mbedtls_gcm_finish() function

The GCM context. This must be initialized.

The buffer for holding the tag. This must be a readable buffer of at least \p tag_len Bytes.

The length of the tag to generate. This must be at least four.

This function associates a GCM context with a cipher algorithm and a key.

This function performs GCM encryption or decryption of a buffer. \warning When this function performs a decryption, it outputs the authentication tag and does not verify that the data is authentic. You should use this function to perform encryption only. For decryption, use mbedtls_gcm_auth_decrypt() instead.

This function starts a GCM encryption or decryption operation.

This function feeds an input buffer into an ongoing GCM encryption or decryption operation. ` The function expects input to be a multiple of 16 Bytes. Only the last call before calling mbedtls_gcm_finish() can be less than 16 Bytes.

This function initializes the specified GCM context, to make references valid, and prepares the context for mbedtls_gcm_setkey() or mbedtls_gcm_free(). The function does not bind the GCM context to a particular cipher, nor set the key. For this purpose, use mbedtls_gcm_setkey().

This function performs a GCM authenticated decryption of a buffer.

This function clears a GCM context and the underlying cipher sub-context.