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libbb: sha_crypt -123 bytes

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This commit is contained in:
Denis Vlasenko 2008-11-13 13:25:18 +00:00
parent 6bd54d48f4
commit 3470f9297e
1 changed files with 34 additions and 30 deletions
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64
libbb/pw_encrypt_sha.c
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@ -26,16 +26,22 @@ sha_crypt(/*const*/ char *key_data, /*const*/ char *salt_data)
char *result, *resptr; char *result, *resptr;
/* btw, sha256 needs [32] and uint32_t only */ /* btw, sha256 needs [32] and uint32_t only */
unsigned char alt_result[64] __attribute__((__aligned__(__alignof__(uint64_t)))); struct {
unsigned char temp_result[64] __attribute__((__aligned__(__alignof__(uint64_t)))); unsigned char alt_result[64];
union { unsigned char temp_result[64];
sha256_ctx_t x; union {
sha512_ctx_t y; sha256_ctx_t x;
} ctx; sha512_ctx_t y;
union { } ctx;
sha256_ctx_t x; union {
sha512_ctx_t y; sha256_ctx_t x;
} alt_ctx; 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 salt_len;
unsigned key_len; unsigned key_len;
unsigned cnt; unsigned cnt;
@ -186,7 +192,6 @@ sha_crypt(/*const*/ char *key_data, /*const*/ char *salt_data)
sha_end(alt_result, &ctx); sha_end(alt_result, &ctx);
} }
/* Append encrypted password to result buffer */ /* Append encrypted password to result buffer */
//TODO: replace with something like //TODO: replace with something like
// bb_uuencode(cp, src, length, bb_uuenc_tbl_XXXbase64); // bb_uuencode(cp, src, length, bb_uuenc_tbl_XXXbase64);
@ -196,18 +201,16 @@ do { \
resptr = to64(resptr, w, N); \ resptr = to64(resptr, w, N); \
} while (0) } while (0)
if (is_sha512 == '5') { if (is_sha512 == '5') {
int i = 0; unsigned i = 0;
int j = 10;
int k = 20;
while (1) { 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); b64_from_24bit(alt_result[i], alt_result[j], alt_result[k], 4);
if (i == 9) if (k == 29)
break; break;
/* if x - 9 produces < 0, subtract 2 more: i = k + 1;
* ((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);
} }
b64_from_24bit(0, alt_result[31], alt_result[30], 3); b64_from_24bit(0, alt_result[31], alt_result[30], 3);
/* was: /* was:
@ -225,15 +228,15 @@ do { \
*/ */
} else { } else {
unsigned i = 0; unsigned i = 0;
unsigned j = 21;
unsigned k = 42;
while (1) { 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); b64_from_24bit(alt_result[i], alt_result[j], alt_result[k], 4);
if (i == 62) if (j == 20)
break; break;
i += 22; i = ((i >> 6) + i) & 0x3f; i = j + 1;
j += 22; j = ((j >> 6) + j) & 0x3f;
k += 22; k = ((k >> 6) + k) & 0x3f;
} }
b64_from_24bit(0, 0, alt_result[63], 2); b64_from_24bit(0, 0, alt_result[63], 2);
/* was: /* was:
@ -267,10 +270,7 @@ do { \
/* Clear the buffer for the intermediate result so that people /* Clear the buffer for the intermediate result so that people
attaching to processes or reading core dumps cannot get any attaching to processes or reading core dumps cannot get any
information. */ information. */
memset(temp_result, 0, sizeof(temp_result)); memset(&L, 0, sizeof(L)); /* [alt]_ctx and XXX_result buffers */
memset(alt_result, 0, sizeof(alt_result));
memset(&ctx, 0, sizeof(ctx));
memset(&alt_ctx, 0, sizeof(alt_ctx));
memset(key_data, 0, key_len); /* also p_bytes */ memset(key_data, 0, key_len); /* also p_bytes */
memset(salt_data, 0, salt_len); /* also s_bytes */ memset(salt_data, 0, salt_len); /* also s_bytes */
free(key_data); free(key_data);
@ -279,4 +279,8 @@ do { \
#undef s_bytes #undef s_bytes
return result; return result;
#undef alt_result
#undef temp_result
#undef ctx
#undef alt_ctx
} }