mirror of https://github.com/kokke/tiny-AES-c
Const-qualify all read-only pointers
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18
aes.c
18
aes.c
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@ -240,7 +240,7 @@ void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv)
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// This function adds the round key to state.
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// The round key is added to the state by an XOR function.
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static void AddRoundKey(uint8_t round,state_t* state,uint8_t* RoundKey)
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static void AddRoundKey(uint8_t round, state_t* state, const uint8_t* RoundKey)
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{
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uint8_t i,j;
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for (i = 0; i < 4; ++i)
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@ -408,7 +408,7 @@ static void InvShiftRows(state_t* state)
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#endif // #if (defined(CBC) && CBC == 1) || (defined(ECB) && ECB == 1)
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// Cipher is the main function that encrypts the PlainText.
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static void Cipher(state_t* state, uint8_t* RoundKey)
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static void Cipher(state_t* state, const uint8_t* RoundKey)
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{
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uint8_t round = 0;
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@ -434,7 +434,7 @@ static void Cipher(state_t* state, uint8_t* RoundKey)
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}
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#if (defined(CBC) && CBC == 1) || (defined(ECB) && ECB == 1)
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static void InvCipher(state_t* state,uint8_t* RoundKey)
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static void InvCipher(state_t* state, const uint8_t* RoundKey)
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{
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uint8_t round = 0;
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@ -466,13 +466,13 @@ static void InvCipher(state_t* state,uint8_t* RoundKey)
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#if defined(ECB) && (ECB == 1)
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void AES_ECB_encrypt(struct AES_ctx *ctx, uint8_t* buf)
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void AES_ECB_encrypt(const struct AES_ctx *ctx, uint8_t* buf)
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{
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// The next function call encrypts the PlainText with the Key using AES algorithm.
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Cipher((state_t*)buf, ctx->RoundKey);
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}
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void AES_ECB_decrypt(struct AES_ctx* ctx, uint8_t* buf)
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void AES_ECB_decrypt(const struct AES_ctx* ctx, uint8_t* buf)
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{
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// The next function call decrypts the PlainText with the Key using AES algorithm.
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InvCipher((state_t*)buf, ctx->RoundKey);
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@ -488,7 +488,7 @@ void AES_ECB_decrypt(struct AES_ctx* ctx, uint8_t* buf)
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#if defined(CBC) && (CBC == 1)
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static void XorWithIv(uint8_t* buf, uint8_t* Iv)
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static void XorWithIv(uint8_t* buf, const uint8_t* Iv)
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{
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uint8_t i;
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for (i = 0; i < AES_BLOCKLEN; ++i) // The block in AES is always 128bit no matter the key size
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@ -497,7 +497,7 @@ static void XorWithIv(uint8_t* buf, uint8_t* Iv)
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}
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}
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void AES_CBC_encrypt_buffer(struct AES_ctx *ctx,uint8_t* buf, uint32_t length)
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void AES_CBC_encrypt_buffer(struct AES_ctx *ctx, uint8_t* buf, uint32_t length)
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{
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uintptr_t i;
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uint8_t *Iv = ctx->Iv;
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@ -552,9 +552,9 @@ void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length)
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/* Increment Iv and handle overflow */
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for (bi = (AES_BLOCKLEN - 1); bi >= 0; --bi)
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{
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/* inc will owerflow */
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/* inc will overflow */
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if (ctx->Iv[bi] == 255)
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{
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{
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ctx->Iv[bi] = 0;
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continue;
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}
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4
aes.h
4
aes.h
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@ -58,8 +58,8 @@ void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv);
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// buffer size is exactly AES_BLOCKLEN bytes;
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// you need only AES_init_ctx as IV is not used in ECB
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// NB: ECB is considered insecure for most uses
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void AES_ECB_encrypt(struct AES_ctx* ctx, uint8_t* buf);
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void AES_ECB_decrypt(struct AES_ctx* ctx, uint8_t* buf);
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void AES_ECB_encrypt(const struct AES_ctx* ctx, uint8_t* buf);
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void AES_ECB_decrypt(const struct AES_ctx* ctx, uint8_t* buf);
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#endif // #if defined(ECB) && (ECB == !)
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