feat: sha256

include/digest_update.h

@@ -0,0 +1,20 @@
+#ifndef DIGEST_UPDATE_H
+#define DIGEST_UPDATE_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define IMPL_DIGEST_UPDATE(algo, block_mask, compress_fn)				\
+void																	\
+algo##_update(void *ctx, const uint8_t *data, size_t len)				\
+{																		\
+	struct algo##_ctx	*local_ctx = ctx;								\
+	for (size_t i = 0; i < len; ++i) {									\
+		local_ctx->buf[(local_ctx->count & (block_mask))] = data[i];	\
+		++local_ctx->count;												\
+		if (0 == (local_ctx->count & (block_mask)))						\
+			compress_fn(local_ctx, local_ctx->buf);						\
+	}																	\
+}
+
+#endif

include/sha256.h

@@ -15,4 +15,6 @@ void	sha256_init(void *ctx);
 void	sha256_update(void *ctx, const uint8_t *data, size_t len);
 void	sha256_final(void *ctx, uint8_t *out);
 
+extern const uint32_t	g_sha256_K[64];
+
 #endif

include/sha256_internal.h

@@ -0,0 +1,8 @@
+#ifndef SHA256_INTERNAL_H
+#define SHA256_INTERNAL_H
+
+#include "sha256.h"
+
+void	sha256_compress(struct sha256_ctx *ctx, const uint8_t block[64]);
+
+#endif

src/Makefile.am

@@ -6,7 +6,9 @@ libft_ssl_la_SOURCES		= libft_ssl.c \
 							  md5/md5_compress.c \
 							  md5/md5_update.c \
 							  md5/md5_final.c \
+							  sha256/sha256.c \
 							  sha256/sha256_init.c \
+							  sha256/sha256_compress.c \
 							  sha256/sha256_update.c \
 							  sha256/sha256_final.c
 

src/md5/md5_update.c

@@ -1,19 +1,4 @@
-#include "md5.h"
 #include "md5_internal.h"
-#include <stddef.h>
+#include "digest_update.h"
-#include <stdint.h>
 
-void	md5_update(void *ctx, const uint8_t *data, size_t len)
+IMPL_DIGEST_UPDATE(md5, 63, md5_compress)
-{
-	struct md5_ctx	*local_ctx = ctx;
-
-
-	for (size_t i = 0; i < len; ++i)
-	{
-		local_ctx->buf[(local_ctx->count & 63)] = data[i];
-		++local_ctx->count;
-		if (0 == (local_ctx->count & 63))
-			md5_compress(local_ctx, local_ctx->buf);
-	}
-
-}

src/sha256/sha256.c

@@ -0,0 +1,20 @@
+#include "sha256.h"
+
+const uint32_t	g_sha256_K[64] = {
+	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
+	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
+	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
+	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
+	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
+};

src/sha256/sha256_compress.c

@@ -0,0 +1,130 @@
+#include "sha256.h"
+#include "sha256_internal.h"
+#include <stdint.h>
+
+/* Forward declarations */
+static uint32_t	sha256_rotr(uint32_t x, uint32_t n);
+static uint32_t	sha256_ch(uint32_t e, uint32_t f, uint32_t g);
+static uint32_t	sha256_maj(uint32_t a, uint32_t b, uint32_t c);
+static uint32_t	sha256_Sigma0(uint32_t x);
+static uint32_t	sha256_Sigma1(uint32_t x);
+static uint32_t	sha256_sigma0(uint32_t x);
+static uint32_t	sha256_sigma1(uint32_t x);
+static void		sha256_decode(const uint8_t block[64], uint32_t w[16]);
+static void		sha256_schedule(uint32_t w[64], const uint8_t block[64]);
+static void		sha256_rounds(uint32_t state[8], const uint32_t w[64]);
+/* ------------- */
+
+void
+sha256_compress(struct sha256_ctx *ctx, const uint8_t block[64])
+{
+	uint32_t	w[64];
+
+	sha256_schedule(w, block);
+	sha256_rounds(ctx->state, w);
+}
+
+static void
+sha256_schedule(uint32_t w[64], const uint8_t block[64])
+{
+	sha256_decode(block, w);
+
+	for (uint8_t i = 16; i < 64; ++i)
+	{
+		w[i] = sha256_sigma1(w[i - 2]);
+		w[i] += w[i - 7];
+		w[i] += sha256_sigma0(w[i - 15]);
+		w[i] += w[i - 16];
+	}
+}
+
+static void
+sha256_rounds(uint32_t state[8], const uint32_t w[64])
+{
+	uint32_t	a = state[0];
+	uint32_t	b = state[1];
+	uint32_t	c = state[2];
+	uint32_t	d = state[3];
+	uint32_t	e = state[4];
+	uint32_t	f = state[5];
+	uint32_t	g = state[6];
+	uint32_t	h = state[7];
+
+	for (uint8_t i = 0; i < 64; ++i)
+	{
+		uint32_t	t1;
+		uint32_t	t2;
+
+		t1 = h + sha256_Sigma1(e) + sha256_ch(e, f, g) + g_sha256_K[i] + w[i];
+		t2 = sha256_Sigma0(a) + sha256_maj(a, b, c);
+
+		h = g; g = f; f = e; e = d + t1;
+		d = c; c = b; b = a; a = t1 + t2;
+	}
+
+	state[0] += a;
+	state[1] += b;
+	state[2] += c;
+	state[3] += d;
+	state[4] += e;
+	state[5] += f;
+	state[6] += g;
+	state[7] += h;
+}
+
+/* Decode 64 bytes into 16 x uint32_t words (big-endian) */
+static void
+sha256_decode(const uint8_t block[64], uint32_t w[16])
+{
+	for (uint8_t i = 0; i < 16; ++i)
+	{
+		const uint8_t	i4 = i * 4;
+
+		w[i] = (uint32_t)block[i4 + 0] << 24
+			 | (uint32_t)block[i4 + 1] << 16
+			 | (uint32_t)block[i4 + 2] << 8
+			 | (uint32_t)block[i4 + 3] << 0;
+	}
+}
+
+static uint32_t
+sha256_rotr(uint32_t x, uint32_t n)
+{
+	return (x >> n) | (x << (32u - n));
+}
+
+static uint32_t
+sha256_ch(uint32_t e, uint32_t f, uint32_t g)
+{
+	return (e & f) ^ (~e & g);
+}
+
+static uint32_t
+sha256_maj(uint32_t a, uint32_t b, uint32_t c)
+{
+	return (a & b) ^ (a & c) ^ (b & c);
+}
+
+static uint32_t
+sha256_Sigma0(uint32_t x)
+{
+	return sha256_rotr(x, 2) ^ sha256_rotr(x, 13) ^ sha256_rotr(x, 22);
+}
+
+static uint32_t
+sha256_Sigma1(uint32_t x)
+{
+	return sha256_rotr(x, 6) ^ sha256_rotr(x, 11) ^ sha256_rotr(x, 25);
+}
+
+static uint32_t
+sha256_sigma0(uint32_t x)
+{
+	return sha256_rotr(x, 7) ^ sha256_rotr(x, 18) ^ (x >> 3);
+}
+
+static uint32_t
+sha256_sigma1(uint32_t x)
+{
+	return sha256_rotr(x, 17) ^ sha256_rotr(x, 19) ^ (x >> 10);
+}

src/sha256/sha256_final.c

@@ -1,6 +1,55 @@
-#include "compiler.h"
+#include "sha256_internal.h"
-#include "sha256.h"
 
-void	sha256_final(__unused void *ctx, __unused uint8_t *out)
+/* Forward declarations */
+static void			sha256_pad(struct sha256_ctx *ctx);
+static inline void	sha256_write_len(struct sha256_ctx *ctx, uint64_t bitlen);
+static void			sha256_encode(const struct sha256_ctx *ctx, uint8_t out[32]);
+/* ---------------- */
+
+void	sha256_final(void *ctx, uint8_t *out)
 {
+	struct sha256_ctx	*local_ctx = ctx;
+
+	sha256_pad(local_ctx);
+	sha256_encode(local_ctx, out);
+}
+
+static void
+sha256_pad(struct sha256_ctx *ctx)
+{
+	uint64_t	bitlen = ctx->count * 8;
+
+	ctx->buf[ctx->count++ & 63] = 0x80;
+	if ((ctx->count & 63) > 56)
+	{
+		while ((ctx->count & 63) != 0)
+			ctx->buf[ctx->count++ & 63] = 0x00;
+		sha256_compress(ctx, ctx->buf);
+	}
+	while ((ctx->count & 63) < 56)
+		ctx->buf[ctx->count++ & 63] = 0x00;
+	sha256_write_len(ctx, bitlen);
+	sha256_compress(ctx, ctx->buf);
+}
+
+static inline void
+sha256_write_len(struct sha256_ctx *ctx, uint64_t bitlen)
+{
+	for (uint8_t i = 0; i < 8; ++i)
+		ctx->buf[56 + i] = (uint8_t)(bitlen >> (56 - 8 * i));
+}
+
+static void
+sha256_encode(const struct sha256_ctx *ctx, uint8_t out[32])
+{
+	for (uint8_t i = 0; i < 8; ++i)
+		{
+			const uint8_t	i4 = i * 4;
+			uint32_t 		v = ctx->state[i];
+
+			out[i4 + 0] = (uint8_t)(v >> 24);
+			out[i4 + 1] = (uint8_t)(v >> 16);
+			out[i4 + 2] = (uint8_t)(v >> 8);
+			out[i4 + 3] = (uint8_t)(v >> 0);
+		}
 }

src/sha256/sha256_init.c

@@ -1,6 +1,17 @@
-#include "compiler.h"
 #include "sha256.h"
 
-void	sha256_init(__unused void *ctx)
+void	sha256_init(void *ctx)
 {
+	struct sha256_ctx	*local_ctx = ctx;
+
+	local_ctx->state[0] = 0x6a09e667;
+	local_ctx->state[1] = 0xbb67ae85;
+	local_ctx->state[2] = 0x3c6ef372;
+	local_ctx->state[3] = 0xa54ff53a;
+	local_ctx->state[4] = 0x510e527f;
+	local_ctx->state[5] = 0x9b05688c;
+	local_ctx->state[6] = 0x1f83d9ab;
+	local_ctx->state[7] = 0x5be0cd19;
+
+	local_ctx->count = 0;
 }

src/sha256/sha256_update.c

@@ -1,7 +1,4 @@
-#include "compiler.h"
+#include "sha256_internal.h"
-#include "sha256.h"
+#include "digest_update.h"
 
-void	sha256_update(__unused void *ctx, __unused const uint8_t *data,
+IMPL_DIGEST_UPDATE(sha256, 63, sha256_compress)
-		__unused size_t len)
-{
-}