--- /dev/null
+# This file is part of NIT (http://www.nitlanguage.org).
+#
+# Copyright 2014 Lucas Bajolet <r4pass@hotmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Provides methods to compute the SHA1 hash of a String
+module sha1
+
+in "C Header" `{
+
+ /* This code is public-domain - it is based on libcrypt
+ * placed in the public domain by Wei Dai and other contributors.
+ */
+
+ #include <stdint.h>
+ #include <string.h>
+
+ #define HASH_LENGTH 20
+ #define BLOCK_LENGTH 64
+
+ union _buffer {
+ uint8_t b[BLOCK_LENGTH];
+ uint32_t w[BLOCK_LENGTH/4];
+ };
+
+ union _state {
+ uint8_t b[HASH_LENGTH];
+ uint32_t w[HASH_LENGTH/4];
+ };
+
+ typedef struct sha1nfo {
+ union _buffer buffer;
+ uint8_t bufferOffset;
+ union _state state;
+ uint32_t byteCount;
+ uint8_t keyBuffer[BLOCK_LENGTH];
+ uint8_t innerHash[HASH_LENGTH];
+ } sha1nfo;
+
+ /**
+ */
+ void sha1_init(sha1nfo *s);
+ /**
+ */
+ void sha1_writebyte(sha1nfo *s, uint8_t data);
+ /**
+ */
+ void sha1_write(sha1nfo *s, const char *data, size_t len);
+ /**
+ */
+ uint8_t* sha1_result(sha1nfo *s);
+ /**
+ */
+ void sha1_initHmac(sha1nfo *s, const uint8_t* key, int keyLength);
+ /**
+ */
+ uint8_t* sha1_resultHmac(sha1nfo *s);
+`}
+
+`{
+ #define SHA1_K0 0x5a827999
+ #define SHA1_K20 0x6ed9eba1
+ #define SHA1_K40 0x8f1bbcdc
+ #define SHA1_K60 0xca62c1d6
+
+ const uint8_t sha1InitState[] = {
+ 0x01,0x23,0x45,0x67, // H0
+ 0x89,0xab,0xcd,0xef, // H1
+ 0xfe,0xdc,0xba,0x98, // H2
+ 0x76,0x54,0x32,0x10, // H3
+ 0xf0,0xe1,0xd2,0xc3 // H4
+ };
+
+ void sha1_init(sha1nfo *s) {
+ memcpy(s->state.b,sha1InitState,HASH_LENGTH);
+ s->byteCount = 0;
+ s->bufferOffset = 0;
+ }
+
+ uint32_t sha1_rol32(uint32_t number, uint8_t bits) {
+ return ((number << bits) | (number >> (32-bits)));
+ }
+
+ void sha1_hashBlock(sha1nfo *s) {
+ uint8_t i;
+ uint32_t a,b,c,d,e,t;
+
+ a=s->state.w[0];
+ b=s->state.w[1];
+ c=s->state.w[2];
+ d=s->state.w[3];
+ e=s->state.w[4];
+ for (i=0; i<80; i++) {
+ if (i>=16) {
+ t = s->buffer.w[(i+13)&15] ^ s->buffer.w[(i+8)&15] ^ s->buffer.w[(i+2)&15] ^ s->buffer.w[i&15];
+ s->buffer.w[i&15] = sha1_rol32(t,1);
+ }
+ if (i<20) {
+ t = (d ^ (b & (c ^ d))) + SHA1_K0;
+ } else if (i<40) {
+ t = (b ^ c ^ d) + SHA1_K20;
+ } else if (i<60) {
+ t = ((b & c) | (d & (b | c))) + SHA1_K40;
+ } else {
+ t = (b ^ c ^ d) + SHA1_K60;
+ }
+ t+=sha1_rol32(a,5) + e + s->buffer.w[i&15];
+ e=d;
+ d=c;
+ c=sha1_rol32(b,30);
+ b=a;
+ a=t;
+ }
+ s->state.w[0] += a;
+ s->state.w[1] += b;
+ s->state.w[2] += c;
+ s->state.w[3] += d;
+ s->state.w[4] += e;
+ }
+
+ void sha1_addUncounted(sha1nfo *s, uint8_t data) {
+ s->buffer.b[s->bufferOffset ^ 3] = data;
+ s->bufferOffset++;
+ if (s->bufferOffset == BLOCK_LENGTH) {
+ sha1_hashBlock(s);
+ s->bufferOffset = 0;
+ }
+ }
+
+ void sha1_writebyte(sha1nfo *s, uint8_t data) {
+ ++s->byteCount;
+ sha1_addUncounted(s, data);
+ }
+
+ void sha1_write(sha1nfo *s, const char *data, size_t len) {
+ for (;len--;) sha1_writebyte(s, (uint8_t) *data++);
+ }
+
+ void sha1_pad(sha1nfo *s) {
+ // Implement SHA-1 padding (fips180-2 ยง5.1.1)
+
+ // Pad with 0x80 followed by 0x00 until the end of the block
+ sha1_addUncounted(s, 0x80);
+ while (s->bufferOffset != 56) sha1_addUncounted(s, 0x00);
+
+ // Append length in the last 8 bytes
+ sha1_addUncounted(s, 0); // We're only using 32 bit lengths
+ sha1_addUncounted(s, 0); // But SHA-1 supports 64 bit lengths
+ sha1_addUncounted(s, 0); // So zero pad the top bits
+ sha1_addUncounted(s, s->byteCount >> 29); // Shifting to multiply by 8
+ sha1_addUncounted(s, s->byteCount >> 21); // as SHA-1 supports bitstreams as well as
+ sha1_addUncounted(s, s->byteCount >> 13); // byte.
+ sha1_addUncounted(s, s->byteCount >> 5);
+ sha1_addUncounted(s, s->byteCount << 3);
+ }
+
+ uint8_t* sha1_result(sha1nfo *s) {
+ int i;
+ // Pad to complete the last block
+ sha1_pad(s);
+
+ // Swap byte order back
+ for (i=0; i<5; i++) {
+ uint32_t a,b;
+ a=s->state.w[i];
+ b=a<<24;
+ b|=(a<<8) & 0x00ff0000;
+ b|=(a>>8) & 0x0000ff00;
+ b|=a>>24;
+ s->state.w[i]=b;
+ }
+
+ // Return pointer to hash (20 characters)
+ return s->state.b;
+ }
+
+ #define HMAC_IPAD 0x36
+ #define HMAC_OPAD 0x5c
+
+ void sha1_initHmac(sha1nfo *s, const uint8_t* key, int keyLength) {
+ uint8_t i;
+ memset(s->keyBuffer, 0, BLOCK_LENGTH);
+ if (keyLength > BLOCK_LENGTH) {
+ // Hash long keys
+ sha1_init(s);
+ for (;keyLength--;) sha1_writebyte(s, *key++);
+ memcpy(s->keyBuffer, sha1_result(s), HASH_LENGTH);
+ } else {
+ // Block length keys are used as is
+ memcpy(s->keyBuffer, key, keyLength);
+ }
+ // Start inner hash
+ sha1_init(s);
+ for (i=0; i<BLOCK_LENGTH; i++) {
+ sha1_writebyte(s, s->keyBuffer[i] ^ HMAC_IPAD);
+ }
+ }
+
+ uint8_t* sha1_resultHmac(sha1nfo *s) {
+ uint8_t i;
+ // Complete inner hash
+ memcpy(s->innerHash,sha1_result(s),HASH_LENGTH);
+ // Calculate outer hash
+ sha1_init(s);
+ for (i=0; i<BLOCK_LENGTH; i++) sha1_writebyte(s, s->keyBuffer[i] ^ HMAC_OPAD);
+ for (i=0; i<HASH_LENGTH; i++) sha1_writebyte(s, s->innerHash[i]);
+ return sha1_result(s);
+ }
+`}
+
+redef class String
+
+ # Computes the SHA1 of the receiver
+ #
+ # Returns a digest of 20 bytes as a String,
+ # note that all the characters are not necessarily ASCII.
+ # If you want the hex string version of the digest, use
+ # sha1_to_s.
+ #
+ # assert "The quick brown fox jumps over the lazy dog".sha1.encode_base64 == "L9ThxnotKPzthJ7hu3bnORuT6xI="
+ fun sha1: String import String.to_cstring, String.length, NativeString.to_s_with_length `{
+ uint32_t a;
+ sha1nfo s;
+
+ sha1_init(&s);
+ sha1_write(&s, String_to_cstring(recv), String_length(recv));
+ uint8_t* digest = sha1_result(&s);
+
+ char* digested = malloc(21);
+
+ memcpy(digested, digest, 20);
+
+ digested[20] = '\0';
+
+ return NativeString_to_s_with_length(digested, 20);
+ `}
+
+ # Computes the SHA1 of the receiver.
+ #
+ # Returns a 40 char String containing the Hexadecimal
+ # Digest in its Char form.
+ #
+ # assert "The quick brown fox jumps over the lazy dog".sha1_to_s == "2FD4E1C67A2D28FCED849EE1BB76E7391B93EB12"
+ fun sha1_to_s: String import String.to_cstring, String.length, NativeString.to_s_with_length `{
+ uint32_t a;
+ sha1nfo s;
+
+ sha1_init(&s);
+ sha1_write(&s, String_to_cstring(recv), String_length(recv));
+ uint8_t* digest = sha1_result(&s);
+
+ char* ret_str = malloc(41);
+ char* hexmap = "0123456789ABCDEF";
+
+ int i;
+ for(i=0;i<20;i++){
+ uint8_t q = digest[i];
+ ret_str[i*2] = hexmap[q >> 4];
+ ret_str[(i*2)+1] = hexmap[q & 0x0F];
+ }
+ ret_str[40] = '\0';
+
+ return NativeString_to_s_with_length(ret_str, 40);
+ `}
+
+end
+
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