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Return an error for IV lengths other than 12 with ChaCha20+Poly1305

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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
2021-12-02 09:31:58 +01:00
parent 5375fd9a3f
commit d353043380
3 changed files with 36 additions and 3 deletions
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5
library/cipher.c
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@@ -399,6 +399,11 @@ int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
}
}
#if defined(MBEDTLS_CHACHAPOLY_C)
if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 &&
iv_len != 12 )
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
#endif
#endif
if ( actual_iv_size != 0 )