[libcamera-devel,1/2] libcamera: Make IPA module signing optional
diff mbox series

Message ID 20200415193719.783-1-laurent.pinchart@ideasonboard.com
State Accepted
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Series
  • [libcamera-devel,1/2] libcamera: Make IPA module signing optional
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Commit Message

Laurent Pinchart April 15, 2020, 7:37 p.m. UTC 
The IPA module signing mechanism relies on openssl to generate keys and
sign the module. If openssl is not found on the system, the build will
fail. Make the dependency optional by detecting openssl, and skip
generation of signatures if openssl isn't found.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 src/ipa/meson.build                 |  4 +++-
 src/ipa/rkisp1/meson.build          | 14 ++++++++------
 src/ipa/vimc/meson.build            | 14 ++++++++------
 src/libcamera/include/ipa_manager.h |  2 ++
 src/libcamera/ipa_manager.cpp       |  4 ++++
 src/libcamera/ipa_pub_key.cpp.in    |  4 +++-
 src/libcamera/meson.build           | 16 +++++++++-------
 src/meson.build                     | 15 +++++++++++----
 8 files changed, 48 insertions(+), 25 deletions(-)

Comments

Kieran Bingham April 16, 2020, 12:16 p.m. UTC | #1 
Hi Laurent,

On 15/04/2020 20:37, Laurent Pinchart wrote:
> The IPA module signing mechanism relies on openssl to generate keys and
> sign the module. If openssl is not found on the system, the build will
> fail. Make the dependency optional by detecting openssl, and skip
> generation of signatures if openssl isn't found.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

If I had more time I might play around with different options here - but
given this works ... lets get it in and move on.

Some small notes and possible options below but:

Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>


> ---
>  src/ipa/meson.build                 |  4 +++-
>  src/ipa/rkisp1/meson.build          | 14 ++++++++------
>  src/ipa/vimc/meson.build            | 14 ++++++++------
>  src/libcamera/include/ipa_manager.h |  2 ++
>  src/libcamera/ipa_manager.cpp       |  4 ++++
>  src/libcamera/ipa_pub_key.cpp.in    |  4 +++-
>  src/libcamera/meson.build           | 16 +++++++++-------
>  src/meson.build                     | 15 +++++++++++----
>  8 files changed, 48 insertions(+), 25 deletions(-)
> 
> diff --git a/src/ipa/meson.build b/src/ipa/meson.build
> index cb4e3ab3388f..96d3ce79ffe9 100644
> --- a/src/ipa/meson.build
> +++ b/src/ipa/meson.build
> @@ -10,7 +10,9 @@ config_h.set('IPA_MODULE_DIR',
>  
>  subdir('libipa')
>  
> -ipa_sign = find_program('ipa-sign.sh')
> +if ipa_sign_module
> +    ipa_sign = find_program('ipa-sign.sh')
> +endif

This file will exist regardless, so making this conditional on
ipa_sign_module feels like clutter.

Sure it might not be used though ... Does meson complain if a variable
is defined but not used?


>  ipas = ['rkisp1', 'vimc']
>  
> diff --git a/src/ipa/rkisp1/meson.build b/src/ipa/rkisp1/meson.build
> index 6ccadcfbbe64..247d0429b49c 100644
> --- a/src/ipa/rkisp1/meson.build
> +++ b/src/ipa/rkisp1/meson.build
> @@ -9,9 +9,11 @@ mod = shared_module(ipa_name,
>                      install : true,
>                      install_dir : ipa_install_dir)
>  
> -custom_target(ipa_name + '.so.sign',
> -              input : mod,
> -              output : ipa_name + '.so.sign',
> -              command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
> -              install : true,
> -              install_dir : ipa_install_dir)
> +if ipa_sign_module
> +    custom_target(ipa_name + '.so.sign',
> +                  input : mod,
> +                  output : ipa_name + '.so.sign',
> +                  command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
> +                  install : true,
> +                  install_dir : ipa_install_dir)
> +endif
> diff --git a/src/ipa/vimc/meson.build b/src/ipa/vimc/meson.build
> index 3c932aa7aaad..a354096d8496 100644
> --- a/src/ipa/vimc/meson.build
> +++ b/src/ipa/vimc/meson.build
> @@ -9,9 +9,11 @@ mod = shared_module(ipa_name,
>                      install : true,
>                      install_dir : ipa_install_dir)
>  
> -custom_target(ipa_name + '.so.sign',
> -              input : mod,
> -              output : ipa_name + '.so.sign',
> -              command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
> -              install : true,
> -              install_dir : ipa_install_dir)
> +if ipa_sign_module
> +    custom_target(ipa_name + '.so.sign',
> +                  input : mod,
> +                  output : ipa_name + '.so.sign',
> +                  command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
> +                  install : true,
> +                  install_dir : ipa_install_dir)
> +endif
> diff --git a/src/libcamera/include/ipa_manager.h b/src/libcamera/include/ipa_manager.h
> index 0b5fd2ac1f12..6165efb8b145 100644
> --- a/src/libcamera/include/ipa_manager.h
> +++ b/src/libcamera/include/ipa_manager.h
> @@ -40,8 +40,10 @@ private:
>  
>  	bool isSignatureValid(IPAModule *ipa) const;
>  
> +#if HAVE_IPA_PUBKEY

I wonder if this could be 'cleaner' using the linker and weak symbols or
such ... but that would take time we don't have to play around with...
so this should be ok.

It's all internal, so it's not going to affect any ABI I don't believe.


>  	static const uint8_t publicKeyData_[];
>  	static const PubKey pubKey_;
> +#endif
>  };
>  
>  } /* namespace libcamera */
> diff --git a/src/libcamera/ipa_manager.cpp b/src/libcamera/ipa_manager.cpp
> index 7de1404eebdd..50b6792d6cce 100644
> --- a/src/libcamera/ipa_manager.cpp
> +++ b/src/libcamera/ipa_manager.cpp
> @@ -304,6 +304,7 @@ std::unique_ptr<IPAInterface> IPAManager::createIPA(PipelineHandler *pipe,
>  
>  bool IPAManager::isSignatureValid(IPAModule *ipa) const
>  {
> +#if HAVE_IPA_PUBKEY
>  	File file{ ipa->path() };
>  	if (!file.open(File::ReadOnly))
>  		return false;
> @@ -319,6 +320,9 @@ bool IPAManager::isSignatureValid(IPAModule *ipa) const
>  		<< (valid ? "valid" : "not valid");
>  
>  	return valid;
> +#else
> +	return false;
> +#endif
>  }
>  
>  } /* namespace libcamera */
> diff --git a/src/libcamera/ipa_pub_key.cpp.in b/src/libcamera/ipa_pub_key.cpp.in
> index e1fe287c160e..7ffc1e24d67b 100644
> --- a/src/libcamera/ipa_pub_key.cpp.in
> +++ b/src/libcamera/ipa_pub_key.cpp.in
> @@ -2,7 +2,7 @@
>  /*
>   * Copyright (C) 2020, Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>   *
> - * ipa_key.cpp - IPA module signing public key
> + * ipa_pub_key.cpp - IPA module signing public key

Unrelated change, but keep it.


>   *
>   * This file is auto-generated. Do not edit.
>   */
> @@ -11,10 +11,12 @@
>  
>  namespace libcamera {
>  
> +#if HAVE_IPA_PUBKEY
>  const uint8_t IPAManager::publicKeyData_[] = {
>  	${ipa_key}
>  };
>  
>  const PubKey IPAManager::pubKey_{ { IPAManager::publicKeyData_ } };
> +#endif
>  
>  } /* namespace libcamera */
> diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
> index c502450c4b2d..dcd2fb4900e6 100644
> --- a/src/libcamera/meson.build
> +++ b/src/libcamera/meson.build
> @@ -101,13 +101,15 @@ version_cpp = vcs_tag(command : [gen_version, meson.build_root()],
>  
>  libcamera_sources += version_cpp
>  
> -gen_ipa_pub_key = files('gen-ipa-pub-key.py')
> -ipa_pub_key_cpp = custom_target('ipa_pub_key_cpp',
> -                                input : [ ipa_priv_key, 'ipa_pub_key.cpp.in' ],
> -                                output : 'ipa_pub_key.cpp',
> -                                command : [ gen_ipa_pub_key, '@INPUT@', '@OUTPUT@' ])
> -
> -libcamera_sources += ipa_pub_key_cpp
> +if ipa_sign_module
> +    gen_ipa_pub_key = files('gen-ipa-pub-key.py')
> +    ipa_pub_key_cpp = custom_target('ipa_pub_key_cpp',
> +                                    input : [ ipa_priv_key, 'ipa_pub_key.cpp.in' ],
> +                                    output : 'ipa_pub_key.cpp',
> +                                    command : [ gen_ipa_pub_key, '@INPUT@', '@OUTPUT@' ])
> +
> +    libcamera_sources += ipa_pub_key_cpp
> +endif
>  
>  libcamera_deps = [
>      libatomic,
> diff --git a/src/meson.build b/src/meson.build
> index dc0e0c82b900..296682758613 100644
> --- a/src/meson.build
> +++ b/src/meson.build
> @@ -2,10 +2,17 @@ if get_option('android')
>      subdir('android')
>  endif
>  
> -ipa_gen_priv_key = find_program('ipa/gen-ipa-priv-key.sh')
> -ipa_priv_key = custom_target('ipa-priv-key',
> -                             output : [ 'ipa-priv-key.pem' ],
> -                             command : [ ipa_gen_priv_key, '@OUTPUT@' ])
> +openssl = find_program('openssl', required : false)


> +if openssl.found()

I'd be tempted to make this also dependant upon whether the gnutls was
found or not, as if we can't validate the key - there's not much point
in signing it ...

> +    ipa_gen_priv_key = find_program('ipa/gen-ipa-priv-key.sh')
> +    ipa_priv_key = custom_target('ipa-priv-key',
> +                                 output : [ 'ipa-priv-key.pem' ],
> +                                 command : [ ipa_gen_priv_key, '@OUTPUT@' ])
> +    config_h.set('HAVE_IPA_PUBKEY', 1)
> +    ipa_sign_module = true
> +else
> +    ipa_sign_module = false
> +endif
>  
>  subdir('libcamera')
>  subdir('ipa')
>
Laurent Pinchart April 16, 2020, 2:36 p.m. UTC | #2 
Hi Kieran,

On Thu, Apr 16, 2020 at 01:16:01PM +0100, Kieran Bingham wrote:
> On 15/04/2020 20:37, Laurent Pinchart wrote:
> > The IPA module signing mechanism relies on openssl to generate keys and
> > sign the module. If openssl is not found on the system, the build will
> > fail. Make the dependency optional by detecting openssl, and skip
> > generation of signatures if openssl isn't found.
> > 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
> If I had more time I might play around with different options here - but
> given this works ... lets get it in and move on.
> 
> Some small notes and possible options below but:
> 
> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
> 
> > ---
> >  src/ipa/meson.build                 |  4 +++-
> >  src/ipa/rkisp1/meson.build          | 14 ++++++++------
> >  src/ipa/vimc/meson.build            | 14 ++++++++------
> >  src/libcamera/include/ipa_manager.h |  2 ++
> >  src/libcamera/ipa_manager.cpp       |  4 ++++
> >  src/libcamera/ipa_pub_key.cpp.in    |  4 +++-
> >  src/libcamera/meson.build           | 16 +++++++++-------
> >  src/meson.build                     | 15 +++++++++++----
> >  8 files changed, 48 insertions(+), 25 deletions(-)
> > 
> > diff --git a/src/ipa/meson.build b/src/ipa/meson.build
> > index cb4e3ab3388f..96d3ce79ffe9 100644
> > --- a/src/ipa/meson.build
> > +++ b/src/ipa/meson.build
> > @@ -10,7 +10,9 @@ config_h.set('IPA_MODULE_DIR',
> >  
> >  subdir('libipa')
> >  
> > -ipa_sign = find_program('ipa-sign.sh')
> > +if ipa_sign_module
> > +    ipa_sign = find_program('ipa-sign.sh')
> > +endif
> 
> This file will exist regardless, so making this conditional on
> ipa_sign_module feels like clutter.
> 
> Sure it might not be used though ... Does meson complain if a variable
> is defined but not used?

It doesn't, so I'll fix this.

> >  ipas = ['rkisp1', 'vimc']
> >  
> > diff --git a/src/ipa/rkisp1/meson.build b/src/ipa/rkisp1/meson.build
> > index 6ccadcfbbe64..247d0429b49c 100644
> > --- a/src/ipa/rkisp1/meson.build
> > +++ b/src/ipa/rkisp1/meson.build
> > @@ -9,9 +9,11 @@ mod = shared_module(ipa_name,
> >                      install : true,
> >                      install_dir : ipa_install_dir)
> >  
> > -custom_target(ipa_name + '.so.sign',
> > -              input : mod,
> > -              output : ipa_name + '.so.sign',
> > -              command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
> > -              install : true,
> > -              install_dir : ipa_install_dir)
> > +if ipa_sign_module
> > +    custom_target(ipa_name + '.so.sign',
> > +                  input : mod,
> > +                  output : ipa_name + '.so.sign',
> > +                  command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
> > +                  install : true,
> > +                  install_dir : ipa_install_dir)
> > +endif
> > diff --git a/src/ipa/vimc/meson.build b/src/ipa/vimc/meson.build
> > index 3c932aa7aaad..a354096d8496 100644
> > --- a/src/ipa/vimc/meson.build
> > +++ b/src/ipa/vimc/meson.build
> > @@ -9,9 +9,11 @@ mod = shared_module(ipa_name,
> >                      install : true,
> >                      install_dir : ipa_install_dir)
> >  
> > -custom_target(ipa_name + '.so.sign',
> > -              input : mod,
> > -              output : ipa_name + '.so.sign',
> > -              command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
> > -              install : true,
> > -              install_dir : ipa_install_dir)
> > +if ipa_sign_module
> > +    custom_target(ipa_name + '.so.sign',
> > +                  input : mod,
> > +                  output : ipa_name + '.so.sign',
> > +                  command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
> > +                  install : true,
> > +                  install_dir : ipa_install_dir)
> > +endif
> > diff --git a/src/libcamera/include/ipa_manager.h b/src/libcamera/include/ipa_manager.h
> > index 0b5fd2ac1f12..6165efb8b145 100644
> > --- a/src/libcamera/include/ipa_manager.h
> > +++ b/src/libcamera/include/ipa_manager.h
> > @@ -40,8 +40,10 @@ private:
> >  
> >  	bool isSignatureValid(IPAModule *ipa) const;
> >  
> > +#if HAVE_IPA_PUBKEY
> 
> I wonder if this could be 'cleaner' using the linker and weak symbols or
> such ... but that would take time we don't have to play around with...
> so this should be ok.
> 
> It's all internal, so it's not going to affect any ABI I don't believe.

Weak symbols could be a good idea, yes. Let's explore it on top.

> >  	static const uint8_t publicKeyData_[];
> >  	static const PubKey pubKey_;
> > +#endif
> >  };
> >  
> >  } /* namespace libcamera */
> > diff --git a/src/libcamera/ipa_manager.cpp b/src/libcamera/ipa_manager.cpp
> > index 7de1404eebdd..50b6792d6cce 100644
> > --- a/src/libcamera/ipa_manager.cpp
> > +++ b/src/libcamera/ipa_manager.cpp
> > @@ -304,6 +304,7 @@ std::unique_ptr<IPAInterface> IPAManager::createIPA(PipelineHandler *pipe,
> >  
> >  bool IPAManager::isSignatureValid(IPAModule *ipa) const
> >  {
> > +#if HAVE_IPA_PUBKEY
> >  	File file{ ipa->path() };
> >  	if (!file.open(File::ReadOnly))
> >  		return false;
> > @@ -319,6 +320,9 @@ bool IPAManager::isSignatureValid(IPAModule *ipa) const
> >  		<< (valid ? "valid" : "not valid");
> >  
> >  	return valid;
> > +#else
> > +	return false;
> > +#endif
> >  }
> >  
> >  } /* namespace libcamera */
> > diff --git a/src/libcamera/ipa_pub_key.cpp.in b/src/libcamera/ipa_pub_key.cpp.in
> > index e1fe287c160e..7ffc1e24d67b 100644
> > --- a/src/libcamera/ipa_pub_key.cpp.in
> > +++ b/src/libcamera/ipa_pub_key.cpp.in
> > @@ -2,7 +2,7 @@
> >  /*
> >   * Copyright (C) 2020, Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> >   *
> > - * ipa_key.cpp - IPA module signing public key
> > + * ipa_pub_key.cpp - IPA module signing public key
> 
> Unrelated change, but keep it.

I forgot to mention it in the commit message, sorry.

> >   *
> >   * This file is auto-generated. Do not edit.
> >   */
> > @@ -11,10 +11,12 @@
> >  
> >  namespace libcamera {
> >  
> > +#if HAVE_IPA_PUBKEY
> >  const uint8_t IPAManager::publicKeyData_[] = {
> >  	${ipa_key}
> >  };
> >  
> >  const PubKey IPAManager::pubKey_{ { IPAManager::publicKeyData_ } };
> > +#endif
> >  
> >  } /* namespace libcamera */
> > diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
> > index c502450c4b2d..dcd2fb4900e6 100644
> > --- a/src/libcamera/meson.build
> > +++ b/src/libcamera/meson.build
> > @@ -101,13 +101,15 @@ version_cpp = vcs_tag(command : [gen_version, meson.build_root()],
> >  
> >  libcamera_sources += version_cpp
> >  
> > -gen_ipa_pub_key = files('gen-ipa-pub-key.py')
> > -ipa_pub_key_cpp = custom_target('ipa_pub_key_cpp',
> > -                                input : [ ipa_priv_key, 'ipa_pub_key.cpp.in' ],
> > -                                output : 'ipa_pub_key.cpp',
> > -                                command : [ gen_ipa_pub_key, '@INPUT@', '@OUTPUT@' ])
> > -
> > -libcamera_sources += ipa_pub_key_cpp
> > +if ipa_sign_module
> > +    gen_ipa_pub_key = files('gen-ipa-pub-key.py')
> > +    ipa_pub_key_cpp = custom_target('ipa_pub_key_cpp',
> > +                                    input : [ ipa_priv_key, 'ipa_pub_key.cpp.in' ],
> > +                                    output : 'ipa_pub_key.cpp',
> > +                                    command : [ gen_ipa_pub_key, '@INPUT@', '@OUTPUT@' ])
> > +
> > +    libcamera_sources += ipa_pub_key_cpp
> > +endif
> >  
> >  libcamera_deps = [
> >      libatomic,
> > diff --git a/src/meson.build b/src/meson.build
> > index dc0e0c82b900..296682758613 100644
> > --- a/src/meson.build
> > +++ b/src/meson.build
> > @@ -2,10 +2,17 @@ if get_option('android')
> >      subdir('android')
> >  endif
> >  
> > -ipa_gen_priv_key = find_program('ipa/gen-ipa-priv-key.sh')
> > -ipa_priv_key = custom_target('ipa-priv-key',
> > -                             output : [ 'ipa-priv-key.pem' ],
> > -                             command : [ ipa_gen_priv_key, '@OUTPUT@' ])
> > +openssl = find_program('openssl', required : false)
> 
> 
> > +if openssl.found()
> 
> I'd be tempted to make this also dependant upon whether the gnutls was
> found or not, as if we can't validate the key - there's not much point
> in signing it ...

I agree they should be bundled. However, there are more options than
openssl and gnutls that we probably want to look into. Or maybe look
into how to use certtool from gnutls on the host side, and openssl on
the target side, to have more options for users. I thus expect this to
be reworked at that time.

> > +    ipa_gen_priv_key = find_program('ipa/gen-ipa-priv-key.sh')
> > +    ipa_priv_key = custom_target('ipa-priv-key',
> > +                                 output : [ 'ipa-priv-key.pem' ],
> > +                                 command : [ ipa_gen_priv_key, '@OUTPUT@' ])
> > +    config_h.set('HAVE_IPA_PUBKEY', 1)
> > +    ipa_sign_module = true
> > +else
> > +    ipa_sign_module = false
> > +endif
> >  
> >  subdir('libcamera')
> >  subdir('ipa')

Patch
diff mbox series 

diff --git a/src/ipa/meson.build b/src/ipa/meson.build
index cb4e3ab3388f..96d3ce79ffe9 100644
--- a/src/ipa/meson.build
+++ b/src/ipa/meson.build
@@ -10,7 +10,9 @@  config_h.set('IPA_MODULE_DIR',
 
 subdir('libipa')
 
-ipa_sign = find_program('ipa-sign.sh')
+if ipa_sign_module
+    ipa_sign = find_program('ipa-sign.sh')
+endif
 
 ipas = ['rkisp1', 'vimc']
 
diff --git a/src/ipa/rkisp1/meson.build b/src/ipa/rkisp1/meson.build
index 6ccadcfbbe64..247d0429b49c 100644
--- a/src/ipa/rkisp1/meson.build
+++ b/src/ipa/rkisp1/meson.build
@@ -9,9 +9,11 @@  mod = shared_module(ipa_name,
                     install : true,
                     install_dir : ipa_install_dir)
 
-custom_target(ipa_name + '.so.sign',
-              input : mod,
-              output : ipa_name + '.so.sign',
-              command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
-              install : true,
-              install_dir : ipa_install_dir)
+if ipa_sign_module
+    custom_target(ipa_name + '.so.sign',
+                  input : mod,
+                  output : ipa_name + '.so.sign',
+                  command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
+                  install : true,
+                  install_dir : ipa_install_dir)
+endif
diff --git a/src/ipa/vimc/meson.build b/src/ipa/vimc/meson.build
index 3c932aa7aaad..a354096d8496 100644
--- a/src/ipa/vimc/meson.build
+++ b/src/ipa/vimc/meson.build
@@ -9,9 +9,11 @@  mod = shared_module(ipa_name,
                     install : true,
                     install_dir : ipa_install_dir)
 
-custom_target(ipa_name + '.so.sign',
-              input : mod,
-              output : ipa_name + '.so.sign',
-              command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
-              install : true,
-              install_dir : ipa_install_dir)
+if ipa_sign_module
+    custom_target(ipa_name + '.so.sign',
+                  input : mod,
+                  output : ipa_name + '.so.sign',
+                  command : [ ipa_sign, ipa_priv_key, '@INPUT@', '@OUTPUT@' ],
+                  install : true,
+                  install_dir : ipa_install_dir)
+endif
diff --git a/src/libcamera/include/ipa_manager.h b/src/libcamera/include/ipa_manager.h
index 0b5fd2ac1f12..6165efb8b145 100644
--- a/src/libcamera/include/ipa_manager.h
+++ b/src/libcamera/include/ipa_manager.h
@@ -40,8 +40,10 @@  private:
 
 	bool isSignatureValid(IPAModule *ipa) const;
 
+#if HAVE_IPA_PUBKEY
 	static const uint8_t publicKeyData_[];
 	static const PubKey pubKey_;
+#endif
 };
 
 } /* namespace libcamera */
diff --git a/src/libcamera/ipa_manager.cpp b/src/libcamera/ipa_manager.cpp
index 7de1404eebdd..50b6792d6cce 100644
--- a/src/libcamera/ipa_manager.cpp
+++ b/src/libcamera/ipa_manager.cpp
@@ -304,6 +304,7 @@  std::unique_ptr<IPAInterface> IPAManager::createIPA(PipelineHandler *pipe,
 
 bool IPAManager::isSignatureValid(IPAModule *ipa) const
 {
+#if HAVE_IPA_PUBKEY
 	File file{ ipa->path() };
 	if (!file.open(File::ReadOnly))
 		return false;
@@ -319,6 +320,9 @@  bool IPAManager::isSignatureValid(IPAModule *ipa) const
 		<< (valid ? "valid" : "not valid");
 
 	return valid;
+#else
+	return false;
+#endif
 }
 
 } /* namespace libcamera */
diff --git a/src/libcamera/ipa_pub_key.cpp.in b/src/libcamera/ipa_pub_key.cpp.in
index e1fe287c160e..7ffc1e24d67b 100644
--- a/src/libcamera/ipa_pub_key.cpp.in
+++ b/src/libcamera/ipa_pub_key.cpp.in
@@ -2,7 +2,7 @@ 
 /*
  * Copyright (C) 2020, Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  *
- * ipa_key.cpp - IPA module signing public key
+ * ipa_pub_key.cpp - IPA module signing public key
  *
  * This file is auto-generated. Do not edit.
  */
@@ -11,10 +11,12 @@ 
 
 namespace libcamera {
 
+#if HAVE_IPA_PUBKEY
 const uint8_t IPAManager::publicKeyData_[] = {
 	${ipa_key}
 };
 
 const PubKey IPAManager::pubKey_{ { IPAManager::publicKeyData_ } };
+#endif
 
 } /* namespace libcamera */
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index c502450c4b2d..dcd2fb4900e6 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -101,13 +101,15 @@  version_cpp = vcs_tag(command : [gen_version, meson.build_root()],
 
 libcamera_sources += version_cpp
 
-gen_ipa_pub_key = files('gen-ipa-pub-key.py')
-ipa_pub_key_cpp = custom_target('ipa_pub_key_cpp',
-                                input : [ ipa_priv_key, 'ipa_pub_key.cpp.in' ],
-                                output : 'ipa_pub_key.cpp',
-                                command : [ gen_ipa_pub_key, '@INPUT@', '@OUTPUT@' ])
-
-libcamera_sources += ipa_pub_key_cpp
+if ipa_sign_module
+    gen_ipa_pub_key = files('gen-ipa-pub-key.py')
+    ipa_pub_key_cpp = custom_target('ipa_pub_key_cpp',
+                                    input : [ ipa_priv_key, 'ipa_pub_key.cpp.in' ],
+                                    output : 'ipa_pub_key.cpp',
+                                    command : [ gen_ipa_pub_key, '@INPUT@', '@OUTPUT@' ])
+
+    libcamera_sources += ipa_pub_key_cpp
+endif
 
 libcamera_deps = [
     libatomic,
diff --git a/src/meson.build b/src/meson.build
index dc0e0c82b900..296682758613 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -2,10 +2,17 @@  if get_option('android')
     subdir('android')
 endif
 
-ipa_gen_priv_key = find_program('ipa/gen-ipa-priv-key.sh')
-ipa_priv_key = custom_target('ipa-priv-key',
-                             output : [ 'ipa-priv-key.pem' ],
-                             command : [ ipa_gen_priv_key, '@OUTPUT@' ])
+openssl = find_program('openssl', required : false)
+if openssl.found()
+    ipa_gen_priv_key = find_program('ipa/gen-ipa-priv-key.sh')
+    ipa_priv_key = custom_target('ipa-priv-key',
+                                 output : [ 'ipa-priv-key.pem' ],
+                                 command : [ ipa_gen_priv_key, '@OUTPUT@' ])
+    config_h.set('HAVE_IPA_PUBKEY', 1)
+    ipa_sign_module = true
+else
+    ipa_sign_module = false
+endif
 
 subdir('libcamera')
 subdir('ipa')