Add blake2 dependency

Cargo.lock

@@ -150,6 +150,18 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
+[[package]]
+name = "blake2"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94cb07b0da6a73955f8fb85d24c466778e70cda767a568229b104f0264089330"
+dependencies = [
+ "byte-tools",
+ "crypto-mac",
+ "digest",
+ "opaque-debug",
+]
+
 [[package]]
 name = "blake2b_simd"
 version = "0.5.10"
@@ -188,7 +200,7 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "20c116dad307b68138cc2e2f3a699c16f52faa47c65f98fc6de1dea9a097ee1e"
 dependencies = [
- "subtle",
+ "subtle 2.2.2",
 ]
 
 [[package]]
@@ -310,6 +322,16 @@ dependencies = [
  "lazy_static",
 ]
 
+[[package]]
+name = "crypto-mac"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4434400df11d95d556bac068ddfedd482915eb18fe8bea89bc80b6e4b1c179e5"
+dependencies = [
+ "generic-array",
+ "subtle 1.0.0",
+]
+
 [[package]]
 name = "curve25519-dalek"
 version = "2.0.0"
@@ -319,7 +341,7 @@ dependencies = [
  "byteorder",
  "digest",
  "rand_core 0.5.1",
- "subtle",
+ "subtle 2.2.2",
  "zeroize",
 ]
 
@@ -703,7 +725,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aaacc6b2b5fa79a5bd49de8439534b1f98886f06b88da02afeb968d60678b978"
 dependencies = [
  "bls12_381",
- "subtle",
+ "subtle 2.2.2",
 ]
 
 [[package]]
@@ -1576,6 +1598,12 @@ version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6446ced80d6c486436db5c078dde11a9f73d42b57fb273121e160b84f63d894c"
 
+[[package]]
+name = "subtle"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d67a5a62ba6e01cb2192ff309324cb4875d0c451d55fe2319433abe7a05a8ee"
+
 [[package]]
 name = "subtle"
 version = "2.2.2"
@@ -2048,6 +2076,7 @@ dependencies = [
 name = "zebra-chain"
 version = "0.1.0"
 dependencies = [
+ "blake2",
  "bs58",
  "byteorder",
  "chrono",

zebra-chain/Cargo.toml

@@ -8,6 +8,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+blake2 = "0.8.1"
 bs58 = { version = "0.3", features = ["check"] }
 byteorder = "1.3"
 chrono = "0.4"