pkcs1/private_key/
other_prime_info.rs

1//! PKCS#1 OtherPrimeInfo support.
2
3use der::{asn1::UIntRef, DecodeValue, Encode, Header, Reader, Sequence};
4
5/// PKCS#1 OtherPrimeInfo as defined in [RFC 8017 Appendix 1.2].
6///
7/// ASN.1 structure containing an additional prime in a multi-prime RSA key.
8///
9/// ```text
10/// OtherPrimeInfo ::= SEQUENCE {
11///     prime             INTEGER,  -- ri
12///     exponent          INTEGER,  -- di
13///     coefficient       INTEGER   -- ti
14/// }
15/// ```
16///
17/// [RFC 8017 Appendix 1.2]: https://datatracker.ietf.org/doc/html/rfc8017#appendix-A.1.2
18#[derive(Clone)]
19#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
20pub struct OtherPrimeInfo<'a> {
21    /// Prime factor `r_i` of `n`, where `i` >= 3.
22    pub prime: UIntRef<'a>,
23
24    /// Exponent: `d_i = d mod (r_i - 1)`.
25    pub exponent: UIntRef<'a>,
26
27    /// CRT coefficient: `t_i = (r_1 * r_2 * ... * r_(i-1))^(-1) mod r_i`.
28    pub coefficient: UIntRef<'a>,
29}
30
31impl<'a> DecodeValue<'a> for OtherPrimeInfo<'a> {
32    fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> der::Result<Self> {
33        reader.read_nested(header.length, |reader| {
34            Ok(Self {
35                prime: reader.decode()?,
36                exponent: reader.decode()?,
37                coefficient: reader.decode()?,
38            })
39        })
40    }
41}
42
43impl<'a> Sequence<'a> for OtherPrimeInfo<'a> {
44    fn fields<F, T>(&self, f: F) -> der::Result<T>
45    where
46        F: FnOnce(&[&dyn Encode]) -> der::Result<T>,
47    {
48        f(&[&self.prime, &self.exponent, &self.coefficient])
49    }
50}
pkcs1/private_key/other_prime_info.rs

pkcs1/private_key/
other_prime_info.rs
