[PATCH v4 1/9] evmctl: Implement support for EVMCTL_KEY_PASSWORD environment variable

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If the user did not use the --pass option to provide a key password,
get the key password from the EVMCTL_KEY_PASSWORD environment variable.

Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
---
 README       | 4 ++++
 src/evmctl.c | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/README b/README
index 87cd3b5..1cc027f 100644
--- a/README
+++ b/README
@@ -70,6 +70,10 @@ OPTIONS
   -v                 increase verbosity level
   -h, --help         display this help and exit
 
+Environment variables:
+
+EVMCTL_KEY_PASSWORD  : Private key password to use; do not use --pass option
+
 
 INTRODUCTION
 ------------
diff --git a/src/evmctl.c b/src/evmctl.c
index a8065bb..58f8e66 100644
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -2530,6 +2530,9 @@ static void usage(void)
 		"      --ignore-violations ignore ToMToU measurement violations\n"
 		"  -v                 increase verbosity level\n"
 		"  -h, --help         display this help and exit\n"
+		"\n"
+		"Environment variables:\n\n"
+		"EVMCTL_KEY_PASSWORD  : Private key password to use; do not use --pass option\n"
 		"\n");
 }
 
@@ -2813,6 +2816,9 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	if (!imaevm_params.keypass)
+		imaevm_params.keypass = getenv("EVMCTL_KEY_PASSWORD");
+
 	if (argv[optind] == NULL)
 		usage();
 	else
-- 
2.31.1




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