blake2: re-add tests from upstream crate

These are the original tests from:

https://github.com/RustCrypto/hashes/tree/4a2845c226ba6748babdb2e704713fa9103d09f0/blake2/tests

They show that the new `blake2_simd` crate is API-compatible with the
old one.

Author: tarcieri

Cargo.lock

@@ -0,0 +1 @@
+blobby1absdefghfoobar 8ʧ���Y=��&2}B

blake2/tests/data/blake2b/fixed.blb

@@ -0,0 +1,18 @@
+#![no_std]
+
+use digest::dev::{digest_test, variable_test};
+use digest::new_test;
+
+new_test!(blake2b_fixed, "blake2b/fixed", blake2::Blake2b, digest_test);
+new_test!(
+    blake2b_variable,
+    "blake2b/variable",
+    blake2::VarBlake2b,
+    variable_test
+);
+new_test!(
+    blake2s_variable,
+    "blake2s/variable",
+    blake2::VarBlake2s,
+    variable_test
+);

blake2/tests/data/blake2b/mac.blb

@@ -0,0 +1,6 @@
+#![no_std]
+
+use crypto_mac::new_test;
+
+new_test!(blake2b_mac, "blake2b/mac", blake2::Blake2b);
+new_test!(blake2s_mac, "blake2s/mac", blake2::Blake2s);

blake2/tests/data/blake2b/variable.blb

@@ -0,0 +1,23 @@
+use blake2::{Blake2b, Blake2s, Digest};
+use hex_literal::hex;
+
+#[test]
+fn blake2s_persona() {
+    let key_bytes = hex!("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f");
+    let persona = "personal";
+    let persona_bytes = persona.as_bytes();
+    let ctx = Blake2s::with_params(&key_bytes, &[], persona_bytes);
+    assert_eq!(
+        ctx.finalize().as_slice(),
+        &hex!("25a4ee63b594aed3f88a971e1877ef7099534f9097291f88fb86c79b5e70d022")[..]
+    );
+}
+
+#[test]
+fn blake2b_persona() {
+    let key_bytes = hex!("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f");
+    let persona = "personal";
+    let persona_bytes = persona.as_bytes();
+    let ctx = Blake2b::with_params(&key_bytes, &[], persona_bytes);
+    assert_eq!(ctx.finalize().as_slice(), &hex!("03de3b295dcfc3b25b05abb09bc95fe3e9ff3073638badc68101d1e42019d0771dd07525a3aae8318e92c5e5d967ba92e4810d0021d7bf3b49da0b4b4a8a4e1f")[..]);
+}