mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-15 12:13:24 +00:00
328 lines
7.7 KiB
C
328 lines
7.7 KiB
C
|
|
||
|
/*
|
||
|
chacha-merged.c version 20080118
|
||
|
D. J. Bernstein
|
||
|
Public domain.
|
||
|
*/
|
||
|
|
||
|
#include <stdint.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
|
||
|
#include <sodium/core.h>
|
||
|
#include <sodium/crypto_stream_chacha20.h>
|
||
|
#include <sodium/private/common.h>
|
||
|
#include <sodium/utils.h>
|
||
|
|
||
|
#include "../stream_chacha20.h"
|
||
|
#include "chacha20_ref.h"
|
||
|
|
||
|
struct chacha_ctx
|
||
|
{
|
||
|
uint32_t input[16];
|
||
|
};
|
||
|
|
||
|
typedef struct chacha_ctx chacha_ctx;
|
||
|
|
||
|
#define U32C(v) (v##U)
|
||
|
|
||
|
#define U32V(v) ((uint32_t)(v)&U32C(0xFFFFFFFF))
|
||
|
|
||
|
#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 void
|
||
|
chacha_keysetup(chacha_ctx *ctx, const uint8_t *k)
|
||
|
{
|
||
|
ctx->input[0] = U32C(0x61707865);
|
||
|
ctx->input[1] = U32C(0x3320646e);
|
||
|
ctx->input[2] = U32C(0x79622d32);
|
||
|
ctx->input[3] = U32C(0x6b206574);
|
||
|
ctx->input[4] = LOAD32_LE(k + 0);
|
||
|
ctx->input[5] = LOAD32_LE(k + 4);
|
||
|
ctx->input[6] = LOAD32_LE(k + 8);
|
||
|
ctx->input[7] = LOAD32_LE(k + 12);
|
||
|
ctx->input[8] = LOAD32_LE(k + 16);
|
||
|
ctx->input[9] = LOAD32_LE(k + 20);
|
||
|
ctx->input[10] = LOAD32_LE(k + 24);
|
||
|
ctx->input[11] = LOAD32_LE(k + 28);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
chacha_ivsetup(chacha_ctx *ctx, const uint8_t *iv, const uint8_t *counter)
|
||
|
{
|
||
|
ctx->input[12] = counter == NULL ? 0 : LOAD32_LE(counter + 0);
|
||
|
ctx->input[13] = counter == NULL ? 0 : LOAD32_LE(counter + 4);
|
||
|
ctx->input[14] = LOAD32_LE(iv + 0);
|
||
|
ctx->input[15] = LOAD32_LE(iv + 4);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
chacha_ietf_ivsetup(chacha_ctx *ctx, const uint8_t *iv, const uint8_t *counter)
|
||
|
{
|
||
|
ctx->input[12] = counter == NULL ? 0 : LOAD32_LE(counter);
|
||
|
ctx->input[13] = LOAD32_LE(iv + 0);
|
||
|
ctx->input[14] = LOAD32_LE(iv + 4);
|
||
|
ctx->input[15] = LOAD32_LE(iv + 8);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
chacha20_encrypt_bytes(chacha_ctx *ctx, const uint8_t *m, uint8_t *c,
|
||
|
unsigned long long bytes)
|
||
|
{
|
||
|
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;
|
||
|
uint8_t *ctarget = NULL;
|
||
|
uint8_t tmp[64];
|
||
|
unsigned int i;
|
||
|
|
||
|
if(!bytes)
|
||
|
{
|
||
|
return; /* LCOV_EXCL_LINE */
|
||
|
}
|
||
|
if(bytes > crypto_stream_chacha20_MESSAGEBYTES_MAX)
|
||
|
{
|
||
|
sodium_misuse();
|
||
|
}
|
||
|
j0 = ctx->input[0];
|
||
|
j1 = ctx->input[1];
|
||
|
j2 = ctx->input[2];
|
||
|
j3 = ctx->input[3];
|
||
|
j4 = ctx->input[4];
|
||
|
j5 = ctx->input[5];
|
||
|
j6 = ctx->input[6];
|
||
|
j7 = ctx->input[7];
|
||
|
j8 = ctx->input[8];
|
||
|
j9 = ctx->input[9];
|
||
|
j10 = ctx->input[10];
|
||
|
j11 = ctx->input[11];
|
||
|
j12 = ctx->input[12];
|
||
|
j13 = ctx->input[13];
|
||
|
j14 = ctx->input[14];
|
||
|
j15 = ctx->input[15];
|
||
|
|
||
|
for(;;)
|
||
|
{
|
||
|
if(bytes < 64)
|
||
|
{
|
||
|
memset(tmp, 0, 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, LOAD32_LE(m + 0));
|
||
|
x1 = XOR(x1, LOAD32_LE(m + 4));
|
||
|
x2 = XOR(x2, LOAD32_LE(m + 8));
|
||
|
x3 = XOR(x3, LOAD32_LE(m + 12));
|
||
|
x4 = XOR(x4, LOAD32_LE(m + 16));
|
||
|
x5 = XOR(x5, LOAD32_LE(m + 20));
|
||
|
x6 = XOR(x6, LOAD32_LE(m + 24));
|
||
|
x7 = XOR(x7, LOAD32_LE(m + 28));
|
||
|
x8 = XOR(x8, LOAD32_LE(m + 32));
|
||
|
x9 = XOR(x9, LOAD32_LE(m + 36));
|
||
|
x10 = XOR(x10, LOAD32_LE(m + 40));
|
||
|
x11 = XOR(x11, LOAD32_LE(m + 44));
|
||
|
x12 = XOR(x12, LOAD32_LE(m + 48));
|
||
|
x13 = XOR(x13, LOAD32_LE(m + 52));
|
||
|
x14 = XOR(x14, LOAD32_LE(m + 56));
|
||
|
x15 = XOR(x15, LOAD32_LE(m + 60));
|
||
|
|
||
|
j12 = PLUSONE(j12);
|
||
|
/* LCOV_EXCL_START */
|
||
|
if(!j12)
|
||
|
{
|
||
|
j13 = PLUSONE(j13);
|
||
|
}
|
||
|
/* LCOV_EXCL_STOP */
|
||
|
|
||
|
STORE32_LE(c + 0, x0);
|
||
|
STORE32_LE(c + 4, x1);
|
||
|
STORE32_LE(c + 8, x2);
|
||
|
STORE32_LE(c + 12, x3);
|
||
|
STORE32_LE(c + 16, x4);
|
||
|
STORE32_LE(c + 20, x5);
|
||
|
STORE32_LE(c + 24, x6);
|
||
|
STORE32_LE(c + 28, x7);
|
||
|
STORE32_LE(c + 32, x8);
|
||
|
STORE32_LE(c + 36, x9);
|
||
|
STORE32_LE(c + 40, x10);
|
||
|
STORE32_LE(c + 44, x11);
|
||
|
STORE32_LE(c + 48, x12);
|
||
|
STORE32_LE(c + 52, x13);
|
||
|
STORE32_LE(c + 56, x14);
|
||
|
STORE32_LE(c + 60, x15);
|
||
|
|
||
|
if(bytes <= 64)
|
||
|
{
|
||
|
if(bytes < 64)
|
||
|
{
|
||
|
for(i = 0; i < (unsigned int)bytes; ++i)
|
||
|
{
|
||
|
ctarget[i] = c[i]; /* ctarget cannot be NULL */
|
||
|
}
|
||
|
}
|
||
|
ctx->input[12] = j12;
|
||
|
ctx->input[13] = j13;
|
||
|
|
||
|
return;
|
||
|
}
|
||
|
bytes -= 64;
|
||
|
c += 64;
|
||
|
m += 64;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
stream_ref(unsigned char *c, unsigned long long clen, const unsigned char *n,
|
||
|
const unsigned char *k)
|
||
|
{
|
||
|
struct chacha_ctx ctx;
|
||
|
|
||
|
if(!clen)
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
COMPILER_ASSERT(crypto_stream_chacha20_KEYBYTES == 256 / 8);
|
||
|
chacha_keysetup(&ctx, k);
|
||
|
chacha_ivsetup(&ctx, n, NULL);
|
||
|
memset(c, 0, clen);
|
||
|
chacha20_encrypt_bytes(&ctx, c, c, clen);
|
||
|
sodium_memzero(&ctx, sizeof ctx);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
stream_ietf_ref(unsigned char *c, unsigned long long clen,
|
||
|
const unsigned char *n, const unsigned char *k)
|
||
|
{
|
||
|
struct chacha_ctx ctx;
|
||
|
|
||
|
if(!clen)
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
COMPILER_ASSERT(crypto_stream_chacha20_KEYBYTES == 256 / 8);
|
||
|
chacha_keysetup(&ctx, k);
|
||
|
chacha_ietf_ivsetup(&ctx, n, NULL);
|
||
|
memset(c, 0, clen);
|
||
|
chacha20_encrypt_bytes(&ctx, c, c, clen);
|
||
|
sodium_memzero(&ctx, sizeof ctx);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
stream_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);
|
||
|
STORE32_LE(&ic_bytes[0], ic_low);
|
||
|
STORE32_LE(&ic_bytes[4], ic_high);
|
||
|
chacha_keysetup(&ctx, k);
|
||
|
chacha_ivsetup(&ctx, n, ic_bytes);
|
||
|
chacha20_encrypt_bytes(&ctx, m, c, mlen);
|
||
|
sodium_memzero(&ctx, sizeof ctx);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
stream_ietf_ref_xor_ic(unsigned char *c, const unsigned char *m,
|
||
|
unsigned long long mlen, const unsigned char *n,
|
||
|
uint32_t ic, const unsigned char *k)
|
||
|
{
|
||
|
struct chacha_ctx ctx;
|
||
|
uint8_t ic_bytes[4];
|
||
|
|
||
|
if(!mlen)
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
STORE32_LE(ic_bytes, ic);
|
||
|
chacha_keysetup(&ctx, k);
|
||
|
chacha_ietf_ivsetup(&ctx, n, ic_bytes);
|
||
|
chacha20_encrypt_bytes(&ctx, m, c, mlen);
|
||
|
sodium_memzero(&ctx, sizeof ctx);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
struct crypto_stream_chacha20_implementation
|
||
|
crypto_stream_chacha20_ref_implementation = {
|
||
|
SODIUM_C99(.stream =) stream_ref,
|
||
|
SODIUM_C99(.stream_ietf =) stream_ietf_ref,
|
||
|
SODIUM_C99(.stream_xor_ic =) stream_ref_xor_ic,
|
||
|
SODIUM_C99(.stream_ietf_xor_ic =) stream_ietf_ref_xor_ic};
|