--- /dev/null
+/*
+ * Copyright (c) 2007-2008,2010,2012-2013 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <stdlib.h>
+#include <string.h> // memcpy
+
+#include <CommonCrypto/CommonDigest.h>
+#include <CommonCrypto/CommonDigestSPI.h>
+
+#include <corecrypto/ccn.h>
+
+#include "p12pbegen.h"
+
+static uint8_t *concatenate_to_blocksize(const uint8_t *data, size_t data_length,
+ size_t blocksize, size_t *blocklength)
+{
+ size_t block_length = blocksize * ((data_length + blocksize - 1) / blocksize);
+ uint8_t *block_ptr, *block;
+ block_ptr = block = malloc(block_length);
+ if (!block_ptr)
+ return NULL;
+ while (block_ptr < block + block_length) {
+ size_t bytes_to_move = block + block_length - block_ptr;
+ memcpy(block_ptr, data, bytes_to_move > data_length ? data_length : bytes_to_move);
+ block_ptr += data_length;
+ }
+ *blocklength = block_length;
+ return block;
+}
+
+int p12_pbe_gen(CFStringRef passphrase, uint8_t *salt_ptr, size_t salt_length,
+ unsigned iter_count, P12_PBE_ID pbe_id, uint8_t *data, size_t length)
+{
+ unsigned int hash_blocksize = CC_SHA1_BLOCK_BYTES;
+ unsigned int hash_outputsize = CC_SHA1_DIGEST_LENGTH;
+
+ if (!passphrase)
+ return -1;
+
+ /* generate diversifier block */
+ unsigned char diversifier[hash_blocksize];
+ memset(diversifier, pbe_id, sizeof(diversifier));
+
+ /* convert passphrase to BE UTF16 and append double null */
+ CFDataRef passphrase_be_unicode = CFStringCreateExternalRepresentation(kCFAllocatorDefault, passphrase, kCFStringEncodingUTF16BE, '\0');
+ if (!passphrase_be_unicode)
+ return -1;
+ uint8_t null_termination[2] = { 0, 0 };
+ CFMutableDataRef passphrase_be_unicode_null_term = CFDataCreateMutableCopy(NULL, 0, passphrase_be_unicode);
+ CFRelease(passphrase_be_unicode);
+ if (!passphrase_be_unicode_null_term)
+ return -1;
+ CFDataAppendBytes(passphrase_be_unicode_null_term, null_termination, sizeof(null_termination));
+
+ /* generate passphrase block */
+ uint8_t *passphrase_data = NULL;
+ size_t passphrase_data_len = 0;
+ size_t passphrase_length = CFDataGetLength(passphrase_be_unicode_null_term);
+ const unsigned char *passphrase_ptr = CFDataGetBytePtr(passphrase_be_unicode_null_term);
+ passphrase_data = concatenate_to_blocksize(passphrase_ptr, passphrase_length, hash_blocksize, &passphrase_data_len);
+ CFRelease(passphrase_be_unicode_null_term);
+ if (!passphrase_data)
+ return -1;
+
+ /* generate salt block */
+ uint8_t *salt_data = NULL;
+ size_t salt_data_len = 0;
+ if (salt_length)
+ salt_data = concatenate_to_blocksize(salt_ptr, salt_length, hash_blocksize, &salt_data_len);
+ if (!salt_data){
+ free(passphrase_data);
+ return -1;
+ }
+ /* generate S||P block */
+ size_t I_length = salt_data_len + passphrase_data_len;
+ uint8_t *I_data = malloc(I_length);
+ if (!I_data){
+ free(salt_data);
+ free(passphrase_data);
+ return -1;
+ }
+ memcpy(I_data + 0, salt_data, salt_data_len);
+ memcpy(I_data + salt_data_len, passphrase_data, passphrase_data_len);
+ free(salt_data);
+ free(passphrase_data);
+
+ /* round up output buffer to multiple of hash block size and allocate */
+ size_t hash_output_blocks = (length + hash_outputsize - 1) / hash_outputsize;
+ size_t temp_buf_size = hash_output_blocks * hash_outputsize;
+ uint8_t *temp_buf = malloc(temp_buf_size);
+ uint8_t *cursor = temp_buf;
+ if (!temp_buf){
+ free(I_data);
+ return -1;
+ }
+ /* 64 bits cast(s): worst case here is we dont hash all the data and incorectly derive the wrong key,
+ when the passphrase + salt are over 2^32 bytes long */
+ /* loop over output in hash_output_size increments */
+ while (cursor < temp_buf + temp_buf_size) {
+ CC_SHA1_CTX ctx;
+ CC_SHA1_Init(&ctx);
+ CC_SHA1_Update(&ctx, diversifier, (CC_LONG)sizeof(diversifier));
+ assert(I_length<=UINT32_MAX); /* debug check. Correct as long as CC_LONG is uint32_t */
+ CC_SHA1_Update(&ctx, I_data, (CC_LONG)I_length);
+ CC_SHA1_Final(cursor, &ctx);
+
+ /* run block through SHA-1 for iteration count */
+ unsigned int i;
+ for (i = 1; /*first round done above*/ i < iter_count; i++)
+ CCDigest(kCCDigestSHA1, cursor, hash_outputsize, cursor);
+
+ /*
+ * b) Concatenate copies of A[i] to create a string B of
+ * length v bits (the final copy of A[i]i may be truncated
+ * to create B).
+ */
+ size_t A_i_len = 0;
+ uint8_t *A_i = concatenate_to_blocksize(cursor,
+ hash_outputsize, hash_blocksize, &A_i_len);
+ if (!A_i){
+ free(I_data);
+ free(temp_buf);
+ return -1;
+ }
+ /*
+ * c) Treating I as a concatenation I[0], I[1], ...,
+ * I[k-1] of v-bit blocks, where k = ceil(s/v) + ceil(p/v),
+ * modify I by setting I[j]=(I[j]+B+1) mod (2 ** v)
+ * for each j.
+ */
+
+ /* tmp1 = B+1 */
+
+ const cc_size tmp_n = ccn_nof_size(A_i_len + 1) > ccn_nof_size(hash_blocksize) ? ccn_nof_size(A_i_len + 1) : ccn_nof_size(hash_blocksize);
+ cc_unit tmp1[tmp_n];
+ ccn_read_uint(tmp_n, tmp1, A_i_len, A_i);
+ ccn_add1(tmp_n, tmp1, tmp1, 1);
+
+ free(A_i);
+
+ cc_unit tmp2[tmp_n];
+ unsigned int j;
+ for (j = 0; j < I_length; j+=hash_blocksize) {
+ /* tempg = I[j]; */
+ ccn_read_uint(tmp_n, tmp2, hash_blocksize, I_data + j);
+ /* tempg += tmp1 */
+ ccn_add(tmp_n, tmp2, tmp2, tmp1);
+
+ /* I[j] = tempg mod 2**v
+ Just clear all the high bits above 2**v
+ In practice at most it rolled over by 1 bit, since all we did was add so
+ we should only clear one bit at most.
+ */
+ size_t bitSize;
+ const size_t hash_blocksize_bits = hash_blocksize * 8;
+ while ((bitSize = ccn_bitlen(tmp_n, tmp2)) > hash_blocksize_bits)
+ {
+ ccn_set_bit(tmp2, bitSize - 1, 0);
+ }
+
+ ccn_write_uint_padded(tmp_n, tmp2, hash_blocksize, I_data + j);
+ }
+
+ cursor += hash_outputsize;
+ }
+
+ /*
+ * 7. Concatenate A[1], A[2], ..., A[c] together to form a
+ * pseudo-random bit string, A.
+ *
+ * 8. Use the first n bits of A as the output of this entire
+ * process.
+ */
+ memmove(data, temp_buf, length);
+ free(temp_buf);
+ free(I_data);
+ return 0;
+}
+
+#if 0
+bool test()
+{
+ //smeg => 0073006D006500670000
+ CFStringRef password = CFSTR("smeg");
+ //Salt (length 8):
+ unsigned char salt_bytes[] = { 0x0A, 0x58, 0xCF, 0x64, 0x53, 0x0D, 0x82, 0x3F };
+ CFDataRef salt = CFDataCreate(NULL, salt_bytes, sizeof(salt_bytes));
+ // ID 1, ITER 1
+ // Output KEY (length 24)
+ unsigned char correct_result[] = { 0x8A, 0xAA, 0xE6, 0x29, 0x7B, 0x6C, 0xB0, 0x46, 0x42, 0xAB, 0x5B, 0x07, 0x78, 0x51, 0x28, 0x4E, 0xB7, 0x12, 0x8F, 0x1A, 0x2A, 0x7F, 0xBC, 0xA3 };
+ unsigned char result[24];
+ p12PbeGen(password, salt, 1, PBE_ID_Key, result, sizeof(result));
+ if (memcmp(correct_result, result, sizeof(correct_result))) {
+ printf("test failure\n");
+ return false;
+ }
+ return true;
+}
+
+bool test2()
+{
+ CFStringRef password = CFSTR("queeg");
+ unsigned char salt_bytes[] = { 0x05,0xDE,0xC9,0x59,0xAC,0xFF,0x72,0xF7 };
+ CFDataRef salt = CFDataCreate(NULL, salt_bytes, sizeof(salt_bytes));
+ unsigned char correct_result[] = { 0xED,0x20,0x34,0xE3,0x63,0x28,0x83,0x0F,0xF0,0x9D,0xF1,0xE1,0xA0,0x7D,0xD3,0x57,0x18,0x5D,0xAC,0x0D,0x4F,0x9E,0xB3,0xD4 };
+ unsigned char result[24];
+ p12PbeGen(password, salt, 1000, PBE_ID_Key, result, sizeof(result));
+ if (memcmp(correct_result, result, sizeof(correct_result))) {
+ printf("test failure\n");
+ return false;
+ }
+ return true;
+}
+
+int main(int argc, char *argv[])
+{
+ test();
+ test2();
+}
+
+#endif
+
+/* http://www.drh-consultancy.demon.co.uk/test.txt
+
+ Test Vectors set 1.
+
+ Password: smeg
+
+KEYGEN DEBUG
+ID 1, ITER 1
+Password (length 10):
+0073006D006500670000
+Salt (length 8):
+0A58CF64530D823F
+ID 1, ITER 1
+Output KEY (length 24)
+8AAAE6297B6CB04642AB5B077851284EB7128F1A2A7FBCA3
+
+KEYGEN DEBUG
+ID 2, ITER 1
+Password (length 10):
+0073006D006500670000
+Salt (length 8):
+0A58CF64530D823F
+ID 2, ITER 1
+Output KEY (length 8)
+79993DFE048D3B76
+
+KEYGEN DEBUG
+ID 1, ITER 1
+Password (length 10):
+0073006D006500670000
+Salt (length 8):
+642B99AB44FB4B1F
+ID 1, ITER 1
+Output KEY (length 24)
+F3A95FEC48D7711E985CFE67908C5AB79FA3D7C5CAA5D966
+
+KEYGEN DEBUG
+ID 2, ITER 1
+Password (length 10):
+0073006D006500670000
+Salt (length 8):
+642B99AB44FB4B1F
+ID 2, ITER 1
+Output KEY (length 8)
+C0A38D64A79BEA1D
+
+KEYGEN DEBUG
+ID 3, ITER 1
+Password (length 10):
+0073006D006500670000
+Salt (length 8):
+3D83C0E4546AC140
+ID 3, ITER 1
+Output KEY (length 20)
+8D967D88F6CAA9D714800AB3D48051D63F73A312
+
+Test Vectors set 2.
+Password: queeg
+
+KEYGEN DEBUG
+ID 1, ITER 1000
+Password (length 12):
+007100750065006500670000
+Salt (length 8):
+05DEC959ACFF72F7
+ID 1, ITER 1000
+Output KEY (length 24)
+ED2034E36328830FF09DF1E1A07DD357185DAC0D4F9EB3D4
+
+KEYGEN DEBUG
+ID 2, ITER 1000
+Password (length 12):
+007100750065006500670000
+Salt (length 8):
+05DEC959ACFF72F7
+ID 2, ITER 1000
+Output KEY (length 8)
+11DEDAD7758D4860
+
+KEYGEN DEBUG
+ID 1, ITER 1000
+Password (length 12):
+007100750065006500670000
+Salt (length 8):
+1682C0FC5B3F7EC5
+ID 1, ITER 1000
+Output KEY (length 24)
+483DD6E919D7DE2E8E648BA8F862F3FBFBDC2BCB2C02957F
+
+KEYGEN DEBUG
+ID 2, ITER 1000
+Password (length 12):
+007100750065006500670000
+Salt (length 8):
+1682C0FC5B3F7EC5
+ID 2, ITER 1000
+Output KEY (length 8)
+9D461D1B00355C50
+
+KEYGEN DEBUG
+ID 3, ITER 1000
+Password (length 12):
+007100750065006500670000
+Salt (length 8):
+263216FCC2FAB31C
+ID 3, ITER 1000
+Output KEY (length 20)
+5EC4C7A80DF652294C3925B6489A7AB857C83476
+*/
+
projects / apple / security.git / blobdiff