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Diffstat (limited to 'src/crypto/siphash.c')
| -rw-r--r-- | src/crypto/siphash.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/src/crypto/siphash.c b/src/crypto/siphash.c deleted file mode 100644 index 86ff070..0000000 --- a/src/crypto/siphash.c +++ /dev/null @@ -1,204 +0,0 @@ -/* Copyright (C) 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. - * - * SipHash: a fast short-input PRF - * https://131002.net/siphash/ - * - * This implementation is specifically for SipHash2-4. - */ - -#include "siphash.h" -#include <asm/unaligned.h> - -#if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64 -#include <linux/dcache.h> -#include <asm/word-at-a-time.h> -#endif - -#define SIPROUND \ - do { \ - v0 += v1; v1 = rol64(v1, 13); v1 ^= v0; v0 = rol64(v0, 32); \ - v2 += v3; v3 = rol64(v3, 16); v3 ^= v2; \ - v0 += v3; v3 = rol64(v3, 21); v3 ^= v0; \ - v2 += v1; v1 = rol64(v1, 17); v1 ^= v2; v2 = rol64(v2, 32); \ - } while(0) - -#define PREAMBLE(len) \ - u64 v0 = 0x736f6d6570736575ULL; \ - u64 v1 = 0x646f72616e646f6dULL; \ - u64 v2 = 0x6c7967656e657261ULL; \ - u64 v3 = 0x7465646279746573ULL; \ - u64 b = ((u64)len) << 56; \ - v3 ^= key[1]; \ - v2 ^= key[0]; \ - v1 ^= key[1]; \ - v0 ^= key[0]; - -#define POSTAMBLE \ - v3 ^= b; \ - SIPROUND; \ - SIPROUND; \ - v0 ^= b; \ - v2 ^= 0xff; \ - SIPROUND; \ - SIPROUND; \ - SIPROUND; \ - SIPROUND; \ - return (v0 ^ v1) ^ (v2 ^ v3); - -u64 __siphash_aligned(const void *data, size_t len, const siphash_key_t key) -{ - const u8 *end = data + len - (len % sizeof(u64)); - const u8 left = len & (sizeof(u64) - 1); - u64 m; - PREAMBLE(len) - for (; data != end; data += sizeof(u64)) { - m = le64_to_cpup(data); - v3 ^= m; - SIPROUND; - SIPROUND; - v0 ^= m; - } -#if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64 - if (left) - b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) & - bytemask_from_count(left))); -#else - switch (left) { - case 7: b |= ((u64)end[6]) << 48; - case 6: b |= ((u64)end[5]) << 40; - case 5: b |= ((u64)end[4]) << 32; - case 4: b |= le32_to_cpup(data); break; - case 3: b |= ((u64)end[2]) << 16; - case 2: b |= le16_to_cpup(data); break; - case 1: b |= end[0]; - } -#endif - POSTAMBLE -} - -#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS -u64 __siphash_unaligned(const void *data, size_t len, const siphash_key_t key) -{ - const u8 *end = data + len - (len % sizeof(u64)); - const u8 left = len & (sizeof(u64) - 1); - u64 m; - PREAMBLE(len) - for (; data != end; data += sizeof(u64)) { - m = get_unaligned_le64(data); - v3 ^= m; - SIPROUND; - SIPROUND; - v0 ^= m; - } -#if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64 - if (left) - b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) & - bytemask_from_count(left))); -#else - switch (left) { - case 7: b |= ((u64)end[6]) << 48; - case 6: b |= ((u64)end[5]) << 40; - case 5: b |= ((u64)end[4]) << 32; - case 4: b |= get_unaligned_le32(end); break; - case 3: b |= ((u64)end[2]) << 16; - case 2: b |= get_unaligned_le16(end); break; - case 1: b |= end[0]; - } -#endif - POSTAMBLE -} -#endif - -/** - * siphash_1u64 - compute 64-bit siphash PRF value of a u64 - * @first: first u64 - * @key: the siphash key - */ -u64 siphash_1u64(const u64 first, const siphash_key_t key) -{ - PREAMBLE(8) - v3 ^= first; - SIPROUND; - SIPROUND; - v0 ^= first; - POSTAMBLE -} - -/** - * siphash_2u64 - compute 64-bit siphash PRF value of 2 u64 - * @first: first u64 - * @second: second u64 - * @key: the siphash key - */ -u64 siphash_2u64(const u64 first, const u64 second, const siphash_key_t key) -{ - PREAMBLE(16) - v3 ^= first; - SIPROUND; - SIPROUND; - v0 ^= first; - v3 ^= second; - SIPROUND; - SIPROUND; - v0 ^= second; - POSTAMBLE -} - -/** - * siphash_3u64 - compute 64-bit siphash PRF value of 3 u64 - * @first: first u64 - * @second: second u64 - * @third: third u64 - * @key: the siphash key - */ -u64 siphash_3u64(const u64 first, const u64 second, const u64 third, - const siphash_key_t key) -{ - PREAMBLE(24) - v3 ^= first; - SIPROUND; - SIPROUND; - v0 ^= first; - v3 ^= second; - SIPROUND; - SIPROUND; - v0 ^= second; - v3 ^= third; - SIPROUND; - SIPROUND; - v0 ^= third; - POSTAMBLE -} - -/** - * siphash_4u64 - compute 64-bit siphash PRF value of 4 u64 - * @first: first u64 - * @second: second u64 - * @third: third u64 - * @forth: forth u64 - * @key: the siphash key - */ -u64 siphash_4u64(const u64 first, const u64 second, const u64 third, - const u64 forth, const siphash_key_t key) -{ - PREAMBLE(32) - v3 ^= first; - SIPROUND; - SIPROUND; - v0 ^= first; - v3 ^= second; - SIPROUND; - SIPROUND; - v0 ^= second; - v3 ^= third; - SIPROUND; - SIPROUND; - v0 ^= third; - v3 ^= forth; - SIPROUND; - SIPROUND; - v0 ^= forth; - POSTAMBLE -} - -#include "../selftest/siphash.h" |