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mbedtls_ct_memcpy_offset() function
Copy data from a secret position with constant flow. This function copies \p len bytes from \p src_base + \p offset_secret to \p dst, with a code flow and memory access pattern that does not depend on \p offset_secret, but only on \p offset_min, \p offset_max and \p len. Functionally equivalent to `memcpy(dst, src + offset_secret, len)`.
Syntax
void mbedtls_ct_memcpy_offset(unsigned char *dest,
const unsigned char *src,
size_t offset,
size_t offset_min,
size_t offset_max,
size_t len);
Implemented in ![]()
constant_time.c:381
Notes
This function reads from \p dest, but the value that is read does not influence the result and this function's behavior is well-defined regardless of the contents of the buffers. This may result in false positives from static or dynamic analyzers, especially if \p dest is not initialized.