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Do not expose l_tree function

It's not used outside xmss_commons
master
Joost Rijneveld hace 7 años
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758a6349fc
No se encontró ninguna clave conocida en la base de datos para esta firma ID de clave GPG: A4FE39CF49CBC553
Se han modificado 2 ficheros con 44 adiciones y 51 borrados
  1. +44
    -43
      xmss_commons.c
  2. +0
    -8
      xmss_commons.h

+ 44
- 43
xmss_commons.c Ver fichero

@@ -9,52 +9,13 @@
#include "utils.h"
#include "xmss_commons.h"

/**
* Computes the leaf at a given address. First generates the WOTS key pair,
* then computes leaf using l_tree. As this happens position independent, we
* only require that addr encodes the right ltree-address.
*/
void gen_leaf_wots(const xmss_params *params, unsigned char *leaf,
const unsigned char *sk_seed, const unsigned char *pub_seed,
uint32_t ltree_addr[8], uint32_t ots_addr[8])
{
unsigned char seed[params->n];
unsigned char pk[params->wots_sig_bytes];

get_seed(params, seed, sk_seed, ots_addr);
wots_pkgen(params, pk, seed, pub_seed, ots_addr);

l_tree(params, leaf, pk, pub_seed, ltree_addr);
}

/**
* Used for pseudo-random key generation.
* Generates the seed for the WOTS key pair at address 'addr'.
*
* Takes n-byte sk_seed and returns n-byte seed using 32 byte address 'addr'.
*/
void get_seed(const xmss_params *params, unsigned char *seed,
const unsigned char *sk_seed, uint32_t addr[8])
{
unsigned char bytes[32];

/* Make sure that chain addr, hash addr, and key bit are zeroed. */
set_chain_addr(addr, 0);
set_hash_addr(addr, 0);
set_key_and_mask(addr, 0);

/* Generate seed. */
addr_to_bytes(bytes, addr);
prf(params, seed, bytes, sk_seed);
}

/**
* Computes a leaf node from a WOTS public key using an L-tree.
* Note that this destroys the used WOTS public key.
*/
void l_tree(const xmss_params *params,
unsigned char *leaf, unsigned char *wots_pk,
const unsigned char *pub_seed, uint32_t addr[8])
static void l_tree(const xmss_params *params,
unsigned char *leaf, unsigned char *wots_pk,
const unsigned char *pub_seed, uint32_t addr[8])
{
unsigned int l = params->wots_len;
unsigned int parent_nodes;
@@ -127,13 +88,53 @@ static void compute_root(const xmss_params *params, unsigned char *root,
auth_path += params->n;
}

/* The last iteration is exceptional; we do not copy an auth)path node. */
/* The last iteration is exceptional; we do not copy an auth_path node. */
set_tree_height(addr, params->tree_height - 1);
leafidx >>= 1;
set_tree_index(addr, leafidx);
thash_h(params, root, buffer, pub_seed, addr);
}


/**
* Computes the leaf at a given address. First generates the WOTS key pair,
* then computes leaf using l_tree. As this happens position independent, we
* only require that addr encodes the right ltree-address.
*/
void gen_leaf_wots(const xmss_params *params, unsigned char *leaf,
const unsigned char *sk_seed, const unsigned char *pub_seed,
uint32_t ltree_addr[8], uint32_t ots_addr[8])
{
unsigned char seed[params->n];
unsigned char pk[params->wots_sig_bytes];

get_seed(params, seed, sk_seed, ots_addr);
wots_pkgen(params, pk, seed, pub_seed, ots_addr);

l_tree(params, leaf, pk, pub_seed, ltree_addr);
}

/**
* Used for pseudo-random key generation.
* Generates the seed for the WOTS key pair at address 'addr'.
*
* Takes n-byte sk_seed and returns n-byte seed using 32 byte address 'addr'.
*/
void get_seed(const xmss_params *params, unsigned char *seed,
const unsigned char *sk_seed, uint32_t addr[8])
{
unsigned char bytes[32];

/* Make sure that chain addr, hash addr, and key bit are zeroed. */
set_chain_addr(addr, 0);
set_hash_addr(addr, 0);
set_key_and_mask(addr, 0);

/* Generate seed. */
addr_to_bytes(bytes, addr);
prf(params, seed, bytes, sk_seed);
}

/**
* Verifies a given message signature pair under a given public key.
* Note that this assumes a pk without an OID, i.e. [root || PUB_SEED]


+ 0
- 8
xmss_commons.h Ver fichero

@@ -22,14 +22,6 @@ void gen_leaf_wots(const xmss_params *params, unsigned char *leaf,
void get_seed(const xmss_params *params, unsigned char *seed,
const unsigned char *sk_seed, uint32_t addr[8]);

/**
* Computes a leaf node from a WOTS public key using an L-tree.
* Note that the WOTS public key is destroyed.
*/
void l_tree(const xmss_params *params,
unsigned char *leaf, unsigned char *wots_pk,
const unsigned char *pub_seed, uint32_t addr[8]);

/**
* Verifies a given message signature pair under a given public key.
* Note that this assumes a pk without an OID, i.e. [root || PUB_SEED]


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