sas2026/tiny-AES
3
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

make thead safe via context pram; remove padding as non working; opitmise abit

Browse Source
This commit is contained in:
Stoian Ivanov
2017-12-05 03:06:57 +02:00
parent d234d31d18
commit 88f258872c
3 changed files with 163 additions and 165 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
aes.h
View File

@@ -28,26 +28,62 @@
//#define AES192 1
//#define AES256 1
#if defined(ECB) && (ECB == 1)
#define AES_BLOCKLEN 16 //Block length in bytes AES is 128b block only
void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length);
void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length);
#if defined(AES256) && (AES256 == 1)
#define AES_KEYLEN 32
#define AES_keyExpSize 240
#elif defined(AES192) && (AES192 == 1)
#define AES_KEYLEN 24
#define AES_keyExpSize 208
#else
#define AES_KEYLEN 16 // Key length in bytes
#define AES_keyExpSize 176
#endif
struct AES_ctx {
uint8_t RoundKey[AES_keyExpSize];
#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
uint8_t Iv[AES_BLOCKLEN];
#endif
};
void AES_init_ctx(struct AES_ctx *ctx,const uint8_t* key);
#if defined(CBC) && (CBC == 1)
void AES_init_ctx_iv(struct AES_ctx *ctx,const uint8_t* key,const uint8_t* iv);
void AES_ctx_set_iv(struct AES_ctx *ctx,const uint8_t* iv);
#endif
#if defined(ECB) && (ECB == 1)
// buffer size is exactly AES_BLOCKLEN bytes;
// you need only AES_init_ctx as Iv is not used in ECB
// NB: ECB s considered insecure
void AES_ECB_encrypt(struct AES_ctx *ctx, const uint8_t* input, uint8_t *output);
void AES_ECB_decrypt(struct AES_ctx *ctx, const uint8_t* input, uint8_t *output);
#endif // #if defined(ECB) && (ECB == !)
#if defined(CBC) && (CBC == 1)
void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
// buffer size MUST be mutile of AES_BLOCKLEN;
// We suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 if you need one
// you need to set iv in ctx via AES_init_ctx_iv or AES_ctx_set_iv
// NB: no IV should ever be reused with the same key
void AES_CBC_encrypt_buffer(struct AES_ctx *ctx, uint8_t* output, uint8_t* input, uint32_t length);
void AES_CBC_decrypt_buffer(struct AES_ctx *ctx, uint8_t* output, uint8_t* input, uint32_t length);
#endif // #if defined(CBC) && (CBC == 1)
#if defined(CTR) && (CTR == 1)
/* Same function for encrypting as for decrypting. Note no IV/nonce should ever be reused with the same key */
void AES_CTR_xcrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* nonce);
// Same function for encrypting as for decrypting.
// iv is incremented for every block, and usesd after encryption as xor compliment for output
// buffer size MUST be mutile of AES_BLOCKLEN;
// We suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 if you need one
// you need to set iv in ctx via AES_init_ctx_iv or AES_ctx_set_iv
// NB: no IV should ever be reused with the same key
void AES_CTR_xcrypt_buffer(struct AES_ctx *ctx, uint8_t* output, uint8_t* input, uint32_t length);
#endif // #if defined(CTR) && (CTR == 1)