cfun 0.2.11

Tidy up common functions
Documentation 
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

#[cfg(feature = "crypto")]
use md5::{Digest, Md5};
#[cfg(feature = "crypto")]
use sha2::Sha256;

/// get md5 of data
#[cfg(feature = "crypto")]
pub fn md5(data: &Vec<u8>, upper: bool) -> String {
    let mut hasher = Md5::new();
    hasher.update(data);
    let result = hasher.finalize();
    if upper {
        format!("{:X}", result)
    } else {
        format!("{:x}", result)
    }
}

/// get sha256 of data
#[cfg(feature = "crypto")]
pub fn sha256(data: &Vec<u8>, upper: bool) -> String {
    let mut hasher = Sha256::new();
    hasher.update(data);
    let result = hasher.finalize();
    if upper {
        format!("{:X}", result)
    } else {
        format!("{:x}", result)
    }
}

/// get sha256 of data
#[cfg(feature = "crypto")]
pub fn sha512(data: &Vec<u8>, upper: bool) -> String {
    use sha2::Sha512;
    let mut hasher = Sha512::new();
    hasher.update(data);
    let result = hasher.finalize();
    if upper {
        format!("{:X}", result)
    } else {
        format!("{:x}", result)
    }
}

/// encode data with base64
#[cfg(feature = "crypto")]
pub fn base64_encode(data: &Vec<u8>) -> String {
    use base64::{prelude::BASE64_STANDARD, Engine};
    BASE64_STANDARD.encode(data)
}

/// decode data with base64
#[cfg(feature = "crypto")]
pub fn base64_decode(data: String) -> Result<Vec<u8>, base64::DecodeError> {
    use base64::{prelude::BASE64_STANDARD, Engine};
    BASE64_STANDARD.decode(data)
}

#[cfg(feature = "crypto")]
pub fn rsa_generate(bits: Option<usize>) -> (String, String) {
    use rsa::{
        pkcs1::{EncodeRsaPrivateKey, EncodeRsaPublicKey},
        rand_core::OsRng,
        RsaPrivateKey, RsaPublicKey,
    };

    let bits = bits.unwrap_or(2048);
    let priv_key = RsaPrivateKey::new(&mut OsRng, bits).expect("failed to generate a key");
    let pub_key = RsaPublicKey::from(&priv_key);
    let priv_key = priv_key
        .to_pkcs1_pem(rsa::pkcs8::LineEnding::CR)
        .unwrap()
        .to_string();
    let pub_key = pub_key.to_pkcs1_pem(rsa::pkcs8::LineEnding::CR).unwrap();
    (pub_key, priv_key)
}

#[cfg(feature = "crypto")]
pub fn rsa_pkcs1_pem_encrypt(pub_key: &str, msg: &Vec<u8>) -> Vec<u8> {
    use rsa::{pkcs1::DecodeRsaPublicKey, rand_core::OsRng, Pkcs1v15Encrypt, RsaPublicKey};
    let pubkey = RsaPublicKey::from_pkcs1_pem(&pub_key).unwrap();
    let mut rng = OsRng;
    let ciphertext = pubkey.encrypt(&mut rng, Pkcs1v15Encrypt, msg).unwrap();
    ciphertext
}

#[cfg(feature = "crypto")]
pub fn rsa_pkcs1_pem_decrypt(priv_key: &str, ciphertext: Vec<u8>) -> Vec<u8> {
    use rsa::{pkcs1::DecodeRsaPrivateKey, Pkcs1v15Encrypt, RsaPrivateKey};
    let privkey = RsaPrivateKey::from_pkcs1_pem(&priv_key).unwrap();
    let data = privkey.decrypt(Pkcs1v15Encrypt, &ciphertext).unwrap();
    data
}

#[cfg(feature = "crypto")]
pub fn rsa_encrypt_pem(pub_pem: &str, cnt: Vec<u8>) -> Result<Vec<u8>, anyhow::Error> {
    use rsa::{pkcs8::DecodePublicKey, rand_core::OsRng, Pkcs1v15Encrypt, RsaPublicKey};
    let pubkey = RsaPublicKey::from_public_key_pem(&pub_pem)?;
    let mut rng = OsRng;
    let ciphertext = pubkey.encrypt(&mut rng, Pkcs1v15Encrypt, &cnt)?;
    Ok(ciphertext)
}

#[cfg(feature = "crypto")]
pub fn rsa_encrypt_key(pub_key: &str, cnt: Vec<u8>) -> Result<Vec<u8>, anyhow::Error> {
    use rsa::{pkcs8::DecodePublicKey, rand_core::OsRng, Pkcs1v15Encrypt, RsaPublicKey};
    let pem_str = format!(
        "-----BEGIN PUBLIC KEY-----\n{}\n-----END PUBLIC KEY-----",
        wrap64(pub_key)
    );
    let pubkey = RsaPublicKey::from_public_key_pem(&pem_str)?;
    let mut rng = OsRng;
    let ciphertext = pubkey.encrypt(&mut rng, Pkcs1v15Encrypt, &cnt)?;
    Ok(ciphertext)
}

#[cfg(feature = "crypto")]
fn wrap64(s: &str) -> String {
    s.as_bytes()
        .chunks(64)
        .map(|chunk| std::str::from_utf8(chunk).unwrap())
        .collect::<Vec<_>>()
        .join("\n")
}

#[cfg(feature = "crypto")]
pub fn encrypt_ecb(plaintext: &[u8]) -> (Vec<u8>, Vec<u8>) {
    use aes::{
        cipher::{block_padding::Pkcs7, BlockEncrypt, KeyInit},
        Aes256Enc,
    };
    use rand::{rngs::OsRng, TryRngCore};
    let mut key = [0u8; 32];
    OsRng.try_fill_bytes(&mut key).unwrap();
    let aes = Aes256Enc::new_from_slice(&key).unwrap();
    let mut block = Vec::new();
    block.resize(plaintext.len() + 16, 0);
    let ret = aes
        .encrypt_padded_b2b::<Pkcs7>(plaintext, &mut block)
        .unwrap();
    (key.to_vec(), ret.to_vec())
}

#[cfg(feature = "crypto")]
pub fn decrypt_ecb(key: &[u8], ciphertext: &[u8]) -> Vec<u8> {
    use aes::{
        cipher::{block_padding::Pkcs7, BlockDecrypt, KeyInit},
        Aes256Dec,
    };

    let cipher = Aes256Dec::new_from_slice(key).unwrap();
    let mut block = Vec::new();
    block.resize(ciphertext.len(), 0);
    let data = cipher
        .decrypt_padded_b2b::<Pkcs7>(ciphertext, &mut block)
        .unwrap();
    data.to_vec()
}

#[cfg(feature = "crypto")]
pub fn encrypt_gcm(plaintext: &[u8], aad_opt: Option<&[u8]>) -> (Vec<u8>, Vec<u8>, Vec<u8>) {
    use aes_gcm::{
        aead::{Aead, OsRng, Payload},
        AeadCore, Aes256Gcm, KeyInit,
    };

    let key = Aes256Gcm::generate_key(OsRng);
    let aes = Aes256Gcm::new(&key);
    let nonce = Aes256Gcm::generate_nonce(&mut OsRng); // 96-bits; unique per message
    let payload = match aad_opt {
        Some(aad) => Payload {
            msg: plaintext,
            aad,
        },
        None => Payload {
            msg: plaintext,
            aad: &[],
        },
    };
    let cipher = aes.encrypt(&nonce, payload).unwrap(); // 4. 如果存在 AAD 就传入，若无则传空切片
    (key.to_vec(), cipher, nonce.to_vec())
}

#[cfg(feature = "crypto")]
pub fn decrypt_gcm(
    key: &Vec<u8>,
    cipher: &Vec<u8>,
    nonce: &Vec<u8>,
    aad_opt: Option<&[u8]>,
) -> Vec<u8> {
    use aes_gcm::{
        aead::{Aead, Payload},
        Aes256Gcm, Key, KeyInit, Nonce,
    };

    let key = Key::<Aes256Gcm>::from_slice(key);
    let nonce = Nonce::from_slice(nonce);
    let aes = Aes256Gcm::new(key);
    let payload = match aad_opt {
        Some(aad) => Payload { msg: &cipher, aad },
        None => Payload {
            msg: &cipher,
            aad: &[],
        },
    };
    let plaintext = aes.decrypt(nonce, payload).unwrap();
    plaintext
}

#[test]
#[cfg(feature = "crypto")]
fn test_md5() {
    let data = b"hello world";
    assert_eq!(
        md5(&data.to_vec(), false),
        "5eb63bbbe01eeed093cb22bb8f5acdc3"
    );
}

#[test]
#[cfg(feature = "crypto")]
fn c_crypto_test_sha256() {
    let data = b"hello world";
    assert_eq!(
        sha256(&data.to_vec(), false),
        "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"
    );
}

#[test]
#[cfg(feature = "crypto")]
fn c_crypto_test_sha512() {
    let data = b"hello world";
    assert_eq!(
        sha512(&data.to_vec(), false),
        "309ecc489c12d6eb4cc40f50c902f2b4d0ed77ee511a7c7a9bcd3ca86d4cd86f989dd35bc5ff499670da34255b45b0cfd830e81f605dcf7dc5542e93ae9cd76f"
    );
}

#[test]
#[cfg(feature = "crypto")]
fn test_base64_encode() {
    let data = b"hello world";
    assert_eq!(base64_encode(&data.to_vec()), "aGVsbG8gd29ybGQ=");
}

#[test]
#[cfg(feature = "crypto")]
fn test_base64_decode() {
    let data = "aGVsbG8gd29ybGQ=";
    assert_eq!(base64_decode(data.to_string()).unwrap(), b"hello world");
}