Import code from previous AssetBuilder version

2025-06-10 14:58:10 -05:00 · 2019-09-24 10:45:09 +02:00
parent 5609557516
commit 0d8432d4f7
919 changed files with 154412 additions and 26 deletions
--- a/thirdparty/salsa20/salsa20.cpp
+++ b/thirdparty/salsa20/salsa20.cpp
@ -0,0 +1,160 @@
+/*
+BASED ON salsa20-ref.c version 20051118
+original author: D. J. Bernstein
+Public domain.
+*/
+
+#include "salsa20.h"
+#include <cassert>
+
+#define U8V(v) ((uint8_t)(v) & 0xFFu)
+#define U16V(v) ((uint16_t)(v) & 0xFFFFu)
+#define U32V(v) ((uint32_t)(v) & 0xFFFFFFFFu)
+#define U64V(v) ((uint64_t)(v) & 0xFFFFFFFFFFFFFFFFu)
+
+#define ROTL8(v, n) \
+  (U8V((v) << (n)) | ((v) >> (8 - (n))))
+
+#define ROTL16(v, n) \
+  (U16V((v) << (n)) | ((v) >> (16 - (n))))
+
+#define ROTL32(v, n) \
+  (U32V((v) << (n)) | ((v) >> (32 - (n))))
+
+#define ROTL64(v, n) \
+  (U64V((v) << (n)) | ((v) >> (64 - (n))))
+
+#define SWAP32(v) \
+  ((ROTL32(v,  8) & 0x00FF00FFu) | \
+   (ROTL32(v, 24) & 0xFF00FF00u))
+
+#define XOR(v,w) ((v) ^ (w))
+#define PLUS(v,w) (U32V((v) + (w)))
+#define PLUSONE(v) (PLUS((v),1))
+
+#ifdef BIG_ENDIAN
+#define U32TO8_LITTLE(output8, input32) (((uint32_t*)(output8))[0] = SWAP32(input32))
+#define U8TO32_LITTLE(input8) (SWAP32(((uint32_t*)(input8))[0]))
+#else
+#define U32TO8_LITTLE(output8, input32) (((uint32_t*)(output8))[0] = (input32))
+#define U8TO32_LITTLE(input8) (((uint32_t*)(input8))[0])
+#endif
+
+static void Salsa20_WordToByte(uint8_t output[64], const uint32_t input[16])
+{
+    uint32_t x[16];
+    int i;
+
+    for (i = 0; i < 16; ++i) x[i] = input[i];
+    for (i = 20; i > 0; i -= 2)
+    {
+        x[ 4] ^= ROTL32(PLUS(x[ 0], x[12]), 7);
+        x[ 8] ^= ROTL32(PLUS(x[ 4], x[ 0]), 9);
+        x[12] ^= ROTL32(PLUS(x[ 8], x[ 4]), 13);
+        x[ 0] ^= ROTL32(PLUS(x[12], x[ 8]), 18);
+        x[ 9] ^= ROTL32(PLUS(x[ 5], x[ 1]), 7);
+        x[13] ^= ROTL32(PLUS(x[ 9], x[ 5]), 9);
+        x[ 1] ^= ROTL32(PLUS(x[13], x[ 9]), 13);
+        x[ 5] ^= ROTL32(PLUS(x[ 1], x[13]), 18);
+        x[14] ^= ROTL32(PLUS(x[10], x[ 6]), 7);
+        x[ 2] ^= ROTL32(PLUS(x[14], x[10]), 9);
+        x[ 6] ^= ROTL32(PLUS(x[ 2], x[14]), 13);
+        x[10] ^= ROTL32(PLUS(x[ 6], x[ 2]), 18);
+        x[ 3] ^= ROTL32(PLUS(x[15], x[11]), 7);
+        x[ 7] ^= ROTL32(PLUS(x[ 3], x[15]), 9);
+        x[11] ^= ROTL32(PLUS(x[ 7], x[ 3]), 13);
+        x[15] ^= ROTL32(PLUS(x[11], x[ 7]), 18);
+        x[ 1] ^= ROTL32(PLUS(x[ 0], x[ 3]), 7);
+        x[ 2] ^= ROTL32(PLUS(x[ 1], x[ 0]), 9);
+        x[ 3] ^= ROTL32(PLUS(x[ 2], x[ 1]), 13);
+        x[ 0] ^= ROTL32(PLUS(x[ 3], x[ 2]), 18);
+        x[ 6] ^= ROTL32(PLUS(x[ 5], x[ 4]), 7);
+        x[ 7] ^= ROTL32(PLUS(x[ 6], x[ 5]), 9);
+        x[ 4] ^= ROTL32(PLUS(x[ 7], x[ 6]), 13);
+        x[ 5] ^= ROTL32(PLUS(x[ 4], x[ 7]), 18);
+        x[11] ^= ROTL32(PLUS(x[10], x[ 9]), 7);
+        x[ 8] ^= ROTL32(PLUS(x[11], x[10]), 9);
+        x[ 9] ^= ROTL32(PLUS(x[ 8], x[11]), 13);
+        x[10] ^= ROTL32(PLUS(x[ 9], x[ 8]), 18);
+        x[12] ^= ROTL32(PLUS(x[15], x[14]), 7);
+        x[13] ^= ROTL32(PLUS(x[12], x[15]), 9);
+        x[14] ^= ROTL32(PLUS(x[13], x[12]), 13);
+        x[15] ^= ROTL32(PLUS(x[14], x[13]), 18);
+    }
+    for (i = 0; i < 16; ++i) x[i] = PLUS(x[i], input[i]);
+    for (i = 0; i < 16; ++i) U32TO8_LITTLE(output + 4 * i, x[i]);
+}
+
+static const char* sigma = "expand 32-byte k";
+static const char* tau = "expand 16-byte k";
+
+void Salsa20_KeySetup(salsa20_ctx* ctx, const uint8_t* key, const uint32_t keySize)
+{
+    const char* constants;
+
+    assert(keySize == 256 || keySize == 128);
+
+    ctx->m_input[1] = U8TO32_LITTLE(key + 0);
+    ctx->m_input[2] = U8TO32_LITTLE(key + 4);
+    ctx->m_input[3] = U8TO32_LITTLE(key + 8);
+    ctx->m_input[4] = U8TO32_LITTLE(key + 12);
+    if (keySize == 256)
+    {
+        /* recommended */
+        key += 16;
+        constants = sigma;
+    }
+    else
+    {
+        /* keySize == 128 */
+        constants = tau;
+    }
+    ctx->m_input[11] = U8TO32_LITTLE(key + 0);
+    ctx->m_input[12] = U8TO32_LITTLE(key + 4);
+    ctx->m_input[13] = U8TO32_LITTLE(key + 8);
+    ctx->m_input[14] = U8TO32_LITTLE(key + 12);
+    ctx->m_input[0] = U8TO32_LITTLE(constants + 0);
+    ctx->m_input[5] = U8TO32_LITTLE(constants + 4);
+    ctx->m_input[10] = U8TO32_LITTLE(constants + 8);
+    ctx->m_input[15] = U8TO32_LITTLE(constants + 12);
+}
+
+void Salsa20_IVSetup(salsa20_ctx* ctx, const uint8_t* iv)
+{
+    ctx->m_input[6] = U8TO32_LITTLE(iv + 0);
+    ctx->m_input[7] = U8TO32_LITTLE(iv + 4);
+    ctx->m_input[8] = 0;
+    ctx->m_input[9] = 0;
+}
+
+void Salsa20_Encrypt_Bytes(salsa20_ctx* ctx, const uint8_t* plainText, uint8_t* cipherText, uint32_t msgLen)
+{
+    uint8_t output[64];
+    unsigned int i;
+
+    if (!msgLen) return;
+    for (;;)
+    {
+        Salsa20_WordToByte(output, ctx->m_input);
+        ctx->m_input[8] = PLUSONE(ctx->m_input[8]);
+        if (!ctx->m_input[8])
+        {
+            ctx->m_input[9] = PLUSONE(ctx->m_input[9]);
+            /* stopping at 2^70 bytes per nonce is user's responsibility */
+        }
+        if (msgLen <= 64)
+        {
+            for (i = 0; i < msgLen; ++i) cipherText[i] = plainText[i] ^ output[i];
+            return;
+        }
+        for (i = 0; i < 64; ++i) cipherText[i] = plainText[i] ^ output[i];
+        msgLen -= 64;
+        cipherText += 64;
+        plainText += 64;
+    }
+}
+
+void Salsa20_Decrypt_Bytes(salsa20_ctx* ctx, const uint8_t* cipherText, uint8_t* plainText, const uint32_t msgLen)
+{
+    Salsa20_Encrypt_Bytes(ctx, cipherText, plainText, msgLen);
+}
--- a/thirdparty/salsa20/salsa20.h
+++ b/thirdparty/salsa20/salsa20.h
@ -0,0 +1,55 @@
+/*
+BASED ON salsa20-ref.c version 20051118
+original author: D. J. Bernstein
+Public domain.
+*/
+
+#pragma once
+
+#include <cstdint>
+
+struct salsa20_ctx
+{
+    uint32_t m_input[16];
+};
+
+/*
+ * Initializes the context with the chosen key.
+ * 
+ * ctx: The context to initialize.
+ * key: A pointer to the key bytes.
+ * keySize: The length of the key in bits. Has to be 128 or 256.
+ */
+void Salsa20_KeySetup(salsa20_ctx* ctx, const uint8_t* key, uint32_t keySize);
+
+/*
+ * Initializes or changes the IV of the context.
+ * Can be called multiple times on the same context in order to encrypt/decrypt messages with the same key but different IV's.
+ * 
+ * ctx: The context to initialize.
+ * iv: A pointer to the IV bytes. Must be 64 bits long.
+ */
+void Salsa20_IVSetup(salsa20_ctx* ctx, const uint8_t* iv);
+
+/*
+ * Encrypts the specified amount of plain text and writes it to the cipher text buffer.
+ * The cipher text buffer and the plain text buffer can be the same.
+ * 
+ * ctx: The context that was previously initialized with a key and IV.
+ * cipherText: A pointer to the cipher text buffer which must at least be msgLen bytes.
+ * plainText: A pointer to the plain text buffer which must at least be msgLen bytes.
+ * msgLen: The amount of bytes to encrypt.
+ */
+void Salsa20_Encrypt_Bytes(salsa20_ctx* ctx, const uint8_t* plainText, uint8_t* cipherText, uint32_t msgLen);
+
+/*
+ * Decrypts the specified amount of cipher text and writes it to the plain text buffer.
+ * The cipher text buffer and the plain text buffer can be the same.
+ * Internally just calls the encryption method.
+ * 
+ * ctx: The context that was previously initialized with a key and IV.
+ * cipherText: A pointer to the cipher text buffer which must at least be msgLen bytes.
+ * plainText: A pointer to the plain text buffer which must at least be msgLen bytes.
+ * msgLen: The amount of bytes to decrypt.
+ */
+void Salsa20_Decrypt_Bytes(salsa20_ctx* ctx, const uint8_t* cipherText, uint8_t* plainText, uint32_t msgLen);
--- a/thirdparty/salsa20/salsa20.vcxproj
+++ b/thirdparty/salsa20/salsa20.vcxproj
@ -0,0 +1,174 @@
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