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-rw-r--r--librecrypt_make_settings.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/librecrypt_make_settings.c b/librecrypt_make_settings.c
index 84270d1..89a73fb 100644
--- a/librecrypt_make_settings.c
+++ b/librecrypt_make_settings.c
@@ -45,6 +45,201 @@ enosys:
#else
+#define ALPHABET "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
+
+NONSTRING static const char encoding_lut[256u] = MAKE_ENCODING_LUT(ALPHABET);
+
+static const unsigned char decoding_lut[256u] = {
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, 62, XX, XX, XX, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, XX, XX, XX, XX, XX, XX,
+ XX, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, XX, XX, XX, XX, XX,
+ XX, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,
+ XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX
+};
+
+static unsigned
+rot4_is_algorithm(const char *settings, size_t len)
+{
+ if (len >= sizeof("$rot4$") - 1u)
+ if (!strncmp(settings, "$rot4$", sizeof("$rot4$") - 1u))
+ return 1u;
+ return 0u;
+}
+
+static unsigned
+trunc_is_algorithm(const char *settings, size_t len)
+{
+ if (len >= sizeof("$trunc$") - 1u)
+ if (!strncmp(settings, "$trunc$", sizeof("$trunc$") - 1u))
+ return 1u;
+ return 0u;
+}
+
+static int
+rot4_supported(const char *phrase, size_t len, int text, const char *settings,
+ size_t prefix, size_t *len_out)
+{
+ size_t i, j, n;
+
+ (void) phrase;
+ (void) len;
+ (void) text;
+
+ i = sizeof("$rot4$") - 1u;
+ if (prefix < i || memcmp(settings, "$rot4$", prefix))
+ return 0;
+ n = i - prefix;
+ if (n && n != 12u)
+ return 0;
+ if (n == 12u) {
+ for (j = 0u; j < 11u; j++, i++)
+ if (decoding_lut[(unsigned char)settings[i]] == XX)
+ return 0;
+ if (decoding_lut[(unsigned char)settings[i]] != '#')
+ return 0;
+ }
+
+ *len_out = 8u;
+ return 1;
+}
+
+static int
+trunc_supported(const char *phrase, size_t len, int text, const char *settings,
+ size_t prefix, size_t *len_out)
+{
+ size_t i, digit, n = 0u, q, r;
+
+ (void) phrase;
+ (void) len;
+ (void) text;
+
+ if (prefix < sizeof("$trunc$") - 1u || memcmp(settings, "$trunc$", sizeof("$trunc$") - 1u))
+ return 0;
+
+ if (prefix == sizeof("$trunc$") - 1u) {
+ *len_out = 4u;
+ return 1;
+ }
+
+ if (settings[sizeof("$trunc$") - 1u] == '*') {
+ for (i = sizeof("$trunc$*") - 1u; i < prefix; i++) {
+ if ('0' > settings[i] || settings[i] > '9')
+ return 0;
+ digit = (size_t)(settings[i] - '0');
+ if (n > (SIZE_MAX - digit) / 10u)
+ return 0;
+ n = n * 10u + digit;
+ }
+ } else {
+ for (i = sizeof("$trunc$") - 1u; i < prefix; i++) {
+ if (settings[i] == '@')
+ break;
+ if (decoding_lut[(unsigned char)settings[i]] == XX)
+ return 0;
+ n += 1u;
+ }
+ q = n / 4u;
+ r = n % 4u;
+ if (r == 1u)
+ return 0;
+ n = q * 3u + r;
+ if (r) {
+ n -= 1u;
+ for (; r < 4u && i < prefix; r++, i++)
+ if (settings[i] != '@')
+ break;
+ if (r != 4u || i != prefix)
+ return 0;
+ }
+ }
+ if (!n)
+ return 0;
+ *len_out = n;
+ return 1;
+}
+
+static ssize_t
+rot4_make_settings(char *out_buffer, size_t size, const char *algorithm,
+ size_t memcost, uintmax_t timecost, int gensalt,
+ ssize_t (*rng)(void *out, size_t n, void *user), void *user)
+{
+ size_t ret = sizeof("$rot4$") - 1u;
+
+ (void) algorithm;
+ (void) memcost;
+ (void) timecost;
+ (void) gensalt;
+ (void) rng;
+ (void) user;
+
+ if (size) {
+ size = MIN(ret, size - 1u);
+ memcpy(out_buffer, "$rot4$", size);
+ out_buffer[size] = '\0';
+ }
+
+ return (ssize_t) ret;
+}
+
+static ssize_t
+trunc_make_settings(char *out_buffer, size_t size, const char *algorithm,
+ size_t memcost, uintmax_t timecost, int gensalt,
+ ssize_t (*rng)(void *out, size_t n, void *user), void *user)
+{
+ size_t ret = sizeof("$trunc$*4") - 1u;
+
+ (void) algorithm;
+ (void) memcost;
+ (void) timecost;
+ (void) gensalt;
+ (void) rng;
+ (void) user;
+
+ if (size) {
+ size = MIN(ret, size - 1u);
+ memcpy(out_buffer, "$trunc$*4", size);
+ out_buffer[size] = '\0';
+ }
+
+ return (ssize_t)ret;
+}
+
+static const struct librecrypt_algorithm rot4_algo = {
+ .is_algorithm = &rot4_is_algorithm,
+ .test_supported = &rot4_supported,
+ .make_settings = &rot4_make_settings,
+ .encoding_lut = encoding_lut,
+ .decoding_lut = decoding_lut,
+ .hash_size = 8u,
+ .flexible_hash_size = 0,
+ .strict_pad = 1,
+ .pad = '#'
+};
+
+static const struct librecrypt_algorithm trunc_algo = {
+ .is_algorithm = &trunc_is_algorithm,
+ .test_supported = &trunc_supported,
+ .make_settings = &trunc_make_settings,
+ .encoding_lut = encoding_lut,
+ .decoding_lut = decoding_lut,
+ .hash_size = 4u,
+ .flexible_hash_size = 1,
+ .strict_pad = 1,
+ .pad = '@'
+};
+
+
static unsigned char saltbyte = 0u;
@@ -72,6 +267,8 @@ saltfail(void *out, size_t n, void *user)
int
main(void)
{
+ const struct librecrypt_algorithm custom[] = {rot4_algo, trunc_algo};
+ LIBRECRYPT_CONTEXT *ctx = librecrypt_create_context();
char buf[1024];
char buf2[sizeof(buf)];
int any_supported = 0;
@@ -195,6 +392,31 @@ main(void)
EXPECT(errno == ENOSYS);
}
+ ctx = librecrypt_create_context();
+ assert(ctx != NULL);
+
+ librecrypt_set_custom_algorithms(ctx, custom, ELEMSOF(custom));
+
+ CANARY_FILL(buf);
+ r = librecrypt_make_settings(buf, sizeof(buf), "$rot4$", 0u, 0u, 0, NULL, NULL, ctx);
+ EXPECT(r == (ssize_t)(sizeof("$rot4$") - 1u));
+ EXPECT(!strcmp(buf, "$rot4$"));
+ CANARY_CHECK(buf, (size_t)r + 1u);
+
+ CANARY_FILL(buf);
+ r = librecrypt_make_settings(buf, sizeof(buf), "$trunc$", 0u, 0u, 0, NULL, NULL, ctx);
+ EXPECT(r == (ssize_t)(sizeof("$trunc$*4") - 1u));
+ EXPECT(!strcmp(buf, "$trunc$*4"));
+ CANARY_CHECK(buf, (size_t)r + 1u);
+
+ CANARY_FILL(buf);
+ r = librecrypt_make_settings(buf, sizeof(buf), "$trunc$*6", 0u, 0u, 0, NULL, NULL, ctx);
+ EXPECT(r == (ssize_t)(sizeof("$trunc$*4") - 1u));
+ EXPECT(!strcmp(buf, "$trunc$*4"));
+ CANARY_CHECK(buf, (size_t)r + 1u);
+
+ librecrypt_free_context(ctx);
+
STOP_RESOURCE_TEST();
return 0;
}
generated by cgit v1.3.1 (git 2.54.0) at 2026-10-20 17:57:35 +0000