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mbedtls_chacha20_update() function
This function encrypts or decrypts data. Since ChaCha20 is a stream cipher, the same operation is used for encrypting and decrypting data.
Syntax
int mbedtls_chacha20_update(mbedtls_chacha20_context *ctx,
size_t size,
const unsigned char *input,
unsigned char *output);
Return value
\c 0 on success. A negative error code on failure.
Notes
The \p input and \p output pointers must either be equal or point to non-overlapping buffers. \c mbedtls_chacha20_setkey() and \c mbedtls_chacha20_starts() must be called at least once to setup the context before this function can be called. This function can be called multiple times in a row in order to encrypt of decrypt data piecewise with the same key and nonce.
Related Functions
Found 4 other functions taking a ![]()
mbedtls_chacha20_context
argument:
Function
Description
This function initializes the specified ChaCha20 context. It must be the first API called before using the context. It is usually followed by calls to \c mbedtls_chacha20_setkey() and \c mbedtls_chacha20_starts(), then one or more calls to to \c mbedtls_chacha20_update(), and finally to \c mbedtls_chacha20_free().
This function releases and clears the specified ChaCha20 context.
This function sets the encryption/decryption key.
This function sets the nonce and initial counter value. \warning You must never use the same nonce twice with the same key. This would void any confidentiality guarantees for the messages encrypted with the same nonce and key.
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