PolarSSL v1.2.5
pbkdf2.c
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1 
29 /*
30  * PBKDF2 is part of PKCS#5
31  *
32  * http://tools.ietf.org/html/rfc2898 (Specification)
33  * http://tools.ietf.org/html/rfc6070 (Test vectors)
34  */
35 
36 #include "polarssl/config.h"
37 
38 #if defined(POLARSSL_PBKDF2_C)
39 
40 #include "polarssl/pbkdf2.h"
41 
42 int pbkdf2_hmac( md_context_t *ctx, const unsigned char *password, size_t plen,
43  const unsigned char *salt, size_t slen,
44  unsigned int iteration_count,
45  uint32_t key_length, unsigned char *output )
46 {
47  int ret, j;
48  unsigned int i;
49  unsigned char md1[POLARSSL_MD_MAX_SIZE];
50  unsigned char work[POLARSSL_MD_MAX_SIZE];
51  unsigned char md_size = md_get_size( ctx->md_info );
52  size_t use_len;
53  unsigned char *out_p = output;
54  unsigned char counter[4];
55 
56  memset( counter, 0, 4 );
57  counter[3] = 1;
58 
59  if( iteration_count > 0xFFFFFFFF )
61 
62  while( key_length )
63  {
64  // U1 ends up in work
65  //
66  if( ( ret = md_hmac_starts( ctx, password, plen ) ) != 0 )
67  return( ret );
68 
69  if( ( ret = md_hmac_update( ctx, salt, slen ) ) != 0 )
70  return( ret );
71 
72  if( ( ret = md_hmac_update( ctx, counter, 4 ) ) != 0 )
73  return( ret );
74 
75  if( ( ret = md_hmac_finish( ctx, work ) ) != 0 )
76  return( ret );
77 
78  memcpy( md1, work, md_size );
79 
80  for ( i = 1; i < iteration_count; i++ )
81  {
82  // U2 ends up in md1
83  //
84  if( ( ret = md_hmac_starts( ctx, password, plen ) ) != 0 )
85  return( ret );
86 
87  if( ( ret = md_hmac_update( ctx, md1, md_size ) ) != 0 )
88  return( ret );
89 
90  if( ( ret = md_hmac_finish( ctx, md1 ) ) != 0 )
91  return( ret );
92 
93  // U1 xor U2
94  //
95  for( j = 0; j < md_size; j++ )
96  work[j] ^= md1[j];
97  }
98 
99  use_len = ( key_length < md_size ) ? key_length : md_size;
100  memcpy( out_p, work, use_len );
101 
102  key_length -= use_len;
103  out_p += use_len;
104 
105  for( i = 4; i > 0; i-- )
106  if( ++counter[i - 1] != 0 )
107  break;
108  }
109 
110  return( 0 );
111 }
112 
113 
114 #if defined(POLARSSL_SELF_TEST)
115 
116 #include <stdio.h>
117 
118 #define MAX_TESTS 6
119 
120 size_t plen[MAX_TESTS] =
121  { 8, 8, 8, 8, 24, 9 };
122 
123 unsigned char password[MAX_TESTS][32] =
124 {
125  "password",
126  "password",
127  "password",
128  "password",
129  "passwordPASSWORDpassword",
130  "pass\0word",
131 };
132 
133 size_t slen[MAX_TESTS] =
134  { 4, 4, 4, 4, 36, 5 };
135 
136 unsigned char salt[MAX_TESTS][40] =
137 {
138  "salt",
139  "salt",
140  "salt",
141  "salt",
142  "saltSALTsaltSALTsaltSALTsaltSALTsalt",
143  "sa\0lt",
144 };
145 
146 uint32_t it_cnt[MAX_TESTS] =
147  { 1, 2, 4096, 16777216, 4096, 4096 };
148 
149 uint32_t key_len[MAX_TESTS] =
150  { 20, 20, 20, 20, 25, 16 };
151 
152 
153 unsigned char result_key[MAX_TESTS][32] =
154 {
155  { 0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71,
156  0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06,
157  0x2f, 0xe0, 0x37, 0xa6 },
158  { 0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 0x8c,
159  0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 0x41, 0xf0,
160  0xd8, 0xde, 0x89, 0x57 },
161  { 0x4b, 0x00, 0x79, 0x01, 0xb7, 0x65, 0x48, 0x9a,
162  0xbe, 0xad, 0x49, 0xd9, 0x26, 0xf7, 0x21, 0xd0,
163  0x65, 0xa4, 0x29, 0xc1 },
164  { 0xee, 0xfe, 0x3d, 0x61, 0xcd, 0x4d, 0xa4, 0xe4,
165  0xe9, 0x94, 0x5b, 0x3d, 0x6b, 0xa2, 0x15, 0x8c,
166  0x26, 0x34, 0xe9, 0x84 },
167  { 0x3d, 0x2e, 0xec, 0x4f, 0xe4, 0x1c, 0x84, 0x9b,
168  0x80, 0xc8, 0xd8, 0x36, 0x62, 0xc0, 0xe4, 0x4a,
169  0x8b, 0x29, 0x1a, 0x96, 0x4c, 0xf2, 0xf0, 0x70,
170  0x38 },
171  { 0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d,
172  0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3 },
173 };
174 
175 int pbkdf2_self_test( int verbose )
176 {
177  md_context_t sha1_ctx;
178  const md_info_t *info_sha1;
179  int ret, i;
180  unsigned char key[64];
181 
182  info_sha1 = md_info_from_type( POLARSSL_MD_SHA1 );
183  if( info_sha1 == NULL )
184  return( 1 );
185 
186  if( ( ret = md_init_ctx( &sha1_ctx, info_sha1 ) ) != 0 )
187  return( 1 );
188 
189  for( i = 0; i < MAX_TESTS; i++ )
190  {
191  printf( " PBKDF2 (SHA1) #%d: ", i );
192 
193  ret = pbkdf2_hmac( &sha1_ctx, password[i], plen[i], salt[i], slen[i],
194  it_cnt[i], key_len[i], key );
195  if( ret != 0 ||
196  memcmp( result_key[i], key, key_len[i] ) != 0 )
197  {
198  if( verbose != 0 )
199  printf( "failed\n" );
200 
201  return( 1 );
202  }
203 
204  if( verbose != 0 )
205  printf( "passed\n" );
206  }
207 
208  printf( "\n" );
209 
210  return( 0 );
211 }
212 
213 #endif /* POLARSSL_SELF_TEST */
214 
215 #endif /* POLARSSL_PBKDF2_C */