47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#pragma once
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#include <cstddef>
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#include <cstdint>
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#if USE_WIN_CRYPTO
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#include <windows.h>
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#include <bcrypt.h>
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#endif
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namespace AES {
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constexpr size_t kKeyLen = 16; // Key length in bytes
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constexpr size_t kKeyExpansionSize = 176;
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constexpr size_t kBlockLen = 16; // Block length in bytes - AES is 128b block only
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struct AES_ctx {
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#if USE_WIN_CRYPTO
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BCRYPT_ALG_HANDLE hAlg;
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BCRYPT_KEY_HANDLE hKey;
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uint8_t iv[0x10];
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#else
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uint8_t RoundKey[kKeyExpansionSize];
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uint8_t Iv[16];
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#endif
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};
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bool AES_init_ctx_iv(AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
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// buffer size MUST be mutile of AES_BLOCKLEN;
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// Suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme
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// NOTES: you need to set IV in ctx via AES_init_ctx_iv() or AES_ctx_set_iv()
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// no IV should ever be reused with the same key
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size_t AES_CBC_encrypt_buffer(AES_ctx* ctx, uint8_t* buf, size_t length);
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size_t AES_CBC_decrypt_buffer(AES_ctx* ctx, uint8_t* buf, size_t length);
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#if USE_WIN_CRYPTO
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bool AES_cleanup(AES_ctx* ctx);
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#else
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inline bool AES_cleanup(AES_ctx* ctx) {
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return true;
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}
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#endif
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} // namespace AES
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