6bd54d48f
Denis Vlasenko
2008-11-13
Subject
libbb/pw_encrypt_sha: -28 bytes
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libbb/pw_encrypt_sha.c+9 -11
| @@ -196,25 +196,23 @@ do { \ | |
| resptr = to64(resptr, w, N); \ | |
| } while (0) | |
| if (is_sha512 == '5') { | |
| - | unsigned i = 0; |
| - | unsigned j = 10; |
| - | unsigned k = 20; |
| - | /* strange swap of one byte (see below why) */ |
| - | unsigned char alt_result_31 = alt_result[31]; |
| - | alt_result[31] = alt_result[1]; |
| + | int i = 0; |
| + | int j = 10; |
| + | int k = 20; |
| while (1) { | |
| b64_from_24bit(alt_result[i], alt_result[j], alt_result[k], 4); | |
| if (i == 9) | |
| break; | |
| - | i += 21; i = (((i >> 4) & 2) + i) & 0x1f; |
| - | j += 21; j = (((j >> 4) & 2) + j) & 0x1f; |
| - | k += 21; k = (((k >> 4) & 2) + k) & 0x1f; |
| + | /* 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); |
| } | |
| - | b64_from_24bit(0, alt_result_31, alt_result[30], 3); |
| + | b64_from_24bit(0, alt_result[31], alt_result[30], 3); |
| /* was: | |
| b64_from_24bit(alt_result[0], alt_result[10], alt_result[20], 4); | |
| b64_from_24bit(alt_result[21], alt_result[1], alt_result[11], 4); | |
| - | ...............................^^^^^^^^^^^^^ why [1] and not [31]? |
| b64_from_24bit(alt_result[12], alt_result[22], alt_result[2], 4); | |
| b64_from_24bit(alt_result[3], alt_result[13], alt_result[23], 4); | |
| b64_from_24bit(alt_result[24], alt_result[4], alt_result[14], 4); | |