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Copy path__init__.c
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58 lines (51 loc) · 1.64 KB
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#include <string.h>
#include "py/runtime.h"
#include "shared-bindings/aesio/__init__.h"
#include "shared-module/aesio/__init__.h"
void common_hal_aesio_aes_construct(aesio_aes_obj_t *self, const uint8_t *key,
uint32_t key_length, const uint8_t *iv,
int mode, int counter) {
self->mode = mode;
self->counter = counter;
common_hal_aesio_aes_rekey(self, key, key_length, iv);
}
void common_hal_aesio_aes_rekey(aesio_aes_obj_t *self, const uint8_t *key,
uint32_t key_length, const uint8_t *iv) {
memset(&self->ctx, 0, sizeof(self->ctx));
if (iv != NULL) {
AES_init_ctx_iv(&self->ctx, key, key_length, iv);
} else {
AES_init_ctx(&self->ctx, key, key_length);
}
}
void common_hal_aesio_aes_set_mode(aesio_aes_obj_t *self, int mode) {
self->mode = mode;
}
void common_hal_aesio_aes_encrypt(aesio_aes_obj_t *self, uint8_t *buffer,
size_t length) {
switch (self->mode) {
case AES_MODE_ECB:
AES_ECB_encrypt(&self->ctx, buffer);
break;
case AES_MODE_CBC:
AES_CBC_encrypt_buffer(&self->ctx, buffer, length);
break;
case AES_MODE_CTR:
AES_CTR_xcrypt_buffer(&self->ctx, buffer, length);
break;
}
}
void common_hal_aesio_aes_decrypt(aesio_aes_obj_t *self, uint8_t *buffer,
size_t length) {
switch (self->mode) {
case AES_MODE_ECB:
AES_ECB_decrypt(&self->ctx, buffer);
break;
case AES_MODE_CBC:
AES_CBC_decrypt_buffer(&self->ctx, buffer, length);
break;
case AES_MODE_CTR:
AES_CTR_xcrypt_buffer(&self->ctx, buffer, length);
break;
}
}