1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
#![allow(missing_docs)]
///! This crate contains types only for working JWK and JWK Sets
///! This is only meant to be used to deal with public JWK, not generate ones.
///! Most of the code in this file is taken from https://github.com/lawliet89/biscuit but
/// tweaked to remove the private bits as it's not the goal for this crate currently.
///!
use crate::Algorithm;
use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
use std::fmt;

/// The intended usage of the public `KeyType`. This enum is serialized `untagged`
#[derive(Clone, Debug, Eq, PartialEq, Hash)]
pub enum PublicKeyUse {
    /// Indicates a public key is meant for signature verification
    Signature,
    /// Indicates a public key is meant for encryption
    Encryption,
    /// Other usage
    Other(String),
}

impl Serialize for PublicKeyUse {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let string = match *self {
            PublicKeyUse::Signature => "sig",
            PublicKeyUse::Encryption => "enc",
            PublicKeyUse::Other(ref other) => other,
        };

        serializer.serialize_str(string)
    }
}

impl<'de> Deserialize<'de> for PublicKeyUse {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct PublicKeyUseVisitor;
        impl<'de> de::Visitor<'de> for PublicKeyUseVisitor {
            type Value = PublicKeyUse;

            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
                write!(formatter, "a string")
            }

            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
            where
                E: de::Error,
            {
                Ok(match v {
                    "sig" => PublicKeyUse::Signature,
                    "enc" => PublicKeyUse::Encryption,
                    other => PublicKeyUse::Other(other.to_string()),
                })
            }
        }

        deserializer.deserialize_string(PublicKeyUseVisitor)
    }
}

/// Operations that the key is intended to be used for. This enum is serialized `untagged`
#[derive(Clone, Debug, Eq, PartialEq, Hash)]
pub enum KeyOperations {
    /// Computer digital signature or MAC
    Sign,
    /// Verify digital signature or MAC
    Verify,
    /// Encrypt content
    Encrypt,
    /// Decrypt content and validate decryption, if applicable
    Decrypt,
    /// Encrypt key
    WrapKey,
    /// Decrypt key and validate decryption, if applicable
    UnwrapKey,
    /// Derive key
    DeriveKey,
    /// Derive bits not to be used as a key
    DeriveBits,
    /// Other operation
    Other(String),
}

impl Serialize for KeyOperations {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let string = match *self {
            KeyOperations::Sign => "sign",
            KeyOperations::Verify => "verify",
            KeyOperations::Encrypt => "encrypt",
            KeyOperations::Decrypt => "decrypt",
            KeyOperations::WrapKey => "wrapKey",
            KeyOperations::UnwrapKey => "unwrapKey",
            KeyOperations::DeriveKey => "deriveKey",
            KeyOperations::DeriveBits => "deriveBits",
            KeyOperations::Other(ref other) => other,
        };

        serializer.serialize_str(string)
    }
}

impl<'de> Deserialize<'de> for KeyOperations {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct KeyOperationsVisitor;
        impl<'de> de::Visitor<'de> for KeyOperationsVisitor {
            type Value = KeyOperations;

            fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
                write!(formatter, "a string")
            }

            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
            where
                E: de::Error,
            {
                Ok(match v {
                    "sign" => KeyOperations::Sign,
                    "verify" => KeyOperations::Verify,
                    "encrypt" => KeyOperations::Encrypt,
                    "decrypt" => KeyOperations::Decrypt,
                    "wrapKey" => KeyOperations::WrapKey,
                    "unwrapKey" => KeyOperations::UnwrapKey,
                    "deriveKey" => KeyOperations::DeriveKey,
                    "deriveBits" => KeyOperations::DeriveBits,
                    other => KeyOperations::Other(other.to_string()),
                })
            }
        }

        deserializer.deserialize_string(KeyOperationsVisitor)
    }
}

/// Common JWK parameters
#[derive(Debug, Clone, Eq, PartialEq, Serialize, Deserialize, Default, Hash)]
pub struct CommonParameters {
    /// The intended use of the public key. Should not be specified with `key_operations`.
    /// See sections 4.2 and 4.3 of [RFC7517](https://tools.ietf.org/html/rfc7517).
    #[serde(rename = "use", skip_serializing_if = "Option::is_none", default)]
    pub public_key_use: Option<PublicKeyUse>,

    /// The "key_ops" (key operations) parameter identifies the operation(s)
    /// for which the key is intended to be used.  The "key_ops" parameter is
    /// intended for use cases in which public, private, or symmetric keys
    /// may be present.
    /// Should not be specified with `public_key_use`.
    /// See sections 4.2 and 4.3 of [RFC7517](https://tools.ietf.org/html/rfc7517).
    #[serde(rename = "key_ops", skip_serializing_if = "Option::is_none", default)]
    pub key_operations: Option<Vec<KeyOperations>>,

    /// The algorithm intended for use with the key
    #[serde(rename = "alg", skip_serializing_if = "Option::is_none", default)]
    pub algorithm: Option<Algorithm>,

    /// The case sensitive Key ID for the key
    #[serde(rename = "kid", skip_serializing_if = "Option::is_none", default)]
    pub key_id: Option<String>,

    /// X.509 Public key cerfificate URL. This is currently not implemented (correctly).
    ///
    /// Serialized to `x5u`.
    #[serde(rename = "x5u", skip_serializing_if = "Option::is_none")]
    pub x509_url: Option<String>,

    /// X.509 public key certificate chain. This is currently not implemented (correctly).
    ///
    /// Serialized to `x5c`.
    #[serde(rename = "x5c", skip_serializing_if = "Option::is_none")]
    pub x509_chain: Option<Vec<String>>,

    /// X.509 Certificate SHA1 thumbprint. This is currently not implemented (correctly).
    ///
    /// Serialized to `x5t`.
    #[serde(rename = "x5t", skip_serializing_if = "Option::is_none")]
    pub x509_sha1_fingerprint: Option<String>,

    /// X.509 Certificate SHA256 thumbprint. This is currently not implemented (correctly).
    ///
    /// Serialized to `x5t#S256`.
    #[serde(rename = "x5t#S256", skip_serializing_if = "Option::is_none")]
    pub x509_sha256_fingerprint: Option<String>,
}

/// Key type value for an Elliptic Curve Key.
/// This single value enum is a workaround for Rust not supporting associated constants.
#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
pub enum EllipticCurveKeyType {
    /// Key type value for an Elliptic Curve Key.
    EC,
}

impl Default for EllipticCurveKeyType {
    fn default() -> Self {
        EllipticCurveKeyType::EC
    }
}

/// Type of cryptographic curve used by a key. This is defined in
/// [RFC 7518 #7.6](https://tools.ietf.org/html/rfc7518#section-7.6)
#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
pub enum EllipticCurve {
    /// P-256 curve
    #[serde(rename = "P-256")]
    P256,
    /// P-384 curve
    #[serde(rename = "P-384")]
    P384,
    /// P-521 curve -- unsupported by `ring`.
    #[serde(rename = "P-521")]
    P521,
}

impl Default for EllipticCurve {
    fn default() -> Self {
        EllipticCurve::P256
    }
}

/// Parameters for an Elliptic Curve Key
#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Default, Hash)]
pub struct EllipticCurveKeyParameters {
    /// Key type value for an Elliptic Curve Key.
    #[serde(rename = "kty")]
    pub key_type: EllipticCurveKeyType,
    /// The "crv" (curve) parameter identifies the cryptographic curve used
    /// with the key.
    #[serde(rename = "crv")]
    pub curve: EllipticCurve,
    /// The "x" (x coordinate) parameter contains the x coordinate for the
    /// Elliptic Curve point.
    pub x: String,
    /// The "y" (y coordinate) parameter contains the y coordinate for the
    /// Elliptic Curve point.
    pub y: String,
}

/// Key type value for an RSA Key.
/// This single value enum is a workaround for Rust not supporting associated constants.
#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
pub enum RSAKeyType {
    /// Key type value for an RSA Key.
    RSA,
}

impl Default for RSAKeyType {
    fn default() -> Self {
        RSAKeyType::RSA
    }
}

/// Parameters for a RSA Key
#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Default, Hash)]
pub struct RSAKeyParameters {
    /// Key type value for a RSA Key
    #[serde(rename = "kty")]
    pub key_type: RSAKeyType,

    /// The "n" (modulus) parameter contains the modulus value for the RSA
    /// public key.
    pub n: String,

    /// The "e" (exponent) parameter contains the exponent value for the RSA
    /// public key.
    pub e: String,
}

/// Key type value for an Octet symmetric key.
/// This single value enum is a workaround for Rust not supporting associated constants.
#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
pub enum OctetKeyType {
    /// Key type value for an Octet symmetric key.
    #[serde(rename = "oct")]
    Octet,
}

impl Default for OctetKeyType {
    fn default() -> Self {
        OctetKeyType::Octet
    }
}

/// Parameters for an Octet Key
#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Default, Hash)]
pub struct OctetKeyParameters {
    /// Key type value for an Octet Key
    #[serde(rename = "kty")]
    pub key_type: OctetKeyType,
    /// The octet key value
    pub value: String,
}

/// Key type value for an Octet Key Pair.
/// This single value enum is a workaround for Rust not supporting associated constants.
#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
pub enum OctetKeyPairType {
    /// Key type value for an Octet Key Pair.
    #[serde(rename = "OKP")]
    OctetKeyPair,
}

impl Default for OctetKeyPairType {
    fn default() -> Self {
        OctetKeyPairType::OctetKeyPair
    }
}

/// Parameters for an Octet Key Pair
#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Default, Hash)]
pub struct OctetKeyPairParameters {
    /// Key type value for an Octet Key Pair
    #[serde(rename = "kty")]
    pub key_type: OctetKeyPairType,
    /// The "crv" (curve) parameter identifies the cryptographic curve used
    /// with the key.
    #[serde(rename = "crv")]
    pub curve: EllipticCurve,
    /// The "x" parameter contains the base64 encoded public key
    pub x: String,
}

/// Algorithm specific parameters
#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
#[serde(untagged)]
pub enum AlgorithmParameters {
    EllipticCurve(EllipticCurveKeyParameters),
    RSA(RSAKeyParameters),
    OctetKey(OctetKeyParameters),
    OctetKeyPair(OctetKeyPairParameters),
}

#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
pub struct Jwk {
    #[serde(flatten)]
    pub common: CommonParameters,
    /// Key algorithm specific parameters
    #[serde(flatten)]
    pub algorithm: AlgorithmParameters,
}

/// A JWK set
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct JwkSet {
    pub keys: Vec<Jwk>,
}

impl JwkSet {
    /// Find the key in the set that matches the given key id, if any.
    pub fn find(&self, kid: &str) -> Option<&Jwk> {
        self.keys
            .iter()
            .find(|jwk| jwk.common.key_id.is_some() && jwk.common.key_id.as_ref().unwrap() == kid)
    }
}