mbedtls/programs/psa/psa_constant_names.c
Gilles Peskine 3f775264d3 psa_constant_names: adding support for signed types
psa_constant_names now works correctly with signed values, such as
psa_status_t may have.
2019-02-13 18:46:51 +01:00

267 lines
8.7 KiB
C

#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "psa/crypto.h"
/* This block is present to support Visual Studio builds prior to 2015 */
#if defined(_MSC_VER) && _MSC_VER < 1900
#include <stdarg.h>
int snprintf( char *s, size_t n, const char *fmt, ... )
{
int ret;
va_list argp;
/* Avoid calling the invalid parameter handler by checking ourselves */
if( s == NULL || n == 0 || fmt == NULL )
return( -1 );
va_start( argp, fmt );
#if defined(_TRUNCATE) && !defined(__MINGW32__)
ret = _vsnprintf_s( s, n, _TRUNCATE, fmt, argp );
#else
ret = _vsnprintf( s, n, fmt, argp );
if( ret < 0 || (size_t) ret == n )
{
s[n-1] = '\0';
ret = -1;
}
#endif
va_end( argp );
return( ret );
}
#endif
/* There are different GET_HASH macros for different kinds of algorithms
* built from hashes, but the values are all constructed on the
* same model. */
#define PSA_ALG_GET_HASH(alg) \
(((alg) & PSA_ALG_HASH_MASK) | PSA_ALG_CATEGORY_HASH)
static void append(char **buffer, size_t buffer_size,
size_t *required_size,
const char *string, size_t length)
{
*required_size += length;
if (*required_size < buffer_size) {
memcpy(*buffer, string, length);
*buffer += length;
}
}
static void append_integer(char **buffer, size_t buffer_size,
size_t *required_size,
const char *format /*printf format for value*/,
unsigned long value)
{
size_t n = snprintf(*buffer, buffer_size - *required_size, format, value);
if (n < buffer_size - *required_size) *buffer += n;
*required_size += n;
}
/* The code of these function is automatically generated and included below. */
static const char *psa_ecc_curve_name(psa_ecc_curve_t curve);
static const char *psa_hash_algorithm_name(psa_algorithm_t hash_alg);
static void append_with_curve(char **buffer, size_t buffer_size,
size_t *required_size,
const char *string, size_t length,
psa_ecc_curve_t curve)
{
const char *curve_name = psa_ecc_curve_name(curve);
append(buffer, buffer_size, required_size, string, length);
append(buffer, buffer_size, required_size, "(", 1);
if (curve_name != NULL) {
append(buffer, buffer_size, required_size,
curve_name, strlen(curve_name));
} else {
append_integer(buffer, buffer_size, required_size,
"0x%04x", curve);
}
append(buffer, buffer_size, required_size, ")", 1);
}
static void append_with_hash(char **buffer, size_t buffer_size,
size_t *required_size,
const char *string, size_t length,
psa_algorithm_t hash_alg)
{
const char *hash_name = psa_hash_algorithm_name(hash_alg);
append(buffer, buffer_size, required_size, string, length);
append(buffer, buffer_size, required_size, "(", 1);
if (hash_name != NULL) {
append(buffer, buffer_size, required_size,
hash_name, strlen(hash_name));
} else {
append_integer(buffer, buffer_size, required_size,
"0x%08lx", hash_alg);
}
append(buffer, buffer_size, required_size, ")", 1);
}
#include "psa_constant_names_generated.c"
static int psa_snprint_status(char *buffer, size_t buffer_size,
psa_status_t status)
{
const char *name = psa_strerror(status);
if (name == NULL) {
return snprintf(buffer, buffer_size, "%ld", (long) status);
} else {
size_t length = strlen(name);
if (length < buffer_size) {
memcpy(buffer, name, length + 1);
return (int) length;
} else {
return (int) buffer_size;
}
}
}
static int psa_snprint_ecc_curve(char *buffer, size_t buffer_size,
psa_ecc_curve_t curve)
{
const char *name = psa_ecc_curve_name(curve);
if (name == NULL) {
return snprintf(buffer, buffer_size, "0x%04x", (unsigned) curve);
} else {
size_t length = strlen(name);
if (length < buffer_size) {
memcpy(buffer, name, length + 1);
return (int) length;
} else {
return (int) buffer_size;
}
}
}
static void usage(const char *program_name)
{
printf("Usage: %s TYPE VALUE [VALUE...]\n",
program_name == NULL ? "psa_constant_names" : program_name);
printf("Print the symbolic name whose numerical value is VALUE in TYPE.\n");
printf("Supported types (with = between aliases):\n");
printf(" alg=algorithm Algorithm (psa_algorithm_t)\n");
printf(" curve=ecc_curve Elliptic curve identifier (psa_ecc_curve_t)\n");
printf(" type=key_type Key type (psa_key_type_t)\n");
printf(" usage=key_usage Key usage (psa_key_usage_t)\n");
printf(" error=status Status code (psa_status_t)\n");
}
typedef enum {
TYPE_STATUS,
} signed_value_type;
int process_signed(signed_value_type type, long min, long max, char **argp)
{
for (; *argp != NULL; argp++) {
char buffer[200];
char *end;
long value = strtol(*argp, &end, 0);
if (*end) {
printf("Non-numeric value: %s\n", *argp);
return EXIT_FAILURE;
}
if (value < min || (errno == ERANGE && value < 0)) {
printf("Value too small: %s\n", *argp);
return EXIT_FAILURE;
}
if (value > max || (errno == ERANGE && value > 0)) {
printf("Value too large: %s\n", *argp);
return EXIT_FAILURE;
}
switch (type) {
case TYPE_STATUS:
psa_snprint_status(buffer, sizeof(buffer),
(psa_status_t) value);
break;
}
puts(buffer);
}
return EXIT_SUCCESS;
}
typedef enum {
TYPE_ALGORITHM,
TYPE_ECC_CURVE,
TYPE_KEY_TYPE,
TYPE_KEY_USAGE,
} unsigned_value_type;
int process_unsigned(unsigned_value_type type, unsigned long max, char **argp)
{
for (; *argp != NULL; argp++) {
char buffer[200];
char *end;
unsigned long value = strtoul(*argp, &end, 0);
if (*end) {
printf("Non-numeric value: %s\n", *argp);
return EXIT_FAILURE;
}
if (value > max || errno == ERANGE) {
printf("Value out of range: %s\n", *argp);
return EXIT_FAILURE;
}
switch (type) {
case TYPE_ALGORITHM:
psa_snprint_algorithm(buffer, sizeof(buffer),
(psa_algorithm_t) value);
break;
case TYPE_ECC_CURVE:
psa_snprint_ecc_curve(buffer, sizeof(buffer),
(psa_ecc_curve_t) value);
break;
case TYPE_KEY_TYPE:
psa_snprint_key_type(buffer, sizeof(buffer),
(psa_key_type_t) value);
break;
case TYPE_KEY_USAGE:
psa_snprint_key_usage(buffer, sizeof(buffer),
(psa_key_usage_t) value);
break;
}
puts(buffer);
}
return EXIT_SUCCESS;
}
int main(int argc, char *argv[])
{
if (argc <= 1 ||
!strcmp(argv[1], "help") ||
!strcmp(argv[1], "--help"))
{
usage(argv[0]);
return EXIT_FAILURE;
}
if (!strcmp(argv[1], "error") || !strcmp(argv[1], "status")) {
/* There's no way to obtain the actual range of a signed type,
* so hard-code it here: psa_status_t is int32_t. */
return process_signed(TYPE_STATUS, INT32_MIN, INT32_MAX,
argv + 2);
} else if (!strcmp(argv[1], "alg") || !strcmp(argv[1], "algorithm")) {
return process_unsigned(TYPE_ALGORITHM, (psa_algorithm_t) (-1),
argv + 2);
} else if (!strcmp(argv[1], "curve") || !strcmp(argv[1], "ecc_curve")) {
return process_unsigned(TYPE_ECC_CURVE, (psa_ecc_curve_t) (-1),
argv + 2);
} else if (!strcmp(argv[1], "type") || !strcmp(argv[1], "key_type")) {
return process_unsigned(TYPE_KEY_TYPE, (psa_key_type_t) (-1),
argv + 2);
} else if (!strcmp(argv[1], "usage") || !strcmp(argv[1], "key_usage")) {
return process_unsigned(TYPE_KEY_USAGE, (psa_key_usage_t) (-1),
argv + 2);
} else {
printf("Unknown type: %s\n", argv[1]);
return EXIT_FAILURE;
}
}