proxmark3/client/fido/cose.c

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2018-11-26 22:12:28 +08:00
//-----------------------------------------------------------------------------
// Copyright (C) 2018 Merlok
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Tools for work with COSE (CBOR Object Signing and Encryption) rfc8152
// https://tools.ietf.org/html/rfc8152
//-----------------------------------------------------------------------------
//
#include "cose.h"
#include <cbor.h>
#include "cbortools.h"
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#include "util.h"
static const char COSEEmptyStr[] = "";
typedef struct {
int Value;
char *Name;
char *Description;
} COSEValueNameDesc_t;
typedef struct {
int Value;
char *Type;
char *Name;
char *Description;
} COSEValueTypeNameDesc_t;
// kty - Key Type Values
COSEValueNameDesc_t COSEKeyTypeValueDesc[] = {
{0, "Reserved", "Reserved"},
{1, "OKP", "Octet Key Pair"},
{2, "EC2", "Elliptic Curve Key w/ x- and y-coordinate pair"},
{4, "Symmetric", "Symmetric Key"},
};
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COSEValueNameDesc_t *GetCOSEktyElm(int id) {
for (int i = 0; i < ARRAYLEN(COSEKeyTypeValueDesc); i++)
if (COSEKeyTypeValueDesc[i].Value == id)
return &COSEKeyTypeValueDesc[i];
return NULL;
}
const char *GetCOSEktyDescription(int id) {
COSEValueNameDesc_t *elm = GetCOSEktyElm(id);
if (elm)
return elm->Description;
return COSEEmptyStr;
}
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// keys
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COSEValueTypeNameDesc_t COSECurvesDesc[] = {
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{1, "EC2", "P-256", "NIST P-256 also known as secp256r1"},
{2, "EC2", "P-384", "NIST P-384 also known as secp384r1"},
{3, "EC2", "P-521", "NIST P-521 also known as secp521r1"},
{4, "OKP", "X25519", "X25519 for use w/ ECDH only"},
{5, "OKP", "X448", "X448 for use w/ ECDH only"},
{6, "OKP", "Ed25519", "Ed25519 for use w/ EdDSA only"},
{7, "OKP", "Ed448", "Ed448 for use w/ EdDSA only"},
};
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COSEValueTypeNameDesc_t *GetCOSECurveElm(int id) {
for (int i = 0; i < ARRAYLEN(COSECurvesDesc); i++)
if (COSECurvesDesc[i].Value == id)
return &COSECurvesDesc[i];
return NULL;
}
const char *GetCOSECurveDescription(int id) {
COSEValueTypeNameDesc_t *elm = GetCOSECurveElm(id);
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if (elm)
return elm->Description;
return COSEEmptyStr;
}
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// RFC8152 https://www.iana.org/assignments/cose/cose.xhtml#algorithms
COSEValueNameDesc_t COSEAlg[] = {
{-65536, "Unassigned", "Unassigned"},
{-65535, "RS1", "RSASSA-PKCS1-v1_5 w/ SHA-1"},
{-259, "RS512", "RSASSA-PKCS1-v1_5 w/ SHA-512"},
{-258, "RS384", "RSASSA-PKCS1-v1_5 w/ SHA-384"},
{-257, "RS256", "RSASSA-PKCS1-v1_5 w/ SHA-256"},
{-42, "RSAES-OAEP w/ SHA-512", "RSAES-OAEP w/ SHA-512"},
{-41, "RSAES-OAEP w/ SHA-256", "RSAES-OAEP w/ SHA-256"},
{-40, "RSAES-OAEP w/ RFC 8017 def param", "RSAES-OAEP w/ SHA-1"},
{-39, "PS512", "RSASSA-PSS w/ SHA-512"},
{-38, "PS384", "RSASSA-PSS w/ SHA-384"},
{-37, "PS256", "RSASSA-PSS w/ SHA-256"},
{-36, "ES512", "ECDSA w/ SHA-512"},
{-35, "ES384", "ECDSA w/ SHA-384"},
{-34, "ECDH-SS + A256KW", "ECDH SS w/ Concat KDF and AES Key Wrap w/ 256-bit key"},
{-33, "ECDH-SS + A192KW", "ECDH SS w/ Concat KDF and AES Key Wrap w/ 192-bit key"},
{-32, "ECDH-SS + A128KW", "ECDH SS w/ Concat KDF and AES Key Wrap w/ 128-bit key"},
{-31, "ECDH-ES + A256KW", "ECDH ES w/ Concat KDF and AES Key Wrap w/ 256-bit key"},
{-30, "ECDH-ES + A192KW", "ECDH ES w/ Concat KDF and AES Key Wrap w/ 192-bit key"},
{-29, "ECDH-ES + A128KW", "ECDH ES w/ Concat KDF and AES Key Wrap w/ 128-bit key"},
{-28, "ECDH-SS + HKDF-512", "ECDH SS w/ HKDF - generate key directly"},
{-27, "ECDH-SS + HKDF-256", "ECDH SS w/ HKDF - generate key directly"},
{-26, "ECDH-ES + HKDF-512", "ECDH ES w/ HKDF - generate key directly"},
{-25, "ECDH-ES + HKDF-256", "ECDH ES w/ HKDF - generate key directly"},
{-13, "direct+HKDF-AES-256", "Shared secret w/ AES-MAC 256-bit key"},
{-12, "direct+HKDF-AES-128", "Shared secret w/ AES-MAC 128-bit key"},
{-11, "direct+HKDF-SHA-512", "Shared secret w/ HKDF and SHA-512"},
{-10, "direct+HKDF-SHA-256", "Shared secret w/ HKDF and SHA-256"},
{-8, "EdDSA", "EdDSA"},
{-7, "ES256", "ECDSA w/ SHA-256"},
{-6, "direct", "Direct use of CEK"},
{-5, "A256KW", "AES Key Wrap w/ 256-bit key"},
{-4, "A192KW", "AES Key Wrap w/ 192-bit key"},
{-3, "A128KW", "AES Key Wrap w/ 128-bit key"},
{0, "Reserved", "Reserved"},
{1, "A128GCM", "AES-GCM mode w/ 128-bit key, 128-bit tag"},
{2, "A192GCM", "AES-GCM mode w/ 192-bit key, 128-bit tag"},
{3, "A256GCM", "AES-GCM mode w/ 256-bit key, 128-bit tag"},
{4, "HMAC 256/64", "HMAC w/ SHA-256 truncated to 64 bits"},
{5, "HMAC 256/256", "HMAC w/ SHA-256"},
{6, "HMAC 384/384", "HMAC w/ SHA-384"},
{7, "HMAC 512/512", "HMAC w/ SHA-512"},
{10, "AES-CCM-16-64-128", "AES-CCM mode 128-bit key, 64-bit tag, 13-byte nonce"},
{11, "AES-CCM-16-64-256", "AES-CCM mode 256-bit key, 64-bit tag, 13-byte nonce"},
{12, "AES-CCM-64-64-128", "AES-CCM mode 128-bit key, 64-bit tag, 7-byte nonce"},
{13, "AES-CCM-64-64-256", "AES-CCM mode 256-bit key, 64-bit tag, 7-byte nonce"},
{14, "AES-MAC 128/64", "AES-MAC 128-bit key, 64-bit tag"},
{15, "AES-MAC 256/64", "AES-MAC 256-bit key, 64-bit tag"},
{24, "ChaCha20/Poly1305", "ChaCha20/Poly1305 w/ 256-bit key, 128-bit tag"},
{25, "AES-MAC 128/128", "AES-MAC 128-bit key, 128-bit tag"},
{26, "AES-MAC 256/128", "AES-MAC 256-bit key, 128-bit tag"},
{30, "AES-CCM-16-128-128", "AES-CCM mode 128-bit key, 128-bit tag, 13-byte nonce"},
{31, "AES-CCM-16-128-256", "AES-CCM mode 256-bit key, 128-bit tag, 13-byte nonce"},
{32, "AES-CCM-64-128-128", "AES-CCM mode 128-bit key, 128-bit tag, 7-byte nonce"},
{33, "AES-CCM-64-128-256", "AES-CCM mode 256-bit key, 128-bit tag, 7-byte nonce"}
};
COSEValueNameDesc_t *GetCOSEAlgElm(int id) {
for (int i = 0; i < ARRAYLEN(COSEAlg); i++)
if (COSEAlg[i].Value == id)
return &COSEAlg[i];
return NULL;
}
const char *GetCOSEAlgName(int id) {
COSEValueNameDesc_t *elm = GetCOSEAlgElm(id);
if (elm)
return elm->Name;
return COSEEmptyStr;
}
const char *GetCOSEAlgDescription(int id) {
COSEValueNameDesc_t *elm = GetCOSEAlgElm(id);
if (elm)
return elm->Description;
return COSEEmptyStr;
}
int COSEGetECDSAKey(uint8_t *data, size_t datalen, bool verbose, uint8_t *public_key) {
CborParser parser;
CborValue map;
int64_t i64;
size_t len;
if(verbose)
PrintAndLog("----------- CBOR decode ----------------");
// kty
int res = CborMapGetKeyById(&parser, &map, data, datalen, 1);
if(!res) {
cbor_value_get_int64(&map, &i64);
if(verbose)
PrintAndLog("kty [%lld] %s", (long long)i64, GetCOSEktyDescription(i64));
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if (i64 != 2)
PrintAndLog("ERROR: kty must be 2.");
}
// algorithm
res = CborMapGetKeyById(&parser, &map, data, datalen, 3);
if(!res) {
cbor_value_get_int64(&map, &i64);
if(verbose)
PrintAndLog("algorithm [%lld] %s", (long long)i64, GetCOSEAlgDescription(i64));
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if (i64 != -7)
PrintAndLog("ERROR: algorithm must be -7.");
}
// curve
res = CborMapGetKeyById(&parser, &map, data, datalen, -1);
if(!res) {
cbor_value_get_int64(&map, &i64);
if(verbose)
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PrintAndLog("curve [%lld] %s", (long long)i64, GetCOSECurveDescription(i64));
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if (i64 != 1)
PrintAndLog("ERROR: curve must be 1.");
}
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// plain key
public_key[0] = 0x04;
// x - coordinate
res = CborMapGetKeyById(&parser, &map, data, datalen, -2);
if(!res) {
res = CborGetBinStringValue(&map, &public_key[1], 32, &len);
cbor_check(res);
if(verbose)
PrintAndLog("x - coordinate [%d]: %s", len, sprint_hex(&public_key[1], 32));
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if (len != 32)
PrintAndLog("ERROR: x - coordinate length must be 32.");
}
// y - coordinate
res = CborMapGetKeyById(&parser, &map, data, datalen, -3);
if(!res) {
res = CborGetBinStringValue(&map, &public_key[33], 32, &len);
cbor_check(res);
if(verbose)
PrintAndLog("y - coordinate [%d]: %s", len, sprint_hex(&public_key[33], 32));
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if (len != 32)
PrintAndLog("ERROR: y - coordinate length must be 32.");
}
// d - private key
uint8_t private_key[128] = {0};
res = CborMapGetKeyById(&parser, &map, data, datalen, -4);
if(!res) {
res = CborGetBinStringValue(&map, private_key, sizeof(private_key), &len);
cbor_check(res);
if(verbose)
PrintAndLog("d - private key [%d]: %s", len, sprint_hex(private_key, len));
}
if(verbose)
PrintAndLog("----------- CBOR decode ----------------");
return 0;
}
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