Adding digital locker example (#117)

Cargo.lock

@@ -1,5 +1,14 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "aead"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fc95d1bdb8e6666b2b217308eeeb09f2d6728d104be3e31916cc74d15420331"
+dependencies = [
+ "generic-array",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.35"
@@ -133,6 +142,29 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "chacha20"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed8738f14471a99f0e316c327e68fc82a3611cc2895fcb604b89eedaf8f39d95"
+dependencies = [
+ "cipher",
+ "zeroize",
+]
+
+[[package]]
+name = "chacha20poly1305"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af1fc18e6d90c40164bf6c317476f2a98f04661e310e79830366b7e914c58a8e"
+dependencies = [
+ "aead",
+ "chacha20",
+ "cipher",
+ "poly1305",
+ "zeroize",
+]
+
 [[package]]
 name = "cipher"
 version = "0.2.5"
@@ -165,6 +197,12 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8aebca1129a03dc6dc2b127edd729435bbc4a37e1d5f4d7513165089ceb02634"
 
+[[package]]
+name = "cpuid-bool"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcb25d077389e53838a8158c8e99174c5a9d902dee4904320db714f3c653ffba"
+
 [[package]]
 name = "criterion"
 version = "0.3.3"
@@ -570,6 +608,7 @@ version = "0.3.0-pre.1"
 dependencies = [
  "anyhow",
  "base64",
+ "chacha20poly1305",
  "criterion",
  "curve25519-dalek",
  "digest",
@@ -616,6 +655,16 @@ dependencies = [
  "web-sys",
 ]
 
+[[package]]
+name = "poly1305"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4b7456bc1ad2d4cf82b3a016be4c2ac48daf11bf990c1603ebd447fe6f30fca8"
+dependencies = [
+ "cpuid-bool 0.2.0",
+ "universal-hash",
+]
+
 [[package]]
 name = "ppv-lite86"
 version = "0.2.8"
@@ -952,7 +1001,7 @@ checksum = "6e7aab86fe2149bad8c507606bdb3f4ef5e7b2380eb92350f56122cca72a42a8"
 dependencies = [
  "block-buffer",
  "cfg-if 1.0.0",
- "cpuid-bool",
+ "cpuid-bool 0.1.2",
  "digest",
  "opaque-debug",
 ]
@@ -1063,6 +1112,16 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
 
+[[package]]
+name = "universal-hash"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8326b2c654932e3e4f9196e69d08fdf7cfd718e1dc6f66b347e6024a0c961402"
+dependencies = [
+ "generic-array",
+ "subtle",
+]
+
 [[package]]
 name = "utf8parse"
 version = "0.2.0"