implemented some socket functions

src/cryptography/AES.c

@@ -0,0 +1,125 @@
+#include "cryptography.h"
+#include "BearSSL/inc/bearssl_block.h"
+#include <assert.h>
+
+// size must be multiple of 16
+#define __AES_BUFFER_SIZE 256
+
+typedef struct EncryptorAES {
+    br_aes_ct64_cbcenc_keys enc_ctx;
+    Array buf;
+    Array iv;
+} EncryptorAES;
+
+typedef struct DecryptorAES {
+    br_aes_ct64_cbcdec_keys dec_ctx;
+    Array buf;
+    Array iv;
+} DecryptorAES;
+
+EncryptorAES* EncryptorAES_create(Array key){
+    assert(key.size == 16 || key.size == 24 || key.size == 32);
+    
+    EncryptorAES* ptr = (EncryptorAES*)malloc(sizeof(EncryptorAES));
+    br_aes_ct64_cbcenc_init(&ptr->enc_ctx, key.data, key.size);
+
+    // size must be multiple of 16
+    ptr->buf = Array_alloc(u8, __AES_BUFFER_SIZE);
+    Array_memset(&ptr->buf, 0);
+
+    // size of one SHA block (16 bytes)
+    ptr->iv = Array_alloc(u8, 16); 
+    Array_memset(&ptr->iv, 0);
+
+    return ptr;
+}
+
+void EncryptorAES_destroy(EncryptorAES* ptr){
+    free(ptr->buf.data);
+    free(ptr->iv.data);
+}
+
+void EncryptorAES_encrypt(EncryptorAES* ptr, Array src, Array dst){
+    assert(dst.size >= EncryptorAES_calcDstSize(src.size));
+    
+    const EncryptedBlockInfo block_info = { .padding_size = 16 - src.size % 16 };
+    memcpy(ptr->buf.data, &block_info, sizeof(EncryptedBlockInfo));
+    // encrypt this struct
+    br_aes_ct64_cbcenc_run(&ptr->enc_ctx, ptr->iv.data, ptr->buf.data, sizeof(EncryptedBlockInfo));
+    // emit EncryptedBlockInfo to beginning of result
+    memcpy(dst.data, ptr->buf.data, sizeof(EncryptedBlockInfo));
+    dst.data += sizeof(EncryptedBlockInfo);
+    dst.size -= sizeof(EncryptedBlockInfo);
+    
+    // write full blocks
+    while(src.size > ptr->buf.size){
+        memcpy(ptr->buf.data, src.data, ptr->buf.size);
+        src.data += ptr->buf.size;
+        src.size -= ptr->buf.size;
+        br_aes_ct64_cbcenc_run(&ptr->enc_ctx, ptr->iv.data, ptr->buf.data, ptr->buf.size);
+        memcpy(dst.data, ptr->buf.data, ptr->buf.size);
+        dst.data += ptr->buf.size;
+        dst.size -= ptr->buf.size;
+    }
+    
+    // write incomplete block
+    Array_memset(&ptr->buf, 0);
+    memcpy(ptr->buf.data, src.data, src.size);
+    u32 src_size_padded = src.size + block_info.padding_size;
+    br_aes_ct64_cbcenc_run(&ptr->enc_ctx, ptr->iv.data, ptr->buf.data, src_size_padded);
+    memcpy(dst.data, ptr->buf.data, src_size_padded);
+}
+
+
+DecryptorAES* DecryptorAES_create(Array key){
+    assert(key.size == 16 || key.size == 24 || key.size == 32);
+    
+    DecryptorAES* ptr = (DecryptorAES*)malloc(sizeof(DecryptorAES));
+    br_aes_ct64_cbcdec_init(&ptr->dec_ctx, key.data, key.size);
+
+    // size must be multiple of 16
+    ptr->buf = Array_alloc(u8, __AES_BUFFER_SIZE);
+    Array_memset(&ptr->buf, 0);
+
+    // size of one SHA block (16 bytes)
+    ptr->iv = Array_alloc(u8, 16); 
+    Array_memset(&ptr->iv, 0);
+
+    return ptr;
+}
+
+void DecryptorAES_destroy(DecryptorAES* ptr){
+    free(ptr->buf.data);
+    free(ptr->iv.data);
+}
+
+void DecryptorAES_decrypt(DecryptorAES* ptr, Array src, Array dst, u32* decrypted_size){
+    assert(dst.size >= src.size);
+    
+    // read EncryptedBlockInfo from beginning of data
+    EncryptedBlockInfo block_info;
+    memcpy(&block_info, src.data, sizeof(EncryptedBlockInfo));
+    src.data += sizeof(EncryptedBlockInfo);
+    src.size -= sizeof(EncryptedBlockInfo);
+    // decrypt this struct
+    br_aes_ct64_cbcdec_run(&ptr->dec_ctx, ptr->iv.data, &block_info, sizeof(EncryptedBlockInfo));
+    *decrypted_size = src.size - block_info.padding_size;
+
+    // write full blocks
+    while(src.size > ptr->buf.size){
+        memcpy(ptr->buf.data, src.data, ptr->buf.size);
+        src.data += ptr->buf.size;
+        src.size -= ptr->buf.size;
+        br_aes_ct64_cbcdec_run(&ptr->dec_ctx, ptr->iv.data, ptr->buf.data, ptr->buf.size);
+        memcpy(dst.data, ptr->buf.data, ptr->buf.size);
+        dst.data += ptr->buf.size;
+        dst.size -= ptr->buf.size;
+    }
+    
+    // write incomplete block
+    Array_memset(&ptr->buf, 0);
+    memcpy(ptr->buf.data, src.data, src.size);
+    u32 src_size_padded = src.size + block_info.padding_size;
+    br_aes_ct64_cbcdec_run(&ptr->dec_ctx, ptr->iv.data, ptr->buf.data, src_size_padded);
+    memcpy(dst.data, ptr->buf.data, src_size_padded);
+}

src/cryptography/cryptography.h

@@ -0,0 +1,51 @@
+#pragma once
+#include "tlibc/std.h"
+#include "tlibc/collections/Array.h"
+#include "tlibc/string/str.h"
+
+/// @brief hashes password multiple times using its own hash as salt 
+/// @param password some byte array 
+/// @param iterations number of iterations
+/// @return Array<u8, 32>
+Array hash_password(str password, i32 iterations);
+
+
+typedef struct EncryptedBlockInfo {
+    u32 padding_size;
+    u32 _reserved;
+    u64 __reserved;
+} EncryptedBlockInfo;
+
+typedef struct EncryptorAES EncryptorAES;
+
+/// @param key Array<u8, 16 | 24 | 32>
+EncryptorAES* EncryptorAES_create(Array key);
+
+void EncryptorAES_destroy(EncryptorAES* ptr);
+
+/// @brief Encrypts `src` and writes output to `dst`.
+/// @param src array of any size
+/// @param dst array of size >= EncryptorAES_calcDstSize(src.size)
+void EncryptorAES_encrypt(EncryptorAES* ptr, Array src, Array dst);
+
+#define EncryptorAES_calcDstSize(SRC_SIZE) (ALIGN_TO(SRC_SIZE, 16) + sizeof(EncryptedBlockInfo))
+
+typedef struct DecryptorAES DecryptorAES;
+
+/// @param key Array<u8, 16 | 24 | 32>
+DecryptorAES* DecryptorAES_create(Array key);
+
+void DecryptorAES_destroy(DecryptorAES* ptr);
+
+/// @brief Decrypts `src` and writes output to `dst`.
+/// @param src array of any size
+/// @param dst array of size >= src.size
+/// @param decrypted_size size of original data without padding added by EncryptorAES_encrypt
+void DecryptorAES_decrypt(DecryptorAES* ptr, Array src, Array dst, u32* decrypted_size);
+
+
+
+typedef struct EncryptorRSA EncryptorRSA;
+
+
+typedef struct DecryptorRSA DecryptorRSA;

src/cryptography/hash.c

@@ -0,0 +1,18 @@
+#include "cryptography.h"
+#include "BearSSL/inc/bearssl_hash.h"
+
+Array hash_password(str password, i32 iterations){
+    Array hash_buffer = Array_alloc(u8, br_sha256_SIZE);
+    Array_memset(&hash_buffer, 0);
+    br_sha256_context sha256_ctx;
+    br_sha256_init(&sha256_ctx);
+
+    for(i32 i = 0; i < iterations; i++){
+        br_sha256_update(&sha256_ctx, password.data, password.size);
+        br_sha256_out(&sha256_ctx, hash_buffer.data);
+        br_sha256_update(&sha256_ctx, hash_buffer.data, hash_buffer.size);
+    }
+    br_sha256_out(&sha256_ctx, hash_buffer.data);
+
+    return hash_buffer;
+}