115 lines
4 KiB
Rust
115 lines
4 KiB
Rust
//! ```ignore
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//! // Private-key information shall have ASN.1 type PrivateKeyInfo
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//! PrivateKeyInfo ::= SEQUENCE {
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//! version Version,
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//! privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
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//! privateKey PrivateKey,
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//! attributes [0] IMPLICIT Attributes OPTIONAL
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//! }
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//!
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//! // version is the syntax version number, for compatibility with future revisions of the spec.
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//! // It shall be 0 for this version.
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//! Version ::= INTEGER
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//!
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//! // privateKeyAlgorithm identifies the private-key algorithm. One example of a private-key
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//! // algorithm is PKCS #1's rsaEncryption [PKCS#1]
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//! //
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//! // A type that identifies an algorithm (by object identifier) and any associated parameters.
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//! // This type is defined in [X.509](https://tools.ietf.org/html/rfc5208#ref-X.509)
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//! PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
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//!
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//! // privateKey is an octet string whose contents are the value of the private key. The
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//! // interpretation of the contents is defined in the registration of the private-key algorithm.
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//! // For an RSA private key, for example, the ocntents are a BER encodeing of a value of type
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//! // RSAPrivateKey.
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//! PrivateKey ::= OCTET STRING
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//!
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//! // attributes is a set of attributes. These are the extended information that is encrypted
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//! // along with the private-key information.
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//! Attributes ::= SET OF Attribute
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//! ```
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use super::*;
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use num_bigint_dig::{traits::ModInverse, BigUint};
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use num_traits::identities::One;
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use rsa::{PublicKeyParts, RSAPrivateKey};
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use std::convert::TryInto;
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impl KeyExt for RSAPrivateKey {
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fn to_pem_pkcs8(&self) -> Result<String, KeyError> {
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let bytes = write_pkcs1(self).ok_or(KeyError::Serialize)?;
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let oid = yasna::models::ObjectIdentifier::from_slice(&RSA_OID);
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let contents = yasna::construct_der(|writer| {
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writer.write_sequence(|writer| {
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writer.next().write_i64(0); // version is 0
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writer.next().write_sequence(|writer| {
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writer.next().write_oid(&oid);
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writer.next().write_null();
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});
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writer.next().write_bytes(&bytes);
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});
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});
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let p = pem::Pem {
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tag: "PRIVATE KEY".to_owned(),
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contents,
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};
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Ok(pem::encode(&p))
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}
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fn from_pem_pkcs8(pem: &str) -> Result<Self, KeyError> {
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let data = pem::parse(pem).map_err(|_| KeyError::Pem)?;
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if data.tag != "PRIVATE KEY" {
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return Err(KeyError::Kind);
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}
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data.try_into().map_err(KeyError::Parse)
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}
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fn to_pem_pkcs1(&self) -> Result<String, KeyError> {
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let contents = write_pkcs1(self).ok_or(KeyError::Serialize)?;
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let p = pem::Pem {
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tag: "RSA PRIVATE KEY".to_owned(),
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contents,
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};
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Ok(pem::encode(&p))
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}
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fn from_pem_pkcs1(pem: &str) -> Result<Self, KeyError> {
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let data = pem::parse(pem).map_err(|_| KeyError::Pem)?;
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if data.tag != "RSA PRIVATE KEY" {
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return Err(KeyError::Kind);
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}
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data.try_into().map_err(KeyError::Parse)
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}
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}
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fn write_pkcs1(rsa: &RSAPrivateKey) -> Option<Vec<u8>> {
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let exp1 = rsa.d() % (rsa.primes()[0].clone() - BigUint::one());
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let exp2 = rsa.d() % (rsa.primes()[1].clone() - BigUint::one());
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let coeff = rsa.primes()[0]
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.clone()
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.mod_inverse(rsa.primes()[1].clone())?;
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Some(yasna::construct_der(|writer| {
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writer.write_sequence(|writer| {
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writer.next().write_i64(0);
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writer.next().write_biguint(&from_dig(rsa.n()));
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writer.next().write_biguint(&from_dig(rsa.e()));
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writer.next().write_biguint(&from_dig(rsa.d()));
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writer.next().write_biguint(&from_dig(&rsa.primes()[0]));
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writer.next().write_biguint(&from_dig(&rsa.primes()[1]));
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writer.next().write_biguint(&from_dig(&exp1));
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writer.next().write_biguint(&from_dig(&exp2));
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writer.next().write_bigint(&int_from_dig(&coeff));
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})
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}))
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}
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