Define the default algo in acme_common

Because ring does not currently support RSA keys generation, the default
algo must be adapted depending on whether or not the standalone feature
is activated.

acme_common/src/crypto.rs

@@ -7,7 +7,10 @@ mod standalone_hash;
 
 mod openssl_keys;
 
+#[cfg(not(feature = "standalone"))]
 pub const DEFAULT_ALGO: &str = "rsa2048";
+#[cfg(feature = "standalone")]
+pub const DEFAULT_ALGO: &str = "ecdsa_p256";
 
 pub use openssl_certificate::{Csr, X509Certificate};
 

acmed/src/config.rs

@@ -284,7 +284,7 @@ impl Certificate {
     pub fn get_algorithm(&self) -> Result<Algorithm, Error> {
         let algo = match &self.algorithm {
             Some(a) => &a,
-            None => crate::DEFAULT_ALGO,
+            None => acme_common::crypto::DEFAULT_ALGO,
         };
         Algorithm::from_str(algo)
     }

acmed/src/main.rs

@@ -18,7 +18,6 @@ pub const DEFAULT_CONFIG_FILE: &str = "/etc/acmed/acmed.toml";
 pub const DEFAULT_ACCOUNTS_DIR: &str = "/etc/acmed/accounts";
 pub const DEFAULT_CERT_DIR: &str = "/etc/acmed/certs";
 pub const DEFAULT_CERT_FORMAT: &str = "{{name}}_{{algo}}.{{file_type}}.{{ext}}";
-pub const DEFAULT_ALGO: &str = "rsa2048";
 pub const DEFAULT_SLEEP_TIME: u64 = 3600;
 pub const DEFAULT_POOL_TIME: u64 = 5000;
 pub const DEFAULT_CERT_FILE_MODE: u32 = 0o644;