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authorDenis Vlasenko <vda.linux@googlemail.com>2008-11-13 13:25:18 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2008-11-13 13:25:18 +0000
commit3470f9297ef179dd327031351a2ac1feccce32f6 (patch)
treeb2b6b6974f150ce9c9b2824f43defca8f66a1c6f /libbb
parent6bd54d48f44b65464dd637add13292ca8189e1ef (diff)
downloadbusybox-3470f9297ef179dd327031351a2ac1feccce32f6.tar.gz
libbb: sha_crypt -123 bytes
Diffstat (limited to 'libbb')
-rw-r--r--libbb/pw_encrypt_sha.c64
1 files changed, 34 insertions, 30 deletions
diff --git a/libbb/pw_encrypt_sha.c b/libbb/pw_encrypt_sha.c
index 3dbaeabc9..3173506f5 100644
--- a/libbb/pw_encrypt_sha.c
+++ b/libbb/pw_encrypt_sha.c
@@ -26,16 +26,22 @@ sha_crypt(/*const*/ char *key_data, /*const*/ char *salt_data)
char *result, *resptr;
/* btw, sha256 needs [32] and uint32_t only */
- unsigned char alt_result[64] __attribute__((__aligned__(__alignof__(uint64_t))));
- unsigned char temp_result[64] __attribute__((__aligned__(__alignof__(uint64_t))));
- union {
- sha256_ctx_t x;
- sha512_ctx_t y;
- } ctx;
- union {
- sha256_ctx_t x;
- sha512_ctx_t y;
- } alt_ctx;
+ struct {
+ unsigned char alt_result[64];
+ unsigned char temp_result[64];
+ union {
+ sha256_ctx_t x;
+ sha512_ctx_t y;
+ } ctx;
+ union {
+ sha256_ctx_t x;
+ sha512_ctx_t y;
+ } alt_ctx;
+ } L __attribute__((__aligned__(__alignof__(uint64_t))));
+#define alt_result (L.alt_result )
+#define temp_result (L.temp_result)
+#define ctx (L.ctx )
+#define alt_ctx (L.alt_ctx )
unsigned salt_len;
unsigned key_len;
unsigned cnt;
@@ -186,7 +192,6 @@ sha_crypt(/*const*/ char *key_data, /*const*/ char *salt_data)
sha_end(alt_result, &ctx);
}
-
/* Append encrypted password to result buffer */
//TODO: replace with something like
// bb_uuencode(cp, src, length, bb_uuenc_tbl_XXXbase64);
@@ -196,18 +201,16 @@ do { \
resptr = to64(resptr, w, N); \
} while (0)
if (is_sha512 == '5') {
- int i = 0;
- int j = 10;
- int k = 20;
+ unsigned i = 0;
while (1) {
+ unsigned j = i + 10;
+ unsigned k = i + 20;
+ if (j >= 30) j -= 30;
+ if (k >= 30) k -= 30;
b64_from_24bit(alt_result[i], alt_result[j], alt_result[k], 4);
- if (i == 9)
+ if (k == 29)
break;
- /* if x - 9 produces < 0, subtract 2 more:
- * ((i >> 8) << 1) is either 0 or binary 111111...1110 */
- i -= 9; i = (i & 0x1f) + ((i >> 8) << 1);
- j -= 9; j = (j & 0x1f) + ((j >> 8) << 1);
- k -= 9; k = (k & 0x1f) + ((k >> 8) << 1);
+ i = k + 1;
}
b64_from_24bit(0, alt_result[31], alt_result[30], 3);
/* was:
@@ -225,15 +228,15 @@ do { \
*/
} else {
unsigned i = 0;
- unsigned j = 21;
- unsigned k = 42;
while (1) {
+ unsigned j = i + 21;
+ unsigned k = i + 42;
+ if (j >= 63) j -= 63;
+ if (k >= 63) k -= 63;
b64_from_24bit(alt_result[i], alt_result[j], alt_result[k], 4);
- if (i == 62)
+ if (j == 20)
break;
- i += 22; i = ((i >> 6) + i) & 0x3f;
- j += 22; j = ((j >> 6) + j) & 0x3f;
- k += 22; k = ((k >> 6) + k) & 0x3f;
+ i = j + 1;
}
b64_from_24bit(0, 0, alt_result[63], 2);
/* was:
@@ -267,10 +270,7 @@ do { \
/* Clear the buffer for the intermediate result so that people
attaching to processes or reading core dumps cannot get any
information. */
- memset(temp_result, 0, sizeof(temp_result));
- memset(alt_result, 0, sizeof(alt_result));
- memset(&ctx, 0, sizeof(ctx));
- memset(&alt_ctx, 0, sizeof(alt_ctx));
+ memset(&L, 0, sizeof(L)); /* [alt]_ctx and XXX_result buffers */
memset(key_data, 0, key_len); /* also p_bytes */
memset(salt_data, 0, salt_len); /* also s_bytes */
free(key_data);
@@ -279,4 +279,8 @@ do { \
#undef s_bytes
return result;
+#undef alt_result
+#undef temp_result
+#undef ctx
+#undef alt_ctx
}