PEM_do_header.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" PEM_write, PEM_write_bio, PEM_read, PEM_read_bio, PEM_do_header, PEM_get_EVP_CIPHER_INFO \&\- PEM encoding routines .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/pem.h> \& \& int PEM_write(FILE *fp, const char *name, const char *header, \& const unsigned char *data, long len) \& int PEM_write_bio(BIO *bp, const char *name, const char *header, \& const unsigned char *data, long len) \& \& int PEM_read(FILE *fp, char **name, char **header, \& unsigned char **data, long *len); \& int PEM_read_bio(BIO *bp, char **name, char **header, \& unsigned char **data, long *len); \& \& int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cinfo); \& int PEM_do_header(EVP_CIPHER_INFO *cinfo, unsigned char *data, long *len, \& pem_password_cb *cb, void *u); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions read and write PEM-encoded objects, using the \s-1PEM\s0 type \fBname\fR, any additional \fBheader\fR information, and the raw \&\fBdata\fR of length \fBlen\fR. .PP \&\s-1PEM\s0 is the term used for binary content encoding first defined in \s-1IETF RFC 1421.\s0 The content is a series of base64\-encoded lines, surrounded by begin/end markers each on their own line. For example: .PP .Vb 4 \& \-\-\-\-\-BEGIN PRIVATE KEY\-\-\-\-\- \& MIICdg.... \& ... bhTQ== \& \-\-\-\-\-END PRIVATE KEY\-\-\-\-\- .Ve .PP Optional header line(s) may appear after the begin line, and their existence depends on the type of object being written or read. .PP \&\fBPEM_write()\fR writes to the file \fBfp\fR, while \fBPEM_write_bio()\fR writes to the \s-1BIO\s0 \fBbp\fR. The \fBname\fR is the name to use in the marker, the \&\fBheader\fR is the header value or \s-1NULL,\s0 and \fBdata\fR and \fBlen\fR specify the data and its length. .PP The final \fBdata\fR buffer is typically an \s-1ASN.1\s0 object which can be decoded with the \fBd2i\fR function appropriate to the type \fBname\fR; see \fBd2i_X509\fR\|(3) for examples. .PP \&\fBPEM_read()\fR reads from the file \fBfp\fR, while \fBPEM_read_bio()\fR reads from the \s-1BIO\s0 \fBbp\fR. Both skip any non-PEM data that precedes the start of the next \s-1PEM\s0 object. When an object is successfully retrieved, the type name from the \*(L"\-\-\-\-BEGIN <type>\-\-\-\-\-\*(R" is returned via the \fBname\fR argument, any encapsulation headers are returned in \fBheader\fR and the base64\-decoded content and its length are returned via \fBdata\fR and \fBlen\fR respectively. The \fBname\fR, \fBheader\fR and \fBdata\fR pointers are allocated via \fBOPENSSL_malloc()\fR and should be freed by the caller via \fBOPENSSL_free()\fR when no longer needed. .PP \&\fBPEM_get_EVP_CIPHER_INFO()\fR can be used to determine the \fBdata\fR returned by \&\fBPEM_read()\fR or \fBPEM_read_bio()\fR is encrypted and to retrieve the associated cipher and \s-1IV.\s0 The caller passes a pointer to structure of type \fB\s-1EVP_CIPHER_INFO\s0\fR via the \&\fBcinfo\fR argument and the \fBheader\fR returned via \fBPEM_read()\fR or \fBPEM_read_bio()\fR. If the call is successful 1 is returned and the cipher and \s-1IV\s0 are stored at the address pointed to by \fBcinfo\fR. When the header is malformed, or not supported or when the cipher is unknown or some internal error happens 0 is returned. This function is deprecated, see \fB\s-1NOTES\s0\fR below. .PP \&\fBPEM_do_header()\fR can then be used to decrypt the data if the header indicates encryption. The \fBcinfo\fR argument is a pointer to the structure initialized by the previous call to \fBPEM_get_EVP_CIPHER_INFO()\fR. The \fBdata\fR and \fBlen\fR arguments are those returned by the previous call to \&\fBPEM_read()\fR or \fBPEM_read_bio()\fR. The \fBcb\fR and \fBu\fR arguments make it possible to override the default password prompt function as described in \fBPEM_read_PrivateKey\fR\|(3). On successful completion the \fBdata\fR is decrypted in place, and \fBlen\fR is updated to indicate the plaintext length. This function is deprecated, see \fB\s-1NOTES\s0\fR below. .PP If the data is a priori known to not be encrypted, then neither \fBPEM_do_header()\fR nor \fBPEM_get_EVP_CIPHER_INFO()\fR need be called. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBPEM_read()\fR and \fBPEM_read_bio()\fR return 1 on success and 0 on failure, the latter includes the case when no more \s-1PEM\s0 objects remain in the input file. To distinguish end of file from more serious errors the caller must peek at the error stack and check for \fB\s-1PEM_R_NO_START_LINE\s0\fR, which indicates that no more \&\s-1PEM\s0 objects were found. See \fBERR_peek_last_error\fR\|(3), \s-1\fBERR_GET_REASON\s0\fR\|(3). .PP \&\fBPEM_get_EVP_CIPHER_INFO()\fR and \fBPEM_do_header()\fR return 1 on success, and 0 on failure. The \fBdata\fR is likely meaningless if these functions fail. .SH "NOTES" .IX Header "NOTES" The \fBPEM_get_EVP_CIPHER_INFO()\fR and \fBPEM_do_header()\fR functions are deprecated. This is because the underlying \s-1PEM\s0 encryption format is obsolete, and should be avoided. It uses an encryption format with an OpenSSL-specific key-derivation function, which employs \s-1MD5\s0 with an iteration count of 1! Instead, private keys should be stored in PKCS#8 form, with a strong PKCS#5 v2.0 \s-1PBE.\s0 See \fBPEM_write_PrivateKey\fR\|(3) and \fBd2i_PKCS8PrivateKey_bio\fR\|(3). .PP \&\fBPEM_do_header()\fR makes no assumption regarding the pass phrase received from the password callback. It will simply be treated as a byte sequence. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_peek_last_error\fR\|(3), \s-1\fBERR_GET_LIB\s0\fR\|(3), \&\fBd2i_PKCS8PrivateKey_bio\fR\|(3), \&\fBpassphrase\-encoding\fR\|(7) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 1998\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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