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Add comment on impossible overflows

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Signed-off-by: Chien Wong <m@xv97.com>
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Chien Wong 2024-01-22 20:47:26 +08:00
parent bf4b5ed7a4
commit 858bc65d74
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1 changed files with 3 additions and 0 deletions
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library/gcm.c
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@ -542,6 +542,9 @@ int mbedtls_gcm_finish(mbedtls_gcm_context *ctx,
(void) output_size; (void) output_size;
*output_length = 0; *output_length = 0;
/* Total length is restricted to 2^39 - 256 bits, ie 2^36 - 2^5 bytes
* and AD length is restricted to 2^64 bits, ie 2^61 bytes so neither of
* the two multiplications would overflow. */
orig_len = ctx->len * 8; orig_len = ctx->len * 8;
orig_add_len = ctx->add_len * 8; orig_add_len = ctx->add_len * 8;