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mbedtls_chacha20_starts() function
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.
Syntax
int mbedtls_chacha20_starts(mbedtls_chacha20_context *ctx,
const unsigned char nonce[12],
uint32_t counter);
Return value
\c 0 on success. #MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if ctx or nonce is NULL.
Notes
A ChaCha20 context can be re-used with the same key by calling this function to change the nonce.
Related Functions
Found 4 other functions taking a ![]()
mbedtls_chacha20_context
argument:
Function
Description
This function encrypts or decrypts data. Since ChaCha20 is a stream cipher, the same operation is used for encrypting and decrypting data.
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.
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