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use consistent code style in chacha.c

pull/65/head
Daniel Micay 2018-10-19 17:07:30 -04:00
parent 1d2c10f5bb
commit 173ed53539
2 changed files with 149 additions and 151 deletions
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2
Makefile
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@ -6,7 +6,7 @@ SHARED_FLAGS := -O2 -flto -fPIC -fvisibility=hidden -fno-plt -pipe -Wall -Wextra
CFLAGS := -std=c11 $(SHARED_FLAGS) -Wmissing-prototypes CFLAGS := -std=c11 $(SHARED_FLAGS) -Wmissing-prototypes
CXXFLAGS := -std=c++14 $(SHARED_FLAGS) CXXFLAGS := -std=c++14 $(SHARED_FLAGS)
LDFLAGS := -Wl,-z,defs,-z,relro,-z,now,-z,nodlopen,-z,text LDFLAGS := -Wl,-z,defs,-z,relro,-z,now,-z,nodlopen,-z,text
TIDY_CHECKS := -checks=bugprone-*,-bugprone-macro-parentheses,cert-*,clang-analyzer-*,readability-*,-readability-braces-around-statements,-readability-else-after-return,-readability-inconsistent-declaration-parameter-name,-readability-named-parameter TIDY_CHECKS := -checks=bugprone-*,-bugprone-macro-parentheses,cert-*,clang-analyzer-*,readability-*,-readability-else-after-return,-readability-inconsistent-declaration-parameter-name,-readability-named-parameter
SOURCES := chacha.c malloc.c memory.c pages.c random.c util.c SOURCES := chacha.c malloc.c memory.c pages.c random.c util.c
OBJECTS := $(SOURCES:.c=.o) OBJECTS := $(SOURCES:.c=.o)

298
chacha.c
View File

@ -1,8 +1,6 @@
/* // Based on chacha-merged.c version 20080118
Based on chacha-merged.c version 20080118 // D. J. Bernstein
D. J. Bernstein // Public domain.
Public domain.
*/
#include "chacha.h" #include "chacha.h"
@ -13,167 +11,167 @@ Public domain.
#define U32V(v) ((u32)(v) & U32C(0xFFFFFFFF)) #define U32V(v) ((u32)(v) & U32C(0xFFFFFFFF))
#define ROTL32(v, n) \ #define ROTL32(v, n) \
(U32V((v) << (n)) | ((v) >> (32 - (n)))) (U32V((v) << (n)) | ((v) >> (32 - (n))))
#define U8TO32_LITTLE(p) \ #define U8TO32_LITTLE(p) \
(((u32)((p)[0]) ) | \ (((u32)((p)[0])) | \
((u32)((p)[1]) << 8) | \ ((u32)((p)[1]) << 8) | \
((u32)((p)[2]) << 16) | \ ((u32)((p)[2]) << 16) | \
((u32)((p)[3]) << 24)) ((u32)((p)[3]) << 24))
#define U32TO8_LITTLE(p, v) \ #define U32TO8_LITTLE(p, v) \
do { \ do { \
(p)[0] = U8V((v) ); \ (p)[0] = U8V((v)); \
(p)[1] = U8V((v) >> 8); \ (p)[1] = U8V((v) >> 8); \
(p)[2] = U8V((v) >> 16); \ (p)[2] = U8V((v) >> 16); \
(p)[3] = U8V((v) >> 24); \ (p)[3] = U8V((v) >> 24); \
} while (0) } while (0)
#define ROTATE(v,c) (ROTL32(v,c)) #define ROTATE(v, c) (ROTL32(v, c))
#define XOR(v,w) ((v) ^ (w)) #define XOR(v, w) ((v) ^ (w))
#define PLUS(v,w) (U32V((v) + (w))) #define PLUS(v, w) (U32V((v) + (w)))
#define PLUSONE(v) (PLUS((v),1)) #define PLUSONE(v) (PLUS((v), 1))
#define QUARTERROUND(a,b,c,d) \ #define QUARTERROUND(a, b, c, d) \
a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \ a = PLUS(a, b); d = ROTATE(XOR(d, a), 16); \
c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \ c = PLUS(c, d); b = ROTATE(XOR(b, c), 12); \
a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \ a = PLUS(a, b); d = ROTATE(XOR(d, a), 8); \
c = PLUS(c,d); b = ROTATE(XOR(b,c), 7); c = PLUS(c, d); b = ROTATE(XOR(b, c), 7);
static const char sigma[16] = "expand 32-byte k"; static const char sigma[16] = "expand 32-byte k";
void chacha_keysetup(chacha_ctx *x,const u8 *k) void chacha_keysetup(chacha_ctx *x, const u8 *k) {
{ x->input[0] = U8TO32_LITTLE(sigma + 0);
x->input[0] = U8TO32_LITTLE(sigma + 0); x->input[1] = U8TO32_LITTLE(sigma + 4);
x->input[1] = U8TO32_LITTLE(sigma + 4); x->input[2] = U8TO32_LITTLE(sigma + 8);
x->input[2] = U8TO32_LITTLE(sigma + 8); x->input[3] = U8TO32_LITTLE(sigma + 12);
x->input[3] = U8TO32_LITTLE(sigma + 12); x->input[4] = U8TO32_LITTLE(k + 0);
x->input[4] = U8TO32_LITTLE(k + 0); x->input[5] = U8TO32_LITTLE(k + 4);
x->input[5] = U8TO32_LITTLE(k + 4); x->input[6] = U8TO32_LITTLE(k + 8);
x->input[6] = U8TO32_LITTLE(k + 8); x->input[7] = U8TO32_LITTLE(k + 12);
x->input[7] = U8TO32_LITTLE(k + 12); x->input[8] = U8TO32_LITTLE(k + 16);
x->input[8] = U8TO32_LITTLE(k + 16); x->input[9] = U8TO32_LITTLE(k + 20);
x->input[9] = U8TO32_LITTLE(k + 20); x->input[10] = U8TO32_LITTLE(k + 24);
x->input[10] = U8TO32_LITTLE(k + 24); x->input[11] = U8TO32_LITTLE(k + 28);
x->input[11] = U8TO32_LITTLE(k + 28);
} }
void chacha_ivsetup(chacha_ctx *x,const u8 *iv) void chacha_ivsetup(chacha_ctx *x, const u8 *iv) {
{ x->input[12] = 0;
x->input[12] = 0; x->input[13] = 0;
x->input[13] = 0; x->input[14] = U8TO32_LITTLE(iv + 0);
x->input[14] = U8TO32_LITTLE(iv + 0); x->input[15] = U8TO32_LITTLE(iv + 4);
x->input[15] = U8TO32_LITTLE(iv + 4);
} }
void void chacha_keystream_bytes(chacha_ctx *x, u8 *c, u32 bytes) {
chacha_keystream_bytes(chacha_ctx *x,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;
u32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15; u8 *ctarget;
u32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15; u8 tmp[64];
u8 *ctarget; unsigned i;
u8 tmp[64];
unsigned i;
if (!bytes) return; if (!bytes) {
return;
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) {
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 = 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);
j12 = PLUSONE(j12);
if (!j12) {
j13 = PLUSONE(j13);
/* stopping at 2^70 bytes per nonce is user's responsibility */
} }
U32TO8_LITTLE(c + 0,x0); j0 = x->input[0];
U32TO8_LITTLE(c + 4,x1); j1 = x->input[1];
U32TO8_LITTLE(c + 8,x2); j2 = x->input[2];
U32TO8_LITTLE(c + 12,x3); j3 = x->input[3];
U32TO8_LITTLE(c + 16,x4); j4 = x->input[4];
U32TO8_LITTLE(c + 20,x5); j5 = x->input[5];
U32TO8_LITTLE(c + 24,x6); j6 = x->input[6];
U32TO8_LITTLE(c + 28,x7); j7 = x->input[7];
U32TO8_LITTLE(c + 32,x8); j8 = x->input[8];
U32TO8_LITTLE(c + 36,x9); j9 = x->input[9];
U32TO8_LITTLE(c + 40,x10); j10 = x->input[10];
U32TO8_LITTLE(c + 44,x11); j11 = x->input[11];
U32TO8_LITTLE(c + 48,x12); j12 = x->input[12];
U32TO8_LITTLE(c + 52,x13); j13 = x->input[13];
U32TO8_LITTLE(c + 56,x14); j14 = x->input[14];
U32TO8_LITTLE(c + 60,x15); j15 = x->input[15];
if (bytes <= 64) { for (;;) {
if (bytes < 64) { if (bytes < 64) {
for (i = 0;i < bytes;++i) ctarget[i] = c[i]; ctarget = c;
} c = tmp;
x->input[12] = j12; }
x->input[13] = j13; x0 = j0;
return; 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);
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];
}
}
x->input[12] = j12;
x->input[13] = j13;
return;
}
bytes -= 64;
c += 64;
} }
bytes -= 64;
c += 64;
}
} }