diff options
Diffstat (limited to 'external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_stream/chacha20/ref/stream_chacha20_ref.c')
-rw-r--r-- | external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_stream/chacha20/ref/stream_chacha20_ref.c | 276 |
1 files changed, 0 insertions, 276 deletions
diff --git a/external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_stream/chacha20/ref/stream_chacha20_ref.c b/external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_stream/chacha20/ref/stream_chacha20_ref.c deleted file mode 100644 index 967015f2..00000000 --- a/external_libs/python/pyzmq-14.7.0/bundled/libsodium/src/libsodium/crypto_stream/chacha20/ref/stream_chacha20_ref.c +++ /dev/null @@ -1,276 +0,0 @@ - -/* $OpenBSD: chacha.c,v 1.1 2013/11/21 00:45:44 djm Exp $ */ - -/* - chacha-merged.c version 20080118 - D. J. Bernstein - Public domain. - */ - -#include <stdint.h> -#include <string.h> - -#include "api.h" -#include "crypto_stream_chacha20.h" -#include "utils.h" - -struct chacha_ctx { - uint32_t input[16]; -}; - -typedef uint8_t u8; -typedef uint32_t u32; - -typedef struct chacha_ctx chacha_ctx; - -#define U8C(v) (v##U) -#define U32C(v) (v##U) - -#define U8V(v) ((u8)(v) & U8C(0xFF)) -#define U32V(v) ((u32)(v) & U32C(0xFFFFFFFF)) - -#define ROTL32(v, n) \ - (U32V((v) << (n)) | ((v) >> (32 - (n)))) - -#define U8TO32_LITTLE(p) \ - (((u32)((p)[0]) ) | \ - ((u32)((p)[1]) << 8) | \ - ((u32)((p)[2]) << 16) | \ - ((u32)((p)[3]) << 24)) - -#define U32TO8_LITTLE(p, v) \ - do { \ - (p)[0] = U8V((v) ); \ - (p)[1] = U8V((v) >> 8); \ - (p)[2] = U8V((v) >> 16); \ - (p)[3] = U8V((v) >> 24); \ - } while (0) - -#define ROTATE(v,c) (ROTL32(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 unsigned char sigma[16] = { - 'e', 'x', 'p', 'a', 'n', 'd', ' ', '3', '2', '-', 'b', 'y', 't', 'e', ' ', 'k' -}; - -static void -chacha_keysetup(chacha_ctx *x, const u8 *k) -{ - const unsigned char *constants; - - x->input[4] = U8TO32_LITTLE(k + 0); - x->input[5] = U8TO32_LITTLE(k + 4); - x->input[6] = U8TO32_LITTLE(k + 8); - x->input[7] = U8TO32_LITTLE(k + 12); - k += 16; - constants = sigma; - x->input[8] = U8TO32_LITTLE(k + 0); - x->input[9] = U8TO32_LITTLE(k + 4); - x->input[10] = U8TO32_LITTLE(k + 8); - x->input[11] = U8TO32_LITTLE(k + 12); - x->input[0] = U8TO32_LITTLE(constants + 0); - x->input[1] = U8TO32_LITTLE(constants + 4); - x->input[2] = U8TO32_LITTLE(constants + 8); - x->input[3] = U8TO32_LITTLE(constants + 12); -} - -static void -chacha_ivsetup(chacha_ctx *x, const u8 *iv, const u8 *counter) -{ - x->input[12] = counter == NULL ? 0 : U8TO32_LITTLE(counter + 0); - x->input[13] = counter == NULL ? 0 : U8TO32_LITTLE(counter + 4); - x->input[14] = U8TO32_LITTLE(iv + 0); - x->input[15] = U8TO32_LITTLE(iv + 4); -} - -static void -chacha_encrypt_bytes(chacha_ctx *x, const u8 *m, u8 *c, unsigned long long bytes) -{ - u32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15; - u32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15; - u8 *ctarget = NULL; - u8 tmp[64]; - unsigned int i; - - if (!bytes) { - return; /* LCOV_EXCL_LINE */ - } - j0 = x->input[0]; - j1 = x->input[1]; - j2 = x->input[2]; - j3 = x->input[3]; - j4 = x->input[4]; - j5 = x->input[5]; - j6 = x->input[6]; - j7 = x->input[7]; - j8 = x->input[8]; - j9 = x->input[9]; - j10 = x->input[10]; - j11 = x->input[11]; - j12 = x->input[12]; - j13 = x->input[13]; - j14 = x->input[14]; - j15 = x->input[15]; - - for (;;) { - if (bytes < 64) { - for (i = 0; i < bytes; ++i) { - tmp[i] = m[i]; - } - m = tmp; - ctarget = c; - c = 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 = 20; 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(m + 0)); - x1 = XOR(x1, U8TO32_LITTLE(m + 4)); - x2 = XOR(x2, U8TO32_LITTLE(m + 8)); - x3 = XOR(x3, U8TO32_LITTLE(m + 12)); - x4 = XOR(x4, U8TO32_LITTLE(m + 16)); - x5 = XOR(x5, U8TO32_LITTLE(m + 20)); - x6 = XOR(x6, U8TO32_LITTLE(m + 24)); - x7 = XOR(x7, U8TO32_LITTLE(m + 28)); - x8 = XOR(x8, U8TO32_LITTLE(m + 32)); - x9 = XOR(x9, U8TO32_LITTLE(m + 36)); - x10 = XOR(x10, U8TO32_LITTLE(m + 40)); - x11 = XOR(x11, U8TO32_LITTLE(m + 44)); - x12 = XOR(x12, U8TO32_LITTLE(m + 48)); - x13 = XOR(x13, U8TO32_LITTLE(m + 52)); - x14 = XOR(x14, U8TO32_LITTLE(m + 56)); - x15 = XOR(x15, U8TO32_LITTLE(m + 60)); - - j12 = PLUSONE(j12); - /* LCOV_EXCL_START */ - if (!j12) { - j13 = PLUSONE(j13); - } - /* LCOV_EXCL_STOP */ - - U32TO8_LITTLE(c + 0, x0); - U32TO8_LITTLE(c + 4, x1); - U32TO8_LITTLE(c + 8, x2); - U32TO8_LITTLE(c + 12, x3); - U32TO8_LITTLE(c + 16, x4); - U32TO8_LITTLE(c + 20, x5); - U32TO8_LITTLE(c + 24, x6); - U32TO8_LITTLE(c + 28, x7); - U32TO8_LITTLE(c + 32, x8); - U32TO8_LITTLE(c + 36, x9); - U32TO8_LITTLE(c + 40, x10); - U32TO8_LITTLE(c + 44, x11); - U32TO8_LITTLE(c + 48, x12); - U32TO8_LITTLE(c + 52, x13); - U32TO8_LITTLE(c + 56, x14); - U32TO8_LITTLE(c + 60, x15); - - if (bytes <= 64) { - if (bytes < 64) { - for (i = 0; i < (unsigned int) bytes; ++i) { - ctarget[i] = c[i]; - } - } - x->input[12] = j12; - x->input[13] = j13; - return; - } - bytes -= 64; - c += 64; - m += 64; - } -} - -int -crypto_stream_chacha20_ref(unsigned char *c, unsigned long long clen, - const unsigned char *n, const unsigned char *k) -{ - struct chacha_ctx ctx; - - if (!clen) { - return 0; - } - (void) sizeof(int[crypto_stream_chacha20_KEYBYTES == 256 / 8 ? 1 : -1]); - chacha_keysetup(&ctx, k); - chacha_ivsetup(&ctx, n, NULL); - memset(c, 0, clen); - chacha_encrypt_bytes(&ctx, c, c, clen); - sodium_memzero(&ctx, sizeof ctx); - - return 0; -} - -int -crypto_stream_chacha20_ref_xor_ic(unsigned char *c, const unsigned char *m, - unsigned long long mlen, - const unsigned char *n, uint64_t ic, - const unsigned char *k) -{ - struct chacha_ctx ctx; - uint8_t ic_bytes[8]; - uint32_t ic_high; - uint32_t ic_low; - - if (!mlen) { - return 0; - } - ic_high = U32V(ic >> 32); - ic_low = U32V(ic); - U32TO8_LITTLE(&ic_bytes[0], ic_low); - U32TO8_LITTLE(&ic_bytes[4], ic_high); - chacha_keysetup(&ctx, k); - chacha_ivsetup(&ctx, n, ic_bytes); - chacha_encrypt_bytes(&ctx, m, c, mlen); - sodium_memzero(&ctx, sizeof ctx); - sodium_memzero(ic_bytes, sizeof ic_bytes); - - return 0; -} |