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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-08-07 01:26:41 +0300
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-08-09 16:05:58 +0300
commit12f48aa65e45a50bba6df07db56b77ccfbdb3f77 (patch)
treed8f999f6f33c06b3d220e0d4dfb5dfae00f68607 /src/libcamera
parentbedef55d95006e13d51a12f4e8eb3ab9ee3aaa4e (diff)
libcamera: pub_key: Support openssl as an alternative to gnutls
Support verify IPA signatures with openssl as an alternative to gnutls, to offer more flexibility in the selection of dependencies. Use gnutls by default, for no specific reason as both are equally well supported. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: Eric Curtin <ecurtin@redhat.com> Reviewed-by: Eric Curtin <ecurtin@redhat.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'src/libcamera')
-rw-r--r--src/libcamera/meson.build10
-rw-r--r--src/libcamera/pub_key.cpp47
2 files changed, 50 insertions, 7 deletions
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index 7cc06de4..1f02494a 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -65,12 +65,16 @@ subdir('pipeline')
subdir('proxy')
libdl = cc.find_library('dl')
-libgnutls = dependency('gnutls', required : true)
libudev = dependency('libudev', required : false)
libyaml = dependency('yaml-0.1', required : false)
-if libgnutls.found()
+# Use one of gnutls or libcrypto (provided by OpenSSL), trying gnutls first.
+libcrypto = dependency('gnutls', required : false)
+if libcrypto.found()
config_h.set('HAVE_GNUTLS', 1)
+else
+ libcrypto = dependency('libcrypto', required : true)
+ config_h.set('HAVE_CRYPTO', 1)
endif
if liblttng.found()
@@ -135,8 +139,8 @@ libcamera_deps = [
libatomic,
libcamera_base,
libcamera_base_private,
+ libcrypto,
libdl,
- libgnutls,
liblttng,
libudev,
libyaml,
diff --git a/src/libcamera/pub_key.cpp b/src/libcamera/pub_key.cpp
index b2045a10..64dfa234 100644
--- a/src/libcamera/pub_key.cpp
+++ b/src/libcamera/pub_key.cpp
@@ -7,7 +7,12 @@
#include "libcamera/internal/pub_key.h"
-#if HAVE_GNUTLS
+#if HAVE_CRYPTO
+#include <openssl/evp.h>
+#include <openssl/rsa.h>
+#include <openssl/sha.h>
+#include <openssl/x509.h>
+#elif HAVE_GNUTLS
#include <gnutls/abstract.h>
#endif
@@ -33,7 +38,14 @@ namespace libcamera {
PubKey::PubKey([[maybe_unused]] Span<const uint8_t> key)
: valid_(false)
{
-#if HAVE_GNUTLS
+#if HAVE_CRYPTO
+ const uint8_t *data = key.data();
+ pubkey_ = d2i_PUBKEY(nullptr, &data, key.size());
+ if (!pubkey_)
+ return;
+
+ valid_ = true;
+#elif HAVE_GNUTLS
int ret = gnutls_pubkey_init(&pubkey_);
if (ret < 0)
return;
@@ -52,7 +64,9 @@ PubKey::PubKey([[maybe_unused]] Span<const uint8_t> key)
PubKey::~PubKey()
{
-#if HAVE_GNUTLS
+#if HAVE_CRYPTO
+ EVP_PKEY_free(pubkey_);
+#elif HAVE_GNUTLS
gnutls_pubkey_deinit(pubkey_);
#endif
}
@@ -79,7 +93,32 @@ bool PubKey::verify([[maybe_unused]] Span<const uint8_t> data,
if (!valid_)
return false;
-#if HAVE_GNUTLS
+#if HAVE_CRYPTO
+ /*
+ * Create and initialize a public key algorithm context for signature
+ * verification.
+ */
+ EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(pubkey_, nullptr);
+ if (!ctx)
+ return false;
+
+ if (EVP_PKEY_verify_init(ctx) <= 0 ||
+ EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING) <= 0 ||
+ EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha256()) <= 0) {
+ EVP_PKEY_CTX_free(ctx);
+ return false;
+ }
+
+ /* Calculate the SHA256 digest of the data. */
+ uint8_t digest[SHA256_DIGEST_LENGTH];
+ SHA256(data.data(), data.size(), digest);
+
+ /* Decrypt the signature and verify it matches the digest. */
+ int ret = EVP_PKEY_verify(ctx, sig.data(), sig.size(), digest,
+ SHA256_DIGEST_LENGTH);
+ EVP_PKEY_CTX_free(ctx);
+ return ret == 1;
+#elif HAVE_GNUTLS
const gnutls_datum_t gnuTlsData{
const_cast<unsigned char *>(data.data()),
static_cast<unsigned int>(data.size())

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