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-rw-r--r--lib/random/chacha.h304
1 files changed, 149 insertions, 155 deletions
diff --git a/lib/random/chacha.h b/lib/random/chacha.h
index b803c24a..a98c0b87 100644
--- a/lib/random/chacha.h
+++ b/lib/random/chacha.h
@@ -11,9 +11,8 @@ Public domain.
typedef unsigned char u8;
typedef unsigned int u32;
-typedef struct
-{
- u32 input[16]; /* could be compressed */
+typedef struct {
+ u32 input[16]; /* could be compressed */
} chacha_ctx;
#define KEYSZ 32
@@ -25,172 +24,167 @@ typedef struct
#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 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 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 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);
+#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[16] = "expand 32-byte k";
-static void
-chacha_keysetup(chacha_ctx *chacha, const u8 *k)
-{
- chacha->input[0] = U8TO32_LITTLE(sigma + 0);
- chacha->input[1] = U8TO32_LITTLE(sigma + 4);
- chacha->input[2] = U8TO32_LITTLE(sigma + 8);
- chacha->input[3] = U8TO32_LITTLE(sigma + 12);
- chacha->input[4] = U8TO32_LITTLE(k + 0);
- chacha->input[5] = U8TO32_LITTLE(k + 4);
- chacha->input[6] = U8TO32_LITTLE(k + 8);
- chacha->input[7] = U8TO32_LITTLE(k + 12);
- chacha->input[8] = U8TO32_LITTLE(k + 16);
- chacha->input[9] = U8TO32_LITTLE(k + 20);
- chacha->input[10] = U8TO32_LITTLE(k + 24);
- chacha->input[11] = U8TO32_LITTLE(k + 28);
+static void chacha_keysetup(chacha_ctx *chacha, const u8 *k) {
+ chacha->input[0] = U8TO32_LITTLE(sigma + 0);
+ chacha->input[1] = U8TO32_LITTLE(sigma + 4);
+ chacha->input[2] = U8TO32_LITTLE(sigma + 8);
+ chacha->input[3] = U8TO32_LITTLE(sigma + 12);
+ chacha->input[4] = U8TO32_LITTLE(k + 0);
+ chacha->input[5] = U8TO32_LITTLE(k + 4);
+ chacha->input[6] = U8TO32_LITTLE(k + 8);
+ chacha->input[7] = U8TO32_LITTLE(k + 12);
+ chacha->input[8] = U8TO32_LITTLE(k + 16);
+ chacha->input[9] = U8TO32_LITTLE(k + 20);
+ chacha->input[10] = U8TO32_LITTLE(k + 24);
+ chacha->input[11] = U8TO32_LITTLE(k + 28);
}
-static void
-chacha_ivsetup(chacha_ctx *chacha, const u8 *iv)
-{
- chacha->input[12] = 0;
- chacha->input[13] = 0;
- chacha->input[14] = U8TO32_LITTLE(iv + 0);
- chacha->input[15] = U8TO32_LITTLE(iv + 4);
+static void chacha_ivsetup(chacha_ctx *chacha, const u8 *iv) {
+ chacha->input[12] = 0;
+ chacha->input[13] = 0;
+ chacha->input[14] = U8TO32_LITTLE(iv + 0);
+ chacha->input[15] = U8TO32_LITTLE(iv + 4);
}
-static void
-chacha_encrypt_bytes(chacha_ctx *chacha, const u8 *m, u8 *c, u32 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 = (u8*)0;
- u8 tmp[64];
- unsigned int i;
-
- if (!bytes) return;
-
- j0 = chacha->input[0];
- j1 = chacha->input[1];
- j2 = chacha->input[2];
- j3 = chacha->input[3];
- j4 = chacha->input[4];
- j5 = chacha->input[5];
- j6 = chacha->input[6];
- j7 = chacha->input[7];
- j8 = chacha->input[8];
- j9 = chacha->input[9];
- j10 = chacha->input[10];
- j11 = chacha->input[11];
- j12 = chacha->input[12];
- j13 = chacha->input[13];
- j14 = chacha->input[14];
- j15 = chacha->input[15];
-
- for (;;) {
- if (bytes < 64) {
- for (i = 0;i < bytes;++i) tmp[i] = m[i];
- m = tmp;
- ctarget = c;
- c = tmp;
+static void chacha_encrypt_bytes(chacha_ctx *chacha, const u8 *m, u8 *c, u32 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 = (u8 *)0;
+ u8 tmp[64];
+ unsigned int i;
+
+ if (!bytes) return;
+
+ j0 = chacha->input[0];
+ j1 = chacha->input[1];
+ j2 = chacha->input[2];
+ j3 = chacha->input[3];
+ j4 = chacha->input[4];
+ j5 = chacha->input[5];
+ j6 = chacha->input[6];
+ j7 = chacha->input[7];
+ j8 = chacha->input[8];
+ j9 = chacha->input[9];
+ j10 = chacha->input[10];
+ j11 = chacha->input[11];
+ j12 = chacha->input[12];
+ j13 = chacha->input[13];
+ j14 = chacha->input[14];
+ j15 = chacha->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);
+
+ j12 = PLUSONE(j12);
+ if (!j12) {
+ j13 = PLUSONE(j13);
+ /* stopping at 2^70 bytes per nonce is user's responsibility */
+ }
+
+ 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 < bytes; ++i)
+ ctarget[i] = c[i];
+ }
+ chacha->input[12] = j12;
+ chacha->input[13] = j13;
+ return;
+ }
+ bytes -= 64;
+ c += 64;
}
- 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);
-
- j12 = PLUSONE(j12);
- if (!j12) {
- j13 = PLUSONE(j13);
- /* stopping at 2^70 bytes per nonce is user's responsibility */
- }
-
- 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 < bytes;++i) ctarget[i] = c[i];
- }
- chacha->input[12] = j12;
- chacha->input[13] = j13;
- return;
- }
- bytes -= 64;
- c += 64;
- }
}
generated by cgit v1.2.3 (git 2.25.1) at 2026-03-01 09:51:22 +0000