# pkcs7.rs - source
Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-0.10.33/src/pkcs7.rs`.
Keywords: rust, rustlang, rust-lang

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    use bitflags::bitflags;
    use foreign_types::{ForeignType, ForeignTypeRef};
    use libc::c_int;
    use std::mem;
    use std::ptr;

    use crate::bio::{MemBio, MemBioSlice};
    use crate::error::ErrorStack;
    use crate::pkey::{HasPrivate, PKeyRef};
    use crate::stack::{Stack, StackRef};
    use crate::symm::Cipher;
    use crate::x509::store::X509StoreRef;
    use crate::x509::{X509Ref, X509};
    use crate::{cvt, cvt_p};

    foreign_type_and_impl_send_sync! {
        type CType = ffi::PKCS7;
        fn drop = ffi::PKCS7_free;

        /// A PKCS#7 structure.
        ///
        /// Contains signed and/or encrypted data.
        pub struct Pkcs7;

        /// Reference to `Pkcs7`
        pub struct Pkcs7Ref;
    }

    bitflags! {
        pub struct Pkcs7Flags: c_int {
            const TEXT = ffi::PKCS7_TEXT;
            const NOCERTS = ffi::PKCS7_NOCERTS;
            const NOSIGS = ffi::PKCS7_NOSIGS;
            const NOCHAIN = ffi::PKCS7_NOCHAIN;
            const NOINTERN = ffi::PKCS7_NOINTERN;
            const NOVERIFY = ffi::PKCS7_NOVERIFY;
            const DETACHED = ffi::PKCS7_DETACHED;
            const BINARY = ffi::PKCS7_BINARY;
            const NOATTR = ffi::PKCS7_NOATTR;
            const NOSMIMECAP = ffi::PKCS7_NOSMIMECAP;
            const NOOLDMIMETYPE = ffi::PKCS7_NOOLDMIMETYPE;
            const CRLFEOL = ffi::PKCS7_CRLFEOL;
            const STREAM = ffi::PKCS7_STREAM;
            const NOCRL = ffi::PKCS7_NOCRL;
            const PARTIAL = ffi::PKCS7_PARTIAL;
            const REUSE_DIGEST = ffi::PKCS7_REUSE_DIGEST;
            #[cfg(not(any(ossl101, ossl102, libressl)))]
            const NO_DUAL_CONTENT = ffi::PKCS7_NO_DUAL_CONTENT;
        }
    }

    impl Pkcs7 {
        from_pem! {
            /// Deserializes a PEM-encoded PKCS#7 signature
            ///
            /// The input should have a header of `-----BEGIN PKCS7-----`.
            ///
            /// This corresponds to [`PEM_read_bio_PKCS7`].
            ///
            /// [`PEM_read_bio_PKCS7`]: https://www.openssl.org/docs/man1.0.2/crypto/PEM_read_bio_PKCS7.html
            from_pem,
            Pkcs7,
            ffi::PEM_read_bio_PKCS7
        }

        from_der! {
            /// Deserializes a DER-encoded PKCS#7 signature
            ///
            /// This corresponds to [`d2i_PKCS7`].
            ///
            /// [`d2i_PKCS7`]: https://www.openssl.org/docs/man1.1.0/man3/d2i_PKCS7.html
            from_der,
            Pkcs7,
            ffi::d2i_PKCS7
        }

        /// Parses a message in S/MIME format.
        ///
        /// Returns the loaded signature, along with the cleartext message (if
        /// available).
        ///
        /// This corresponds to [`SMIME_read_PKCS7`].
        ///
        /// [`SMIME_read_PKCS7`]: https://www.openssl.org/docs/man1.1.0/crypto/SMIME_read_PKCS7.html
        pub fn from_smime(input: &[u8]) -> Result<(Pkcs7, Option<Vec<u8>>), ErrorStack> {
            ffi::init();

            let input_bio = MemBioSlice::new(input)?;
            let mut bcont_bio = ptr::null_mut();
            unsafe {
                let pkcs7 =
                    cvt_p(ffi::SMIME_read_PKCS7(input_bio.as_ptr(), &mut bcont_bio)).map(Pkcs7)?;
                let out = if !bcont_bio.is_null() {
                    let bcont_bio = MemBio::from_ptr(bcont_bio);
                    Some(bcont_bio.get_buf().to_vec())
                } else {
                    None
                };
                Ok((pkcs7, out))
            }
        }

        /// Creates and returns a PKCS#7 `envelopedData` structure.
        ///
        /// `certs` is a list of recipient certificates. `input` is the content to be
        /// encrypted. `cipher` is the symmetric cipher to use. `flags` is an optional
        /// set of flags.
        ///
        /// This corresponds to [`PKCS7_encrypt`].
        ///
        /// [`PKCS7_encrypt`]: https://www.openssl.org/docs/man1.0.2/crypto/PKCS7_encrypt.html
        pub fn encrypt(
            certs: &StackRef<X509>,
            input: &[u8],
            cipher: Cipher,
            flags: Pkcs7Flags,
        ) -> Result<Pkcs7, ErrorStack> {
            let input_bio = MemBioSlice::new(input)?;

            unsafe {
                cvt_p(ffi::PKCS7_encrypt(
                    certs.as_ptr(),
                    input_bio.as_ptr(),
                    cipher.as_ptr(),
                    flags.bits,
                ))
                .map(Pkcs7)
            }
        }

        /// Creates and returns a PKCS#7 `signedData` structure.
        ///
        /// `signcert` is the certificate to sign with, `pkey` is the corresponding
        /// private key. `certs` is an optional additional set of certificates to
        /// include in the PKCS#7 structure (for example any intermediate CAs in the
        /// chain).
        ///
        /// This corresponds to [`PKCS7_sign`].
        ///
        /// [`PKCS7_sign`]: https://www.openssl.org/docs/man1.0.2/crypto/PKCS7_sign.html
        pub fn sign<PT>(
            signcert: &X509Ref,
            pkey: &PKeyRef<PT>,
            certs: &StackRef<X509>,
            input: &[u8],
            flags: Pkcs7Flags,
        ) -> Result<Pkcs7, ErrorStack>
        where
            PT: HasPrivate,
        {
            let input_bio = MemBioSlice::new(input)?;
            unsafe {
                cvt_p(ffi::PKCS7_sign(
                    signcert.as_ptr(),
                    pkey.as_ptr(),
                    certs.as_ptr(),
                    input_bio.as_ptr(),
                    flags.bits,
                ))
                .map(Pkcs7)
            }
        }
    }

    impl Pkcs7Ref {
        /// Converts PKCS#7 structure to S/MIME format
        ///
        /// This corresponds to [`SMIME_write_PKCS7`].
        ///
        /// [`SMIME_write_PKCS7`]: https://www.openssl.org/docs/man1.1.0/crypto/SMIME_write_PKCS7.html
        pub fn to_smime(&self, input: &[u8], flags: Pkcs7Flags) -> Result<Vec<u8>, ErrorStack> {
            let input_bio = MemBioSlice::new(input)?;
            let output = MemBio::new()?;
            unsafe {
                cvt(ffi::SMIME_write_PKCS7(
                    output.as_ptr(),
                    self.as_ptr(),
                    input_bio.as_ptr(),
                    flags.bits,
                ))
                .map(|_| output.get_buf().to_owned())
            }
        }

        to_pem! {
            /// Serializes the data into a PEM-encoded PKCS#7 structure.
            ///
            /// The output will have a header of `-----BEGIN PKCS7-----`.
            ///
            /// This corresponds to [`PEM_write_bio_PKCS7`].
            ///
            /// [`PEM_write_bio_PKCS7`]: https://www.openssl.org/docs/man1.0.2/crypto/PEM_write_bio_PKCS7.html
            to_pem,
            ffi::PEM_write_bio_PKCS7
        }

        to_der! {
            /// Serializes the data into a DER-encoded PKCS#7 structure.
            ///
            /// This corresponds to [`i2d_PKCS7`].
            ///
            /// [`i2d_PKCS7`]: https://www.openssl.org/docs/man1.1.0/man3/i2d_PKCS7.html
            to_der,
            ffi::i2d_PKCS7
        }

        /// Decrypts data using the provided private key.
        ///
        /// `pkey` is the recipient's private key, and `cert` is the recipient's
        /// certificate.
        ///
        /// Returns the decrypted message.
        ///
        /// This corresponds to [`PKCS7_decrypt`].
        ///
        /// [`PKCS7_decrypt`]: https://www.openssl.org/docs/man1.0.2/crypto/PKCS7_decrypt.html
        pub fn decrypt<PT>(
            &self,
            pkey: &PKeyRef<PT>,
            cert: &X509Ref,
            flags: Pkcs7Flags,
        ) -> Result<Vec<u8>, ErrorStack>
        where
            PT: HasPrivate,
        {
            let output = MemBio::new()?;

            unsafe {
                cvt(ffi::PKCS7_decrypt(
                    self.as_ptr(),
                    pkey.as_ptr(),
                    cert.as_ptr(),
                    output.as_ptr(),
                    flags.bits,
                ))
                .map(|_| output.get_buf().to_owned())
            }
        }

        /// Verifies the PKCS#7 `signedData` structure contained by `&self`.
        ///
        /// `certs` is a set of certificates in which to search for the signer's
        /// certificate. `store` is a trusted certificate store (used for chain
        /// verification). `indata` is the signed data if the content is not present
        /// in `&self`. The content is written to `out` if it is not `None`.
        ///
        /// This corresponds to [`PKCS7_verify`].
        ///
        /// [`PKCS7_verify`]: https://www.openssl.org/docs/man1.0.2/crypto/PKCS7_verify.html
        pub fn verify(
            &self,
            certs: &StackRef<X509>,
            store: &X509StoreRef,
            indata: Option<&[u8]>,
            out: Option<&mut Vec<u8>>,
            flags: Pkcs7Flags,
        ) -> Result<(), ErrorStack> {
            let out_bio = MemBio::new()?;

            let indata_bio = match indata {
                Some(data) => Some(MemBioSlice::new(data)?),
                None => None,
            };
            let indata_bio_ptr = indata_bio.as_ref().map_or(ptr::null_mut(), |p| p.as_ptr());

            unsafe {
                cvt(ffi::PKCS7_verify(
                    self.as_ptr(),
                    certs.as_ptr(),
                    store.as_ptr(),
                    indata_bio_ptr,
                    out_bio.as_ptr(),
                    flags.bits,
                ))
                .map(|_| ())?
            }

            if let Some(data) = out {
                data.clear();
                data.extend_from_slice(out_bio.get_buf());
            }

            Ok(())
        }

        /// Retrieve the signer's certificates from the PKCS#7 structure without verifying them.
        ///
        /// This corresponds to [`PKCS7_get0_signers`].
        ///
        /// [`PKCS7_get0_signers`]: https://www.openssl.org/docs/man1.0.2/crypto/PKCS7_verify.html
        pub fn signers(
            &self,
            certs: &StackRef<X509>,
            flags: Pkcs7Flags,
        ) -> Result<Stack<X509>, ErrorStack> {
            unsafe {
                let ptr = cvt_p(ffi::PKCS7_get0_signers(
                    self.as_ptr(),
                    certs.as_ptr(),
                    flags.bits,
                ))?;

                // The returned stack is owned by the caller, but the certs inside are not! Our stack interface can't deal
                // with that, so instead we just manually bump the refcount of the certs so that the whole stack is properly
                // owned.
                let stack = Stack::<X509>::from_ptr(ptr);
                for cert in &stack {
                    mem::forget(cert.to_owned());
                }

                Ok(stack)
            }
        }
    }

    #[cfg(test)]
    mod tests {
        use crate::hash::MessageDigest;
        use crate::pkcs7::{Pkcs7, Pkcs7Flags};
        use crate::pkey::PKey;
        use crate::stack::Stack;
        use crate::symm::Cipher;
        use crate::x509::store::X509StoreBuilder;
        use crate::x509::X509;

        #[test]
        fn encrypt_decrypt_test() {
            let cert = include_bytes!("../test/certs.pem");
            let cert = X509::from_pem(cert).unwrap();
            let mut certs = Stack::new().unwrap();
            certs.push(cert.clone()).unwrap();
            let message: String = String::from("foo");
            let cypher = Cipher::des_ede3_cbc();
            let flags = Pkcs7Flags::STREAM;
            let pkey = include_bytes!("../test/key.pem");
            let pkey = PKey::private_key_from_pem(pkey).unwrap();

            let pkcs7 =
                Pkcs7::encrypt(&certs, message.as_bytes(), cypher, flags).expect("should succeed");

            let encrypted = pkcs7
                .to_smime(message.as_bytes(), flags)
                .expect("should succeed");

            let (pkcs7_decoded, _) = Pkcs7::from_smime(encrypted.as_slice()).expect("should succeed");

            let decoded = pkcs7_decoded
                .decrypt(&pkey, &cert, Pkcs7Flags::empty())
                .expect("should succeed");

            assert_eq!(decoded, message.into_bytes());
        }

        #[test]
        fn sign_verify_test_detached() {
            let cert = include_bytes!("../test/cert.pem");
            let cert = X509::from_pem(cert).unwrap();
            let certs = Stack::new().unwrap();
            let message = "foo";
            let flags = Pkcs7Flags::STREAM | Pkcs7Flags::DETACHED;
            let pkey = include_bytes!("../test/key.pem");
            let pkey = PKey::private_key_from_pem(pkey).unwrap();
            let mut store_builder = X509StoreBuilder::new().expect("should succeed");

            let root_ca = include_bytes!("../test/root-ca.pem");
            let root_ca = X509::from_pem(root_ca).unwrap();
            store_builder.add_cert(root_ca).expect("should succeed");

            let store = store_builder.build();

            let pkcs7 =
                Pkcs7::sign(&cert, &pkey, &certs, message.as_bytes(), flags).expect("should succeed");

            let signed = pkcs7
                .to_smime(message.as_bytes(), flags)
                .expect("should succeed");
            println!("{:?}", String::from_utf8(signed.clone()).unwrap());
            let (pkcs7_decoded, content) =
                Pkcs7::from_smime(signed.as_slice()).expect("should succeed");

            let mut output = Vec::new();
            pkcs7_decoded
                .verify(
                    &certs,
                    &store,
                    Some(message.as_bytes()),
                    Some(&mut output),
                    flags,
                )
                .expect("should succeed");

            assert_eq!(output, message.as_bytes());
            assert_eq!(content.expect("should be non-empty"), message.as_bytes());
        }

        #[test]
        fn sign_verify_test_normal() {
            let cert = include_bytes!("../test/cert.pem");
            let cert = X509::from_pem(cert).unwrap();
            let certs = Stack::new().unwrap();
            let message = "foo";
            let flags = Pkcs7Flags::STREAM;
            let pkey = include_bytes!("../test/key.pem");
            let pkey = PKey::private_key_from_pem(pkey).unwrap();
            let mut store_builder = X509StoreBuilder::new().expect("should succeed");

            let root_ca = include_bytes!("../test/root-ca.pem");
            let root_ca = X509::from_pem(root_ca).unwrap();
            store_builder.add_cert(root_ca).expect("should succeed");

            let store = store_builder.build();

            let pkcs7 =
                Pkcs7::sign(&cert, &pkey, &certs, message.as_bytes(), flags).expect("should succeed");

            let signed = pkcs7
                .to_smime(message.as_bytes(), flags)
                .expect("should succeed");

            let (pkcs7_decoded, content) =
                Pkcs7::from_smime(signed.as_slice()).expect("should succeed");

            let mut output = Vec::new();
            pkcs7_decoded
                .verify(&certs, &store, None, Some(&mut output), flags)
                .expect("should succeed");

            assert_eq!(output, message.as_bytes());
            assert!(content.is_none());
        }

        #[test]
        fn signers() {
            let cert = include_bytes!("../test/cert.pem");
            let cert = X509::from_pem(cert).unwrap();
            let cert_digest = cert.digest(MessageDigest::sha256()).unwrap();
            let certs = Stack::new().unwrap();
            let message = "foo";
            let flags = Pkcs7Flags::STREAM;
            let pkey = include_bytes!("../test/key.pem");
            let pkey = PKey::private_key_from_pem(pkey).unwrap();
            let mut store_builder = X509StoreBuilder::new().expect("should succeed");

            let root_ca = include_bytes!("../test/root-ca.pem");
            let root_ca = X509::from_pem(root_ca).unwrap();
            store_builder.add_cert(root_ca).expect("should succeed");

            let pkcs7 =
                Pkcs7::sign(&cert, &pkey, &certs, message.as_bytes(), flags).expect("should succeed");

            let signed = pkcs7
                .to_smime(message.as_bytes(), flags)
                .expect("should succeed");

            let (pkcs7_decoded, _) = Pkcs7::from_smime(signed.as_slice()).expect("should succeed");

            let empty_certs = Stack::new().unwrap();
            let signer_certs = pkcs7_decoded
                .signers(&empty_certs, flags)
                .expect("should succeed");
            assert_eq!(empty_certs.len(), 0);
            assert_eq!(signer_certs.len(), 1);
            let signer_digest = signer_certs[0].digest(MessageDigest::sha256()).unwrap();
            assert_eq!(*cert_digest, *signer_digest);
        }

        #[test]
        fn invalid_from_smime() {
            let input = String::from("Invalid SMIME Message");
            let result = Pkcs7::from_smime(input.as_bytes());

            assert_eq!(result.is_err(), true)
        }
    }