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- private value doesn't have to be prime!

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This commit is contained in:
Jan Hutter
2005-12-07 15:36:55 +00:00
parent 5346c89460
commit 0d43ad12dd
1 changed files with 20 additions and 7 deletions
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Source/charon/transforms/diffie_hellman.c
+20 -7
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@@ -381,9 +381,9 @@ struct private_diffie_hellman_t {
u_int16_t generator; u_int16_t generator;
/** /**
* My prime . * My private value .
*/ */
mpz_t my_prime; mpz_t my_private_value;
/** /**
* My public value. * My public value.
@@ -486,7 +486,7 @@ static void compute_shared_secret (private_diffie_hellman_t *this)
/* initialize my public value */ /* initialize my public value */
mpz_init(this->shared_secret); mpz_init(this->shared_secret);
/* calculate my public value */ /* calculate my public value */
mpz_powm(this->shared_secret,this->other_public_value,this->my_prime,this->modulus); mpz_powm(this->shared_secret,this->other_public_value,this->my_private_value,this->modulus);
this->shared_secret_is_computed = TRUE; this->shared_secret_is_computed = TRUE;
} }
@@ -502,7 +502,7 @@ static void compute_public_value (private_diffie_hellman_t *this)
/* initialize my public value */ /* initialize my public value */
mpz_init(this->my_public_value); mpz_init(this->my_public_value);
/* calculate my public value */ /* calculate my public value */
mpz_powm(this->my_public_value,generator,this->my_prime,this->modulus); mpz_powm(this->my_public_value,generator,this->my_private_value,this->modulus);
/* generator not used anymore */ /* generator not used anymore */
mpz_clear(generator); mpz_clear(generator);
} }
@@ -536,7 +536,7 @@ static status_t get_shared_secret(private_diffie_hellman_t *this,chunk_t *secret
static void destroy(private_diffie_hellman_t *this) static void destroy(private_diffie_hellman_t *this)
{ {
mpz_clear(this->modulus); mpz_clear(this->modulus);
mpz_clear(this->my_prime); mpz_clear(this->my_private_value);
mpz_clear(this->my_public_value); mpz_clear(this->my_public_value);
mpz_clear(this->other_public_value); mpz_clear(this->other_public_value);
@@ -554,6 +554,8 @@ static void destroy(private_diffie_hellman_t *this)
diffie_hellman_t *diffie_hellman_create(diffie_hellman_group_t dh_group_number) diffie_hellman_t *diffie_hellman_create(diffie_hellman_group_t dh_group_number)
{ {
private_diffie_hellman_t *this = allocator_alloc_thing(private_diffie_hellman_t); private_diffie_hellman_t *this = allocator_alloc_thing(private_diffie_hellman_t);
randomizer_t *randomizer;
chunk_t random_bytes;
/* public functions */ /* public functions */
this->public.get_shared_secret = (status_t (*)(diffie_hellman_t *, chunk_t *)) get_shared_secret; this->public.get_shared_secret = (status_t (*)(diffie_hellman_t *, chunk_t *)) get_shared_secret;
@@ -571,15 +573,26 @@ diffie_hellman_t *diffie_hellman_create(diffie_hellman_group_t dh_group_number)
this->dh_group_number = dh_group_number; this->dh_group_number = dh_group_number;
mpz_init(this->modulus); mpz_init(this->modulus);
mpz_init(this->other_public_value); mpz_init(this->other_public_value);
mpz_init(this->my_private_value);
/* set this->modulus */ /* set this->modulus */
if (this->set_modulus(this) != SUCCESS) if (this->set_modulus(this) != SUCCESS)
{ {
allocator_free(this); allocator_free(this);
return NULL; return NULL;
} }
randomizer = randomizer_create();
if (randomizer == NULL)
{
allocator_free(this);
return NULL;
}
randomizer->allocate_pseudo_random_bytes(randomizer, this->modulus_length, &random_bytes);
charon->prime_pool->get_prime(charon->prime_pool, this->modulus_length, &(this->my_prime)); mpz_import(this->my_private_value, random_bytes.len, 1, 1, 1, 0, random_bytes.ptr);
allocator_free_chunk(&random_bytes);
randomizer->destroy(randomizer);
this->compute_public_value(this); this->compute_public_value(this);