diff --git a/Cargo.lock b/Cargo.lock
index 35435cabd..4fe14d22d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -113,6 +113,17 @@ name = "bitflags"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "blake2"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crypto-mac 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "blake2-rfc"
 version = "0.2.18"
@@ -225,6 +236,15 @@ dependencies = [
  "build_const 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "crypto-mac"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "subtle 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "diff"
 version = "0.1.11"
@@ -232,7 +252,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "digest"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -357,6 +377,11 @@ dependencies = [
  "unicode-segmentation 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hex"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "hexf"
 version = "0.1.0"
@@ -416,6 +441,11 @@ dependencies = [
  "wasm-bindgen 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "keccak"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "kernel32-sys"
 version = "0.2.2"
@@ -505,6 +535,16 @@ name = "maplit"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "md-5"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "memchr"
 version = "2.2.0"
@@ -964,9 +1004,12 @@ version = "0.1.0"
 dependencies = [
  "bincode 1.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "blake2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "caseless 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hexf 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -974,6 +1017,7 @@ dependencies = [
  "lexical 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "maplit 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "md-5 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-bigint 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-complex 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-integer 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -989,6 +1033,9 @@ dependencies = [
  "rustpython_parser 0.0.1",
  "serde 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha3 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "statrs 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-casing 0.1.0 (git+https://github.com/OddCoincidence/unicode-casing?rev=90d6d1f02b9cc04ffb55a5f1c3fa1455a84231fb)",
  "unicode-segmentation 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1091,17 +1138,40 @@ dependencies = [
  "serde 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "sha-1"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "sha2"
 version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "block-buffer 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "digest 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "opaque-debug 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "sha3"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "keccak 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "siphasher"
 version = "0.2.3"
@@ -1179,6 +1249,11 @@ name = "strsim"
 version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "subtle"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "syn"
 version = "0.11.11"
@@ -1544,6 +1619,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum bit-set 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e84c238982c4b1e1ee668d136c510c67a13465279c0cb367ea6baf6310620a80"
 "checksum bit-vec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f59bbe95d4e52a6398ec21238d31577f2b28a9d86807f06ca59d191d8440d0bb"
 "checksum bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3d155346769a6855b86399e9bc3814ab343cd3d62c7e985113d46a0ec3c281fd"
+"checksum blake2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "91721a6330935673395a0607df4d49a9cb90ae12d259f1b3e0a3f6e1d486872e"
 "checksum blake2-rfc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "5d6d530bdd2d52966a6d03b7a964add7ae1a288d25214066fd4b600f0f796400"
 "checksum block-buffer 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"
 "checksum block-padding 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "6d4dc3af3ee2e12f3e5d224e5e1e3d73668abbeb69e566d361f7d5563a4fdf09"
@@ -1559,8 +1635,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8ff012e225ce166d4422e0e78419d901719760f62ae2b7969ca6b564d1b54a9e"
 "checksum cpython 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b489034e723e7f5109fecd19b719e664f89ef925be785885252469e9822fa940"
 "checksum crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d663548de7f5cca343f1e0a48d14dcfb0e9eb4e079ec58883b7251539fa10aeb"
+"checksum crypto-mac 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4434400df11d95d556bac068ddfedd482915eb18fe8bea89bc80b6e4b1c179e5"
 "checksum diff 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "3c2b69f912779fbb121ceb775d74d51e915af17aaebc38d28a592843a2dd0a3a"
-"checksum digest 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "05f47366984d3ad862010e22c7ce81a7dbcaebbdfb37241a620f8b6596ee135c"
+"checksum digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
 "checksum dirs 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3fd78930633bd1c6e35c4b42b1df7b0cbc6bc191146e512bb3bedf243fcc3901"
 "checksum docopt 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7f525a586d310c87df72ebcd98009e57f1cc030c8c268305287a476beb653969"
 "checksum either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "5527cfe0d098f36e3f8839852688e63c8fff1c90b2b405aef730615f9a7bcf7b"
@@ -1576,6 +1653,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)" = "a2037ec1c6c1c4f79557762eab1f7eae1f64f6cb418ace90fae88f0942b60139"
 "checksum generic-array 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3c0f28c2f5bfb5960175af447a2da7c18900693738343dc896ffbcabd9839592"
 "checksum heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
+"checksum hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
 "checksum hexf 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e54653cc32d838771a36532647afad59c4bf7155745eeeec406f71fd5d7e7538"
 "checksum hexf-impl 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "22eadcfadba76a730b2764eaa577d045f35e0ef5174b9c5b46adf1ee42b85e12"
 "checksum hexf-parse 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "79296f72d53a89096cbc9a88c9547ee8dfe793388674620e2207593d370550ac"
@@ -1584,6 +1662,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5b8467d9c1cebe26feb08c640139247fac215782d35371ade9a2136ed6085358"
 "checksum itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "501266b7edd0174f8530248f87f99c88fbe60ca4ef3dd486835b8d8d53136f7f"
 "checksum js-sys 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)" = "9987e7c13a91d9cf0efe59cca48a3a7a70e2b11695d5a4640f85ae71e28f5e73"
+"checksum keccak 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "67c21572b4949434e4fc1e1978b99c5f77064153c59d998bf13ecd96fb5ecba7"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum lalrpop 0.16.3 (registry+https://github.com/rust-lang/crates.io-index)" = "4e2e80bee40b22bca46665b4ef1f3cd88ed0fb043c971407eac17a0712c02572"
 "checksum lalrpop-util 0.16.3 (registry+https://github.com/rust-lang/crates.io-index)" = "33b27d8490dbe1f9704b0088d61e8d46edc10d5673a8829836c6ded26a9912c7"
@@ -1594,6 +1673,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum log 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
 "checksum log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c84ec4b527950aa83a329754b01dbe3f58361d1c5efacd1f6d68c494d08a17c6"
 "checksum maplit 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "08cbb6b4fef96b6d77bfc40ec491b1690c779e77b05cd9f07f787ed376fd4c43"
+"checksum md-5 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a18af3dcaf2b0219366cdb4e2af65a6101457b415c3d1a5c71dd9c2b7c77b9c8"
 "checksum memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2efc7bc57c883d4a4d6e3246905283d8dae951bb3bd32f49d6ef297f546e1c39"
 "checksum new_debug_unreachable 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "f40f005c60db6e03bae699e414c58bf9aa7ea02a2d0b9bfbcf19286cc4c82b30"
 "checksum nix 0.13.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4dbdc256eaac2e3bd236d93ad999d3479ef775c863dbda3068c4006a92eec51b"
@@ -1651,7 +1731,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum serde-wasm-bindgen 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "7ee6f12f7ed0e7ad2e55200da37dbabc2cadeb942355c5b629aa3771f5ac5636"
 "checksum serde_derive 1.0.92 (registry+https://github.com/rust-lang/crates.io-index)" = "46a3223d0c9ba936b61c0d2e3e559e3217dbfb8d65d06d26e8b3c25de38bae3e"
 "checksum serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)" = "5a23aa71d4a4d43fdbfaac00eff68ba8a06a51759a89ac3304323e800c4dd40d"
+"checksum sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "23962131a91661d643c98940b20fcaffe62d776a823247be80a48fcb8b6fce68"
 "checksum sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7b4d8bfd0e469f417657573d8451fb33d16cfe0989359b93baf3a1ffc639543d"
+"checksum sha3 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dd26bc0e7a2e3a7c959bc494caf58b72ee0c71d67704e9520f736ca7e4853ecf"
 "checksum siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0b8de496cf83d4ed58b6be86c3a275b8602f6ffe98d3024a869e124147a9a3ac"
 "checksum smallvec 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)" = "ab606a9c5e214920bb66c458cd7be8ef094f813f20fe77a54cc7dbfff220d4b7"
 "checksum sourcefile 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4bf77cb82ba8453b42b6ae1d692e4cdc92f9a47beaf89a847c8be83f4e328ad3"
@@ -1663,6 +1745,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum string_cache_shared 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b1884d1bc09741d466d9b14e6d37ac89d6909cbcac41dd9ae982d4d063bbedfc"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum strsim 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "032c03039aae92b350aad2e3779c352e104d919cb192ba2fabbd7b831ce4f0f6"
+"checksum subtle 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2d67a5a62ba6e01cb2192ff309324cb4875d0c451d55fe2319433abe7a05a8ee"
 "checksum syn 0.11.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d3b891b9015c88c576343b9b3e41c2c11a51c219ef067b264bd9c8aa9b441dad"
 "checksum syn 0.15.35 (registry+https://github.com/rust-lang/crates.io-index)" = "641e117d55514d6d918490e47102f7e08d096fdde360247e4a10f7a91a8478d3"
 "checksum synom 0.11.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a393066ed9010ebaed60b9eafa373d4b1baac186dd7e008555b0f702b51945b6"
diff --git a/tests/snippets/test_hashlib.py b/tests/snippets/test_hashlib.py
new file mode 100644
index 000000000..796f6aefd
--- /dev/null
+++ b/tests/snippets/test_hashlib.py
@@ -0,0 +1,33 @@
+
+import hashlib
+
+# print(hashlib.md5)
+h = hashlib.md5()
+h.update(b'a')
+assert h.name == 'md5'
+print(h.hexdigest())
+
+assert h.hexdigest() == '0cc175b9c0f1b6a831c399e269772661'
+assert h.digest_size == 16
+
+h = hashlib.sha256()
+h.update(b'a')
+assert h.name == 'sha256'
+assert h.digest_size == 32
+print(h.hexdigest())
+
+assert h.hexdigest() == 'ca978112ca1bbdcafac231b39a23dc4da786eff8147c4e72b9807785afee48bb'
+
+h = hashlib.sha512()
+assert h.name == 'sha512'
+h.update(b'a')
+print(h.hexdigest())
+
+assert h.hexdigest() == '1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75'
+
+h = hashlib.new("blake2s", b"fubar")
+print(h.hexdigest())
+assert h.hexdigest() == 'a0e1ad0c123c9c65e8ef850db2ce4b5cef2c35b06527c615b0154353574d0415'
+h.update(b'bla')
+print(h.hexdigest())
+assert h.hexdigest() == '25738bfe4cc104131e1b45bece4dfd4e7e1d6f0dffda1211e996e9d5d3b66e81'
diff --git a/vm/Cargo.toml b/vm/Cargo.toml
index d2dc30e42..0a1b79c6f 100644
--- a/vm/Cargo.toml
+++ b/vm/Cargo.toml
@@ -5,6 +5,14 @@ authors = ["Shing Lyu <shing.lyu@gmail.com>"]
 edition = "2018"
 
 [dependencies]
+# Crypto:
+digest = "0.8.1"
+md-5 = "0.8"
+sha-1 = "0.8"
+sha2 = "0.8"
+sha3 = "0.8"
+blake2 = "0.8"
+
 num-complex = { version = "0.2", features = ["serde"] }
 num-bigint = { version = "0.2.1", features = ["serde"] }
 num-traits = "0.2"
@@ -27,6 +35,7 @@ unicode-xid = "0.1.0"
 lazy_static = "^1.0.1"
 lexical = "2.0.0"
 itertools = "^0.8.0"
+hex = "0.3.2"
 hexf = "0.1.0"
 indexmap = "1.0.2"
 crc = "^1.0.0"
diff --git a/vm/src/stdlib/hashlib.rs b/vm/src/stdlib/hashlib.rs
new file mode 100644
index 000000000..719e3a329
--- /dev/null
+++ b/vm/src/stdlib/hashlib.rs
@@ -0,0 +1,282 @@
+use crate::function::{OptionalArg, PyFuncArgs};
+use crate::obj::objbytes::{PyBytes, PyBytesRef};
+use crate::obj::objstr::PyStringRef;
+use crate::obj::objtype::PyClassRef;
+use crate::pyobject::{PyClassImpl, PyObjectRef, PyResult, PyValue};
+use crate::vm::VirtualMachine;
+use std::cell::RefCell;
+use std::fmt;
+
+use blake2::{Blake2b, Blake2s};
+use digest::DynDigest;
+use md5::Md5;
+use sha1::Sha1;
+use sha2::{Sha224, Sha256, Sha384, Sha512};
+use sha3::{Sha3_224, Sha3_256, Sha3_384, Sha3_512}; // TODO: , Shake128, Shake256};
+
+#[pyclass(name = "hasher")]
+struct PyHasher {
+    name: String,
+    buffer: RefCell<HashWrapper>,
+}
+
+impl fmt::Debug for PyHasher {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "hasher {}", self.name)
+    }
+}
+
+impl PyValue for PyHasher {
+    fn class(vm: &VirtualMachine) -> PyClassRef {
+        vm.class("hashlib", "hasher")
+    }
+}
+
+#[pyimpl]
+impl PyHasher {
+    fn new(name: &str, d: HashWrapper) -> Self {
+        PyHasher {
+            name: name.to_string(),
+            buffer: RefCell::new(d),
+        }
+    }
+
+    #[pymethod(name = "__new__")]
+    fn py_new(_cls: PyClassRef, _args: PyFuncArgs, vm: &VirtualMachine) -> PyResult {
+        Ok(PyHasher::new("md5", HashWrapper::md5())
+            .into_ref(vm)
+            .into_object())
+    }
+
+    #[pyproperty(name = "name")]
+    fn name(&self, _vm: &VirtualMachine) -> String {
+        self.name.clone()
+    }
+
+    #[pyproperty(name = "digest_size")]
+    fn digest_size(&self, vm: &VirtualMachine) -> PyResult {
+        Ok(vm.ctx.new_int(self.buffer.borrow().digest_size()))
+    }
+
+    #[pymethod(name = "update")]
+    fn update(&self, data: PyBytesRef, vm: &VirtualMachine) -> PyResult {
+        self.buffer.borrow_mut().input(data.get_value());
+        Ok(vm.get_none())
+    }
+
+    #[pymethod(name = "digest")]
+    fn digest(&self, _vm: &VirtualMachine) -> PyBytes {
+        let result = self.get_digest();
+        PyBytes::new(result)
+    }
+
+    #[pymethod(name = "hexdigest")]
+    fn hexdigest(&self, _vm: &VirtualMachine) -> String {
+        let result = self.get_digest();
+        hex::encode(result)
+    }
+
+    fn get_digest(&self) -> Vec<u8> {
+        self.buffer.borrow().get_digest()
+    }
+}
+
+fn hashlib_new(
+    name: PyStringRef,
+    data: OptionalArg<PyBytesRef>,
+    vm: &VirtualMachine,
+) -> PyResult<PyHasher> {
+    let hasher = match name.value.as_ref() {
+        "md5" => Ok(PyHasher::new("md5", HashWrapper::md5())),
+        "sha1" => Ok(PyHasher::new("sha1", HashWrapper::sha1())),
+        "sha224" => Ok(PyHasher::new("sha224", HashWrapper::sha224())),
+        "sha256" => Ok(PyHasher::new("sha256", HashWrapper::sha256())),
+        "sha384" => Ok(PyHasher::new("sha384", HashWrapper::sha384())),
+        "sha512" => Ok(PyHasher::new("sha512", HashWrapper::sha512())),
+        "sha3_224" => Ok(PyHasher::new("sha3_224", HashWrapper::sha3_224())),
+        "sha3_256" => Ok(PyHasher::new("sha3_256", HashWrapper::sha3_256())),
+        "sha3_384" => Ok(PyHasher::new("sha3_384", HashWrapper::sha3_384())),
+        "sha3_512" => Ok(PyHasher::new("sha3_512", HashWrapper::sha3_512())),
+        // TODO: "shake128" => Ok(PyHasher::new("shake128", HashWrapper::shake128())),
+        // TODO: "shake256" => Ok(PyHasher::new("shake256", HashWrapper::shake256())),
+        "blake2b" => Ok(PyHasher::new("blake2b", HashWrapper::blake2b())),
+        "blake2s" => Ok(PyHasher::new("blake2s", HashWrapper::blake2s())),
+        other => Err(vm.new_value_error(format!("Unknown hashing algorithm: {}", other))),
+    }?;
+
+    if let OptionalArg::Present(data) = data {
+        hasher.update(data, vm)?;
+    }
+
+    Ok(hasher)
+}
+
+fn md5(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("md5", HashWrapper::md5()))
+}
+
+fn sha1(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("sha1", HashWrapper::sha1()))
+}
+
+fn sha224(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("sha224", HashWrapper::sha224()))
+}
+
+fn sha256(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("sha256", HashWrapper::sha256()))
+}
+
+fn sha384(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("sha384", HashWrapper::sha384()))
+}
+
+fn sha512(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("sha512", HashWrapper::sha512()))
+}
+
+fn sha3_224(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("sha3_224", HashWrapper::sha3_224()))
+}
+
+fn sha3_256(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("sha3_256", HashWrapper::sha3_256()))
+}
+
+fn sha3_384(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("sha3_384", HashWrapper::sha3_384()))
+}
+
+fn sha3_512(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Ok(PyHasher::new("sha3_512", HashWrapper::sha3_512()))
+}
+
+fn shake128(vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Err(vm.new_not_implemented_error("shake256".to_string()))
+    // Ok(PyHasher::new("shake128", HashWrapper::shake128()))
+}
+
+fn shake256(vm: &VirtualMachine) -> PyResult<PyHasher> {
+    Err(vm.new_not_implemented_error("shake256".to_string()))
+    // TODO: Ok(PyHasher::new("shake256", HashWrapper::shake256()))
+}
+
+fn blake2b(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    // TODO: handle parameters
+    Ok(PyHasher::new("blake2b", HashWrapper::blake2b()))
+}
+
+fn blake2s(_vm: &VirtualMachine) -> PyResult<PyHasher> {
+    // TODO: handle parameters
+    Ok(PyHasher::new("blake2s", HashWrapper::blake2s()))
+}
+
+pub fn make_module(vm: &VirtualMachine) -> PyObjectRef {
+    let ctx = &vm.ctx;
+
+    let hasher_type = PyHasher::make_class(ctx);
+
+    py_module!(vm, "hashlib", {
+        "new" => ctx.new_rustfunc(hashlib_new),
+        "md5" => ctx.new_rustfunc(md5),
+        "sha1" => ctx.new_rustfunc(sha1),
+        "sha224" => ctx.new_rustfunc(sha224),
+        "sha256" => ctx.new_rustfunc(sha256),
+        "sha384" => ctx.new_rustfunc(sha384),
+        "sha512" => ctx.new_rustfunc(sha512),
+        "sha3_224" => ctx.new_rustfunc(sha3_224),
+        "sha3_256" => ctx.new_rustfunc(sha3_256),
+        "sha3_384" => ctx.new_rustfunc(sha3_384),
+        "sha3_512" => ctx.new_rustfunc(sha3_512),
+        "shake128" => ctx.new_rustfunc(shake128),
+        "shake256" => ctx.new_rustfunc(shake256),
+        "blake2b" => ctx.new_rustfunc(blake2b),
+        "blake2s" => ctx.new_rustfunc(blake2s),
+        "hasher" => hasher_type,
+    })
+}
+
+/// Generic wrapper patching around the hashing libraries.
+struct HashWrapper {
+    inner: Box<DynDigest>,
+}
+
+impl HashWrapper {
+    fn new<D: 'static>(d: D) -> Self
+    where
+        D: DynDigest,
+        D: Sized,
+    {
+        HashWrapper { inner: Box::new(d) }
+    }
+
+    fn md5() -> Self {
+        Self::new(Md5::default())
+    }
+
+    fn sha1() -> Self {
+        Self::new(Sha1::default())
+    }
+
+    fn sha224() -> Self {
+        Self::new(Sha224::default())
+    }
+
+    fn sha256() -> Self {
+        Self::new(Sha256::default())
+    }
+
+    fn sha384() -> Self {
+        Self::new(Sha384::default())
+    }
+
+    fn sha512() -> Self {
+        Self::new(Sha512::default())
+    }
+
+    fn sha3_224() -> Self {
+        Self::new(Sha3_224::default())
+    }
+
+    fn sha3_256() -> Self {
+        Self::new(Sha3_256::default())
+    }
+
+    fn sha3_384() -> Self {
+        Self::new(Sha3_384::default())
+    }
+
+    fn sha3_512() -> Self {
+        Self::new(Sha3_512::default())
+    }
+
+    /* TODO:
+        fn shake128() -> Self {
+            Self::new(Shake128::default())
+        }
+
+        fn shake256() -> Self {
+            Self::new(Shake256::default())
+        }
+    */
+    fn blake2b() -> Self {
+        Self::new(Blake2b::default())
+    }
+
+    fn blake2s() -> Self {
+        Self::new(Blake2s::default())
+    }
+
+    fn input(&mut self, data: &[u8]) {
+        self.inner.input(data);
+    }
+
+    fn digest_size(&self) -> usize {
+        self.inner.output_size()
+    }
+
+    fn get_digest(&self) -> Vec<u8> {
+        let cloned = self.inner.clone();
+        cloned.result().to_vec()
+    }
+}
diff --git a/vm/src/stdlib/mod.rs b/vm/src/stdlib/mod.rs
index 8329b3092..f62d073d4 100644
--- a/vm/src/stdlib/mod.rs
+++ b/vm/src/stdlib/mod.rs
@@ -1,6 +1,7 @@
 mod ast;
 mod binascii;
 mod dis;
+mod hashlib;
 mod imp;
 mod itertools;
 mod json;
@@ -39,6 +40,7 @@ pub fn get_module_inits() -> HashMap<String, StdlibInitFunc> {
         "ast".to_string() => Box::new(ast::make_module) as StdlibInitFunc,
         "binascii".to_string() => Box::new(binascii::make_module),
         "dis".to_string() => Box::new(dis::make_module),
+        "hashlib".to_string() => Box::new(hashlib::make_module),
         "itertools".to_string() => Box::new(itertools::make_module),
         "json".to_string() => Box::new(json::make_module),
         "keyword".to_string() => Box::new(keyword::make_module),