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ChaCha20 (classic): Document that we only support 12-byte nonces

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine 2022-03-10 18:56:26 +01:00
parent fc47641e36
commit c50dec07b2
1 changed files with 6 additions and 0 deletions
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6
include/mbedtls/cipher.h
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@ -844,6 +844,12 @@ int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx,
* \note Some ciphers do not use IVs nor nonce. For these
* ciphers, this function has no effect.
*
* \note For #MBEDTLS_CIPHER_CHACHA20, the nonce length must
* be 12, and the initial counter value is 0.
*
* \note For #MBEDTLS_CIPHER_CHACHA20_POLY1305, the nonce length
* must be 12.
*
* \param ctx The generic cipher context. This must be initialized and
* bound to a cipher information structure.
* \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers. This