diff --git a/Cargo.lock b/Cargo.lock
index 70684fd4a..9135d08a8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -31,6 +31,14 @@ dependencies = [
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "arrayvec"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -77,12 +85,12 @@ name = "bit-set"
 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bit-vec 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bit-vec 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "bit-vec"
-version = "0.6.2"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -95,6 +103,15 @@ name = "bitflags"
 version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "blake2-rfc"
+version = "0.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "arrayvec 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "constant_time_eq 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.2.0"
@@ -112,7 +129,7 @@ dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-automata 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.118 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -190,6 +207,11 @@ name = "const_fn"
 version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "constant_time_eq"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "conv"
 version = "0.3.3"
@@ -407,10 +429,10 @@ dependencies = [
  "plotters 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.118 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_cbor 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.59 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.118 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.60 (registry+https://github.com/rust-lang/crates.io-index)",
  "tinytemplate 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -475,7 +497,7 @@ dependencies = [
  "csv-core 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ryu 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.118 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1112,7 +1134,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.117"
+version = "1.0.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1121,27 +1143,27 @@ version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "half 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.118 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.117"
+version = "1.0.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.59"
+version = "1.0.60"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "itoa 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ryu 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.118 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1197,7 +1219,7 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.53"
+version = "1.0.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1307,8 +1329,8 @@ name = "tinytemplate"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.59 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.118 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.60 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1620,6 +1642,7 @@ dependencies = [
 name = "uu_hashsum"
 version = "0.0.1"
 dependencies = [
+ "blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.33.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2334,7 +2357,7 @@ version = "0.0.4"
 dependencies = [
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2386,7 +2409,7 @@ dependencies = [
  "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-shared 0.2.69 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2406,7 +2429,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 1.0.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.53 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-backend 0.2.69 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-shared 0.2.69 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2483,15 +2506,17 @@ dependencies = [
 "checksum aho-corasick 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "81ce3d38065e618af2d7b77e10c5ad9a069859b4be3c2250f674af3840d9c8a5"
 "checksum aho-corasick 0.7.15 (registry+https://github.com/rust-lang/crates.io-index)" = "7404febffaa47dac81aa44dba71523c9d069b1bdc50a77db41195149e17f68e5"
 "checksum ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
+"checksum arrayvec 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)" = "cd9fd44efafa8690358b7408d253adf110036b88f55672a933f01d616ad9b1b9"
 "checksum atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
 "checksum autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "1d49d90015b3c36167a20fe2810c5cd875ad504b39cff3d4eae7977e6b7c1cb2"
 "checksum autocfg 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 "checksum backtrace 0.3.30 (registry+https://github.com/rust-lang/crates.io-index)" = "ada4c783bb7e7443c14e0480f429ae2cc99da95065aeab7ee1b81ada0419404f"
 "checksum backtrace-sys 0.1.37 (registry+https://github.com/rust-lang/crates.io-index)" = "18fbebbe1c9d1f383a9cc7e8ccdb471b91c8d024ee9c2ca5b5346121fe8b4399"
 "checksum bit-set 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6e11e16035ea35e4e5997b393eacbf6f63983188f7a2ad25bfb13465f5ad59de"
-"checksum bit-vec 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "5f0dc55f2d8a1a85650ac47858bb001b4c0dd73d79e3c455a842925e68d29cd3"
+"checksum bit-vec 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "349f9b6a179ed607305526ca489b34ad0a41aed5f7980fa90eb03160b69598fb"
 "checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
 "checksum bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
+"checksum blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6d530bdd2d52966a6d03b7a964add7ae1a288d25214066fd4b600f0f796400"
 "checksum block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1339a1042f5d9f295737ad4d9a6ab6bf81c84a933dba110b9200cd6d1448b814"
 "checksum bstr 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "473fc6b38233f9af7baa94fb5852dca389e3d95b8e21c8e3719301462c5d9faf"
 "checksum bumpalo 3.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2e8c087f005730276d1096a652e92a8bacee2e2472bcc9715a74d2bec38b5820"
@@ -2505,6 +2530,7 @@ dependencies = [
 "checksum clap 2.33.3 (registry+https://github.com/rust-lang/crates.io-index)" = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
 "checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
 "checksum const_fn 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c478836e029dcef17fb47c89023448c64f781a046e0300e257ad8225ae59afab"
+"checksum constant_time_eq 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
 "checksum conv 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "78ff10625fd0ac447827aa30ea8b861fead473bb60aeb73af6c1c58caf0d1299"
 "checksum cpp 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2d1cd8699ffa1b18fd388183f7762e0545eddbd5c6ec95e9e3b42a4a71a507ff"
 "checksum cpp_build 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c47531e7e09532ad4827098729794f5e1a5b1c2ccbb5e295498d2e7ab451c445"
@@ -2605,17 +2631,17 @@ dependencies = [
 "checksum scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 "checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
 "checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
-"checksum serde 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)" = "b88fa983de7720629c9387e9f517353ed404164b1e482c970a90c1a4aaf7dc1a"
+"checksum serde 1.0.118 (registry+https://github.com/rust-lang/crates.io-index)" = "06c64263859d87aa2eb554587e2d23183398d617427327cf2b3d0ed8c69e4800"
 "checksum serde_cbor 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1e18acfa2f90e8b735b2836ab8d538de304cbb6729a7360729ea5a895d15a622"
-"checksum serde_derive 1.0.117 (registry+https://github.com/rust-lang/crates.io-index)" = "cbd1ae72adb44aab48f325a02444a5fc079349a8d804c1fc922aed3f7454c74e"
-"checksum serde_json 1.0.59 (registry+https://github.com/rust-lang/crates.io-index)" = "dcac07dbffa1c65e7f816ab9eba78eb142c6d44410f4eeba1e26e4f5dfa56b95"
+"checksum serde_derive 1.0.118 (registry+https://github.com/rust-lang/crates.io-index)" = "c84d3526699cd55261af4b941e4e725444df67aa4f9e6a3564f18030d12672df"
+"checksum serde_json 1.0.60 (registry+https://github.com/rust-lang/crates.io-index)" = "1500e84d27fe482ed1dc791a56eddc2f230046a040fa908c08bda1d9fb615779"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
 "checksum sha2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7d963c78ce367df26d7ea8b8cc655c651b42e8a1e584e869c1e17dae3ccb116a"
 "checksum sha3 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "26405905b6a56a94c60109cfda62610507ac14a65be531f5767dec5c5a8dd6a0"
 "checksum smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "f7b0758c52e15a8b5e3691eae6cc559f08eee9406e548a4477ba4e67770a82b6"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
-"checksum syn 1.0.53 (registry+https://github.com/rust-lang/crates.io-index)" = "8833e20724c24de12bbaba5ad230ea61c3eafb05b881c7c9d3cfe8638b187e68"
+"checksum syn 1.0.54 (registry+https://github.com/rust-lang/crates.io-index)" = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
 "checksum synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3a761d12e6d8dcb4dcf952a7a89b475e3a9d69e4a69307e01a470977642914bd"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
diff --git a/src/uu/hashsum/Cargo.toml b/src/uu/hashsum/Cargo.toml
index a54a2beac..1e1808f59 100644
--- a/src/uu/hashsum/Cargo.toml
+++ b/src/uu/hashsum/Cargo.toml
@@ -25,6 +25,7 @@ regex-syntax = "0.6.7"
 sha1 = "0.6.0"
 sha2 = "0.6.0"
 sha3 = "0.6.0"
+blake2-rfc = "0.2.18"
 uucore = { version=">=0.0.4", package="uucore", path="../../uucore" }
 uucore_procs = { version=">=0.0.4", package="uucore_procs", path="../../uucore_procs" }
 
diff --git a/src/uu/hashsum/src/digest.rs b/src/uu/hashsum/src/digest.rs
index ea2953dfd..218de0a36 100644
--- a/src/uu/hashsum/src/digest.rs
+++ b/src/uu/hashsum/src/digest.rs
@@ -1,3 +1,4 @@
+extern crate blake2_rfc;
 extern crate digest;
 extern crate md5;
 extern crate sha1;
@@ -48,6 +49,29 @@ impl Digest for md5::Context {
     }
 }
 
+impl Digest for blake2_rfc::blake2b::Blake2b {
+    fn new() -> Self {
+        blake2_rfc::blake2b::Blake2b::new(64)
+    }
+
+    fn input(&mut self, input: &[u8]) {
+        self.update(input);
+    }
+
+    fn result(&mut self, out: &mut [u8]) {
+        let hash_result = &self.clone().finalize();
+        out.copy_from_slice(&hash_result.as_bytes());
+    }
+
+    fn reset(&mut self) {
+        *self = blake2_rfc::blake2b::Blake2b::new(64);
+    }
+
+    fn output_bits(&self) -> usize {
+        512
+    }
+}
+
 impl Digest for sha1::Sha1 {
     fn new() -> Self {
         sha1::Sha1::new()
diff --git a/src/uu/hashsum/src/hashsum.rs b/src/uu/hashsum/src/hashsum.rs
index e1bc2e9d9..ca31514bc 100644
--- a/src/uu/hashsum/src/hashsum.rs
+++ b/src/uu/hashsum/src/hashsum.rs
@@ -11,6 +11,7 @@
 
 #[macro_use]
 extern crate clap;
+extern crate blake2_rfc;
 extern crate hex;
 extern crate md5;
 extern crate regex;
@@ -26,6 +27,7 @@ mod digest;
 
 use self::digest::Digest;
 
+use blake2_rfc::blake2b::Blake2b;
 use clap::{App, Arg, ArgMatches};
 use hex::ToHex;
 use md5::Context as Md5;
@@ -62,7 +64,7 @@ fn is_custom_binary(program: &str) -> bool {
     match program {
         "md5sum" | "sha1sum" | "sha224sum" | "sha256sum" | "sha384sum" | "sha512sum"
         | "sha3sum" | "sha3-224sum" | "sha3-256sum" | "sha3-384sum" | "sha3-512sum"
-        | "shake128sum" | "shake256sum" => true,
+        | "shake128sum" | "shake256sum" | "b2sum" => true,
         _ => false,
     }
 }
@@ -82,6 +84,7 @@ fn detect_algo<'a>(
         "sha256sum" => ("SHA256", Box::new(Sha256::new()) as Box<dyn Digest>, 256),
         "sha384sum" => ("SHA384", Box::new(Sha384::new()) as Box<dyn Digest>, 384),
         "sha512sum" => ("SHA512", Box::new(Sha512::new()) as Box<dyn Digest>, 512),
+        "b2sum" => ("BLAKE2", Box::new(Blake2b::new(64)) as Box<dyn Digest>, 512),
         "sha3sum" => match matches.value_of("bits") {
             Some(bits_str) => match usize::from_str_radix(&bits_str, 10) {
                 Ok(224) => (
@@ -182,6 +185,9 @@ fn detect_algo<'a>(
                 if matches.is_present("sha512") {
                     set_or_crash("SHA512", Box::new(Sha512::new()), 512)
                 }
+                if matches.is_present("b2sum") {
+                    set_or_crash("BLAKE2", Box::new(Blake2b::new(64)), 512)
+                }
                 if matches.is_present("sha3") {
                     match matches.value_of("bits") {
                         Some(bits_str) => match usize::from_str_radix(&bits_str, 10) {
@@ -383,6 +389,7 @@ pub fn uumain(mut args: impl uucore::Args) -> i32 {
                 "shake256",
                 "work with SHAKE256 using BITS for the output size",
             ),
+            ("b2sum", "work with BLAKE2"),
         ];
 
         for (name, desc) in algos {
diff --git a/tests/by-util/test_hashsum.rs b/tests/by-util/test_hashsum.rs
index af4021af4..6e7d59107 100644
--- a/tests/by-util/test_hashsum.rs
+++ b/tests/by-util/test_hashsum.rs
@@ -43,4 +43,5 @@ test_digest! {
     sha3_512 sha3 512
     shake128_256 shake128 256
     shake256_512 shake256 512
+    b2sum b2sum 512
 }
diff --git a/tests/fixtures/hashsum/b2sum.expected b/tests/fixtures/hashsum/b2sum.expected
new file mode 100644
index 000000000..a0dae0db4
--- /dev/null
+++ b/tests/fixtures/hashsum/b2sum.expected
@@ -0,0 +1 @@
+7355dd5276c21cfe0c593b5063b96af3f96a454b33216f58314f44c3ade92e9cd6cec4210a0836246780e9baf927cc50b9a3d7073e8f9bd12780fddbcb930c6d
\ No newline at end of file