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Diffstat (limited to 'src/crypto/chacha8.c')
| -rw-r--r-- | src/crypto/chacha8.c | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/src/crypto/chacha8.c b/src/crypto/chacha8.c deleted file mode 100644 index df135af59..000000000 --- a/src/crypto/chacha8.c +++ /dev/null @@ -1,170 +0,0 @@ -/* -chacha-merged.c version 20080118 -D. J. Bernstein -Public domain. -*/ - -#include <memory.h> -#include <stdio.h> -#include <sys/param.h> - -#include "chacha8.h" -#include "common/int-util.h" -#include "warnings.h" - -/* - * The following macros are used to obtain exact-width results. - */ -#define U8V(v) ((uint8_t)(v) & UINT8_C(0xFF)) -#define U32V(v) ((uint32_t)(v) & UINT32_C(0xFFFFFFFF)) - -/* - * The following macros load words from an array of bytes with - * different types of endianness, and vice versa. - */ -#define U8TO32_LITTLE(p) SWAP32LE(((uint32_t*)(p))[0]) -#define U32TO8_LITTLE(p, v) (((uint32_t*)(p))[0] = SWAP32LE(v)) - -#define ROTATE(v,c) (rol32(v,c)) -#define XOR(v,w) ((v) ^ (w)) -#define PLUS(v,w) (U32V((v) + (w))) -#define PLUSONE(v) (PLUS((v),1)) - -#define QUARTERROUND(a,b,c,d) \ - a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \ - c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \ - a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \ - c = PLUS(c,d); b = ROTATE(XOR(b,c), 7); - -static const char sigma[] = "expand 32-byte k"; - -DISABLE_GCC_AND_CLANG_WARNING(strict-aliasing) - -void chacha8(const void* data, size_t length, const uint8_t* key, const uint8_t* iv, char* cipher) { - uint32_t x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15; - uint32_t j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15; - char* ctarget = 0; - char tmp[64]; - int i; - - if (!length) return; - - j0 = U8TO32_LITTLE(sigma + 0); - j1 = U8TO32_LITTLE(sigma + 4); - j2 = U8TO32_LITTLE(sigma + 8); - j3 = U8TO32_LITTLE(sigma + 12); - j4 = U8TO32_LITTLE(key + 0); - j5 = U8TO32_LITTLE(key + 4); - j6 = U8TO32_LITTLE(key + 8); - j7 = U8TO32_LITTLE(key + 12); - j8 = U8TO32_LITTLE(key + 16); - j9 = U8TO32_LITTLE(key + 20); - j10 = U8TO32_LITTLE(key + 24); - j11 = U8TO32_LITTLE(key + 28); - j12 = 0; - j13 = 0; - j14 = U8TO32_LITTLE(iv + 0); - j15 = U8TO32_LITTLE(iv + 4); - - for (;;) { - if (length < 64) { - memcpy(tmp, data, length); - data = tmp; - ctarget = cipher; - cipher = tmp; - } - x0 = j0; - x1 = j1; - x2 = j2; - x3 = j3; - x4 = j4; - x5 = j5; - x6 = j6; - x7 = j7; - x8 = j8; - x9 = j9; - x10 = j10; - x11 = j11; - x12 = j12; - x13 = j13; - x14 = j14; - x15 = j15; - for (i = 8;i > 0;i -= 2) { - QUARTERROUND( x0, x4, x8,x12) - QUARTERROUND( x1, x5, x9,x13) - QUARTERROUND( x2, x6,x10,x14) - QUARTERROUND( x3, x7,x11,x15) - QUARTERROUND( x0, x5,x10,x15) - QUARTERROUND( x1, x6,x11,x12) - QUARTERROUND( x2, x7, x8,x13) - QUARTERROUND( x3, x4, x9,x14) - } - x0 = PLUS( x0, j0); - x1 = PLUS( x1, j1); - x2 = PLUS( x2, j2); - x3 = PLUS( x3, j3); - x4 = PLUS( x4, j4); - x5 = PLUS( x5, j5); - x6 = PLUS( x6, j6); - x7 = PLUS( x7, j7); - x8 = PLUS( x8, j8); - x9 = PLUS( x9, j9); - x10 = PLUS(x10,j10); - x11 = PLUS(x11,j11); - x12 = PLUS(x12,j12); - x13 = PLUS(x13,j13); - x14 = PLUS(x14,j14); - x15 = PLUS(x15,j15); - - x0 = XOR( x0,U8TO32_LITTLE((uint8_t*)data + 0)); - x1 = XOR( x1,U8TO32_LITTLE((uint8_t*)data + 4)); - x2 = XOR( x2,U8TO32_LITTLE((uint8_t*)data + 8)); - x3 = XOR( x3,U8TO32_LITTLE((uint8_t*)data + 12)); - x4 = XOR( x4,U8TO32_LITTLE((uint8_t*)data + 16)); - x5 = XOR( x5,U8TO32_LITTLE((uint8_t*)data + 20)); - x6 = XOR( x6,U8TO32_LITTLE((uint8_t*)data + 24)); - x7 = XOR( x7,U8TO32_LITTLE((uint8_t*)data + 28)); - x8 = XOR( x8,U8TO32_LITTLE((uint8_t*)data + 32)); - x9 = XOR( x9,U8TO32_LITTLE((uint8_t*)data + 36)); - x10 = XOR(x10,U8TO32_LITTLE((uint8_t*)data + 40)); - x11 = XOR(x11,U8TO32_LITTLE((uint8_t*)data + 44)); - x12 = XOR(x12,U8TO32_LITTLE((uint8_t*)data + 48)); - x13 = XOR(x13,U8TO32_LITTLE((uint8_t*)data + 52)); - x14 = XOR(x14,U8TO32_LITTLE((uint8_t*)data + 56)); - x15 = XOR(x15,U8TO32_LITTLE((uint8_t*)data + 60)); - - j12 = PLUSONE(j12); - if (!j12) - { - j13 = PLUSONE(j13); - /* stopping at 2^70 bytes per iv is user's responsibility */ - } - - U32TO8_LITTLE(cipher + 0,x0); - U32TO8_LITTLE(cipher + 4,x1); - U32TO8_LITTLE(cipher + 8,x2); - U32TO8_LITTLE(cipher + 12,x3); - U32TO8_LITTLE(cipher + 16,x4); - U32TO8_LITTLE(cipher + 20,x5); - U32TO8_LITTLE(cipher + 24,x6); - U32TO8_LITTLE(cipher + 28,x7); - U32TO8_LITTLE(cipher + 32,x8); - U32TO8_LITTLE(cipher + 36,x9); - U32TO8_LITTLE(cipher + 40,x10); - U32TO8_LITTLE(cipher + 44,x11); - U32TO8_LITTLE(cipher + 48,x12); - U32TO8_LITTLE(cipher + 52,x13); - U32TO8_LITTLE(cipher + 56,x14); - U32TO8_LITTLE(cipher + 60,x15); - - if (length <= 64) { - if (length < 64) { - memcpy(ctarget, cipher, length); - } - return; - } - length -= 64; - cipher += 64; - data = (uint8_t*)data + 64; - } -} |