1 files changed, 42 insertions, 0 deletions
diff --git a/CryptoPkg/Include/Library/BaseCryptLib.h b/CryptoPkg/Include/Library/BaseCryptLib.h
index 6183bb0df4..f9191f6e96 100644
--- a/CryptoPkg/Include/Library/BaseCryptLib.h
+++ b/CryptoPkg/Include/Library/BaseCryptLib.h
@@ -2594,6 +2594,48 @@ Pkcs7Verify (
   );
 
 /**
+  This function receives a PKCS7 formatted signature, and then verifies that
+  the specified Enhanced or Extended Key Usages (EKU's) are present in the end-entity
+  leaf signing certificate.
+  Note that this function does not validate the certificate chain.
+
+  Applications for custom EKU's are quite flexible. For example, a policy EKU
+  may be present in an Issuing Certificate Authority (CA), and any sub-ordinate
+  certificate issued might also contain this EKU, thus constraining the
+  sub-ordinate certificate.  Other applications might allow a certificate
+  embedded in a device to specify that other Object Identifiers (OIDs) are
+  present which contains binary data specifying custom capabilities that
+  the device is able to do.
+
+  @param[in]  Pkcs7Signature       The PKCS#7 signed information content block. An array
+                                   containing the content block with both the signature,
+                                   the signer's certificate, and any necessary intermediate
+                                   certificates.
+  @param[in]  Pkcs7SignatureSize   Number of bytes in Pkcs7Signature.
+  @param[in]  RequiredEKUs         Array of null-terminated strings listing OIDs of
+                                   required EKUs that must be present in the signature.
+  @param[in]  RequiredEKUsSize     Number of elements in the RequiredEKUs string array.
+  @param[in]  RequireAllPresent    If this is TRUE, then all of the specified EKU's
+                                   must be present in the leaf signer.  If it is
+                                   FALSE, then we will succeed if we find any
+                                   of the specified EKU's.
+
+  @retval EFI_SUCCESS              The required EKUs were found in the signature.
+  @retval EFI_INVALID_PARAMETER    A parameter was invalid.
+  @retval EFI_NOT_FOUND            One or more EKU's were not found in the signature.
+
+**/
+RETURN_STATUS
+EFIAPI
+VerifyEKUsInPkcs7Signature (
+  IN  CONST UINT8   *Pkcs7Signature,
+  IN  CONST UINT32  SignatureSize,
+  IN  CONST CHAR8   *RequiredEKUs[],
+  IN  CONST UINT32  RequiredEKUsSize,
+  IN  BOOLEAN       RequireAllPresent
+  );
+
+/**
   Extracts the attached content from a PKCS#7 signed data if existed. The input signed
   data could be wrapped in a ContentInfo structure.