111 lines
4 KiB
Rust
111 lines
4 KiB
Rust
use rsa::pkcs8::{FromPrivateKey, FromPublicKey, ToPrivateKey, ToPublicKey};
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use rsa::{Hash, PaddingScheme, PublicKey, RsaPrivateKey, RsaPublicKey};
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use sha2::{Digest, Sha256};
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pub fn generate_rsa_key() -> Result<RsaPrivateKey, rsa::errors::Error> {
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let mut rng = rand::rngs::OsRng;
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let bits = 2048;
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RsaPrivateKey::new(&mut rng, bits)
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}
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#[cfg(feature = "test-utils")]
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pub fn generate_weak_rsa_key() -> Result<RsaPrivateKey, rsa::errors::Error> {
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use rand::SeedableRng;
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let mut rng = rand::rngs::SmallRng::seed_from_u64(0);
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let bits = 512;
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RsaPrivateKey::new(&mut rng, bits)
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}
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pub fn serialize_private_key(private_key: &RsaPrivateKey) -> Result<String, rsa::pkcs8::Error> {
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private_key.to_pkcs8_pem().map(|val| val.to_string())
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}
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pub fn deserialize_private_key(private_key_pem: &str) -> Result<RsaPrivateKey, rsa::pkcs8::Error> {
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RsaPrivateKey::from_pkcs8_pem(private_key_pem)
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}
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pub fn get_public_key_pem(private_key: &RsaPrivateKey) -> Result<String, rsa::pkcs8::Error> {
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let public_key = RsaPublicKey::from(private_key);
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public_key.to_public_key_pem()
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}
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pub fn deserialize_public_key(public_key_pem: &str) -> Result<RsaPublicKey, rsa::pkcs8::Error> {
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// rsa package can't decode PEM string with non-standard wrap width,
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// so the input should be normalized first
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let parsed_pem =
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pem::parse(public_key_pem.trim().as_bytes()).map_err(|_| rsa::pkcs8::Error::Pem)?;
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let normalized_pem = pem::encode(&parsed_pem);
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RsaPublicKey::from_public_key_pem(&normalized_pem)
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}
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/// RSASSA-PKCS1-v1_5 signature
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pub fn create_rsa_sha256_signature(
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private_key: &RsaPrivateKey,
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message: &str,
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) -> Result<Vec<u8>, rsa::errors::Error> {
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let digest = Sha256::digest(message.as_bytes());
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let padding = PaddingScheme::new_pkcs1v15_sign(Some(Hash::SHA2_256));
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let signature = private_key.sign(padding, &digest)?;
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Ok(signature)
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}
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/// RSASSA-PKCS1-v1_5 signature
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pub fn create_rsa_signature(
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private_key: &RsaPrivateKey,
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message: &str,
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) -> Result<Vec<u8>, rsa::errors::Error> {
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let digest = Sha256::digest(message.as_bytes());
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let padding = PaddingScheme::new_pkcs1v15_sign(Some(Hash::SHA2_256));
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let signature = private_key.sign(padding, &digest)?;
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Ok(signature)
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}
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pub fn get_message_digest(message: &str) -> String {
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let digest = Sha256::digest(message.as_bytes());
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let digest_b64 = base64::encode(digest);
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digest_b64
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}
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pub fn verify_rsa_sha256_signature(
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public_key: &RsaPublicKey,
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message: &str,
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signature: &[u8],
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) -> bool {
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let digest = Sha256::digest(message.as_bytes());
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let padding = PaddingScheme::new_pkcs1v15_sign(Some(Hash::SHA2_256));
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let is_valid = public_key.verify(padding, &digest, signature).is_ok();
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is_valid
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_deserialize_public_key_nowrap() {
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let public_key_pem = "-----BEGIN PUBLIC KEY-----\nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC8ehqQ7n6+pw19U8q2UtxE/9017STW3yRnnqV5nVk8LJ00ba+berqwekxDW+nw77GAu3TJ+hYeeSerUNPup7y3yO3V
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YsFtrgWDQ/s8k86sNBU+Ce2GOL7seh46kyAWgJeohh4Rcrr23rftHbvxOcRM8VzYuCeb1DgVhPGtA0xULwIDAQAB\n-----END PUBLIC KEY-----";
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let result = deserialize_public_key(&public_key_pem);
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assert_eq!(result.is_ok(), true);
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}
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#[test]
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fn test_public_key_serialization_deserialization() {
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let private_key = generate_weak_rsa_key().unwrap();
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let public_key_pem = get_public_key_pem(&private_key).unwrap();
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let public_key = deserialize_public_key(&public_key_pem).unwrap();
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assert_eq!(public_key, RsaPublicKey::from(&private_key));
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}
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#[test]
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fn test_verify_rsa_signature() {
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let private_key = generate_weak_rsa_key().unwrap();
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let message = "test".to_string();
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let signature = create_rsa_sha256_signature(&private_key, &message).unwrap();
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let public_key = RsaPublicKey::from(&private_key);
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let is_valid = verify_rsa_sha256_signature(&public_key, &message, &signature);
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assert_eq!(is_valid, true);
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}
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}
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