diff --git a/Cargo.lock b/Cargo.lock
index cf8bd4348..aa7cfeb8b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -198,6 +198,20 @@ name = "bitflags"
 version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "block-buffer"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "byte-tools"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
 version = "1.1.0"
@@ -344,6 +358,14 @@ dependencies = [
  "uucore 0.0.1",
 ]
 
+[[package]]
+name = "digest"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "dircolors"
 version = "0.0.1"
@@ -414,6 +436,11 @@ dependencies = [
  "uucore 0.0.1",
 ]
 
+[[package]]
+name = "fake-simd"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "false"
 version = "0.0.1"
@@ -448,9 +475,13 @@ dependencies = [
 ]
 
 [[package]]
-name = "gcc"
-version = "0.3.51"
+name = "generic-array"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typenum 1.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "getopts"
@@ -478,12 +509,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "hashsum"
 version = "0.0.1"
 dependencies = [
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "md5 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha1 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha3 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1",
 ]
 
@@ -610,6 +645,11 @@ dependencies = [
  "uucore 0.0.1",
 ]
 
+[[package]]
+name = "md5"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "memchr"
 version = "1.0.1"
@@ -705,6 +745,14 @@ dependencies = [
  "uucore 0.0.1",
 ]
 
+[[package]]
+name = "nodrop"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "odds 0.2.25 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "nohup"
 version = "0.0.1"
@@ -775,6 +823,11 @@ dependencies = [
  "uucore 0.0.1",
 ]
 
+[[package]]
+name = "odds"
+version = "0.2.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "onig"
 version = "1.6.1"
@@ -958,18 +1011,6 @@ dependencies = [
  "uucore 0.0.1",
 ]
 
-[[package]]
-name = "rust-crypto"
-version = "0.2.36"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "rustc-serialize"
 version = "0.3.24"
@@ -1018,6 +1059,34 @@ dependencies = [
  "uucore 0.0.1",
 ]
 
+[[package]]
+name = "sha1"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "sha2"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "sha3"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "shred"
 version = "0.0.1"
@@ -1279,6 +1348,11 @@ dependencies = [
  "uucore 0.0.1",
 ]
 
+[[package]]
+name = "typenum"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "uname"
 version = "0.0.1"
@@ -1470,6 +1544,8 @@ dependencies = [
 "checksum bit-vec 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "02b4ff8b16e6076c3e14220b39fbc1fabb6737522281a388998046859400895f"
 "checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
 "checksum bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4efd02e230a02e18f92fc2735f44597385ed02ad8f831e7c1c1156ee5e1ab3a5"
+"checksum block-buffer 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1339a1042f5d9f295737ad4d9a6ab6bf81c84a933dba110b9200cd6d1448b814"
+"checksum byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "560c32574a12a89ecd91f5e742165893f86e3ab98d21f8ea548658eb9eef5f40"
 "checksum byteorder 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff81738b726f5d099632ceaffe7fb65b90212e8dce59d518729e7e8634032d3d"
 "checksum cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7db2f146208d7e0fbee761b09cd65a7f51ccc38705d4e7262dad4d73b12a76b1"
 "checksum cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "d4c819a1287eb618df47cc647173c5c4c66ba19d888a6e50d605672aed3140de"
@@ -1477,10 +1553,12 @@ dependencies = [
 "checksum clap 2.25.0 (registry+https://github.com/rust-lang/crates.io-index)" = "867a885995b4184be051b70a592d4d70e32d7a188db6e8dff626af286a962771"
 "checksum cmake 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)" = "357c07e7a1fc95732793c1edb5901e1a1f305cfcf63a90eb12dbd22bdb6b789d"
 "checksum data-encoding 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d867ddbf09de0b73e09ec798972fb7f870495a0893f6f736c1855448c5a56789"
+"checksum digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e5b29bf156f3f4b3c4f610a25ff69370616ae6e0657d416de22645483e72af0a"
 "checksum either 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "18785c1ba806c258137c937e44ada9ee7e69a37e3c72077542cd2f069d78562a"
+"checksum fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 "checksum filetime 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "5363ab8e4139b8568a6237db5248646e5a8a2f89bd5ccb02092182b11fd3e922"
 "checksum fnv 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6cc484842f1e2884faf56f529f960cc12ad8c71ce96cc7abba0a067c98fee344"
-"checksum gcc 0.3.51 (registry+https://github.com/rust-lang/crates.io-index)" = "120d07f202dcc3f72859422563522b66fe6463a4c513df062874daad05f85f0a"
+"checksum generic-array 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "fceb69994e330afed50c93524be68c42fa898c2d9fd4ee8da03bd7363acd26f2"
 "checksum getopts 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "d9047cfbd08a437050b363d35ef160452c5fe8ea5187ae0a624708c91581d685"
 "checksum glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "8be18de09a56b60ed0edf84bc9df007e30040691af7acd1c41874faac5895bfb"
 "checksum half 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "63d68db75012a85555434ee079e7e6337931f87a087ab2988becbadf64673a7f"
@@ -1490,13 +1568,16 @@ dependencies = [
 "checksum lazy_static 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "3b37545ab726dd833ec6420aaba8231c5b320814b9029ad585555d2a03e94fbf"
 "checksum libc 0.2.26 (git+https://github.com/rust-lang/libc.git)" = "<none>"
 "checksum libc 0.2.26 (registry+https://github.com/rust-lang/crates.io-index)" = "30885bcb161cf67054244d10d4a7f4835ffd58773bc72e07d35fecf472295503"
+"checksum md5 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "11f2f3240857d306c26118e2e92a5eaf8990df379e3d96573ee6c92cdbf58a81"
 "checksum memchr 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1dbccc0e46f1ea47b9f17e6d67c5a96bd27030519c519c9c91327e31275a47b4"
 "checksum nix 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "47e49f6982987135c5e9620ab317623e723bd06738fd85377e8d55f57c8b6487"
+"checksum nodrop 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "52cd74cd09beba596430cc6e3091b74007169a56246e1262f0ba451ea95117b2"
 "checksum num 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "a311b77ebdc5dd4cf6449d81e4135d9f0e3b153839ac90e648a8ef538f923525"
 "checksum num-integer 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)" = "d1452e8b06e448a07f0e6ebb0bb1d92b8890eea63288c0b627331d53514d0fba"
 "checksum num-iter 0.1.34 (registry+https://github.com/rust-lang/crates.io-index)" = "7485fcc84f85b4ecd0ea527b14189281cf27d60e583ae65ebc9c088b13dffe01"
 "checksum num-traits 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)" = "99843c856d68d8b4313b03a17e33c4bb42ae8f6610ea81b28abe076ac721b9b0"
 "checksum num_cpus 1.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "aec53c34f2d0247c5ca5d32cca1478762f301740468ee9ee6dcb7a0dd7a0c584"
+"checksum odds 0.2.25 (registry+https://github.com/rust-lang/crates.io-index)" = "c3df9b730298cea3a1c3faa90b7e2f9df3a9c400d0936d6015e6165734eefcba"
 "checksum onig 1.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1271a3f93197303deda8aedcd96ed2dbb908f61c0954ae70bf7a42f536dc35d7"
 "checksum onig_sys 65.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fbdee58fb75f5b7749ebc8f601f570961eed595dfe4c2bb9a542e2f7ae20b946"
 "checksum pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "3a8b4c6b8165cd1a1cd4b9b120978131389f64bdaf456435caa41e630edba903"
@@ -1507,13 +1588,15 @@ dependencies = [
 "checksum regex 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1731164734096285ec2a5ec7fea5248ae2f5485b3feeb0115af4fda2183b2d1b"
 "checksum regex-syntax 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ad890a5eef7953f55427c50575c680c42841653abd2b028b68cd223d157f62db"
 "checksum remove_dir_all 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0882bc41b0ba6131c7f0ce97233b62d8099e3f3abc60d4938185d3e35439c0cc"
-"checksum rust-crypto 0.2.36 (registry+https://github.com/rust-lang/crates.io-index)" = "f76d05d3993fd5f4af9434e8e436db163a12a9d40e1a58a726f27a01dfd12a2a"
 "checksum rustc-serialize 0.3.24 (registry+https://github.com/rust-lang/crates.io-index)" = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
 "checksum rustc_version 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "c5f5376ea5e30ce23c03eb77cbe4962b988deead10910c372b226388b594c084"
 "checksum same-file 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "d931a44fdaa43b8637009e7632a02adc4f2b2e0733c08caa4cf00e8da4a117a7"
 "checksum semver 0.1.20 (registry+https://github.com/rust-lang/crates.io-index)" = "d4f410fedcf71af0345d7607d246e7ad15faaadd49d240ee3b24e5dc21a820ac"
 "checksum semver 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3fdd61b85a0fa777f7fb7c454b9189b2941b110d1385ce84d7f76efdf1606a85"
 "checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
+"checksum sha1 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cc30b1e1e8c40c121ca33b86c23308a090d19974ef001b4bf6e61fd1a0fb095c"
+"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 strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b4d15c810519a91cf877e7e36e63fe068815c678181439f2f29e2562147c3694"
 "checksum tempdir 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "87974a6f5c1dfb344d733055601650059a3363de2a6104819293baff662132d6"
 "checksum tempfile 2.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3213fd2b7ed87e39306737ccfac04b1233b57a33ca64cfbf52f2ffaa2b765e2f"
@@ -1523,6 +1606,7 @@ dependencies = [
 "checksum textwrap 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f86300c3e7416ee233abd7cda890c492007a3980f941f79185c753a701257167"
 "checksum thread_local 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "1697c4b57aeeb7a536b647165a2825faddffb1d3bad386d507709bd51a90bb14"
 "checksum time 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)" = "d5d788d3aa77bc0ef3e9621256885555368b47bd495c13dd2e7413c89f845520"
+"checksum typenum 1.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "13a99dc6780ef33c78780b826cf9d2a78840b72cae9474de4bcaf9051e60ebbd"
 "checksum unicode-segmentation 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "18127285758f0e2c6cf325bb3f3d138a12fee27de4f23e146cd6a179f26c2cf3"
 "checksum unicode-width 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "bf3a113775714a22dcb774d8ea3655c53a32debae63a063acc00a91cc586245f"
 "checksum unindent 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3508be0ce1bacc38d579b69bffb4b8d469f5af0c388ff4890b2b294e61671ffe"
diff --git a/src/hashsum/digest.rs b/src/hashsum/digest.rs
index 098d5abe4..63ba505e7 100644
--- a/src/hashsum/digest.rs
+++ b/src/hashsum/digest.rs
@@ -5,7 +5,6 @@ extern crate sha1;
 extern crate sha2;
 extern crate sha3;
 
-use sha2::Digest as Sha2Digest;
 use digest::digest::{Input, ExtendableOutput, XofReader};
 
 pub trait Digest {
@@ -72,11 +71,11 @@ impl Digest for sha2::Sha224 {
     }
 
     fn input(&mut self, input: &[u8]) {
-        Sha2Digest::input(self, input);
+        digest::Digest::input(self, input);
     }
 
     fn result(&mut self, out: &mut [u8]) {
-        out.copy_from_slice(Sha2Digest::result(*self).as_slice());
+        out.copy_from_slice(digest::Digest::result(*self).as_slice());
     }
 
     fn reset(&mut self) {
@@ -92,11 +91,11 @@ impl Digest for sha2::Sha256 {
     }
 
     fn input(&mut self, input: &[u8]) {
-        Sha2Digest::input(self, input);
+        digest::Digest::input(self, input);
     }
 
     fn result(&mut self, out: &mut [u8]) {
-        out.copy_from_slice(Sha2Digest::result(*self).as_slice());
+        out.copy_from_slice(digest::Digest::result(*self).as_slice());
     }
 
     fn reset(&mut self) {
@@ -112,11 +111,11 @@ impl Digest for sha2::Sha384 {
     }
 
     fn input(&mut self, input: &[u8]) {
-        Sha2Digest::input(self, input)
+        digest::Digest::input(self, input)
     }
 
     fn result(&mut self, out: &mut [u8]) {
-        out.copy_from_slice(Sha2Digest::result(*self).as_slice());
+        out.copy_from_slice(digest::Digest::result(*self).as_slice());
     }
 
     fn reset(&mut self) {
@@ -132,11 +131,11 @@ impl Digest for sha2::Sha512 {
     }
 
     fn input(&mut self, input: &[u8]) {
-        Sha2Digest::input(self, input)
+        digest::Digest::input(self, input)
     }
 
     fn result(&mut self, out: &mut [u8]) {
-        out.copy_from_slice(Sha2Digest::result(*self).as_slice());
+        out.copy_from_slice(digest::Digest::result(*self).as_slice());
     }
 
     fn reset(&mut self) {