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pem(3)                              OpenSSL                             pem(3)

NAME

PEM, PEM_read_bio_PrivateKey, PEM_read_PrivateKey, PEM_write_bio_PrivateKey, 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_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_read_bio_NETSCAPE_CERT_SEQUENCE, PEM_read_NETSCAPE_CERT_SEQUENCE, PEM_write_bio_NETSCAPE_CERT_SEQUENCE, PEM_write_NETSCAPE_CERT_SEQUENCE - PEM routines

SYNOPSIS

#include <openssl/pem.h> EVP_PKEY *PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u); EVP_PKEY *PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u); int PEM_write_bio_PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u); int PEM_write_PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u); int PEM_write_bio_PKCS8PrivateKey(BIO *bp, EVP_PKEY *x, const EVP_CIPHER *enc, char *kstr, int klen, pem_password_cb *cb, void *u); int PEM_write_PKCS8PrivateKey(FILE *fp, EVP_PKEY *x, const EVP_CIPHER *enc, char *kstr, int klen, pem_password_cb *cb, void *u); int PEM_write_bio_PKCS8PrivateKey_nid(BIO *bp, EVP_PKEY *x, int nid, char *kstr, int klen, pem_password_cb *cb, void *u); int PEM_write_PKCS8PrivateKey_nid(FILE *fp, EVP_PKEY *x, int nid, char *kstr, int klen, pem_password_cb *cb, void *u); EVP_PKEY *PEM_read_bio_PUBKEY(BIO *bp, EVP_PKEY **x, pem_password_cb *cb, void *u); EVP_PKEY *PEM_read_PUBKEY(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u); int PEM_write_bio_PUBKEY(BIO *bp, EVP_PKEY *x); int PEM_write_PUBKEY(FILE *fp, EVP_PKEY *x); RSA *PEM_read_bio_RSAPrivateKey(BIO *bp, RSA **x, pem_password_cb *cb, void *u); RSA *PEM_read_RSAPrivateKey(FILE *fp, RSA **x, pem_password_cb *cb, void *u); int PEM_write_bio_RSAPrivateKey(BIO *bp, RSA *x, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u); int PEM_write_RSAPrivateKey(FILE *fp, RSA *x, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u); RSA *PEM_read_bio_RSAPublicKey(BIO *bp, RSA **x, pem_password_cb *cb, void *u); RSA *PEM_read_RSAPublicKey(FILE *fp, RSA **x, pem_password_cb *cb, void *u); int PEM_write_bio_RSAPublicKey(BIO *bp, RSA *x); int PEM_write_RSAPublicKey(FILE *fp, RSA *x); RSA *PEM_read_bio_RSA_PUBKEY(BIO *bp, RSA **x, pem_password_cb *cb, void *u); RSA *PEM_read_RSA_PUBKEY(FILE *fp, RSA **x, pem_password_cb *cb, void *u); int PEM_write_bio_RSA_PUBKEY(BIO *bp, RSA *x); int PEM_write_RSA_PUBKEY(FILE *fp, RSA *x); DSA *PEM_read_bio_DSAPrivateKey(BIO *bp, DSA **x, pem_password_cb *cb, void *u); DSA *PEM_read_DSAPrivateKey(FILE *fp, DSA **x, pem_password_cb *cb, void *u); int PEM_write_bio_DSAPrivateKey(BIO *bp, DSA *x, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u); int PEM_write_DSAPrivateKey(FILE *fp, DSA *x, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u); DSA *PEM_read_bio_DSA_PUBKEY(BIO *bp, DSA **x, pem_password_cb *cb, void *u); DSA *PEM_read_DSA_PUBKEY(FILE *fp, DSA **x, pem_password_cb *cb, void *u); int PEM_write_bio_DSA_PUBKEY(BIO *bp, DSA *x); int PEM_write_DSA_PUBKEY(FILE *fp, DSA *x); DSA *PEM_read_bio_DSAparams(BIO *bp, DSA **x, pem_password_cb *cb, void *u); DSA *PEM_read_DSAparams(FILE *fp, DSA **x, pem_password_cb *cb, void *u); int PEM_write_bio_DSAparams(BIO *bp, DSA *x); int PEM_write_DSAparams(FILE *fp, DSA *x); DH *PEM_read_bio_DHparams(BIO *bp, DH **x, pem_password_cb *cb, void *u); DH *PEM_read_DHparams(FILE *fp, DH **x, pem_password_cb *cb, void *u); int PEM_write_bio_DHparams(BIO *bp, DH *x); int PEM_write_DHparams(FILE *fp, DH *x); X509 *PEM_read_bio_X509(BIO *bp, X509 **x, pem_password_cb *cb, void *u); X509 *PEM_read_X509(FILE *fp, X509 **x, pem_password_cb *cb, void *u); int PEM_write_bio_X509(BIO *bp, X509 *x); int PEM_write_X509(FILE *fp, X509 *x); X509 *PEM_read_bio_X509_AUX(BIO *bp, X509 **x, pem_password_cb *cb, void *u); X509 *PEM_read_X509_AUX(FILE *fp, X509 **x, pem_password_cb *cb, void *u); int PEM_write_bio_X509_AUX(BIO *bp, X509 *x); int PEM_write_X509_AUX(FILE *fp, X509 *x); X509_REQ *PEM_read_bio_X509_REQ(BIO *bp, X509_REQ **x, pem_password_cb *cb, void *u); X509_REQ *PEM_read_X509_REQ(FILE *fp, X509_REQ **x, pem_password_cb *cb, void *u); int PEM_write_bio_X509_REQ(BIO *bp, X509_REQ *x); int PEM_write_X509_REQ(FILE *fp, X509_REQ *x); int PEM_write_bio_X509_REQ_NEW(BIO *bp, X509_REQ *x); int PEM_write_X509_REQ_NEW(FILE *fp, X509_REQ *x); X509_CRL *PEM_read_bio_X509_CRL(BIO *bp, X509_CRL **x, pem_password_cb *cb, void *u); X509_CRL *PEM_read_X509_CRL(FILE *fp, X509_CRL **x, pem_password_cb *cb, void *u); int PEM_write_bio_X509_CRL(BIO *bp, X509_CRL *x); int PEM_write_X509_CRL(FILE *fp, X509_CRL *x); PKCS7 *PEM_read_bio_PKCS7(BIO *bp, PKCS7 **x, pem_password_cb *cb, void *u); PKCS7 *PEM_read_PKCS7(FILE *fp, PKCS7 **x, pem_password_cb *cb, void *u); int PEM_write_bio_PKCS7(BIO *bp, PKCS7 *x); int PEM_write_PKCS7(FILE *fp, PKCS7 *x); NETSCAPE_CERT_SEQUENCE *PEM_read_bio_NETSCAPE_CERT_SEQUENCE(BIO *bp, NETSCAPE_CERT_SEQUENCE **x, pem_password_cb *cb, void *u); NETSCAPE_CERT_SEQUENCE *PEM_read_NETSCAPE_CERT_SEQUENCE(FILE *fp, NETSCAPE_CERT_SEQUENCE **x, pem_password_cb *cb, void *u); int PEM_write_bio_NETSCAPE_CERT_SEQUENCE(BIO *bp, NETSCAPE_CERT_SEQUENCE *x); int PEM_write_NETSCAPE_CERT_SEQUENCE(FILE *fp, NETSCAPE_CERT_SEQUENCE *x);

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 clarity the term "foobar functions" will be used to collectively refer to the PEM_read_bio_foobar(), PEM_read_foobar(), PEM_write_bio_foobar() and PEM_write_foobar() functions. 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_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 all 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. It 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. It 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 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. The NETSCAPE_CERT_SEQUENCE functions process a Netscape Certificate Sequence using a NETSCAPE_CERT_SEQUENCE 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: int cb(char *buf, int size, int rwflag, void *u); 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 0 if an error occurred.

EXAMPLES

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: X509 *x; x = PEM_read_bio_X509(bp, NULL, 0, NULL); if (x == NULL) { /* Error */ } Alternative method: X509 *x = NULL; if (!PEM_read_bio_X509(bp, &x, 0, NULL)) { /* Error */ } Write a certificate to a BIO: if (!PEM_write_bio_X509(bp, x)) { /* Error */ } Write an unencrypted private key to a FILE pointer: if (!PEM_write_PrivateKey(fp, key, NULL, NULL, 0, 0, NULL)) { /* Error */ } Write a private key (using traditional format) to a BIO using triple DES encryption, the pass phrase is prompted for: if (!PEM_write_bio_PrivateKey(bp, key, EVP_des_ede3_cbc(), NULL, 0, 0, NULL)) { /* Error */ } Write a private key (using PKCS#8 format) to a BIO using triple DES encryption, using the pass phrase "hello": if (!PEM_write_bio_PKCS8PrivateKey(bp, key, EVP_des_ede3_cbc(), NULL, 0, 0, "hello")) { /* Error */ } Read a private key from a BIO using the pass phrase "hello": key = PEM_read_bio_PrivateKey(bp, NULL, 0, "hello"); if (key == NULL) { /* Error */ } Read a private key from a BIO using a pass phrase callback: key = PEM_read_bio_PrivateKey(bp, NULL, pass_cb, "My Private Key"); if (key == NULL) { /* Error */ } Skeleton pass phrase callback: int pass_cb(char *buf, int size, int rwflag, void *u); { int len; char *tmp; /* We'd probably do something else if 'rwflag' is 1 */ printf("Enter pass phrase for \"%s\"\n", u); /* get pass phrase, length 'len' into 'tmp' */ tmp = "hello"; len = strlen(tmp); if (len <= 0) return 0; /* if too long, truncate */ if (len > size) len = size; memcpy(buf, tmp, len); return len; }

NOTES

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: X509 *x; PEM_read_bio_X509(bp, &x, 0, NULL); this is a bug because an attempt will be made to reuse the data at x which is an uninitialised pointer.

PEM ENCRYPTION FORMAT

This old PrivateKey routines use a non standard technique for encryption. The private key (or other data) takes the following form: -----BEGIN RSA PRIVATE KEY----- Proc-Type: 4,ENCRYPTED DEK-Info: DES-EDE3-CBC,3F17F5316E2BAC89 ...base64 encoded data... -----END RSA PRIVATE KEY----- The line beginning DEK-Info contains two comma separated pieces of information: the encryption algorithm name as used by EVP_get_cipherbyname() and an 8 byte salt encoded as a set of hexadecimal digits. After this is the base64 encoded encrypted data. The encryption key is determined using EVP_BytesToKey(), using salt and an iteration count of 1. The IV used is the value of salt and *not* the IV returned by EVP_BytesToKey().

BUGS

The PEM read routines in some versions of OpenSSL will not correctly reuse an existing structure. Therefore the following: PEM_read_bio_X509(bp, &x, 0, NULL); where x already contains a valid certificate, may not work, whereas: X509_free(x); x = PEM_read_bio_X509(bp, NULL, 0, NULL); is guaranteed to work.

RETURN CODES

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.

SEE ALSO

EVP_get_cipherbyname(3), EVP_BytesToKey(3) 1.0.2h 2016-05-03 pem(3) PEM_BYTES_READ_BIO(3) OpenSSL PEM_BYTES_READ_BIO(3)

NAME

PEM_bytes_read_bio, PEM_bytes_read_bio_secmem - read a PEM-encoded data structure from a BIO

SYNOPSIS

#include <openssl/pem.h> int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm, const char *name, BIO *bp, pem_password_cb *cb, void *u); int PEM_bytes_read_bio_secmem(unsigned char **pdata, long *plen, char **pnm, const char *name, BIO *bp, pem_password_cb *cb, void *u);

DESCRIPTION

PEM_bytes_read_bio() reads PEM-formatted (IETF RFC 1421 and IETF RFC 7468) data from the BIO bp for the data type given in name (RSA PRIVATE KEY, CERTIFICATE, etc.). If multiple PEM-encoded data structures are present in the same stream, PEM_bytes_read_bio() will skip non-matching data types and continue reading. Non-PEM data present in the stream may cause an error. The PEM header may indicate that the following data is encrypted; if so, the data will be decrypted, waiting on user input to supply a passphrase if needed. The password callback cb and rock u are used to obtain the decryption passphrase, if applicable. Some data types have compatibility aliases, such as a file containing X509 CERTIFICATE matching a request for the deprecated type CERTIFICATE. The actual type indicated by the file is returned in *pnm if pnm is non-NULL. The caller must free the storage pointed to by *pnm. The returned data is the DER-encoded form of the requested type, in *pdata with length *plen. The caller must free the storage pointed to by *pdata. PEM_bytes_read_bio_secmem() is similar to PEM_bytes_read_bio(), but uses memory from the secure heap for its temporary buffers and the storage returned in *pdata and *pnm. Accordingly, the caller must use OPENSSL_secure_free() to free that storage.

NOTES

PEM_bytes_read_bio_secmem() only enforces that the secure heap is used for storage allocated within the PEM processing stack. The BIO stack from which input is read may also use temporary buffers, which are not necessarily allocated from the secure heap. In cases where it is desirable to ensure that the contents of the PEM file only appears in memory from the secure heap, care is needed in generating the BIO passed as bp. In particular, the use of BIO_s_file() indicates the use of the operating system stdio functionality, which includes buffering as a feature; BIO_s_fd() is likely to be more appropriate in such cases. 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_bytes_read_bio() and PEM_bytes_read_bio_secmem() return 1 for success or 0 for failure.

SEE ALSO

PEM_read_bio_ex(3), passphrase-encoding(7)

HISTORY

PEM_bytes_read_bio_secmem() was introduced in OpenSSL 1.1.1

COPYRIGHT

Copyright 2017-2018 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>. 1.1.1q 2022-07-05 PEM_BYTES_READ_BIO(3)

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