diff options
Diffstat (limited to 'libbb/pw_encrypt_des.c')
| -rw-r--r-- | libbb/pw_encrypt_des.c | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/libbb/pw_encrypt_des.c b/libbb/pw_encrypt_des.c index dcd3521..fe8237c 100644 --- a/libbb/pw_encrypt_des.c +++ b/libbb/pw_encrypt_des.c @@ -363,7 +363,7 @@ des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx) old_rawkey0 = old_rawkey1 = 0; old_salt = 0; #endif - saltbits = 0; + //saltbits = 0; /* not needed: we call setup_salt() before do_des() */ bits28 = bits32 + 4; bits24 = bits28 + 4; @@ -481,12 +481,11 @@ des_init(struct des_ctx *ctx, const struct const_des_ctx *cctx) return ctx; } - +/* Accepts 24-bit salt at max */ static void setup_salt(struct des_ctx *ctx, uint32_t salt) { - uint32_t obit, saltbit; - int i; + uint32_t invbits; #if USE_REPETITIVE_SPEEDUP if (salt == old_salt) @@ -494,15 +493,15 @@ setup_salt(struct des_ctx *ctx, uint32_t salt) old_salt = salt; #endif - saltbits = 0; - saltbit = 1; - obit = 0x800000; - for (i = 0; i < 24; i++) { - if (salt & saltbit) - saltbits |= obit; - saltbit <<= 1; - obit >>= 1; - } + invbits = 0; + + salt |= (1 << 24); + do { + invbits = (invbits << 1) + (salt & 1); + salt >>= 1; + } while (salt != 1); + + saltbits = invbits; } static void @@ -736,14 +735,14 @@ des_crypt(struct des_ctx *ctx, char output[DES_OUT_BUFSIZE], des_setkey(ctx, (char *)keybuf); /* - * salt_str - 2 bytes of salt + * salt_str - 2 chars of salt (converted to 12 bits) * key - up to 8 characters */ output[0] = salt_str[0]; output[1] = salt_str[1]; salt = (ascii_to_bin(salt_str[1]) << 6) | ascii_to_bin(salt_str[0]); - setup_salt(ctx, salt); + setup_salt(ctx, salt); /* set ctx->saltbits for do_des() */ /* Do it. */ do_des(ctx, /*0, 0,*/ &r0, &r1, 25 /* count */); |