AuroraMiddleware/mbedtls
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Shorted LMS and LMOTS line-lengths

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To attempt to comply with the 80-char suggestion

Signed-off-by: Raef Coles <raef.coles@arm.com>
This commit is contained in:
Raef Coles 2022-09-01 17:23:12 +01:00
parent e9479a0264
commit 366d67d9af
No known key found for this signature in database
GPG Key ID: 1AAF1B43DF2086F4
4 changed files with 92 additions and 60 deletions
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3
include/mbedtls/lms.h
View File

@ -68,7 +68,8 @@
extern "C" {
#endif
/* https://www.iana.org/assignments/leighton-micali-signatures/leighton-micali-signatures.xhtml
/** The Identifier of the LMS parameter set, as per
* https://www.iana.org/assignments/leighton-micali-signatures/leighton-micali-signatures.xhtml
* We are only implementing a subset of the types, particularly H10, for the sake of simplicty.
*/
typedef enum {

66
library/lmots.c
View File

@ -44,13 +44,18 @@
#include "psa/crypto.h"
#define MBEDTLS_LMOTS_SIG_C_RANDOM_OFFSET (MBEDTLS_LMOTS_SIG_TYPE_OFFSET + MBEDTLS_LMOTS_TYPE_LEN)
#define MBEDTLS_LMOTS_SIG_SIGNATURE_OFFSET(type) (MBEDTLS_LMOTS_SIG_C_RANDOM_OFFSET + MBEDTLS_LMOTS_C_RANDOM_VALUE_LEN(type))
#define MBEDTLS_LMOTS_SIG_C_RANDOM_OFFSET (MBEDTLS_LMOTS_SIG_TYPE_OFFSET + \
MBEDTLS_LMOTS_TYPE_LEN)
#define MBEDTLS_LMOTS_SIG_SIGNATURE_OFFSET(type) (MBEDTLS_LMOTS_SIG_C_RANDOM_OFFSET + \
MBEDTLS_LMOTS_C_RANDOM_VALUE_LEN(type))
#define MBEDTLS_LMOTS_PUBLIC_KEY_TYPE_OFFSET (0)
#define MBEDTLS_LMOTS_PUBLIC_KEY_I_KEY_ID_OFFSET (MBEDTLS_LMOTS_PUBLIC_KEY_TYPE_OFFSET + MBEDTLS_LMOTS_TYPE_LEN)
#define MBEDTLS_LMOTS_PUBLIC_KEY_Q_LEAF_ID_OFFSET (MBEDTLS_LMOTS_PUBLIC_KEY_I_KEY_ID_OFFSET + MBEDTLS_LMOTS_I_KEY_ID_LEN)
#define MBEDTLS_LMOTS_PUBLIC_KEY_KEY_HASH_OFFSET (MBEDTLS_LMOTS_PUBLIC_KEY_Q_LEAF_ID_OFFSET + MBEDTLS_LMOTS_Q_LEAF_ID_LEN)
#define MBEDTLS_LMOTS_PUBLIC_KEY_TYPE_OFFSET (0)
#define MBEDTLS_LMOTS_PUBLIC_KEY_I_KEY_ID_OFFSET (MBEDTLS_LMOTS_PUBLIC_KEY_TYPE_OFFSET + \
MBEDTLS_LMOTS_TYPE_LEN)
#define MBEDTLS_LMOTS_PUBLIC_KEY_Q_LEAF_ID_OFFSET (MBEDTLS_LMOTS_PUBLIC_KEY_I_KEY_ID_OFFSET + \
MBEDTLS_LMOTS_I_KEY_ID_LEN)
#define MBEDTLS_LMOTS_PUBLIC_KEY_KEY_HASH_OFFSET (MBEDTLS_LMOTS_PUBLIC_KEY_Q_LEAF_ID_OFFSET + \
MBEDTLS_LMOTS_Q_LEAF_ID_LEN)
/* We only support parameter sets that use 8-bit digits, as it does not require
* translation logic between digits and bytes */
@ -69,7 +74,8 @@
static const unsigned char D_PUBLIC_CONSTANT_BYTES[D_CONST_LEN] = {0x80, 0x80};
static const unsigned char D_MESSAGE_CONSTANT_BYTES[D_CONST_LEN] = {0x81, 0x81};
void unsigned_int_to_network_bytes(unsigned int val, size_t len, unsigned char *bytes)
void unsigned_int_to_network_bytes(unsigned int val, size_t len,
unsigned char *bytes)
{
size_t idx;
@ -78,7 +84,8 @@ void unsigned_int_to_network_bytes(unsigned int val, size_t len, unsigned char *
}
}
unsigned int network_bytes_to_unsigned_int(size_t len, const unsigned char *bytes)
unsigned int network_bytes_to_unsigned_int(size_t len,
const unsigned char *bytes)
{
size_t idx;
unsigned int val = 0;
@ -195,13 +202,18 @@ static int hash_digit_array( const mbedtls_lmots_parameters_t *params,
i_digit_idx++ )
{
memcpy( tmp_hash, &x_digit_array[i_digit_idx * MBEDTLS_LMOTS_N_HASH_LEN(params->type)],
memcpy( tmp_hash,
&x_digit_array[i_digit_idx * MBEDTLS_LMOTS_N_HASH_LEN(params->type)],
MBEDTLS_LMOTS_N_HASH_LEN(params->type) );
j_hash_idx_min = hash_idx_min_values != NULL ? hash_idx_min_values[i_digit_idx] : 0;
j_hash_idx_max = hash_idx_max_values != NULL ? hash_idx_max_values[i_digit_idx] : DIGIT_MAX_VALUE;
j_hash_idx_min = hash_idx_min_values != NULL ?
hash_idx_min_values[i_digit_idx] : 0;
j_hash_idx_max = hash_idx_max_values != NULL ?
hash_idx_max_values[i_digit_idx] : DIGIT_MAX_VALUE;
for ( j_hash_idx = (unsigned char)j_hash_idx_min; j_hash_idx < j_hash_idx_max; j_hash_idx++ )
for ( j_hash_idx = (unsigned char)j_hash_idx_min;
j_hash_idx < j_hash_idx_max;
j_hash_idx++ )
{
status = psa_hash_setup( &op, PSA_ALG_SHA_256 );
ret = mbedtls_lms_error_from_psa( status );
@ -222,13 +234,15 @@ static int hash_digit_array( const mbedtls_lmots_parameters_t *params,
if ( ret != 0 )
goto exit;
unsigned_int_to_network_bytes( i_digit_idx, I_DIGIT_IDX_LEN, i_digit_idx_bytes );
unsigned_int_to_network_bytes( i_digit_idx, I_DIGIT_IDX_LEN,
i_digit_idx_bytes );
status = psa_hash_update( &op, i_digit_idx_bytes, I_DIGIT_IDX_LEN );
ret = mbedtls_lms_error_from_psa( status );
if ( ret != 0 )
goto exit;
unsigned_int_to_network_bytes( j_hash_idx, J_HASH_IDX_LEN, j_hash_idx_bytes );
unsigned_int_to_network_bytes( j_hash_idx, J_HASH_IDX_LEN,
j_hash_idx_bytes );
status = psa_hash_update( &op, j_hash_idx_bytes, J_HASH_IDX_LEN );
ret = mbedtls_lms_error_from_psa( status );
if ( ret != 0 )
@ -240,7 +254,8 @@ static int hash_digit_array( const mbedtls_lmots_parameters_t *params,
if ( ret != 0 )
goto exit;
status = psa_hash_finish( &op, tmp_hash, sizeof( tmp_hash ), &output_hash_len );
status = psa_hash_finish( &op, tmp_hash, sizeof( tmp_hash ),
&output_hash_len );
ret = mbedtls_lms_error_from_psa( status );
if ( ret != 0 )
goto exit;
@ -248,8 +263,8 @@ static int hash_digit_array( const mbedtls_lmots_parameters_t *params,
psa_hash_abort( &op );
}
memcpy( &output[i_digit_idx * MBEDTLS_LMOTS_N_HASH_LEN(params->type)], tmp_hash,
MBEDTLS_LMOTS_N_HASH_LEN(params->type) );
memcpy( &output[i_digit_idx * MBEDTLS_LMOTS_N_HASH_LEN(params->type)],
tmp_hash, MBEDTLS_LMOTS_N_HASH_LEN(params->type) );
}
exit:
@ -304,7 +319,8 @@ static int public_key_from_hashed_digit_array( const mbedtls_lmots_parameters_t
if ( ret != 0 )
goto exit;
status = psa_hash_finish( &op, pub_key, MBEDTLS_LMOTS_N_HASH_LEN(params->type),
status = psa_hash_finish( &op, pub_key,
MBEDTLS_LMOTS_N_HASH_LEN(params->type),
&output_hash_len );
ret = mbedtls_lms_error_from_psa( status );
@ -354,10 +370,12 @@ int mbedtls_lmots_import_public_key( mbedtls_lmots_public_t *ctx,
}
memcpy( ctx->params.I_key_identifier,
key + MBEDTLS_LMOTS_PUBLIC_KEY_I_KEY_ID_OFFSET, MBEDTLS_LMOTS_I_KEY_ID_LEN );
key + MBEDTLS_LMOTS_PUBLIC_KEY_I_KEY_ID_OFFSET,
MBEDTLS_LMOTS_I_KEY_ID_LEN );
memcpy( ctx->params.q_leaf_identifier,
key + MBEDTLS_LMOTS_PUBLIC_KEY_Q_LEAF_ID_OFFSET, MBEDTLS_LMOTS_Q_LEAF_ID_LEN );
key + MBEDTLS_LMOTS_PUBLIC_KEY_Q_LEAF_ID_OFFSET,
MBEDTLS_LMOTS_Q_LEAF_ID_LEN );
memcpy( ctx->public_key,
key + MBEDTLS_LMOTS_PUBLIC_KEY_KEY_HASH_OFFSET,
@ -448,7 +466,7 @@ int mbedtls_lmots_verify( mbedtls_lmots_public_t *ctx, const unsigned char *msg,
}
if ( network_bytes_to_unsigned_int( MBEDTLS_LMOTS_TYPE_LEN,
sig + MBEDTLS_LMOTS_SIG_TYPE_OFFSET ) != MBEDTLS_LMOTS_SHA256_N32_W8 )
sig + MBEDTLS_LMOTS_SIG_TYPE_OFFSET ) != MBEDTLS_LMOTS_SHA256_N32_W8 )
{
return( MBEDTLS_ERR_LMS_VERIFY_FAILED );
}
@ -545,7 +563,8 @@ int mbedtls_lmots_generate_private_key( mbedtls_lmots_private_t *ctx,
if ( ret )
goto exit;
unsigned_int_to_network_bytes( i_digit_idx, I_DIGIT_IDX_LEN, i_digit_idx_bytes );
unsigned_int_to_network_bytes( i_digit_idx, I_DIGIT_IDX_LEN,
i_digit_idx_bytes );
status = psa_hash_update( &op, i_digit_idx_bytes, I_DIGIT_IDX_LEN );
ret = mbedtls_lms_error_from_psa( status );
if ( ret )
@ -691,7 +710,8 @@ int mbedtls_lmots_sign( mbedtls_lmots_private_t *ctx,
return( MBEDTLS_ERR_LMS_BAD_INPUT_DATA );
}
ret = f_rng( p_rng, tmp_c_random, MBEDTLS_LMOTS_N_HASH_LEN(ctx->params.type) );
ret = f_rng( p_rng, tmp_c_random,
MBEDTLS_LMOTS_N_HASH_LEN(ctx->params.type) );
if ( ret )
{
return( ret );

21
library/lmots.h
View File

@ -59,8 +59,9 @@
extern "C" {
#endif
/* https://www.iana.org/assignments/leighton-micali-signatures/leighton-micali-signatures.xhtml
* We are only implementing a subset of the types, particularly n32_w8, for the sake of simplicty.
/** The Identifier of the LMS parameter set, as per
* https://www.iana.org/assignments/leighton-micali-signatures/leighton-micali-signatures.xhtml.
* We are only implementing a subset of the types, particularly N32_W8, for the sake of simplicty.
*/
typedef enum {
MBEDTLS_LMOTS_SHA256_N32_W8 = 4
@ -144,7 +145,8 @@ typedef struct {
*
* \return The corresponding LMS error code.
*/
void unsigned_int_to_network_bytes(unsigned int val, size_t len, unsigned char *bytes);
void unsigned_int_to_network_bytes(unsigned int val, size_t len,
unsigned char *bytes);
/**
* \brief This function converts a network-byte-order
@ -155,7 +157,8 @@ void unsigned_int_to_network_bytes(unsigned int val, size_t len, unsigned char *
*
* \return The corresponding LMS error code.
*/
unsigned int network_bytes_to_unsigned_int(size_t len, const unsigned char *bytes);
unsigned int network_bytes_to_unsigned_int(size_t len,
const unsigned char *bytes);
/**
* \brief This function converts a \ref psa_status_t to a
@ -196,8 +199,8 @@ void mbedtls_lmots_free_public( mbedtls_lmots_public_t *ctx );
*
* \param ctx The initialized LMOTS context store the key in.
* \param key The buffer from which the key will be read.
* #MBEDTLS_LMOTS_PUBLIC_KEY_LEN bytes will be read from
* this.
* #MBEDTLS_LMOTS_PUBLIC_KEY_LEN bytes will be read
* from this.
*
* \return \c 0 on success.
* \return A non-zero error code on failure.
@ -221,7 +224,8 @@ int mbedtls_lmots_import_public_key( mbedtls_lmots_public_t *ctx,
* \param msg The buffer from which the message will be read.
* \param msg_size The size of the message that will be read.
* \param sig The buffer from which the signature will be read.
* #MBEDTLS_LMOTS_SIG_LEN bytes will be read from this.
* #MBEDTLS_LMOTS_SIG_LEN bytes will be read from
* this.
* \param out The buffer where the candidate public key will be
* stored. Must be at least #MBEDTLS_LMOTS_N_HASH_LEN
* bytes in size.
@ -248,7 +252,8 @@ int mbedtls_lmots_calculate_public_key_candidate( const mbedtls_lmots_parameters
*
* \note Before this function is called, the context must
* have been initialized and must contain a public key
* (either by import or calculation from a private key).
* (either by import or calculation from a private
* key).
*
* \param ctx The initialized LMOTS context from which the public
* key will be read.

62
library/lms.c
View File

@ -55,14 +55,20 @@
#endif
#define MBEDTLS_LMS_SIG_Q_LEAF_ID_OFFSET (0)
#define MBEDTLS_LMS_SIG_OTS_SIG_OFFSET (MBEDTLS_LMS_SIG_Q_LEAF_ID_OFFSET + MBEDTLS_LMOTS_Q_LEAF_ID_LEN)
#define MBEDTLS_LMS_SIG_TYPE_OFFSET(otstype) (MBEDTLS_LMS_SIG_OTS_SIG_OFFSET + MBEDTLS_LMOTS_SIG_LEN(otstype))
#define MBEDTLS_LMS_SIG_PATH_OFFSET(otstype) (MBEDTLS_LMS_SIG_TYPE_OFFSET(otstype) + MBEDTLS_LMS_TYPE_LEN)
#define MBEDTLS_LMS_SIG_OTS_SIG_OFFSET (MBEDTLS_LMS_SIG_Q_LEAF_ID_OFFSET + \
MBEDTLS_LMOTS_Q_LEAF_ID_LEN)
#define MBEDTLS_LMS_SIG_TYPE_OFFSET(otstype) (MBEDTLS_LMS_SIG_OTS_SIG_OFFSET + \
MBEDTLS_LMOTS_SIG_LEN(otstype))
#define MBEDTLS_LMS_SIG_PATH_OFFSET(otstype) (MBEDTLS_LMS_SIG_TYPE_OFFSET(otstype) + \
MBEDTLS_LMS_TYPE_LEN)
#define MBEDTLS_LMS_PUBLIC_KEY_TYPE_OFFSET (0)
#define MBEDTLS_LMS_PUBLIC_KEY_OTSTYPE_OFFSET (MBEDTLS_LMS_PUBLIC_KEY_TYPE_OFFSET + MBEDTLS_LMS_TYPE_LEN)
#define MBEDTLS_LMS_PUBLIC_KEY_I_KEY_ID_OFFSET (MBEDTLS_LMS_PUBLIC_KEY_OTSTYPE_OFFSET + MBEDTLS_LMOTS_TYPE_LEN)
#define MBEDTLS_LMS_PUBLIC_KEY_ROOT_NODE_OFFSET (MBEDTLS_LMS_PUBLIC_KEY_I_KEY_ID_OFFSET + MBEDTLS_LMOTS_I_KEY_ID_LEN)
#define MBEDTLS_LMS_PUBLIC_KEY_OTSTYPE_OFFSET (MBEDTLS_LMS_PUBLIC_KEY_TYPE_OFFSET + \
MBEDTLS_LMS_TYPE_LEN)
#define MBEDTLS_LMS_PUBLIC_KEY_I_KEY_ID_OFFSET (MBEDTLS_LMS_PUBLIC_KEY_OTSTYPE_OFFSET + \
MBEDTLS_LMOTS_TYPE_LEN)
#define MBEDTLS_LMS_PUBLIC_KEY_ROOT_NODE_OFFSET (MBEDTLS_LMS_PUBLIC_KEY_I_KEY_ID_OFFSET + \
MBEDTLS_LMOTS_I_KEY_ID_LEN)
/* Currently only support H=10 */
@ -208,7 +214,8 @@ int mbedtls_lms_import_public_key( mbedtls_lms_public_t *ctx,
return( MBEDTLS_ERR_LMS_BUFFER_TOO_SMALL );
}
type = network_bytes_to_unsigned_int( MBEDTLS_LMS_TYPE_LEN, key + MBEDTLS_LMS_PUBLIC_KEY_TYPE_OFFSET );
type = network_bytes_to_unsigned_int( MBEDTLS_LMS_TYPE_LEN,
key + MBEDTLS_LMS_PUBLIC_KEY_TYPE_OFFSET );
if( type != MBEDTLS_LMS_SHA256_M32_H10 )
{
return( MBEDTLS_ERR_LMS_BAD_INPUT_DATA );
@ -216,7 +223,7 @@ int mbedtls_lms_import_public_key( mbedtls_lms_public_t *ctx,
ctx->params.type = type;
otstype = network_bytes_to_unsigned_int( MBEDTLS_LMOTS_TYPE_LEN,
key + MBEDTLS_LMS_PUBLIC_KEY_OTSTYPE_OFFSET );
key + MBEDTLS_LMS_PUBLIC_KEY_OTSTYPE_OFFSET );
if( otstype != MBEDTLS_LMOTS_SHA256_N32_W8 )
{
return( MBEDTLS_ERR_LMS_BAD_INPUT_DATA );
@ -272,14 +279,14 @@ int mbedtls_lms_verify( const mbedtls_lms_public_t *ctx,
}
if( network_bytes_to_unsigned_int( MBEDTLS_LMOTS_TYPE_LEN,
sig + MBEDTLS_LMS_SIG_OTS_SIG_OFFSET + MBEDTLS_LMOTS_SIG_TYPE_OFFSET)
sig + MBEDTLS_LMS_SIG_OTS_SIG_OFFSET + MBEDTLS_LMOTS_SIG_TYPE_OFFSET)
!= MBEDTLS_LMOTS_SHA256_N32_W8 )
{
return( MBEDTLS_ERR_LMS_VERIFY_FAILED );
}
if( network_bytes_to_unsigned_int( MBEDTLS_LMS_TYPE_LEN,
sig + MBEDTLS_LMS_SIG_TYPE_OFFSET(ctx->params.otstype))
sig + MBEDTLS_LMS_SIG_TYPE_OFFSET(ctx->params.otstype))
!= MBEDTLS_LMS_SHA256_M32_H10 )
{
return( MBEDTLS_ERR_LMS_VERIFY_FAILED );
@ -287,7 +294,7 @@ int mbedtls_lms_verify( const mbedtls_lms_public_t *ctx,
q_leaf_identifier = network_bytes_to_unsigned_int( MBEDTLS_LMOTS_Q_LEAF_ID_LEN,
sig + MBEDTLS_LMS_SIG_Q_LEAF_ID_OFFSET );
sig + MBEDTLS_LMS_SIG_Q_LEAF_ID_OFFSET );
if( q_leaf_identifier >= MERKLE_TREE_LEAF_NODE_AM(ctx->params.type) )
{
@ -302,12 +309,10 @@ int mbedtls_lms_verify( const mbedtls_lms_public_t *ctx,
ots_params.q_leaf_identifier );
ots_params.type = ctx->params.otstype;
ret = mbedtls_lmots_calculate_public_key_candidate( &ots_params, msg, msg_size,
sig + MBEDTLS_LMS_SIG_OTS_SIG_OFFSET,
MBEDTLS_LMOTS_SIG_LEN(ctx->params.otstype),
Kc_candidate_ots_pub_key,
sizeof(Kc_candidate_ots_pub_key),
NULL );
ret = mbedtls_lmots_calculate_public_key_candidate( &ots_params, msg,
msg_size, sig + MBEDTLS_LMS_SIG_OTS_SIG_OFFSET,
MBEDTLS_LMOTS_SIG_LEN(ctx->params.otstype), Kc_candidate_ots_pub_key,
sizeof(Kc_candidate_ots_pub_key), NULL );
if( ret )
{
return( ret );
@ -319,7 +324,8 @@ int mbedtls_lms_verify( const mbedtls_lms_public_t *ctx,
MERKLE_TREE_INTERNAL_NODE_AM(ctx->params.type) + q_leaf_identifier,
Tc_candidate_root_node );
curr_node_id = MERKLE_TREE_INTERNAL_NODE_AM(ctx->params.type) + q_leaf_identifier;
curr_node_id = MERKLE_TREE_INTERNAL_NODE_AM(ctx->params.type) +
q_leaf_identifier;
for( height = 0; height < MBEDTLS_LMS_H_TREE_HEIGHT(ctx->params.type);
height++ )
@ -389,7 +395,8 @@ static int calculate_merkle_tree( mbedtls_lms_private_t *ctx,
ret = create_merkle_internal_value( &ctx->params,
&tree[(r_node_idx * 2) * MBEDTLS_LMS_M_NODE_BYTES(ctx->params.type)],
&tree[(r_node_idx * 2 + 1) * MBEDTLS_LMS_M_NODE_BYTES(ctx->params.type)],
r_node_idx, &tree[r_node_idx * MBEDTLS_LMS_M_NODE_BYTES(ctx->params.type)] );
r_node_idx,
&tree[r_node_idx * MBEDTLS_LMS_M_NODE_BYTES(ctx->params.type)] );
if( ret )
{
return( ret );
@ -587,7 +594,8 @@ int mbedtls_lms_calculate_public_key( mbedtls_lms_public_t *ctx,
}
int mbedtls_lms_export_public_key( mbedtls_lms_public_t *ctx, unsigned char *key,
int mbedtls_lms_export_public_key( mbedtls_lms_public_t *ctx,
unsigned char *key,
size_t key_size, size_t *key_len )
{
if( key_size < MBEDTLS_LMS_PUBLIC_KEY_LEN(ctx->params.type) ) {
@ -602,9 +610,8 @@ int mbedtls_lms_export_public_key( mbedtls_lms_public_t *ctx, unsigned char *key
unsigned_int_to_network_bytes(
ctx->params.type,
MBEDTLS_LMS_TYPE_LEN, key + MBEDTLS_LMS_PUBLIC_KEY_TYPE_OFFSET );
unsigned_int_to_network_bytes(
ctx->params.otstype,
MBEDTLS_LMOTS_TYPE_LEN, key + MBEDTLS_LMS_PUBLIC_KEY_OTSTYPE_OFFSET );
unsigned_int_to_network_bytes( ctx->params.otstype, MBEDTLS_LMOTS_TYPE_LEN,
key + MBEDTLS_LMS_PUBLIC_KEY_OTSTYPE_OFFSET );
memcpy( key + MBEDTLS_LMS_PUBLIC_KEY_I_KEY_ID_OFFSET,
ctx->params.I_key_identifier,
MBEDTLS_LMOTS_I_KEY_ID_LEN );
@ -671,15 +678,14 @@ int mbedtls_lms_sign( mbedtls_lms_private_t *ctx,
return( ret );
}
unsigned_int_to_network_bytes( ctx->params.type,
MBEDTLS_LMS_TYPE_LEN,
sig + MBEDTLS_LMS_SIG_TYPE_OFFSET(ctx->params.otstype) );
unsigned_int_to_network_bytes( ctx->params.type, MBEDTLS_LMS_TYPE_LEN,
sig + MBEDTLS_LMS_SIG_TYPE_OFFSET(ctx->params.otstype) );
unsigned_int_to_network_bytes( q_leaf_identifier, MBEDTLS_LMOTS_Q_LEAF_ID_LEN,
sig + MBEDTLS_LMS_SIG_Q_LEAF_ID_OFFSET);
ret = get_merkle_path( ctx,
MERKLE_TREE_INTERNAL_NODE_AM(ctx->params.type) + q_leaf_identifier,
sig + MBEDTLS_LMS_SIG_PATH_OFFSET(ctx->params.otstype) );
MERKLE_TREE_INTERNAL_NODE_AM(ctx->params.type) + q_leaf_identifier,
sig + MBEDTLS_LMS_SIG_PATH_OFFSET(ctx->params.otstype) );
if( ret )
{
return( ret );