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SourceVuESP-IDF Framework and ExamplesmbedTLSesp_aes_crypt_cfb8()

esp_aes_crypt_cfb8() function

AES-CFB8 buffer encryption/decryption. Note: Due to the nature of CFB you should use the same key schedule for both encryption and decryption. So a context initialized with esp_aes_setkey_enc() for both AES_ENCRYPT and AES_DECRYPT.

Syntax

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Summary

Declaration

Definition

from aes.h:434

int mbedtls_aes_crypt_cfb8(mbedtls_aes_context *ctx, int mode, size_t length, unsigned char iv[16], const unsigned char *input, unsigned char *output);

Implemented in esp_aes.c:406

Arguments

Argument

Declared as

Description

ctx

mbedtls_aes_context *

AES context

mode

int

AES_ENCRYPT or AES_DECRYPT

length

size_t

length of the input data

unsigned char[16]

initialization vector (updated after use)

input

const unsigned char *

buffer holding the input data

output

unsigned char *

buffer holding the output data

Return value

0 if successful

Notes

Upon exit, the content of the IV is updated so that you can call the function same function again on the following block(s) of data and get the same result as if it was encrypted in one call. This allows a "streaming" usage. If on the other hand you need to retain the contents of the IV, you should either save it manually or use the cipher module instead.

Examples

References

from examples

esp_aes_crypt_cfb8() function

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esp_aes_crypt_cfb8() function

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Arguments

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Notes

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