cvs.zerfleddert.de Git - proxmark3-svn/blob - client/fido/cose.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2018 Merlok
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // Tools for work with COSE (CBOR Object Signing and Encryption) rfc8152
   9 // https://tools.ietf.org/html/rfc8152
  10 //-----------------------------------------------------------------------------
  11 //
  12
  13 #include "cose.h"
  14 #include <cbor.h>
  15 #include "cbortools.h"
  16 #include "util.h"
  17 #include "ui.h"
  18
  19 static const char COSEEmptyStr[] = "";
  20
  21 typedef struct {
  22         int Value;
  23         char *Name;
  24         char *Description;
  25 } COSEValueNameDesc_t;
  26
  27 typedef struct {
  28         int Value;
  29         char *Type;
  30         char *Name;
  31         char *Description;
  32 } COSEValueTypeNameDesc_t;
  33
  34 // kty - Key Type Values
  35 COSEValueNameDesc_t COSEKeyTypeValueDesc[] = {
  36         {0, "Reserved",  "Reserved"},
  37         {1, "OKP",       "Octet Key Pair"},
  38         {2, "EC2",       "Elliptic Curve Key w/ x- and y-coordinate pair"},
  39         {4, "Symmetric", "Symmetric Key"},
  40 };
  41
  42 COSEValueNameDesc_t *GetCOSEktyElm(int id) {
  43         for (int i = 0; i < ARRAYLEN(COSEKeyTypeValueDesc); i++)
  44                 if (COSEKeyTypeValueDesc[i].Value == id)
  45                         return &COSEKeyTypeValueDesc[i];
  46         return NULL;
  47 }
  48
  49 const char *GetCOSEktyDescription(int id) {
  50         COSEValueNameDesc_t *elm = GetCOSEktyElm(id);
  51         if (elm)
  52                 return elm->Description;
  53         return COSEEmptyStr;
  54 }
  55
  56 // keys
  57 COSEValueTypeNameDesc_t COSECurvesDesc[] = {
  58         {1, "EC2", "P-256",    "NIST P-256 also known as secp256r1"},
  59         {2, "EC2", "P-384",    "NIST P-384 also known as secp384r1"},
  60         {3, "EC2", "P-521",    "NIST P-521 also known as secp521r1"},
  61         {4, "OKP", "X25519",   "X25519 for use w/ ECDH only"},
  62         {5, "OKP", "X448",     "X448 for use w/ ECDH only"},
  63         {6, "OKP", "Ed25519",  "Ed25519 for use w/ EdDSA only"},
  64         {7, "OKP", "Ed448",    "Ed448 for use w/ EdDSA only"},
  65 };
  66
  67 COSEValueTypeNameDesc_t *GetCOSECurveElm(int id) {
  68         for (int i = 0; i < ARRAYLEN(COSECurvesDesc); i++)
  69                 if (COSECurvesDesc[i].Value == id)
  70                         return &COSECurvesDesc[i];
  71         return NULL;
  72 }
  73
  74 const char *GetCOSECurveDescription(int id) {
  75         COSEValueTypeNameDesc_t *elm = GetCOSECurveElm(id);
  76         if (elm)
  77                 return elm->Description;
  78         return COSEEmptyStr;
  79 }
  80
  81 // RFC8152 https://www.iana.org/assignments/cose/cose.xhtml#algorithms
  82 COSEValueNameDesc_t COSEAlg[] = {
  83         {-65536,        "Unassigned",                           "Unassigned"},
  84         {-65535,        "RS1",                                          "RSASSA-PKCS1-v1_5 w/ SHA-1"},
  85         {-259,          "RS512",                                        "RSASSA-PKCS1-v1_5 w/ SHA-512"},
  86         {-258,          "RS384",                                        "RSASSA-PKCS1-v1_5 w/ SHA-384"},
  87         {-257,          "RS256",                                        "RSASSA-PKCS1-v1_5 w/ SHA-256"},
  88         {-42,           "RSAES-OAEP w/ SHA-512",        "RSAES-OAEP w/ SHA-512"},
  89         {-41,           "RSAES-OAEP w/ SHA-256",        "RSAES-OAEP w/ SHA-256"},
  90         {-40,           "RSAES-OAEP w/ RFC 8017 def param",     "RSAES-OAEP w/ SHA-1"},
  91         {-39,           "PS512",                                        "RSASSA-PSS w/ SHA-512"},
  92         {-38,           "PS384",                                        "RSASSA-PSS w/ SHA-384"},
  93         {-37,           "PS256",                                        "RSASSA-PSS w/ SHA-256"},
  94         {-36,           "ES512",                                        "ECDSA w/ SHA-512"},
  95         {-35,           "ES384",                                        "ECDSA w/ SHA-384"},
  96         {-34,           "ECDH-SS + A256KW",                     "ECDH SS w/ Concat KDF and AES Key Wrap w/ 256-bit key"},
  97         {-33,           "ECDH-SS + A192KW",                     "ECDH SS w/ Concat KDF and AES Key Wrap w/ 192-bit key"},
  98         {-32,           "ECDH-SS + A128KW",                     "ECDH SS w/ Concat KDF and AES Key Wrap w/ 128-bit key"},
  99         {-31,           "ECDH-ES + A256KW",                     "ECDH ES w/ Concat KDF and AES Key Wrap w/ 256-bit key"},
 100         {-30,           "ECDH-ES + A192KW",                     "ECDH ES w/ Concat KDF and AES Key Wrap w/ 192-bit key"},
 101         {-29,           "ECDH-ES + A128KW",                     "ECDH ES w/ Concat KDF and AES Key Wrap w/ 128-bit key"},
 102         {-28,           "ECDH-SS + HKDF-512",           "ECDH SS w/ HKDF - generate key directly"},
 103         {-27,           "ECDH-SS + HKDF-256",           "ECDH SS w/ HKDF - generate key directly"},
 104         {-26,           "ECDH-ES + HKDF-512",           "ECDH ES w/ HKDF - generate key directly"},
 105         {-25,           "ECDH-ES + HKDF-256",           "ECDH ES w/ HKDF - generate key directly"},
 106         {-13,           "direct+HKDF-AES-256",          "Shared secret w/ AES-MAC 256-bit key"},
 107         {-12,           "direct+HKDF-AES-128",          "Shared secret w/ AES-MAC 128-bit key"},
 108         {-11,           "direct+HKDF-SHA-512",          "Shared secret w/ HKDF and SHA-512"},
 109         {-10,           "direct+HKDF-SHA-256",          "Shared secret w/ HKDF and SHA-256"},
 110         {-8,            "EdDSA",                                        "EdDSA"},
 111         {-7,            "ES256",                                        "ECDSA w/ SHA-256"},
 112         {-6,            "direct",                                       "Direct use of CEK"},
 113         {-5,            "A256KW",                                       "AES Key Wrap w/ 256-bit key"},
 114         {-4,            "A192KW",                                       "AES Key Wrap w/ 192-bit key"},
 115         {-3,            "A128KW",                                       "AES Key Wrap w/ 128-bit key"},
 116         {0,                     "Reserved",                                     "Reserved"},
 117         {1,                     "A128GCM",                                      "AES-GCM mode w/ 128-bit key, 128-bit tag"},
 118         {2,                     "A192GCM",                                      "AES-GCM mode w/ 192-bit key, 128-bit tag"},
 119         {3,                     "A256GCM",                                      "AES-GCM mode w/ 256-bit key, 128-bit tag"},
 120         {4,                     "HMAC 256/64",                          "HMAC w/ SHA-256 truncated to 64 bits"},
 121         {5,                     "HMAC 256/256",                         "HMAC w/ SHA-256"},
 122         {6,                     "HMAC 384/384",                         "HMAC w/ SHA-384"},
 123         {7,                     "HMAC 512/512",                         "HMAC w/ SHA-512"},
 124         {10,            "AES-CCM-16-64-128",            "AES-CCM mode 128-bit key, 64-bit tag, 13-byte nonce"},
 125         {11,            "AES-CCM-16-64-256",            "AES-CCM mode 256-bit key, 64-bit tag, 13-byte nonce"},
 126         {12,            "AES-CCM-64-64-128",            "AES-CCM mode 128-bit key, 64-bit tag, 7-byte nonce"},
 127         {13,            "AES-CCM-64-64-256",            "AES-CCM mode 256-bit key, 64-bit tag, 7-byte nonce"},
 128         {14,            "AES-MAC 128/64",                       "AES-MAC 128-bit key, 64-bit tag"},
 129         {15,            "AES-MAC 256/64",                       "AES-MAC 256-bit key, 64-bit tag"},
 130         {24,            "ChaCha20/Poly1305",            "ChaCha20/Poly1305 w/ 256-bit key, 128-bit tag"},
 131         {25,            "AES-MAC 128/128",                      "AES-MAC 128-bit key, 128-bit tag"},
 132         {26,            "AES-MAC 256/128",                      "AES-MAC 256-bit key, 128-bit tag"},
 133         {30,            "AES-CCM-16-128-128",           "AES-CCM mode 128-bit key, 128-bit tag, 13-byte nonce"},
 134         {31,            "AES-CCM-16-128-256",           "AES-CCM mode 256-bit key, 128-bit tag, 13-byte nonce"},
 135         {32,            "AES-CCM-64-128-128",           "AES-CCM mode 128-bit key, 128-bit tag, 7-byte nonce"},
 136         {33,            "AES-CCM-64-128-256",           "AES-CCM mode 256-bit key, 128-bit tag, 7-byte nonce"}
 137 };
 138
 139 COSEValueNameDesc_t *GetCOSEAlgElm(int id) {
 140         for (int i = 0; i < ARRAYLEN(COSEAlg); i++)
 141                 if (COSEAlg[i].Value == id)
 142                         return &COSEAlg[i];
 143         return NULL;
 144 }
 145
 146 const char *GetCOSEAlgName(int id) {
 147         COSEValueNameDesc_t *elm = GetCOSEAlgElm(id);
 148         if (elm)
 149                 return elm->Name;
 150         return COSEEmptyStr;
 151 }
 152
 153 const char *GetCOSEAlgDescription(int id) {
 154         COSEValueNameDesc_t *elm = GetCOSEAlgElm(id);
 155         if (elm)
 156                 return elm->Description;
 157         return COSEEmptyStr;
 158 }
 159
 160 int COSEGetECDSAKey(uint8_t *data, size_t datalen, bool verbose, uint8_t *public_key) {
 161         CborParser parser;
 162         CborValue map;
 163         int64_t i64;
 164         size_t len;
 165
 166         if(verbose)
 167                 PrintAndLog("----------- CBOR decode ----------------");
 168
 169         // kty
 170         int res = CborMapGetKeyById(&parser, &map, data, datalen, 1);
 171         if(!res) {
 172                 cbor_value_get_int64(&map, &i64);
 173                 if(verbose)
 174                         PrintAndLog("kty [%lld] %s", (long long)i64, GetCOSEktyDescription(i64));
 175                 if (i64 != 2)
 176                         PrintAndLog("ERROR: kty must be 2.");
 177         }
 178
 179         // algorithm
 180         res = CborMapGetKeyById(&parser, &map, data, datalen, 3);
 181         if(!res) {
 182                 cbor_value_get_int64(&map, &i64);
 183                 if(verbose)
 184                         PrintAndLog("algorithm [%lld] %s", (long long)i64, GetCOSEAlgDescription(i64));
 185                 if (i64 != -7)
 186                         PrintAndLog("ERROR: algorithm must be -7.");
 187         }
 188
 189         // curve
 190         res = CborMapGetKeyById(&parser, &map, data, datalen, -1);
 191         if(!res) {
 192                 cbor_value_get_int64(&map, &i64);
 193                 if(verbose)
 194                         PrintAndLog("curve [%lld] %s", (long long)i64, GetCOSECurveDescription(i64));
 195                 if (i64 != 1)
 196                         PrintAndLog("ERROR: curve must be 1.");
 197         }
 198
 199         // plain key
 200         public_key[0] = 0x04;
 201
 202         // x - coordinate
 203         res = CborMapGetKeyById(&parser, &map, data, datalen, -2);
 204         if(!res) {
 205                 res = CborGetBinStringValue(&map, &public_key[1], 32, &len);
 206                 cbor_check(res);
 207                 if(verbose)
 208                         PrintAndLog("x - coordinate [%d]: %s", len, sprint_hex(&public_key[1], 32));
 209                 if (len != 32)
 210                         PrintAndLog("ERROR: x - coordinate length must be 32.");
 211         }
 212
 213         // y - coordinate
 214         res = CborMapGetKeyById(&parser, &map, data, datalen, -3);
 215         if(!res) {
 216                 res = CborGetBinStringValue(&map, &public_key[33], 32, &len);
 217                 cbor_check(res);
 218                 if(verbose)
 219                         PrintAndLog("y - coordinate [%d]: %s", len, sprint_hex(&public_key[33], 32));
 220                 if (len != 32)
 221                         PrintAndLog("ERROR: y - coordinate length must be 32.");
 222         }
 223
 224         // d - private key
 225         uint8_t private_key[128] = {0};
 226         res = CborMapGetKeyById(&parser, &map, data, datalen, -4);
 227         if(!res) {
 228                 res = CborGetBinStringValue(&map, private_key, sizeof(private_key), &len);
 229                 cbor_check(res);
 230                 if(verbose)
 231                         PrintAndLog("d - private key [%d]: %s", len, sprint_hex(private_key, len));
 232         }
 233
 234         if(verbose)
 235                 PrintAndLog("----------- CBOR decode ----------------");
 236
 237         return 0;
 238 }
 239
 240