ELF32\_CHECKSUM(3) Libelf Programmer's Manual ELF32\_CHECKSUM(3)

# [NAME](#NAME)

elf32\_checksum, elf64\_checksum - compute the checksum for a 32-bit or 64-bit ELF object file

# [SYNOPSIS](#SYNOPSIS)

```
#include <libelf.h>
long int elf32_checksum(Elf *elf);
long int elf64_checksum(Elf *elf);
```

# [DESCRIPTION](#DESCRIPTION)

Compute a checksum for the ELF object file referred to by *elf*. The checksum is computed from permanent parts of the ELF file and the result is repeatable. To be repeatable, strippable sections are not included in computing the checksum. **SHT\_NOBITS** sections are also not included when computing the checksum. The checksum can be used as a value for **DT\_CHECKSUM**.

# [PARAMETERS](#PARAMETERS)

[*elf*](#elf)

The ELF object file for which the checksum is to be computed.

# [RETURN VALUE](#RETURN_VALUE)

On success, return the computed checksum. If an error occurs, return -1 and set a libelf error code. The checksum is always calculated as a 4-byte value. If *long int* is larger than 4 bytes, then the checksum will be extended by padding with zeros.

# [SEE ALSO](#SEE_ALSO)

[**elf\_errno**(3)](/man/os/elfutils/elf_errno.3), [**libelf**(3)](/man/os/elfutils/libelf.3), [**elf**(5)](/man/os/elfutils/elf.5)

# [ATTRIBUTES](#ATTRIBUTES)

For an explanation of the terms used in this section, see [**attributes**(7)](/man/os/elfutils/attributes.7).

**Interface** **Attribute** **Value** elf32\_checksum (), elf64\_checksum () Thread safety MT-Safe

# [REPORTING BUGS](#REPORTING_BUGS)

Report bugs to &lt;elfutils-devel@sourceware.org&gt; or https://sourceware.org/bugzilla/.

2024-08-14 Libelf

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Document: elf64_checksum(3) from elfutils 0.196-r1 (Chainguard OS)
Source: https://sourceware.org/git/elfutils.git