From: Selva Nair <selva.n...@gmail.com>

Signed-off-by: Selva Nair <selva.n...@gmail.com>
---
 doc/management-notes.txt | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/doc/management-notes.txt b/doc/management-notes.txt
index a9ba18a..e2e8249 100644
--- a/doc/management-notes.txt
+++ b/doc/management-notes.txt
@@ -795,6 +795,36 @@ Base64 encoded output of RSA_private_encrypt() (OpenSSL) 
or mbedtls_pk_sign()
 This capability is intended to allow the use of arbitrary cryptographic
 service providers with OpenVPN via the management interface.
 
+COMMAND -- ecdsa-sig (OpenVPN 2.5 or higher)
+------------------------------------------
+Same as rsa-sig but for EC keys: requires openssl 1.1
+
+Provides support for external storage of the EC private key. Requires the
+--management-external-key option. This option can be used instead of "key"
+in client mode, and allows the client to run without the need to load the
+actual private key. When the SSL protocol needs to perform a sign
+operation, the data to be signed will be sent to the management interface
+via a notification as follows:
+
+>ECDSA_SIGN:[BASE64_DATA]
+
+The management interface client should then create a DER encoded signature of
+the (decoded) BASE64_DATA using the private key and return the SSL signature as
+follows:
+
+ecdsa-sig
+[BASE64_SIG_LINE]
+.
+.
+.
+END
+
+Base64 encoded output of ECDSA_sign() (OpenSSL) or mbedtls_pk_sign()
+(mbed TLS) will provide a correct signature.
+
+This capability is intended to allow the use of arbitrary cryptographic
+service providers with OpenVPN via the management interface.
+
 COMMAND -- certificate (OpenVPN 2.4 or higher)
 ----------------------------------------------
 Provides support for external storage of the certificate. Requires the
-- 
2.1.4


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