Cryptography and SSL/TLS Toolkit

Pem_read_bio_privatekey.

pem_password_cb, PEM_read_bio_PrivateKey, PEM_read_PrivateKey, PEM_write_bio_PrivateKey, PEM_write_bio_PrivateKey_traditional, PEM_write_PrivateKey, PEM_write_bio_PKCS8PrivateKey, PEM_write_PKCS8PrivateKey, PEM_write_bio_PKCS8PrivateKey_nid, PEM_write_PKCS8PrivateKey_nid, PEM_read_bio_PUBKEY, PEM_read_PUBKEY, PEM_write_bio_PUBKEY, PEM_write_PUBKEY, PEM_read_bio_RSAPrivateKey, PEM_read_RSAPrivateKey, PEM_write_bio_RSAPrivateKey, PEM_write_RSAPrivateKey, PEM_read_bio_RSAPublicKey, PEM_read_RSAPublicKey, PEM_write_bio_RSAPublicKey, PEM_write_RSAPublicKey, PEM_read_bio_RSA_PUBKEY, PEM_read_RSA_PUBKEY, PEM_write_bio_RSA_PUBKEY, PEM_write_RSA_PUBKEY, PEM_read_bio_DSAPrivateKey, PEM_read_DSAPrivateKey, PEM_write_bio_DSAPrivateKey, PEM_write_DSAPrivateKey, PEM_read_bio_DSA_PUBKEY, PEM_read_DSA_PUBKEY, PEM_write_bio_DSA_PUBKEY, PEM_write_DSA_PUBKEY, PEM_read_bio_Parameters, PEM_write_bio_Parameters, PEM_read_bio_DSAparams, PEM_read_DSAparams, PEM_write_bio_DSAparams, PEM_write_DSAparams, PEM_read_bio_DHparams, PEM_read_DHparams, PEM_write_bio_DHparams, PEM_write_DHparams, PEM_read_bio_X509, PEM_read_X509, PEM_write_bio_X509, PEM_write_X509, PEM_read_bio_X509_AUX, PEM_read_X509_AUX, PEM_write_bio_X509_AUX, PEM_write_X509_AUX, PEM_read_bio_X509_REQ, PEM_read_X509_REQ, PEM_write_bio_X509_REQ, PEM_write_X509_REQ, PEM_write_bio_X509_REQ_NEW, PEM_write_X509_REQ_NEW, PEM_read_bio_X509_CRL, PEM_read_X509_CRL, PEM_write_bio_X509_CRL, PEM_write_X509_CRL, PEM_read_bio_PKCS7, PEM_read_PKCS7, PEM_write_bio_PKCS7, PEM_write_PKCS7 - PEM routines

DESCRIPTION

The PEM functions read or write structures in PEM format. In this sense PEM format is simply base64 encoded data surrounded by header lines.

For more details about the meaning of arguments see the PEM FUNCTION ARGUMENTS section.

Each operation has four functions associated with it. For brevity the term " TYPE functions" will be used below to collectively refer to the PEM_read_bio_TYPE(), PEM_read_TYPE(), PEM_write_bio_TYPE(), and PEM_write_TYPE() functions.

The PrivateKey functions read or write a private key in PEM format using an EVP_PKEY structure. The write routines use PKCS#8 private key format and are equivalent to PEM_write_bio_PKCS8PrivateKey().The read functions transparently handle traditional and PKCS#8 format encrypted and unencrypted keys.

PEM_write_bio_PrivateKey_traditional() writes out a private key in the "traditional" format with a simple private key marker and should only be used for compatibility with legacy programs.

PEM_write_bio_PKCS8PrivateKey() and PEM_write_PKCS8PrivateKey() write a private key in an EVP_PKEY structure in PKCS#8 EncryptedPrivateKeyInfo format using PKCS#5 v2.0 password based encryption algorithms. The cipher argument specifies the encryption algorithm to use: unlike some other PEM routines the encryption is applied at the PKCS#8 level and not in the PEM headers. If cipher is NULL then no encryption is used and a PKCS#8 PrivateKeyInfo structure is used instead.

PEM_write_bio_PKCS8PrivateKey_nid() and PEM_write_PKCS8PrivateKey_nid() also write out a private key as a PKCS#8 EncryptedPrivateKeyInfo however it uses PKCS#5 v1.5 or PKCS#12 encryption algorithms instead. The algorithm to use is specified in the nid parameter and should be the NID of the corresponding OBJECT IDENTIFIER (see NOTES section).

The PUBKEY functions process a public key using an EVP_PKEY structure. The public key is encoded as a SubjectPublicKeyInfo structure.

The RSAPrivateKey functions process an RSA private key using an RSA structure. The write routines uses traditional format. The read routines handles the same formats as the PrivateKey functions but an error occurs if the private key is not RSA.

The RSAPublicKey functions process an RSA public key using an RSA structure. The public key is encoded using a PKCS#1 RSAPublicKey structure.

The RSA_PUBKEY functions also process an RSA public key using an RSA structure. However, the public key is encoded using a SubjectPublicKeyInfo structure and an error occurs if the public key is not RSA.

The DSAPrivateKey functions process a DSA private key using a DSA structure. The write routines uses traditional format. The read routines handles the same formats as the PrivateKey functions but an error occurs if the private key is not DSA.

The DSA_PUBKEY functions process a DSA public key using a DSA structure. The public key is encoded using a SubjectPublicKeyInfo structure and an error occurs if the public key is not DSA.

The Parameters functions read or write key parameters in PEM format using an EVP_PKEY structure. The encoding depends on the type of key; for DSA key parameters, it will be a Dss-Parms structure as defined in RFC2459, and for DH key parameters, it will be a PKCS#3 DHparameter structure. These functions only exist for the BIO type .

The DSAparams functions process DSA parameters using a DSA structure. The parameters are encoded using a Dss-Parms structure as defined in RFC2459.

The DHparams functions process DH parameters using a DH structure. The parameters are encoded using a PKCS#3 DHparameter structure.

The X509 functions process an X509 certificate using an X509 structure. They will also process a trusted X509 certificate but any trust settings are discarded.

The X509_AUX functions process a trusted X509 certificate using an X509 structure.

The X509_REQ and X509_REQ_NEW functions process a PKCS#10 certificate request using an X509_REQ structure. The X509_REQ write functions use CERTIFICATE REQUEST in the header whereas the X509_REQ_NEW functions use NEW CERTIFICATE REQUEST (as required by some CAs). The X509_REQ read functions will handle either form so there are no X509_REQ_NEW read functions.

The X509_CRL functions process an X509 CRL using an X509_CRL structure.

The PKCS7 functions process a PKCS#7 ContentInfo using a PKCS7 structure.

PEM FUNCTION ARGUMENTS

The PEM functions have many common arguments.

The bp BIO parameter (if present) specifies the BIO to read from or write to.

The fp FILE parameter (if present) specifies the FILE pointer to read from or write to.

The PEM read functions all take an argument TYPE **x and return a TYPE * pointer. Where TYPE is whatever structure the function uses. If x is NULL then the parameter is ignored. If x is not NULL but *x is NULL then the structure returned will be written to *x . If neither x nor *x is NULL then an attempt is made to reuse the structure at *x (but see BUGS and EXAMPLES sections). Irrespective of the value of x a pointer to the structure is always returned (or NULL if an error occurred).

The PEM functions which write private keys take an enc parameter which specifies the encryption algorithm to use, encryption is done at the PEM level. If this parameter is set to NULL then the private key is written in unencrypted form.

The cb argument is the callback to use when querying for the pass phrase used for encrypted PEM structures (normally only private keys).

For the PEM write routines if the kstr parameter is not NULL then klen bytes at kstr are used as the passphrase and cb is ignored.

If the cb parameters is set to NULL and the u parameter is not NULL then the u parameter is interpreted as a null terminated string to use as the passphrase. If both cb and u are NULL then the default callback routine is used which will typically prompt for the passphrase on the current terminal with echoing turned off.

The default passphrase callback is sometimes inappropriate (for example in a GUI application) so an alternative can be supplied. The callback routine has the following form:

buf is the buffer to write the passphrase to. size is the maximum length of the passphrase (i.e. the size of buf). rwflag is a flag which is set to 0 when reading and 1 when writing. A typical routine will ask the user to verify the passphrase (for example by prompting for it twice) if rwflag is 1. The u parameter has the same value as the u parameter passed to the PEM routine. It allows arbitrary data to be passed to the callback by the application (for example a window handle in a GUI application). The callback must return the number of characters in the passphrase or -1 if an error occurred.

The old PrivateKey write routines are retained for compatibility. New applications should write private keys using the PEM_write_bio_PKCS8PrivateKey() or PEM_write_PKCS8PrivateKey() routines because they are more secure (they use an iteration count of 2048 whereas the traditional routines use a count of 1) unless compatibility with older versions of OpenSSL is important.

The PrivateKey read routines can be used in all applications because they handle all formats transparently.

A frequent cause of problems is attempting to use the PEM routines like this:

this is a bug because an attempt will be made to reuse the data at x which is an uninitialised pointer.

These functions make no assumption regarding the pass phrase received from the password callback. It will simply be treated as a byte sequence.

PEM ENCRYPTION FORMAT

These old PrivateKey routines use a non standard technique for encryption.

The private key (or other data) takes the following form:

The line beginning with Proc-Type contains the version and the protection on the encapsulated data. The line beginning DEK-Info contains two comma separated values: the encryption algorithm name as used by EVP_get_cipherbyname() and an initialization vector used by the cipher encoded as a set of hexadecimal digits. After those two lines is the base64-encoded encrypted data.

The encryption key is derived using EVP_BytesToKey(). The cipher's initialization vector is passed to EVP_BytesToKey() as the salt parameter. Internally, PKCS5_SALT_LEN bytes of the salt are used (regardless of the size of the initialization vector). The user's password is passed to EVP_BytesToKey() using the data and datal parameters. Finally, the library uses an iteration count of 1 for EVP_BytesToKey().

The key derived by EVP_BytesToKey() along with the original initialization vector is then used to decrypt the encrypted data. The iv produced by EVP_BytesToKey() is not utilized or needed, and NULL should be passed to the function.

The pseudo code to derive the key would look similar to:

The PEM read routines in some versions of OpenSSL will not correctly reuse an existing structure. Therefore, the following:

where x already contains a valid certificate, may not work, whereas:

is guaranteed to work.

RETURN VALUES

The read routines return either a pointer to the structure read or NULL if an error occurred.

The write routines return 1 for success or 0 for failure.

Although the PEM routines take several arguments in almost all applications most of them are set to 0 or NULL.

Read a certificate in PEM format from a BIO:

Alternative method:

Write a certificate to a BIO:

Write a private key (using traditional format) to a BIO using triple DES encryption, the pass phrase is prompted for:

Write a private key (using PKCS#8 format) to a BIO using triple DES encryption, using the pass phrase "hello":

Read a private key from a BIO using a pass phrase callback:

Skeleton pass phrase callback:

EVP_EncryptInit(3) , EVP_BytesToKey(3) , passphrase-encoding(7)

The old Netscape certificate sequences were no longer documented in OpenSSL 1.1.0; applications should use the PKCS7 standard instead as they will be formally deprecated in a future releases.

Copyright 2001-2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html .

C++ (Cpp) PEM_write_bio_RSAPublicKey Examples

Simple Public Key Encryption with RSA and OpenSSL

Apr 28, 2012

Hey you! This post is outdated!

Take a look at a more correct, detailed, and useful one . What’s the advantage? The EVP functions do implicit symmetric encryption for you so you don’t get hung up on the max length limitations of RSA. Plus, it has an AES implementation.

Disclaimer: I am NOT a crypto expert. Don’t take the information here as 100% correct; you should verify it yourself. You are dangerously bad at crypto.

Last month I wrapped up my Alsa Volume Control server project . To test it, I exposed the server to my public Internet connection and within a few hours, my friend was using the lack of authentication to change the volume on my computer from his apartment. It may not be a serious security hole, and funny as it may be, it would certainly be annoying if someone had malicious intentions in mind. The simple solution is just disable the port forward so the server is only accessible via my LAN, but what fun is that? What if I feel like changing my volume from anywhere for whatever stupid reason I may have?! Thus, I needed to add authentication to the server, which means I also a needed a way to encrypt credentials as they went over the network. And so I opened up the OpenSSL documentation to figure out how to encrypt and decrypt simple messages with RSA in C. Here’s a quick summary…

First up, to do anything with RSA we need a public/private key pair. I assume the reader knows the basic theory behind RSA so I won’t go into the math inside a key pair. If you’re interested, here’s a good write-up on the math behind RSA.

Here we’re using the RSA_generate_key function to generate an RSA public and private key which is stored in an RSA struct. The key length is the first parameter; in this case, a pretty secure 2048 bit key (don’t go lower than 1024, or 4096 for the paranoid), and the public exponent (again, not I’m not going into the math here), is the second parameter.

So we have our key pair. Cool. So how do we encrypt something with it?

The first thing you’ll notice is that the message length is limited to 2048 bits or 256 bytes, which is also our key size. A limitation of RSA is that you cannot encrypt anything longer than the key size, which is 2048 bits in this case. Since we’re reading in chars, which are 1 byte and 2048bits translates to 256 bytes, the theoretical max length of our message is 256 characters long including the null terminator. In practice, this number is going to be slightly less because of the padding the encrypt function tacks on at the end. Through trial and error, I found this number to be around 214 characters for a 2048 bit key.

So we have the message. Let’s encrypt it! We allocate memory for a buffer to store our encrypted message in (encrypt). We can determine the max length of the encrypted message via the RSA_size function. We also allocate some memory for an error buffer, in case there’s a problem encrypting the message like if the message is over the practical max length of a message (~214 bytes). From here, all we have to do is call the RSA_public_encrypt function and let it do it’s magic. We supply the number of bytes to encrypt, the message to encrypt, the buffer to put the encrypted message, they keypair to encrypt with, and finally, the type of padding to use for the message. The padding is where the discrepancy between the theoretical length and practical length comes from. The different types can be found on the documentation page for the RSA_public_encrypt function, but the one used above is the one that should be used for new implementations of RSA.

RSA_public_encrypt will return the number of bytes encrypted, or -1 on failure. If -1 we use the OpenSSL error functions to get a more descriptive error, and print it. The error functions are pretty self-explanatory if you read their documentation, so I won’t go into them here. Another sanity check that I didn’t check for would be to ensure that the number of bytes encrypted returned by RSA_public_encrypt is the key size divided by 8, or 256 in this case. If it isn’t, something isn’t right.

Now let’s decrypt the message! Good news is that if you understood the encryption, decryption is very similar.

We allocate the length of our encrypted message to store the decrypted message in. The decrypted message may only be a few characters long, but we don’t know how it’s exact length prior to decryption, so we allocate the upper bound of its length to avoid any length issues. From here, decryption is a simple call to RSA_private_decrypt with the encrypted length, the encrypted message, the buffer to store the decrypted message in, the key to perform decryption with, and the padding type–all very similar to the encrypt function. RSA_public_decrypt returns -1 on error and we check for errors the same way as the encrypt function.

And that’s it! You can now encrypt and decrypt messages with RSA!

But let’s get a little closer to having something that’s actually useful. Let’s see if we can write our encrypted message to a file, read it back, and then decrypt it.

Writing to a file is actually pretty easy. The one caveat to remember is that we aren’t dealing with plain text anymore–we’re working with binary data now so the usual ways to write to a file like fputs aren’t going to work here. Instead, we utilize fwrite which is going to write the encrypted message buffer to the file verbatim. We should check for errors here, but this is just a quick proof-of-concept.

Reading it back is also just as trivial.

We free’d our encrypted message buffer after writing it to the file above as a proof-of-concept above so we need to allocate memory for it again. After that, remember that this data isn’t plain text so the usual fgets isn’t going to work. We need to use fread which will put the encrypted message back into the encrypt buffer which we can then use to send to the decrypt function above.

Let’s also make sure that the data we wrote the file is really there by firing up a terminal and looking at an od dump of the file we wrote.

Here we can see why the file can’t be read as a regular text file. Some of the values are outside of the range of regular characters! Compare this to the plain text of the message that’s encrypted above (hint: it’s “hello”):

Another thing we can do is separate the key pair into a public key and a private key, because what good does sending both the private and public key to decrypt a message to someone do? Let’s revisit the original code we used to generate the key pair.

We generate the key pair as before (this time with a generalized key length and public exponent), but now we used BIO structs to separate the public and private key. BIO’s are just an OpenSSL abstraction to make our lives easier. We use the PEM_write_bio_RSAPrivateKey function and it’s public key counterpart to copy the private and public keys into the newly created BIO structs . We then use the BIO_pending function to get how long our plain text character strings need to be to store the keys and allocate that amount of memory. From there, BIO_read copies the keys from the BIO structs into the character strings. Finally, let’s print them out for fun. Here’s an example of a key pair I generated via this method:

So that’s a lot of code! Let’s put it all together into one complete example:

To compile it (with debug symbols in case you want to debug it), make sure you have the OpenSSL library installed (libcrypto), and then run:

And there you have it, simple RSA encryption and decryption. I’ll be writing more posts as I further implement this into my Alsa server project on the topics on sending the public key over the network, sending arbitrary size messages with the help of a symmetric cipher (probably AES), doing authentication with Unix users, and doing all this on Android.

pem_write_bio_rsa_pubkey example

[wpseo_breadcrumb]

How do I convert a ssh-keygen public key into a format that openssl PEM_read_bio_RSA_PUBKEY() function will consume?

So I walked into this thinking “Easy, I got this.” Turns out there’s a whole lot more to it than even I thought.

The first issue is that (according to the man pages for OpenSSL, man 3 pem ), OpenSSL is expecting the RSA key to be in PKCS#1 format. Clearly, this isn’t what ssh-keygen is working with. You have two options (from searching around).

If you have OpenSSH v. 5.6 or later (I did not on my laptop), you can run this:

The longer method of doing this is to break apart your SSH key into its various components (the blog entry I found some of this in accuses OpenSSH of being “proprietary”, I prefer to call it “unique”) and then use an ASN1 library to swap things around.

Fortunately for you, someone wrote the code to do this:

https://gist.github.com/1024558

Assuming you have the SSH private key id_rsa , you can extract the public key from it like so:

I realize the OP asked about converting a public key, so this doesn’t quite answer the question, however I thought it would be useful to some anyway.

Note also that this command results in a PEM public key format, which is generally what OpenSSL expects. The answer by Brian, on the other hand, results in a file in RSAPublicKey format, which is not the normal format expected by OpenSSL (though later versions can apparently read it via the -RSAPublicKey_in flag). To convert you can do this:

The format you want is what ssh-keygen calls PKCS8 . So the following command will produce the desired output:

From the ssh-keygen man page:

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What function in OpenSSLv3.0 can replace the "PEM_read_bio_RSAPublicKey" function? #20895

@Lucy0418s

Lucy0418s commented May 6, 2023

@Lucy0418s

KovalevVasiliy commented May 6, 2023 • edited

Sorry, something went wrong.

@paulidale

Lucy0418s commented May 8, 2023

@mattcaswell

mattcaswell commented May 8, 2023

No branches or pull requests

@mattcaswell

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DECLARE_PEM_rw, PEM_read_CMS, PEM_read_bio_CMS, PEM_write_CMS, PEM_write_bio_CMS, PEM_write_DHxparams, PEM_write_bio_DHxparams, PEM_read_ECPKParameters, PEM_read_bio_ECPKParameters, PEM_write_ECPKParameters, PEM_write_bio_ECPKParameters, PEM_read_ECPrivateKey, PEM_write_ECPrivateKey, PEM_write_bio_ECPrivateKey, PEM_read_EC_PUBKEY, PEM_read_bio_EC_PUBKEY, PEM_write_EC_PUBKEY, PEM_write_bio_EC_PUBKEY, PEM_read_NETSCAPE_CERT_SEQUENCE, PEM_read_bio_NETSCAPE_CERT_SEQUENCE, PEM_write_NETSCAPE_CERT_SEQUENCE, PEM_write_bio_NETSCAPE_CERT_SEQUENCE, PEM_read_PKCS8, PEM_read_bio_PKCS8, PEM_write_PKCS8, PEM_write_bio_PKCS8, PEM_write_PKCS8_PRIV_KEY_INFO, PEM_read_bio_PKCS8_PRIV_KEY_INFO, PEM_read_PKCS8_PRIV_KEY_INFO, PEM_write_bio_PKCS8_PRIV_KEY_INFO, PEM_read_SSL_SESSION, PEM_read_bio_SSL_SESSION, PEM_write_SSL_SESSION, PEM_write_bio_SSL_SESSION, PEM_read_X509_PUBKEY, PEM_read_bio_X509_PUBKEY, PEM_write_X509_PUBKEY, PEM_write_bio_X509_PUBKEY - PEM object encoding routines

The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version value, see openssl_user_macros(7) :

DESCRIPTION ¶

All of the functions described on this page are deprecated. Applications should use OSSL_ENCODER_to_bio() and OSSL_DECODER_from_bio() instead.

In the description below, TYPE is used as a placeholder for any of the OpenSSL datatypes, such as X509 . The macro DECLARE_PEM_rw expands to the set of declarations shown in the next four lines of the synopsis.

These routines convert between local instances of ASN1 datatypes and the PEM encoding. For more information on the templates, see ASN1_ITEM(3) . For more information on the lower-level routines used by the functions here, see PEM_read(3) .

PEM_read_ TYPE () reads a PEM-encoded object of TYPE from the file fp and returns it. The cb and u parameters are as described in pem_password_cb(3) .

PEM_read_bio_ TYPE () is similar to PEM_read_ TYPE () but reads from the BIO bp .

PEM_write_ TYPE () writes the PEM encoding of the object a to the file fp .

PEM_write_bio_ TYPE () similarly writes to the BIO bp .

These functions make no assumption regarding the pass phrase received from the password callback. It will simply be treated as a byte sequence.

RETURN VALUES ¶

PEM_read_ TYPE () and PEM_read_bio_ TYPE () return a pointer to an allocated object, which should be released by calling TYPE _free (), or NULL on error.

PEM_write_ TYPE () and PEM_write_bio_ TYPE () return 1 for success or 0 for failure.

PEM_read(3) , passphrase-encoding(7)

The functions PEM_write_DHxparams() , PEM_write_bio_DHxparams() , PEM_read_ECPKParameters() , PEM_read_bio_ECPKParameters() , PEM_write_ECPKParameters() , PEM_write_bio_ECPKParameters() , PEM_read_EC_PUBKEY() , PEM_read_bio_EC_PUBKEY() , PEM_write_EC_PUBKEY() , PEM_write_bio_EC_PUBKEY() , PEM_read_ECPrivateKey() , PEM_read_bio_ECPrivateKey() , PEM_write_ECPrivateKey() and PEM_write_bio_ECPrivateKey() were deprecated in OpenSSL 3.0.

COPYRIGHT ¶

Copyright 1998-2023 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at < https://www.openssl.org/source/license.html >.

debiman 74fb94d, see github.com/Debian/debiman . Found a problem? See the FAQ .

Function openssl_sys :: PEM_write_bio_RSA_PUBKEY [ − ] [src]

[ − ] [src] Function openssl_sys :: PEM_read_bio_RSA_PUBKEY

Help Keyboard Shortcuts ? Show this help dialog S Focus the search field ↑ Move up in search results ↓ Move down in search results ↹ Switch tab ⏎ Go to active search result + Expand all sections - Collapse all sections Search Tricks Prefix searches with a type followed by a colon (e.g., fn: ) to restrict the search to a given type.

IMAGES

  1. Generate Public Key From Pem

    pem_write_bio_rsa_pubkey example

  2. RSA Key Formats

    pem_write_bio_rsa_pubkey example

  3. How do I convert a ssh-keygen public key into a format that openssl PEM

    pem_write_bio_rsa_pubkey example

  4. RSA Key Formats

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    pem_write_bio_rsa_pubkey example

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COMMENTS

  1. Reading Public/Private Key from Memory with OpenSSL

    3 Answers. Sorted by: 25. You are on the right track. You must wrap the PEM key already in memory by means of a BIO buffer via BIO_new_mem_buf (). In other words, something like: BIO *bufio; RSA *rsa bufio = BIO_new_mem_buf ( (void*)pem_key_buffer, pem_key_buffer_len); PEM_read_bio_RSAPublicKey (bufio, &rsa, 0, NULL); The same approach is valid ...

  2. /docs/man1.1.1/man3/PEM_write_bio_PUBKEY.html

    Each operation has four functions associated with it. For brevity the term " TYPE functions" will be used below to collectively refer to the PEM_read_bio_TYPE (), PEM_read_TYPE (), PEM_write_bio_TYPE (), and PEM_write_TYPE () functions. The PrivateKey functions read or write a private key in PEM format using an EVP_PKEY structure.

  3. C++ (Cpp) PEM_write_bio_RSAPublicKey Examples

    Method/Function: PEM_write_bio_RSAPublicKey. Examples at hotexamples.com: 26. C++ (Cpp) PEM_write_bio_RSAPublicKey - 26 examples found. These are the top rated real world C++ (Cpp) examples of PEM_write_bio_RSAPublicKey extracted from open source projects. You can rate examples to help us improve the quality of examples. Example #1. 0. Show file.

  4. How do I convert a ssh-keygen public key into a format that openssl PEM

    I'm having an issue generating a public key that the openssl PEM_read_bio_RSA_PUBKEY() function can consume. I keep getting errors. Obviously I cannot simply use the ASCII string in the ssh-keygen <>.pub key file as it is in SSH file format or I perhaps SubjectPublicKeyInfo structure.. Here's the key gen code: ssh-keygen -t rsa -b 1024 -C "Test Key" I found a converter in php on the web which ...

  5. How to load RSA key in PEM format using Openssl 3.0

    I was asked to update my Openssl version from 1.1.1q to 3.0.7. And at load key part, The previous function is deprecated, so I don't know how to load RSA Key from PEM file. The previous function I use: RSA *g_RSA = NULL; g_RSA = PEM_read_bio_RSA_PUBKEY (bp, NULL, NULL, NULL); g_RSA = PEM_read_bio_RSAPublicKey (bp, NULL, NULL, NULL); The ...

  6. RSA Public Key Format

    At the time of writing, the 2048-bit RSA certificate is the typical key length in real-world use. Considering security, 2048-bit RSA keys offer sufficient security for now. However, a 3072-bit RSA key is recommended for beyond 2030. The derived public key in PEM format (X509 SubjectPublicKeyInfo) is as follows:

  7. How does RSA get a pem string, and then how does RSA convert a pem

    Actually, PEM_write_bio_RSAPrivateKey does write the key pair, as the OpenSSL assumption is that the private key also contains the public bits. This is also assumed by the standards that have anything to say about the serialized form of a key, such as PKCS#1 and PKCS#8.

  8. How to read a public key from a pem file using BIO from openssl?

    His code is reading an RSA public key out of a public key PEM file. It should work as written, as long as the PEM file is valid. For example, this code won't work if the PEM file is an X509 certificate file, even though it contains a public key. -

  9. Simple Public Key Encryption with RSA and OpenSSL

    If you're interested, here's a good write-up on the math behind RSA. 1. RSA *keypair = RSA_generate_key(2048, 3, NULL, NULL); Here we're using the RSA_generate_key function to generate an RSA public and private key which is stored in an RSA struct. The key length is the first parameter; in this case, a pretty secure 2048 bit key (don't ...

  10. How do I convert a ssh-keygen public key into a format that openssl PEM

    To convert you can do this: openssl rsa -RSAPublicKey_in -in id_rsa.rsapub.pem -pubout -out id_rsa.pub.pem. The format you want is what ssh-keygen calls PKCS8. So the following command will produce the desired output: ssh-keygen -f key.pub -e -m pkcs8. From the ssh-keygen man page: -m key_format Specify a key format for the -i (import) or -e ...

  11. PEM_read_bio_RSA_PUBKEY method return NULL;error:2007507E ...

    elton-wang-ch changed the title PEM_read_bio_RSA_PUBKEY method return NULL PEM_read_bio_RSA_PUBKEY method return NULL;error:2007507E:BIO routines:MEM_WRITE:write to read only BIO Nov 30, 2018 Copy link

  12. pem_write_bio_rsa_pubkey(3): PEM routines

    The PrivateKey functions read or write a private key in PEM format using an EVP_PKEY structure. The write routines use "traditional" private key format and can handle both RSA and DSA private keys. The read functions can additionally transparently handle PKCS#8 format encrypted and unencrypted keys too. PEM_write_bio_PKCS8PrivateKey () and PEM ...

  13. Reading and writing rsa keys to a pem file in C

    16. I am writing a C program to generate keys for RSA and write them to a file and then read from them. The homework requires me to generate the files in a openssl format. So, I chose PEM. Now, I have the following function for creating the file. rsa = RSA_new (); // These 3 keys are generated beforehand rsa->e = e; rsa->n = n; rsa->d = d; fp ...

  14. Ubuntu Manpage: migration_guide

    All algorithm implementations available via providers are accessed through the "high level" APIs (for example those functions prefixed with "EVP"). They cannot be accessed using the "Low Level APIs". ... PEM_write_bio_RSA_PUBKEY(), PEM_write_bio_RSAPublicKey(), See "Deprecated low-level key reading and writing functions" • PKCS1_MGF1() See ...

  15. What function in OpenSSLv3.0 can replace the "PEM_read_bio ...

    when using "PEM_read_bio_RSAPublicKey" function, the public key is encoded using a PKCS#1 RSAPublicKey structure. But this function is deprecated in OpenSSLv3.0. Then I use "PEM_read_bio_PUBKEY" bu...

  16. PEM_write_bio_EC_PUBKEY(3ssl)

    PEM_read_TYPE () reads a PEM-encoded object of TYPE from the file fp and returns it. The cb and u parameters are as described in pem_password_cb (3). PEM_read_bio_TYPE () is similar to PEM_read_TYPE () but reads from the BIO bp. PEM_write_TYPE () writes the PEM encoding of the object a to the file fp. PEM_write_bio_TYPE () similarly writes to ...

  17. openssl_sys::PEM_write_bio_RSA_PUBKEY

    Search Tricks. Prefix searches with a type followed by a colon (e.g. fn:) to restrict the search to a given type. Accepted types are: fn, mod, struct, enum, trait, type, macro, and const. Search functions by type signature (e.g. vec -> usize or * -> vec)

  18. openssl

    After messing with the OpenSSL lib. and learned a way to dive into it documentation. here it is the answer to write the PEM file from RSA object. BIO *bio_private; bio_private = BIO_new_file ("private_new.pem", "w+"); PEM_write_bio_RSAPrivateKey (bio_private, rsa, 0, 0, 0, 0, 0); Share. Improve this answer. Follow. answered Jul 24, 2022 at 14:11.

  19. openssl_sys::PEM_read_bio_RSA_PUBKEY

    Search Tricks. Prefix searches with a type followed by a colon (e.g., fn:) to restrict the search to a given type. Accepted types are: fn, mod, struct, enum, trait, type, macro, and const. Search functions by type signature (e.g., vec -> usize or * -> vec) Search multiple things at once by splitting your query with comma (e.g., str,u8 or String,struct:Vec,test)

  20. [openssl-users] PEM_write_bio_RSAPrivateKey assure Randomness of PK

    Notice BEGIN PUBLIC KEY PEM_write_bio_RSAPublicKey (PKCS PEM format). Notice BEGIN RSA PUBLIC KEY PEM_write_bio_PrivateKey (PEM). Notice BEGIN PRIVATE KEY PEM_write_bio_PKCS8PrivateKey (PEM). Notice BEGIN PRIVATE KEY PEM_write_bio_RSAPrivateKey (PEM).

  21. How to encrypt and write RSA private key to file with PEM_Write_RSA

    int PEM_write_RSAPrivateKey(FILE *fp, RSA *x, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u); The way I call the function : PEM_write_RSAPrivateKey(pFile, pRSA,NULL,0,NULL,NULL,(void*)passphrase); In openssl's documents,it says the last parameter is passphrase,but I find the context in the output file is ...