mirror of
https://github.com/apache/incubator-nuttx.git
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337 lines
8.3 KiB
C
337 lines
8.3 KiB
C
/****************************************************************************
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* crypto/chacha_private.h
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* $OpenBSD: chacha_private.h,v 1.4 2020/07/22 13:54:30 tobhe Exp $
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*
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* chacha-merged.c version 20080118
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* D. J. Bernstein
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* Public domain.
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <string.h>
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#include <sys/types.h>
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typedef struct
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{
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uint32_t input[16]; /* could be compressed */
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}
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chacha_ctx;
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#define U8C(v) (v##U)
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#define U32C(v) (v##U)
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#define U8V(v) ((uint8_t)(v) & U8C(0xFF))
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#define U32V(v) ((uint32_t)(v) & U32C(0xFFFFFFFF))
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#define ROTL32(v, n) \
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(U32V((v) << (n)) | ((v) >> (32 - (n))))
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#define U8TO32_LITTLE(p) \
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(((uint32_t)((p)[0])) | \
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((uint32_t)((p)[1]) << 8) | \
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((uint32_t)((p)[2]) << 16) | \
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((uint32_t)((p)[3]) << 24)) \
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#define U32TO8_LITTLE(p, v) \
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do { \
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(p)[0] = U8V((v)); \
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(p)[1] = U8V((v) >> 8); \
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(p)[2] = U8V((v) >> 16); \
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(p)[3] = U8V((v) >> 24); \
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} while (0)
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#define ROTATE(v, c) (ROTL32(v, c))
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#define XOR(v, w) ((v) ^ (w))
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#define PLUS(v, w) (U32V((v) + (w)))
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#define PLUSONE(v) (PLUS((v), 1))
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#define QUARTERROUND(a, b, c, d) \
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do \
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{ \
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a = PLUS(a, b); d = ROTATE(XOR(d, a), 16); \
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c = PLUS(c, d); b = ROTATE(XOR(b, c), 12); \
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a = PLUS(a, b); d = ROTATE(XOR(d, a), 8); \
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c = PLUS(c, d); b = ROTATE(XOR(b, c), 7); \
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} \
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while (0)
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static const char sigma[16] = "expand 32-byte k";
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static const char tau[16] = "expand 16-byte k";
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static inline void hchacha20(FAR uint32_t *derived_key,
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FAR const uint8_t *nonce,
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FAR const uint8_t *key)
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{
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int i;
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uint32_t x[] =
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{
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U8TO32_LITTLE(sigma + 0),
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U8TO32_LITTLE(sigma + 4),
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U8TO32_LITTLE(sigma + 8),
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U8TO32_LITTLE(sigma + 12),
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U8TO32_LITTLE(key + 0),
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U8TO32_LITTLE(key + 4),
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U8TO32_LITTLE(key + 8),
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U8TO32_LITTLE(key + 12),
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U8TO32_LITTLE(key + 16),
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U8TO32_LITTLE(key + 20),
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U8TO32_LITTLE(key + 24),
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U8TO32_LITTLE(key + 28),
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U8TO32_LITTLE(nonce + 0),
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U8TO32_LITTLE(nonce + 4),
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U8TO32_LITTLE(nonce + 8),
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U8TO32_LITTLE(nonce + 12)
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};
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for (i = 20; i > 0; i -= 2)
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{
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QUARTERROUND(x[0], x[4], x[8], x[12]);
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QUARTERROUND(x[1], x[5], x[9], x[13]);
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QUARTERROUND(x[2], x[6], x[10], x[14]);
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QUARTERROUND(x[3], x[7], x[11], x[15]);
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QUARTERROUND(x[0], x[5], x[10], x[15]);
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QUARTERROUND(x[1], x[6], x[11], x[12]);
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QUARTERROUND(x[2], x[7], x[8], x[13]);
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QUARTERROUND(x[3], x[4], x[9], x[14]);
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}
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memcpy(derived_key + 0, x + 0, sizeof(uint32_t) * 4);
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memcpy(derived_key + 4, x + 12, sizeof(uint32_t) * 4);
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}
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static void chacha_keysetup(FAR chacha_ctx *x,
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FAR const uint8_t *k,
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FAR uint32_t kbits)
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{
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FAR const char *constants;
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x->input[4] = U8TO32_LITTLE(k + 0);
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x->input[5] = U8TO32_LITTLE(k + 4);
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x->input[6] = U8TO32_LITTLE(k + 8);
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x->input[7] = U8TO32_LITTLE(k + 12);
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if (kbits == 256)
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{
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/* recommended */
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k += 16;
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constants = sigma;
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}
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else
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{
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/* kbits == 128 */
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constants = tau;
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}
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x->input[8] = U8TO32_LITTLE(k + 0);
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x->input[9] = U8TO32_LITTLE(k + 4);
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x->input[10] = U8TO32_LITTLE(k + 8);
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x->input[11] = U8TO32_LITTLE(k + 12);
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x->input[0] = U8TO32_LITTLE(constants + 0);
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x->input[1] = U8TO32_LITTLE(constants + 4);
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x->input[2] = U8TO32_LITTLE(constants + 8);
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x->input[3] = U8TO32_LITTLE(constants + 12);
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}
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static void chacha_ivsetup(FAR chacha_ctx *x,
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FAR const uint8_t *iv,
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FAR const uint8_t *counter)
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{
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x->input[12] = counter == NULL ? 0 : U8TO32_LITTLE(counter + 0);
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x->input[13] = counter == NULL ? 0 : U8TO32_LITTLE(counter + 4);
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x->input[14] = U8TO32_LITTLE(iv + 0);
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x->input[15] = U8TO32_LITTLE(iv + 4);
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}
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static void chacha_encrypt_bytes(FAR chacha_ctx *x,
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FAR const uint8_t *m,
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FAR uint8_t *c,
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uint32_t bytes)
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{
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uint32_t x0;
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uint32_t x1;
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uint32_t x2;
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uint32_t x3;
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uint32_t x4;
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uint32_t x5;
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uint32_t x6;
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uint32_t x7;
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uint32_t x8;
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uint32_t x9;
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uint32_t x10;
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uint32_t x11;
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uint32_t x12;
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uint32_t x13;
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uint32_t x14;
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uint32_t x15;
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uint32_t j0;
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uint32_t j1;
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uint32_t j2;
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uint32_t j3;
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uint32_t j4;
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uint32_t j5;
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uint32_t j6;
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uint32_t j7;
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uint32_t j8;
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uint32_t j9;
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uint32_t j10;
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uint32_t j11;
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uint32_t j12;
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uint32_t j13;
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uint32_t j14;
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uint32_t j15;
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FAR uint8_t *ctarget = NULL;
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uint8_t tmp[64];
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u_int i;
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if (!bytes)
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{
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return;
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}
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j0 = x->input[0];
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j1 = x->input[1];
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j2 = x->input[2];
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j3 = x->input[3];
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j4 = x->input[4];
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j5 = x->input[5];
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j6 = x->input[6];
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j7 = x->input[7];
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j8 = x->input[8];
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j9 = x->input[9];
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j10 = x->input[10];
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j11 = x->input[11];
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j12 = x->input[12];
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j13 = x->input[13];
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j14 = x->input[14];
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j15 = x->input[15];
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for (; ; )
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{
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if (bytes < 64)
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{
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for (i = 0; i < bytes; ++i)
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{
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tmp[i] = m[i];
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}
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m = tmp;
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ctarget = c;
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c = tmp;
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}
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x0 = j0;
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x1 = j1;
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x2 = j2;
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x3 = j3;
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x4 = j4;
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x5 = j5;
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x6 = j6;
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x7 = j7;
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x8 = j8;
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x9 = j9;
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x10 = j10;
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x11 = j11;
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x12 = j12;
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x13 = j13;
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x14 = j14;
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x15 = j15;
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for (i = 20; i > 0; i -= 2)
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{
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QUARTERROUND(x0, x4, x8, x12);
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QUARTERROUND(x1, x5, x9, x13);
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QUARTERROUND(x2, x6, x10, x14);
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QUARTERROUND(x3, x7, x11, x15);
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QUARTERROUND(x0, x5, x10, x15);
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QUARTERROUND(x1, x6, x11, x12);
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QUARTERROUND(x2, x7, x8, x13);
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QUARTERROUND(x3, x4, x9, x14);
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}
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x0 = PLUS(x0, j0);
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x1 = PLUS(x1, j1);
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x2 = PLUS(x2, j2);
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x3 = PLUS(x3, j3);
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x4 = PLUS(x4, j4);
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x5 = PLUS(x5, j5);
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x6 = PLUS(x6, j6);
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x7 = PLUS(x7, j7);
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x8 = PLUS(x8, j8);
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x9 = PLUS(x9, j9);
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x10 = PLUS(x10, j10);
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x11 = PLUS(x11, j11);
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x12 = PLUS(x12, j12);
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x13 = PLUS(x13, j13);
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x14 = PLUS(x14, j14);
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x15 = PLUS(x15, j15);
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#ifndef KEYSTREAM_ONLY
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x0 = XOR(x0, U8TO32_LITTLE(m + 0));
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x1 = XOR(x1, U8TO32_LITTLE(m + 4));
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x2 = XOR(x2, U8TO32_LITTLE(m + 8));
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x3 = XOR(x3, U8TO32_LITTLE(m + 12));
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x4 = XOR(x4, U8TO32_LITTLE(m + 16));
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x5 = XOR(x5, U8TO32_LITTLE(m + 20));
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x6 = XOR(x6, U8TO32_LITTLE(m + 24));
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x7 = XOR(x7, U8TO32_LITTLE(m + 28));
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x8 = XOR(x8, U8TO32_LITTLE(m + 32));
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x9 = XOR(x9, U8TO32_LITTLE(m + 36));
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x10 = XOR(x10, U8TO32_LITTLE(m + 40));
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x11 = XOR(x11, U8TO32_LITTLE(m + 44));
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x12 = XOR(x12, U8TO32_LITTLE(m + 48));
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x13 = XOR(x13, U8TO32_LITTLE(m + 52));
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x14 = XOR(x14, U8TO32_LITTLE(m + 56));
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x15 = XOR(x15, U8TO32_LITTLE(m + 60));
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#endif
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j12 = PLUSONE(j12);
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if (!j12)
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{
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j13 = PLUSONE(j13);
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/* stopping at 2^70 bytes per nonce is user's responsibility */
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}
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U32TO8_LITTLE(c + 0, x0);
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U32TO8_LITTLE(c + 4, x1);
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U32TO8_LITTLE(c + 8, x2);
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U32TO8_LITTLE(c + 12, x3);
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U32TO8_LITTLE(c + 16, x4);
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U32TO8_LITTLE(c + 20, x5);
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U32TO8_LITTLE(c + 24, x6);
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U32TO8_LITTLE(c + 28, x7);
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U32TO8_LITTLE(c + 32, x8);
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U32TO8_LITTLE(c + 36, x9);
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U32TO8_LITTLE(c + 40, x10);
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U32TO8_LITTLE(c + 44, x11);
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U32TO8_LITTLE(c + 48, x12);
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U32TO8_LITTLE(c + 52, x13);
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U32TO8_LITTLE(c + 56, x14);
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U32TO8_LITTLE(c + 60, x15);
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if (bytes <= 64)
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{
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if (bytes < 64)
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{
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for (i = 0; i < bytes; ++i)
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{
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ctarget[i] = c[i];
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}
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}
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x->input[12] = j12;
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x->input[13] = j13;
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return;
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}
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bytes -= 64;
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c += 64;
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#ifndef KEYSTREAM_ONLY
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m += 64;
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#endif
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}
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}
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