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libbb: code shrink in DES crypt

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function                                             old     new   delta
pw_encrypt                                           941     945      +4
bits32                                               128       -    -128
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/0 up/down: 4/-128)           Total: -124 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2025-07-06 19:14:09 +02:00
parent 23b5527f5c
commit 82bbbd2e53
1 changed files with 7 additions and 11 deletions
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18
libbb/pw_encrypt_des.c
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@ -186,17 +186,6 @@ static const uint8_t pbox[32] ALIGN1 = {
2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
};
static const uint32_t bits32[32] ALIGN4 = {
0x80000000, 0x40000000, 0x20000000, 0x10000000,
0x08000000, 0x04000000, 0x02000000, 0x01000000,
0x00800000, 0x00400000, 0x00200000, 0x00100000,
0x00080000, 0x00040000, 0x00020000, 0x00010000,
0x00008000, 0x00004000, 0x00002000, 0x00001000,
0x00000800, 0x00000400, 0x00000200, 0x00000100,
0x00000080, 0x00000040, 0x00000020, 0x00000010,
0x00000008, 0x00000004, 0x00000002, 0x00000001
};
static const uint8_t bits8[8] ALIGN1 = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
@ -335,11 +324,18 @@ des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx)
int i, j, b, k, inbit, obit;
uint32_t p;
const uint32_t *bits28, *bits24;
uint32_t bits32[32];
if (!ctx)
ctx = xmalloc(sizeof(*ctx));
const_ctx = cctx;
p = 0x80000000U;
for (i = 0; p; i++) {
bits32[i] = p;
p >>= 1;
}
#if USE_REPETITIVE_SPEEDUP
old_rawkey0 = old_rawkey1 = 0;
old_salt = 0;