---
name: "SSLeay"
section: "3ssl"
platform: "linux"
package: "libssl-doc"
version: "1.0.1t-1+deb8u8"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://carta.tech/man/OPENSSL_VERSION_NUMBER"
---

# SSLeay(3ssl)

get OpenSSL version number

Part of [OPENSSL\_VERSION\_NUMBER(3ssl)](/man/OPENSSL_VERSION_NUMBER/3ssl.md).

## NAME

OPENSSL\_VERSION\_NUMBER, SSLeay, SSLeay\_version - get OpenSSL version number

## SYNOPSIS

```
 #include <openssl/opensslv.h>
 #define OPENSSL_VERSION_NUMBER 0xnnnnnnnnnL
 #include <openssl/crypto.h>
 long SSLeay(void);
 const char *SSLeay_version(int t);
```

## DESCRIPTION

OPENSSL\_VERSION\_NUMBER is a numeric release version identifier:

```
 MMNNFFPPS: major minor fix patch status
```

The status nibble has one of the values 0 for development, 1 to e for betas 1 to 14, and f for release.

for example

```
 0x000906000 == 0.9.6 dev
 0x000906023 == 0.9.6b beta 3
 0x00090605f == 0.9.6e release
```

Versions prior to 0.9.3 have identifiers \< 0x0930. Versions between 0.9.3 and 0.9.5 had a version identifier with this interpretation:

```
 MMNNFFRBB major minor fix final beta/patch
```

for example

```
 0x000904100 == 0.9.4 release
 0x000905000 == 0.9.5 dev
```

Version 0.9.5a had an interim interpretation that is like the current one, except the patch level got the highest bit set, to keep continuity.  The number was therefore 0x0090581f.

For backward compatibility, SSLEAY\_VERSION\_NUMBER is also defined.

*SSLeay()* returns this number. The return value can be compared to the macro to make sure that the correct version of the library has been loaded, especially when using DLLs on Windows systems.

*SSLeay\_version()* returns different strings depending on **t**:

- SSLEAY\_VERSION

  The text variant of the version number and the release date.  For example, "OpenSSL 0.9.5a 1 Apr 2000".

- SSLEAY\_CFLAGS

  The compiler flags set for the compilation process in the form "compiler: ..."  if available or "compiler: information not available" otherwise.

- SSLEAY\_BUILT\_ON

  The date of the build process in the form "built on: ..." if available or "built on: date not available" otherwise.

- SSLEAY\_PLATFORM

  The "Configure" target of the library build in the form "platform: ..." if available or "platform: information not available" otherwise.

- SSLEAY\_DIR

  The "OPENSSLDIR" setting of the library build in the form "OPENSSLDIR: "..."" if available or "OPENSSLDIR: N/A" otherwise.

For an unknown **t**, the text "not available" is returned.

## RETURN VALUE

The version number.

## SEE ALSO

[*crypto*(3)](/man/crypto/3.md)

## HISTORY

*SSLeay()* and SSLEAY\_VERSION\_NUMBER are available in all versions of SSLeay and OpenSSL. OPENSSL\_VERSION\_NUMBER is available in all versions of OpenSSL. **SSLEAY\_DIR** was added in OpenSSL 0.9.7.