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esp_aes_gcm_auth_decrypt() function
This function performs a GCM authenticated decryption of a buffer.
Syntax
int mbedtls_gcm_auth_decrypt(mbedtls_gcm_context *ctx,
size_t length,
const unsigned char *iv,
size_t iv_len,
const unsigned char *add,
size_t add_len,
const unsigned char *tag,
size_t tag_len,
const unsigned char *input,
unsigned char *output);
Implemented in ![]()
esp_aes_gcm.c:753
Return value
0 if successful and authenticated. #MBEDTLS_ERR_GCM_AUTH_FAILED if the tag does not match.
Notes
For decryption, the output buffer cannot be the same as input buffer. If the buffers overlap, the output buffer must trail at least 8 Bytes behind the input buffer.
Related Functions
Found 14 other functions taking a ![]()
esp_gcm_context
argument:
Function
Description
This function clears a GCM context
This function feeds an input buffer into an ongoing GCM encryption or decryption operation. You may call this function zero, one or more times to pass successive parts of the input: the plaintext to encrypt, or the ciphertext (not including the tag) to decrypt. After the last part of the input, call mbedtls_gcm_finish(). This function may produce output in one of the following ways: - Immediate output: the output length is always equal to the input length. - Buffered output: the output consists of a whole number of 16-byte blocks. If the total input length so far (not including associated data) is 16 \* *B* + *A* with *A* < 16 then the total output length is 16 \* *B*. In particular: - It is always correct to call this function with \p output_size >= \p input_length + 15. - If \p input_length is a multiple of 16 for all the calls to this function during an operation, then it is correct to use \p output_size = \p input_length.
This function associates a GCM context with a key.
This function finishes the GCM operation and generates the authentication tag. It wraps up the GCM stream, and generates the tag. The tag can have a maximum length of 16 Bytes.
This function initializes the specified GCM context
This function performs GCM encryption or decryption of a buffer.
This function starts a GCM encryption or decryption operation.
This function feeds an input buffer as associated data (authenticated but not encrypted data) in a GCM encryption or decryption operation. Call this function after mbedtls_gcm_starts() to pass the associated data. If the associated data is empty, you do not need to call this function. You may not call this function after calling mbedtls_cipher_update().