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