diff --git a/decrypt.html b/decrypt.html
index 535981b..625dddd 100644
--- a/decrypt.html
+++ b/decrypt.html
@@ -13,6 +13,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <script src="prngCheck.js"></script>
   <script src="favicon.js"></script>
+  <script src="sha1.min.js"></script>
   <script src="openpgp.min.js"></script>
   <script>
   openpgp.initWorker({ path:'openpgp.worker.min.js' }) // set the relative web worker path
diff --git a/encrypt.html b/encrypt.html
index fd4bb8c..d831e35 100644
--- a/encrypt.html
+++ b/encrypt.html
@@ -13,6 +13,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <script src="prngCheck.js"></script>
   <script src="favicon.js"></script>
+  <script src="sha1.min.js"></script>
   <script src="openpgp.min.js"></script>
   <script>
   openpgp.initWorker({ path:'openpgp.worker.min.js' }) // set the relative web worker path
diff --git a/gen.html b/gen.html
index 971d7d1..2f2f000 100644
--- a/gen.html
+++ b/gen.html
@@ -13,6 +13,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <script src="prngCheck.js"></script>
   <script src="favicon.js"></script>
+  <script src="sha1.min.js"></script>
   <script src="openpgp.min.js"></script>
   <script>
   openpgp.initWorker({ path:'openpgp.worker.min.js' }) // set the relative web worker path
diff --git a/md5.js b/md5.js
deleted file mode 100644
index 6876bc3..0000000
--- a/md5.js
+++ /dev/null
@@ -1,184 +0,0 @@
-function md5cycle(x, k) {
-var a = x[0], b = x[1], c = x[2], d = x[3];
-
-a = ff(a, b, c, d, k[0], 7, -680876936);
-d = ff(d, a, b, c, k[1], 12, -389564586);
-c = ff(c, d, a, b, k[2], 17,  606105819);
-b = ff(b, c, d, a, k[3], 22, -1044525330);
-a = ff(a, b, c, d, k[4], 7, -176418897);
-d = ff(d, a, b, c, k[5], 12,  1200080426);
-c = ff(c, d, a, b, k[6], 17, -1473231341);
-b = ff(b, c, d, a, k[7], 22, -45705983);
-a = ff(a, b, c, d, k[8], 7,  1770035416);
-d = ff(d, a, b, c, k[9], 12, -1958414417);
-c = ff(c, d, a, b, k[10], 17, -42063);
-b = ff(b, c, d, a, k[11], 22, -1990404162);
-a = ff(a, b, c, d, k[12], 7,  1804603682);
-d = ff(d, a, b, c, k[13], 12, -40341101);
-c = ff(c, d, a, b, k[14], 17, -1502002290);
-b = ff(b, c, d, a, k[15], 22,  1236535329);
-
-a = gg(a, b, c, d, k[1], 5, -165796510);
-d = gg(d, a, b, c, k[6], 9, -1069501632);
-c = gg(c, d, a, b, k[11], 14,  643717713);
-b = gg(b, c, d, a, k[0], 20, -373897302);
-a = gg(a, b, c, d, k[5], 5, -701558691);
-d = gg(d, a, b, c, k[10], 9,  38016083);
-c = gg(c, d, a, b, k[15], 14, -660478335);
-b = gg(b, c, d, a, k[4], 20, -405537848);
-a = gg(a, b, c, d, k[9], 5,  568446438);
-d = gg(d, a, b, c, k[14], 9, -1019803690);
-c = gg(c, d, a, b, k[3], 14, -187363961);
-b = gg(b, c, d, a, k[8], 20,  1163531501);
-a = gg(a, b, c, d, k[13], 5, -1444681467);
-d = gg(d, a, b, c, k[2], 9, -51403784);
-c = gg(c, d, a, b, k[7], 14,  1735328473);
-b = gg(b, c, d, a, k[12], 20, -1926607734);
-
-a = hh(a, b, c, d, k[5], 4, -378558);
-d = hh(d, a, b, c, k[8], 11, -2022574463);
-c = hh(c, d, a, b, k[11], 16,  1839030562);
-b = hh(b, c, d, a, k[14], 23, -35309556);
-a = hh(a, b, c, d, k[1], 4, -1530992060);
-d = hh(d, a, b, c, k[4], 11,  1272893353);
-c = hh(c, d, a, b, k[7], 16, -155497632);
-b = hh(b, c, d, a, k[10], 23, -1094730640);
-a = hh(a, b, c, d, k[13], 4,  681279174);
-d = hh(d, a, b, c, k[0], 11, -358537222);
-c = hh(c, d, a, b, k[3], 16, -722521979);
-b = hh(b, c, d, a, k[6], 23,  76029189);
-a = hh(a, b, c, d, k[9], 4, -640364487);
-d = hh(d, a, b, c, k[12], 11, -421815835);
-c = hh(c, d, a, b, k[15], 16,  530742520);
-b = hh(b, c, d, a, k[2], 23, -995338651);
-
-a = ii(a, b, c, d, k[0], 6, -198630844);
-d = ii(d, a, b, c, k[7], 10,  1126891415);
-c = ii(c, d, a, b, k[14], 15, -1416354905);
-b = ii(b, c, d, a, k[5], 21, -57434055);
-a = ii(a, b, c, d, k[12], 6,  1700485571);
-d = ii(d, a, b, c, k[3], 10, -1894986606);
-c = ii(c, d, a, b, k[10], 15, -1051523);
-b = ii(b, c, d, a, k[1], 21, -2054922799);
-a = ii(a, b, c, d, k[8], 6,  1873313359);
-d = ii(d, a, b, c, k[15], 10, -30611744);
-c = ii(c, d, a, b, k[6], 15, -1560198380);
-b = ii(b, c, d, a, k[13], 21,  1309151649);
-a = ii(a, b, c, d, k[4], 6, -145523070);
-d = ii(d, a, b, c, k[11], 10, -1120210379);
-c = ii(c, d, a, b, k[2], 15,  718787259);
-b = ii(b, c, d, a, k[9], 21, -343485551);
-
-x[0] = add32(a, x[0]);
-x[1] = add32(b, x[1]);
-x[2] = add32(c, x[2]);
-x[3] = add32(d, x[3]);
-
-}
-
-function cmn(q, a, b, x, s, t) {
-a = add32(add32(a, q), add32(x, t));
-return add32((a << s) | (a >>> (32 - s)), b);
-}
-
-function ff(a, b, c, d, x, s, t) {
-return cmn((b & c) | ((~b) & d), a, b, x, s, t);
-}
-
-function gg(a, b, c, d, x, s, t) {
-return cmn((b & d) | (c & (~d)), a, b, x, s, t);
-}
-
-function hh(a, b, c, d, x, s, t) {
-return cmn(b ^ c ^ d, a, b, x, s, t);
-}
-
-function ii(a, b, c, d, x, s, t) {
-return cmn(c ^ (b | (~d)), a, b, x, s, t);
-}
-
-function md51(s) {
-txt = '';
-var n = s.length,
-state = [1732584193, -271733879, -1732584194, 271733878], i;
-for (i=64; i<=s.length; i+=64) {
-md5cycle(state, md5blk(s.substring(i-64, i)));
-}
-s = s.substring(i-64);
-var tail = [0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0];
-for (i=0; i<s.length; i++)
-tail[i>>2] |= s.charCodeAt(i) << ((i%4) << 3);
-tail[i>>2] |= 0x80 << ((i%4) << 3);
-if (i > 55) {
-md5cycle(state, tail);
-for (i=0; i<16; i++) tail[i] = 0;
-}
-tail[14] = n*8;
-md5cycle(state, tail);
-return state;
-}
-
-/* there needs to be support for Unicode here,
- * unless we pretend that we can redefine the MD-5
- * algorithm for multi-byte characters (perhaps
- * by adding every four 16-bit characters and
- * shortening the sum to 32 bits). Otherwise
- * I suggest performing MD-5 as if every character
- * was two bytes--e.g., 0040 0025 = @%--but then
- * how will an ordinary MD-5 sum be matched?
- * There is no way to standardize text to something
- * like UTF-8 before transformation; speed cost is
- * utterly prohibitive. The JavaScript standard
- * itself needs to look at this: it should start
- * providing access to strings as preformed UTF-8
- * 8-bit unsigned value arrays.
- */
-function md5blk(s) { /* I figured global was faster.   */
-var md5blks = [], i; /* Andy King said do it this way. */
-for (i=0; i<64; i+=4) {
-md5blks[i>>2] = s.charCodeAt(i)
-+ (s.charCodeAt(i+1) << 8)
-+ (s.charCodeAt(i+2) << 16)
-+ (s.charCodeAt(i+3) << 24);
-}
-return md5blks;
-}
-
-var hex_chr = '0123456789abcdef'.split('');
-
-function rhex(n)
-{
-var s='', j=0;
-for(; j<4; j++)
-s += hex_chr[(n >> (j * 8 + 4)) & 0x0F]
-+ hex_chr[(n >> (j * 8)) & 0x0F];
-return s;
-}
-
-function hex(x) {
-for (var i=0; i<x.length; i++)
-x[i] = rhex(x[i]);
-return x.join('');
-}
-
-function md5(s) {
-return hex(md51(s));
-}
-
-/* this function is much faster,
-so if possible we use it. Some IEs
-are the only ones I know of that
-need the idiotic second function,
-generated by an if clause.  */
-
-function add32(a, b) {
-return (a + b) & 0xFFFFFFFF;
-}
-
-if (md5('hello') != '5d41402abc4b2a76b9719d911017c592') {
-function add32(x, y) {
-var lsw = (x & 0xFFFF) + (y & 0xFFFF),
-msw = (x >> 16) + (y >> 16) + (lsw >> 16);
-return (msw << 16) | (lsw & 0xFFFF);
-}
-}
diff --git a/sign.html b/sign.html
index 593a457..40d8d4e 100644
--- a/sign.html
+++ b/sign.html
@@ -13,6 +13,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <script src="prngCheck.js"></script>
   <script src="favicon.js"></script>
+  <script src="sha1.min.js"></script>
   <script src="openpgp.min.js"></script>
   <script>
 
diff --git a/verify.html b/verify.html
index 8e5c5b3..5f1ddb0 100644
--- a/verify.html
+++ b/verify.html
@@ -13,6 +13,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <script src="prngCheck.js"></script>
   <script src="favicon.js"></script>
+  <script src="sha1.min.js"></script>
   <script src="openpgp.min.js"></script>
   <script>
   openpgp.initWorker({ path:'openpgp.worker.min.js' }) // set the relative web worker path