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275 lines
7.3 KiB
C
275 lines
7.3 KiB
C
/** @file
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Diffie-Hellman Wrapper Implementation over OpenSSL.
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Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "InternalCryptLib.h"
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#include <openssl/dh.h>
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/**
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Allocates and Initializes one Diffie-Hellman Context for subsequent use.
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@return Pointer to the Diffie-Hellman Context that has been initialized.
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If the allocations fails, DhNew() returns NULL.
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**/
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VOID *
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EFIAPI
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DhNew (
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VOID
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)
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{
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//
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// Allocates & Initializes DH Context by OpenSSL DH_new()
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//
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return (VOID *)DH_new ();
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}
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/**
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Release the specified DH context.
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If DhContext is NULL, then return FALSE.
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@param[in] DhContext Pointer to the DH context to be released.
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**/
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VOID
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EFIAPI
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DhFree (
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IN VOID *DhContext
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)
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{
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//
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// Free OpenSSL DH Context
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//
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DH_free ((DH *)DhContext);
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}
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/**
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Generates DH parameter.
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Given generator g, and length of prime number p in bits, this function generates p,
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and sets DH context according to value of g and p.
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Before this function can be invoked, pseudorandom number generator must be correctly
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initialized by RandomSeed().
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If DhContext is NULL, then return FALSE.
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If Prime is NULL, then return FALSE.
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@param[in, out] DhContext Pointer to the DH context.
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@param[in] Generator Value of generator.
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@param[in] PrimeLength Length in bits of prime to be generated.
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@param[out] Prime Pointer to the buffer to receive the generated prime number.
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@retval TRUE DH pamameter generation succeeded.
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@retval FALSE Value of Generator is not supported.
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@retval FALSE PRNG fails to generate random prime number with PrimeLength.
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**/
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BOOLEAN
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EFIAPI
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DhGenerateParameter (
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IN OUT VOID *DhContext,
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IN UINTN Generator,
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IN UINTN PrimeLength,
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OUT UINT8 *Prime
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)
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{
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BOOLEAN RetVal;
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//
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// Check input parameters.
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//
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if (DhContext == NULL || Prime == NULL) {
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return FALSE;
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}
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if (Generator != DH_GENERATOR_2 && Generator != DH_GENERATOR_5) {
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return FALSE;
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}
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RetVal = (BOOLEAN) DH_generate_parameters_ex (DhContext, (UINT32) PrimeLength, (UINT32) Generator, NULL);
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if (!RetVal) {
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return FALSE;
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}
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BN_bn2bin (((DH *) DhContext)->p, Prime);
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return TRUE;
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}
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/**
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Sets generator and prime parameters for DH.
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Given generator g, and prime number p, this function and sets DH
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context accordingly.
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If DhContext is NULL, then return FALSE.
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If Prime is NULL, then return FALSE.
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@param[in, out] DhContext Pointer to the DH context.
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@param[in] Generator Value of generator.
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@param[in] PrimeLength Length in bits of prime to be generated.
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@param[in] Prime Pointer to the prime number.
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@retval TRUE DH pamameter setting succeeded.
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@retval FALSE Value of Generator is not supported.
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@retval FALSE Value of Generator is not suitable for the Prime.
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@retval FALSE Value of Prime is not a prime number.
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@retval FALSE Value of Prime is not a safe prime number.
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**/
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BOOLEAN
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EFIAPI
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DhSetParameter (
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IN OUT VOID *DhContext,
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IN UINTN Generator,
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IN UINTN PrimeLength,
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IN CONST UINT8 *Prime
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)
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{
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DH *Dh;
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//
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// Check input parameters.
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//
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if (DhContext == NULL || Prime == NULL) {
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return FALSE;
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}
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if (Generator != DH_GENERATOR_2 && Generator != DH_GENERATOR_5) {
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return FALSE;
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}
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Dh = (DH *) DhContext;
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Dh->p = BN_new();
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Dh->g = BN_new();
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BN_bin2bn (Prime, (UINT32) (PrimeLength / 8), Dh->p);
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BN_set_word (Dh->g, (UINT32) Generator);
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return TRUE;
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}
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/**
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Generates DH public key.
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This function generates random secret exponent, and computes the public key, which is
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returned via parameter PublicKey and PublicKeySize. DH context is updated accordingly.
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If the PublicKey buffer is too small to hold the public key, FALSE is returned and
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PublicKeySize is set to the required buffer size to obtain the public key.
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If DhContext is NULL, then return FALSE.
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If PublicKeySize is NULL, then return FALSE.
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If PublicKeySize is large enough but PublicKey is NULL, then return FALSE.
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@param[in, out] DhContext Pointer to the DH context.
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@param[out] PublicKey Pointer to the buffer to receive generated public key.
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@param[in, out] PublicKeySize On input, the size of PublicKey buffer in bytes.
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On output, the size of data returned in PublicKey buffer in bytes.
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@retval TRUE DH public key generation succeeded.
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@retval FALSE DH public key generation failed.
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@retval FALSE PublicKeySize is not large enough.
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**/
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BOOLEAN
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EFIAPI
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DhGenerateKey (
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IN OUT VOID *DhContext,
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OUT UINT8 *PublicKey,
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IN OUT UINTN *PublicKeySize
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)
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{
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BOOLEAN RetVal;
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DH *Dh;
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//
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// Check input parameters.
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//
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if (DhContext == NULL || PublicKeySize == NULL) {
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return FALSE;
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}
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if (PublicKey == NULL && *PublicKeySize != 0) {
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return FALSE;
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}
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Dh = (DH *) DhContext;
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*PublicKeySize = 0;
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RetVal = (BOOLEAN) DH_generate_key (DhContext);
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if (RetVal) {
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BN_bn2bin (Dh->pub_key, PublicKey);
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*PublicKeySize = BN_num_bytes (Dh->pub_key);
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}
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return RetVal;
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}
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/**
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Computes exchanged common key.
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Given peer's public key, this function computes the exchanged common key, based on its own
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context including value of prime modulus and random secret exponent.
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If DhContext is NULL, then return FALSE.
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If PeerPublicKey is NULL, then return FALSE.
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If KeySize is NULL, then return FALSE.
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If KeySize is large enough but Key is NULL, then return FALSE.
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@param[in, out] DhContext Pointer to the DH context.
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@param[in] PeerPublicKey Pointer to the peer's public key.
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@param[in] PeerPublicKeySize Size of peer's public key in bytes.
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@param[out] Key Pointer to the buffer to receive generated key.
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@param[in, out] KeySize On input, the size of Key buffer in bytes.
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On output, the size of data returned in Key buffer in bytes.
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@retval TRUE DH exchanged key generation succeeded.
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@retval FALSE DH exchanged key generation failed.
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@retval FALSE KeySize is not large enough.
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**/
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BOOLEAN
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EFIAPI
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DhComputeKey (
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IN OUT VOID *DhContext,
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IN CONST UINT8 *PeerPublicKey,
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IN UINTN PeerPublicKeySize,
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OUT UINT8 *Key,
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IN OUT UINTN *KeySize
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)
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{
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BIGNUM *Bn;
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//
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// Check input parameters.
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//
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if (DhContext == NULL || PeerPublicKey == NULL || KeySize == NULL) {
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return FALSE;
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}
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if (Key == NULL && *KeySize != 0) {
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return FALSE;
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}
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Bn = BN_bin2bn (PeerPublicKey, (UINT32) PeerPublicKeySize, NULL);
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*KeySize = (BOOLEAN) DH_compute_key (Key, Bn, DhContext);
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BN_free (Bn);
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return TRUE;
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}
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