# dkim_sig_getsignedhdrs()

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SYNOPSIS |
    #include <dkim.h>

    DKIM_STAT dkim_sig_getsignedhdrs(
    	DKIM *DKIM,
    	DKIM_SIGINFO *sig,
            unsigned char *hdrs,
    	size_t hdrlen,
            unsigned int *nhdrs
    );
Retrieve from a DKIM and signature handle the set of header fields that were included in the hashes of a valid signature.
DESCRIPTION |
Called When | `dkim_sig_getsignedhdrs()` can be called at any time after signature validation is completed via a call to `dkim_eom()` using a DKIM handle that was created by `dkim_verify()`. Only a signature that fully validated is acceptable.
ARGUMENTS |
Argument | Description
--- | ---
dkim | A message validation handle previously created using `dkim_verify()`.
sig | Signature-specific handle.
hdrs | An array of fixed-length character strings that should be filled by header fields that were included in this signature's header hash.
hdrlen | The number of bytes available in each element of the `hdrs` array.
nhdrs | This should contain a pointer to the number of elements available in the `hdrs` array. It will be updated to contain the number of header fields that were included in the signature. If insufficient array elements were available, the array will not be updated (but this value will) and an error code is returned. If temporary memory could not be acquired, this value will be set to zero and an error will be returned.
RETURN VALUES |
Value | Description
--- | ---
`DKIM_STAT_INTERNAL` | An internal error occurred.
`DKIM_STAT_NORESOURCE` | The `hdrs` array was too small to contain the result, or not enough temporary memory could be allocated. If on return from this function `nhdrs` contains 0, the latter occurred; otherwise, `nhdrs` will be updated to contain the size of the array needed to get all the data out.
NOTES | None.

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