key. | |
@param[in, out] KeySize On input, the size of Key buffer in bytes. | |
On output, the size of data returned in Key buffer in bytes. | |
@retval TRUE DH exchanged key generation succeeded. | |
@retval FALSE DH exchanged key generation failed. | |
@retval FALSE KeySize is not large enough. | |
**/ | |
BOOLEAN | |
EFIAPI | |
DhComputeKey ( | |
IN OUT VOID *DhContext, | |
IN CONST UINT8 *PeerPublicKey, | |
IN UINTN PeerPublicKeySize, | |
OUT UINT8 *Key, | |
IN OUT UINTN *KeySize | |
) | |
{ | |
BIGNUM *Bn; | |
INTN Size; | |
// | |
// Check input parameters. | |
// | |
if (DhContext == NULL || PeerPublicKey == NULL || KeySize == NULL || Key == NULL) { | |
return FALSE; | |
} | |
if (PeerPublicKeySize > INT_MAX) { | |
return FALSE; | |
} | |
Bn = BN_bin2bn (PeerPublicKey, (UINT32) PeerPublicKeySize, NULL); | |
if (Bn == NULL) { | |
return FALSE; | |
} | |
Size = DH_compute_key (Key, Bn, DhContext); | |
if (Size < 0) { | |
BN_free (Bn); | |
return FALSE; | |
} | |
if (*KeySize < (UINTN) Size) { | |
*KeySize = Size; | |
BN_free (Bn); | |
return FALSE; | |
} | |
*KeySize = Size; | |
BN_free (Bn); | |
return TRUE; | |
} |