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ruanhaishen
Tiny AES C
Commits
2fe22ab8
Commit
2fe22ab8
authored
Feb 21, 2019
by
Torfinn Berset
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Update README
parent
7a35660a
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1
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README.md
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2fe22ab8
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@@ -15,8 +15,8 @@ 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);
/* Then start encrypting and decrypting with the functions below: */
void AES_ECB_encrypt(struct AES_ctx* ctx, uint8_t* buf);
void AES_ECB_decrypt(struct AES_ctx* ctx, uint8_t* buf);
void AES_ECB_encrypt(
const
struct AES_ctx* ctx, uint8_t* buf);
void AES_ECB_decrypt(
const
struct AES_ctx* ctx, uint8_t* buf);
void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
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@@ -47,21 +47,21 @@ GCC size output when only CTR mode is compiled for ARM:
$ arm-none-eabi-gcc -Os -DCBC=0 -DECB=0 -DCTR=1 -c aes.c
$ size aes.o
text data bss dec hex filename
1
20
3 0 0 1
20
3
4b3
aes.o
1
34
3 0 0 1
34
3
53f
aes.o
.. and when compiling for the THUMB instruction set, we end up just below 1K in code size.
$ arm-none-eabi-gcc -Os -mthumb -DCBC=0 -DECB=0 -DCTR=1 -c aes.c
$ size aes.o
text data bss dec hex filename
9
55
0 0 9
55
3
bb
aes.o
9
79
0 0 9
79
3
d3
aes.o
I am using the Free Software Foundation, ARM GCC compiler:
$ arm-none-eabi-gcc --version
arm-none-eabi-gcc (
4.8.4-1+11-1) 4.8.4
201
4
121
9
(release)
Copyright (C) 201
3
Free Software Foundation, Inc.
arm-none-eabi-gcc (
GNU Tools for Arm Embedded Processors 8-2018-q4-major) 8.2.1
201
8
121
3
(release)
Copyright (C) 201
8
Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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