use consistent code style in chacha.c
This commit is contained in:
Daniel Micay
parent
1d2c10f5bb
commit
173ed53539
2
Makefile
2
Makefile
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@ -6,7 +6,7 @@ SHARED_FLAGS := -O2 -flto -fPIC -fvisibility=hidden -fno-plt -pipe -Wall -Wextra
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CFLAGS := -std=c11 $(SHARED_FLAGS) -Wmissing-prototypes
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CXXFLAGS := -std=c++14 $(SHARED_FLAGS)
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LDFLAGS := -Wl,-z,defs,-z,relro,-z,now,-z,nodlopen,-z,text
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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
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TIDY_CHECKS := -checks=bugprone-*,-bugprone-macro-parentheses,cert-*,clang-analyzer-*,readability-*,-readability-else-after-return,-readability-inconsistent-declaration-parameter-name,-readability-named-parameter
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SOURCES := chacha.c malloc.c memory.c pages.c random.c util.c
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OBJECTS := $(SOURCES:.c=.o)
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298
chacha.c
298
chacha.c
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@ -1,8 +1,6 @@
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/*
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Based on 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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// Based on chacha-merged.c version 20080118
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// D. J. Bernstein
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// Public domain.
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#include "chacha.h"
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@ -13,167 +11,167 @@ Public domain.
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#define U32V(v) ((u32)(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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(U32V((v) << (n)) | ((v) >> (32 - (n))))
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#define U8TO32_LITTLE(p) \
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(((u32)((p)[0]) ) | \
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((u32)((p)[1]) << 8) | \
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((u32)((p)[2]) << 16) | \
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((u32)((p)[3]) << 24))
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(((u32)((p)[0])) | \
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((u32)((p)[1]) << 8) | \
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((u32)((p)[2]) << 16) | \
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((u32)((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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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 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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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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#define QUARTERROUND(a, b, c, d) \
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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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static const char sigma[16] = "expand 32-byte k";
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void chacha_keysetup(chacha_ctx *x,const u8 *k)
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{
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x->input[0] = U8TO32_LITTLE(sigma + 0);
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x->input[1] = U8TO32_LITTLE(sigma + 4);
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x->input[2] = U8TO32_LITTLE(sigma + 8);
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x->input[3] = U8TO32_LITTLE(sigma + 12);
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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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x->input[8] = U8TO32_LITTLE(k + 16);
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x->input[9] = U8TO32_LITTLE(k + 20);
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x->input[10] = U8TO32_LITTLE(k + 24);
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x->input[11] = U8TO32_LITTLE(k + 28);
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void chacha_keysetup(chacha_ctx *x, const u8 *k) {
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x->input[0] = U8TO32_LITTLE(sigma + 0);
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x->input[1] = U8TO32_LITTLE(sigma + 4);
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x->input[2] = U8TO32_LITTLE(sigma + 8);
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x->input[3] = U8TO32_LITTLE(sigma + 12);
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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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x->input[8] = U8TO32_LITTLE(k + 16);
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x->input[9] = U8TO32_LITTLE(k + 20);
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x->input[10] = U8TO32_LITTLE(k + 24);
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x->input[11] = U8TO32_LITTLE(k + 28);
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}
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void chacha_ivsetup(chacha_ctx *x,const u8 *iv)
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{
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x->input[12] = 0;
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x->input[13] = 0;
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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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void chacha_ivsetup(chacha_ctx *x, const u8 *iv) {
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x->input[12] = 0;
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x->input[13] = 0;
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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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void
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chacha_keystream_bytes(chacha_ctx *x,u8 *c,u32 bytes)
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{
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u32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
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u32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
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u8 *ctarget;
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u8 tmp[64];
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unsigned i;
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void chacha_keystream_bytes(chacha_ctx *x, u8 *c, u32 bytes) {
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u32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
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u32 j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
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u8 *ctarget;
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u8 tmp[64];
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unsigned i;
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if (!bytes) return;
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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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if (bytes < 64) {
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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 = 8;i > 0;i -= 2) {
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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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j12 = PLUSONE(j12);
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if (!j12) {
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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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if (!bytes) {
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return;
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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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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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if (bytes <= 64) {
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if (bytes < 64) {
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for (i = 0;i < bytes;++i) ctarget[i] = c[i];
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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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for (;;) {
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if (bytes < 64) {
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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 = 8; i > 0; i -= 2) {
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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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j12 = PLUSONE(j12);
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if (!j12) {
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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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if (bytes < 64) {
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for (i = 0; i < bytes; ++i) {
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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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}
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bytes -= 64;
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c += 64;
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}
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}
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