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Return an error for IV lengths other than 12 with ChaCha20

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The implementation was silently overwriting the IV length to 12
even though the caller passed a different value.
Change the behavior to signal that a different length is not supported.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek
2021-12-01 21:58:05 +01:00
parent ce8a6173f7
commit 33ca6af8a3
3 changed files with 67 additions and 0 deletions
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6
library/cipher.c
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@ -386,6 +386,12 @@ int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
#if defined(MBEDTLS_CHACHA20_C)
if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20 )
{
/* Even though the actual_iv_size is overwritten with a correct value
* of 12 from the cipher info, return an error to indicate that
* the input iv_len is wrong. */
if( iv_len != 12 )
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
if ( 0 != mbedtls_chacha20_starts( (mbedtls_chacha20_context*)ctx->cipher_ctx,
iv,
0U ) ) /* Initial counter value */