rust-cryptoki/cryptoki/src/session/encryption.rs at 02deaf7feeab7e4e9734d5c5907e3f2a8de342d5 · wiktor-k/rust-cryptoki · GitHub

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
// Copyright 2021 Contributors to the Parsec project.
// SPDX-License-Identifier: Apache-2.0
//! Encrypting data

use crate::context::Function;
use crate::error::{Result, Rv};
use crate::mechanism::Mechanism;
use crate::object::ObjectHandle;
use crate::session::Session;
use cryptoki_sys::*;
use std::convert::TryInto;

impl Session<'_> {
    /// Single-part encryption operation
    pub fn encrypt(
        &self,
        mechanism: &Mechanism,
        key: ObjectHandle,
        data: &[u8],
    ) -> Result<Vec<u8>> {
        let mut mechanism: CK_MECHANISM = mechanism.into();
        let mut encrypted_data_len = 0;

        unsafe {
            Rv::from(get_pkcs11!(self.client(), C_EncryptInit)(
                self.handle(),
                &mut mechanism as CK_MECHANISM_PTR,
                key.handle(),
            ))
            .into_result(Function::EncryptInit)?;
        }

        // Get the output buffer length
        unsafe {
            Rv::from(get_pkcs11!(self.client(), C_Encrypt)(
                self.handle(),
                data.as_ptr() as *mut u8,
                data.len().try_into()?,
                std::ptr::null_mut(),
                &mut encrypted_data_len,
            ))
            .into_result(Function::Encrypt)?;
        }

        let mut encrypted_data = vec![0; encrypted_data_len.try_into()?];

        unsafe {
            Rv::from(get_pkcs11!(self.client(), C_Encrypt)(
                self.handle(),
                data.as_ptr() as *mut u8,
                data.len().try_into()?,
                encrypted_data.as_mut_ptr(),
                &mut encrypted_data_len,
            ))
            .into_result(Function::Encrypt)?;
        }

        encrypted_data.truncate(encrypted_data_len.try_into()?);

        Ok(encrypted_data)
    }

    /// Starts new multi-part encryption operation
    pub fn encrypt_init(&self, mechanism: &Mechanism, key: ObjectHandle) -> Result<()> {
        let mut mechanism: CK_MECHANISM = mechanism.into();

        unsafe {
            Rv::from(get_pkcs11!(self.client(), C_EncryptInit)(
                self.handle(),
                &mut mechanism as CK_MECHANISM_PTR,
                key.handle(),
            ))
            .into_result(Function::EncryptInit)?;
        }

        Ok(())
    }

    /// Continues an ongoing multi-part encryption operation,
    /// taking in the next part of the data and returning its encryption
    pub fn encrypt_update(&self, data: &[u8]) -> Result<Vec<u8>> {
        let mut encrypted_data_len = 0;

        // Get the output buffer length
        unsafe {
            Rv::from(get_pkcs11!(self.client(), C_EncryptUpdate)(
                self.handle(),
                data.as_ptr() as *mut u8,
                data.len().try_into()?,
                std::ptr::null_mut(),
                &mut encrypted_data_len,
            ))
            .into_result(Function::EncryptUpdate)?;
        }

        let mut encrypted_data = vec![0; encrypted_data_len.try_into()?];

        unsafe {
            Rv::from(get_pkcs11!(self.client(), C_EncryptUpdate)(
                self.handle(),
                data.as_ptr() as *mut u8,
                data.len().try_into()?,
                encrypted_data.as_mut_ptr(),
                &mut encrypted_data_len,
            ))
            .into_result(Function::EncryptUpdate)?;
        }

        Ok(encrypted_data)
    }

    /// Finalizes ongoing multi-part encryption operation,
    /// returning any remaining bytes in the encrypted data
    pub fn encrypt_final(&self) -> Result<Vec<u8>> {
        let mut encrypted_data_len = 0;

        // Get the output buffer length
        unsafe {
            Rv::from(get_pkcs11!(self.client(), C_EncryptFinal)(
                self.handle(),
                std::ptr::null_mut(),
                &mut encrypted_data_len,
            ))
            .into_result(Function::EncryptFinal)?;
        }

        let mut encrypted_data = vec![0; encrypted_data_len.try_into()?];

        unsafe {
            Rv::from(get_pkcs11!(self.client(), C_EncryptFinal)(
                self.handle(),
                encrypted_data.as_mut_ptr(),
                &mut encrypted_data_len,
            ))
            .into_result(Function::EncryptFinal)?;
        }

        encrypted_data.truncate(encrypted_data_len.try_into()?);

        Ok(encrypted_data)
    }
}