| //! Helper module for RSA key encoding / decoding. |
| |
| mod der; |
| |
| use untrusted::Input; |
| |
| use self::der::{Tag, Der}; |
| |
| /// Corresponds to `1.2.840.113549.1.1.1 rsaEncryption(PKCS #1)` |
| const RSA_PKCS1_OID: &'static [u8] = &[0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01]; |
| |
| pub fn convert_to_pkcs1<'a>(input: &[u8]) -> Vec<u8> { |
| // if we ever move away from `ring`, this needs to do an explicit key size check (>= 2048) |
| from_pkcs1(input) |
| .or_else(|| from_spki(input)) |
| .unwrap_or_else(|| input.to_vec()) |
| } |
| |
| fn from_pkcs1(input: &[u8]) -> Option<Vec<u8>> { |
| let _input = Input::from(&input); |
| _input.read_all(der::Error, |i| { |
| der::nested(i, Tag::Sequence, der::Error, |i| { |
| let _ = der::positive_integer(i)?; |
| let _ = der::positive_integer(i)?; |
| // if the input was already pkcs1, just return it |
| Ok(input.to_vec()) |
| }) |
| }) |
| .ok() |
| } |
| |
| fn from_spki(input: &[u8]) -> Option<Vec<u8>> { |
| let _input = Input::from(&input); |
| _input.read_all(der::Error, |i| { |
| der::nested(i, Tag::Sequence, der::Error, |i| { |
| der::nested(i, Tag::Sequence, der::Error, |i| { |
| let oid = der::expect_tag_and_get_value(i, Tag::OID)?; |
| if oid != Input::from(RSA_PKCS1_OID) { |
| return Err(der::Error); |
| } |
| |
| let _ = der::expect_tag_and_get_value(i, Tag::Null)?; |
| Ok(()) |
| })?; |
| |
| der::nested(i, Tag::BitString, der::Error, |i| { |
| // wtf why |
| let _ = der::expect_tag_and_get_value(i, Tag::EOC)?; |
| Ok(i.skip_to_end().iter().cloned().collect()) |
| //der::nested(i, Tag::Sequence, der::Error, |i| { |
| // let n = der::positive_integer(i)?; |
| // let e = der::positive_integer(i)?; |
| // write_pkcs1(n, e) |
| //}) |
| }) |
| }) |
| }) |
| .ok() |
| } |
| |
| #[allow(dead_code)] |
| fn write_pkcs1(n: Input, e: Input) -> Result<Vec<u8>, der::Error> { |
| let mut output = Vec::new(); |
| { |
| let mut _der = Der::new(&mut output); |
| _der.write_sequence(|_der| { |
| _der.write_integer(n)?; |
| _der.write_integer(e) |
| })?; |
| } |
| |
| Ok(output) |
| } |
| |
| |
| #[cfg(test)] |
| mod test { |
| use super::*; |
| use pem; |
| use std::fs::File; |
| use std::io::Read; |
| |
| fn read_file(path: &str) -> Vec<u8> { |
| let mut file = File::open(path).expect("couldn't open file"); |
| let mut buf = Vec::new(); |
| file.read_to_end(&mut buf).expect("couldn't read file"); |
| buf |
| } |
| |
| #[test] |
| fn test_write_pkcs1() { |
| let contents = read_file("./tests/rsa/pkcs1-1.pub"); |
| let contents = pem::parse(&contents).expect("not PEM").contents; |
| |
| let n = &[0x00, 0x9d, 0xda, 0x85, 0x17, 0x15, 0x67, 0xab, 0xb1, 0x63, 0x8a, 0x13, 0x01, |
| 0xee, 0xc0, 0x63, 0x7c, 0xc3, 0x08, 0x4b, 0x6d, 0x75, 0xd8, 0x70, 0x74, 0x3d, |
| 0xab, 0x98, 0xef, 0x00, 0xd0, 0xf2, 0x04, 0xe7, 0x7d, 0xb5, 0xa4, 0x08, 0xe3, |
| 0x90, 0xda, 0x4b, 0xe1, 0xd1, 0xff, 0x0f, 0x87, 0x8d, 0x6b, 0x43, 0x58, 0x99, |
| 0x88, 0xf6, 0x99, 0xab, 0xe7, 0x90, 0xfb, 0x2a, 0xa1, 0x3c, 0x2b, 0x0f, 0x24, |
| 0xa4, 0x9e, 0xab, 0xd1, 0xfc, 0xa0, 0xe0, 0xa8, 0x9f, 0x82, 0x48, 0xe5, 0xa7, |
| 0xd2, 0x4d, 0x44, 0xe4, 0x0b, 0x43, 0x66, 0x03, 0x54, 0x8d, 0xdd, 0xc3, 0x0c, |
| 0x26, 0xf5, 0x20, 0x36, 0xbf, 0xae, 0x05, 0x63, 0x9c, 0xf8, 0x81, 0xeb, 0xf7, |
| 0x4a, 0x3a, 0xc4, 0x14, 0xee, 0xce, 0x99, 0x66, 0x9f, 0x3c, 0xe3, 0x18, 0x21, |
| 0x8d, 0x68, 0xe3, 0x0b, 0xb7, 0xb3, 0xf7, 0xca, 0xe1, 0x7c, 0xab, 0xd5, 0x17, |
| 0x6f, 0x50, 0xc1, 0x38, 0x1b, 0xea, 0x62, 0xeb, 0x46, 0x07, 0x95, 0x01, 0xfb, |
| 0xd3, 0x1a, 0xd0, 0xae, 0x1c, 0xe6, 0x53, 0x27, 0x53, 0x2d, 0x08, 0x55, 0xbe, |
| 0xa3, 0xd6, 0xd1, 0x02, 0x14, 0xa4, 0xa2, 0xe1, 0x14, 0xde, 0xa4, 0x0e, 0x54, |
| 0x00, 0xe5, 0x79, 0x2c, 0x4d, 0x93, 0xe8, 0x6b, 0x3c, 0xf6, 0x44, 0x63, 0x85, |
| 0x3c, 0x6f, 0x56, 0xc2, 0x80, 0x02, 0x3f, 0x76, 0xcf, 0x75, 0x46, 0x5f, 0x9a, |
| 0x49, 0x47, 0xdc, 0xe6, 0xe9, 0x9a, 0xc0, 0x6e, 0x34, 0x9e, 0x9f, 0xd2, 0xdf, |
| 0xbc, 0x55, 0xa0, 0x77, 0x61, 0xf3, 0xd5, 0x0c, 0xb8, 0x77, 0xd2, 0x66, 0xd2, |
| 0x24, 0x9a, 0x25, 0xbe, 0x55, 0x1b, 0x4e, 0xbf, 0x3b, 0x82, 0x4c, 0x4f, 0x51, |
| 0x57, 0x7c, 0x8b, 0xf6, 0x38, 0xfe, 0x4d, 0x97, 0x32, 0xa8, 0xc8, 0x3c, 0x69, |
| 0xe5, 0x91, 0x15, 0x2c, 0x75, 0x8d, 0x92, 0xc1, 0xc7, 0x6b]; |
| |
| let e = &[0x01, 0x00, 0x01]; |
| let bytes = write_pkcs1(Input::from(n), Input::from(e)); |
| |
| assert_eq!(bytes, Ok(contents)); |
| } |
| |
| #[test] |
| fn pkcs1_noop_conversion_1() { |
| let contents = read_file("./tests/rsa/pkcs1-1.pub"); |
| let contents = pem::parse(&contents).expect("not PEM").contents; |
| assert_eq!(convert_to_pkcs1(&contents), contents); |
| } |
| |
| #[test] |
| fn pkcs1_noop_conversion_2() { |
| let contents = read_file("./tests/rsa/pkcs1-2.pub"); |
| let contents = pem::parse(&contents).expect("not PEM").contents; |
| assert_eq!(convert_to_pkcs1(&contents), contents); |
| } |
| |
| #[test] |
| fn pkcs1_from_spki_conversion_1() { |
| let spki = read_file("./tests/rsa/spki-1.pub"); |
| let spki = pem::parse(&spki).expect("not PEM").contents; |
| |
| let pkcs1 = read_file("./tests/rsa/pkcs1-1.pub"); |
| let pkcs1 = pem::parse(&pkcs1).expect("not PEM").contents; |
| |
| for (i, (a, b)) in convert_to_pkcs1(&spki).iter().zip(pkcs1.iter()).enumerate() { |
| println!("{} {} {}", i, a, b); |
| } |
| |
| assert!(convert_to_pkcs1(&spki) == pkcs1); |
| } |
| |
| #[test] |
| fn pkcs1_from_spki_conversion_2() { |
| let spki = read_file("./tests/rsa/spki-2.pub"); |
| let spki = pem::parse(&spki).expect("not PEM").contents; |
| |
| let pkcs1 = read_file("./tests/rsa/pkcs1-2.pub"); |
| let pkcs1 = pem::parse(&pkcs1).expect("not PEM").contents; |
| |
| for (i, (a, b)) in convert_to_pkcs1(&spki).iter().zip(pkcs1.iter()).enumerate() { |
| println!("{} {} {}", i, a, b); |
| } |
| |
| assert!(convert_to_pkcs1(&spki) == pkcs1); |
| } |
| } |