Implement --identity command

Cargo.lock

@@ -43,9 +43,11 @@ dependencies = [
  "age-core",
  "age-plugin",
  "bech32",
+ "console",
  "elliptic-curve",
  "gumdrop",
  "p256",
+ "sha2",
  "x509-parser 0.9.0",
  "yubikey-piv",
 ]
@@ -186,6 +188,21 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "console"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7cc80946b3480f421c2f17ed1cb841753a371c7c5104f51d507e13f532c856aa"
+dependencies = [
+ "encode_unicode",
+ "lazy_static",
+ "libc",
+ "regex",
+ "terminal_size",
+ "unicode-width",
+ "winapi",
+]
+
 [[package]]
 name = "const-oid"
 version = "0.1.0"
@@ -313,6 +330,12 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "encode_unicode"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a357d28ed41a50f9c765dbfe56cbc04a64e53e5fc58ba79fbc34c10ef3df831f"
+
 [[package]]
 name = "ff"
 version = "0.8.0"
@@ -909,6 +932,16 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "36474e732d1affd3a6ed582781b3683df3d0563714c59c39591e8ff707cf078e"
 
+[[package]]
+name = "terminal_size"
+version = "0.1.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4bd2d183bd3fac5f5fe38ddbeb4dc9aec4a39a9d7d59e7491d900302da01cbe1"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.23"
@@ -946,6 +979,12 @@ version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "373c8a200f9e67a0c95e62a4f52fbf80c23b4381c05a17845531982fa99e6b33"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.1"