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authorDavid Phillips <david@sighup.nz>2017-05-28 18:58:15 +1200
committerDavid Phillips <david@sighup.nz>2017-05-28 19:00:32 +1200
commitd3430352e7a38cffd796c645281d9433f0ea8f00 (patch)
tree811e0594d09bba402afdff1dce8694722ea1534f
parent194f2dd5d0f4de73e73e0621e60ed4b73e09c2be (diff)
downloadsand-leek-d3430352e7a38cffd796c645281d9433f0ea8f00.tar.xz
Remove ssse3 algorithm, tighten decoder
-rw-r--r--onion_base32.c81
-rw-r--r--onion_base32.h4
2 files changed, 7 insertions, 78 deletions
diff --git a/onion_base32.c b/onion_base32.c
index 6f1713d..7863f8c 100644
--- a/onion_base32.c
+++ b/onion_base32.c
@@ -37,17 +37,16 @@ onion_base32(char output[16], unsigned char sum[20]) {
unsigned char
base32_dec_single(char b) {
- int ret = 0;
+ if (b >= 'a' && b <= 'z')
+ return b - 'a';
+ else if (b >= '2' && b <= '7')
+ return b - '2' + 26;
- if (b < 'a')
- ret = b - '2' + 26;
- else
- ret = b - 'a';
-
- printf("%d «%d»\n", ret, b);
- return ret;
+ return 0;
}
+/* Simple algorithm to decode a 16-byte base32 sequence to the 10 bytes
+ * it represents, placing the result in dec */
void
onion_base32_dec(unsigned char dec[10], char base32[16])
{
@@ -61,70 +60,4 @@ onion_base32_dec(unsigned char dec[10], char base32[16])
dec[c++] = base32_dec_single(base32[i+4]) << 7 | base32_dec_single(base32[i+5]) << 2 | base32_dec_single(base32[i+6]) >> 3;
dec[c++] = base32_dec_single(base32[i+7]) | base32_dec_single(base32[i+6]) << 5;
}
-
-}
-#ifdef __SSSE3__
-#include <tmmintrin.h>
-
-/* A slightly-parallel base32 algorithm using SSSE3
- * Note: This is not a general base32 algorithm; it outputs only the
- * first 16 base32 symbols of the input buffer, using only the first
- * 20 bytes of that buffer.
- *
- * Somewhat inspired by http://www.alfredklomp.com/programming/sse-base64/
- */
-void
-onion_base32_ssse3(char output[16], unsigned char sum[20]) {
- __m128i res;
- __m128i ssum;
- __m128i masklow5;
- __m128i lmask, l;
- __m128i nmask, n;
-
- ssum = _mm_loadu_si128((__m128i*)sum);
-
- /* FIXME seems a little hacky */
- masklow5 = _mm_set1_epi32(0x1F000000);
- masklow5 = _mm_slli_epi64(masklow5, 32);
-
- ssum = _mm_shuffle_epi8(ssum,
- _mm_setr_epi8(9,9,9,9,8,7,6,5,4,4,4,4,3,2,1,0 ));
-
- /* remember how I said "slightly parallel" ? */
- res = _mm_srli_epi64(ssum, 3) & masklow5;
- masklow5 = _mm_srli_epi64(masklow5, 8);
-
- res |= _mm_srli_epi64(ssum, 6) & masklow5;
- masklow5 = _mm_srli_epi64(masklow5, 8);
-
- res |= _mm_srli_epi64(ssum, 9) & masklow5;
- masklow5 = _mm_srli_epi64(masklow5, 8);
-
- res |= _mm_srli_epi64(ssum, 12) & masklow5;
- masklow5 = _mm_srli_epi64(masklow5, 8);
-
- res |= _mm_srli_epi64(ssum, 15) & masklow5;
- masklow5 = _mm_srli_epi64(masklow5, 8);
-
- res |= _mm_srli_epi64(ssum, 18) & masklow5;
- masklow5 = _mm_srli_epi64(masklow5, 8);
-
- res |= _mm_srli_epi64(ssum, 21) & masklow5;
- masklow5 = _mm_srli_epi64(masklow5, 8);
-
- res |= _mm_srli_epi64(ssum, 24) & masklow5;
- masklow5 = _mm_srli_epi64(masklow5, 8);
-
-
- res = _mm_shuffle_epi8(res,
- _mm_setr_epi8(15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0));
-
- lmask = _mm_cmplt_epi8(res, _mm_set1_epi8(26));
- nmask = _mm_andnot_si128(lmask, _mm_cmplt_epi8(res, _mm_set1_epi8(32)));
-
- l = lmask & _mm_add_epi8(res, _mm_set1_epi8('a'));
- n = nmask & _mm_add_epi8(res, _mm_set1_epi8('2' - 26));
-
- _mm_storeu_si128((__m128i*)output, l|n);
}
-#endif /* ifdef __SSSE3__ */
diff --git a/onion_base32.h b/onion_base32.h
index 23e7bd2..854c6f9 100644
--- a/onion_base32.h
+++ b/onion_base32.h
@@ -1,7 +1,3 @@
int check_base32(char *);
void onion_base32(char [16], unsigned char (*));
void onion_base32_dec(unsigned char [10], char[16]);
-
-#ifdef __SSSE3__
-void onion_base32_ssse3(char [16], unsigned char (*));
-#endif