.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" d2i_DSAPrivateKey, d2i_DSAPrivateKey_bio, d2i_DSAPrivateKey_fp, d2i_DSAPublicKey, d2i_DSA_PUBKEY, d2i_DSA_PUBKEY_bio, d2i_DSA_PUBKEY_fp, d2i_DSAparams, d2i_RSAPrivateKey, d2i_RSAPrivateKey_bio, d2i_RSAPrivateKey_fp, d2i_RSAPublicKey, d2i_RSAPublicKey_bio, d2i_RSAPublicKey_fp, d2i_RSA_PUBKEY, d2i_RSA_PUBKEY_bio, d2i_RSA_PUBKEY_fp, d2i_DHparams, d2i_DHparams_bio, d2i_DHparams_fp, d2i_ECParameters, d2i_ECPrivateKey, d2i_ECPrivateKey_bio, d2i_ECPrivateKey_fp, d2i_EC_PUBKEY, d2i_EC_PUBKEY_bio, d2i_EC_PUBKEY_fp, i2d_RSAPrivateKey, i2d_RSAPrivateKey_bio, i2d_RSAPrivateKey_fp, i2d_RSAPublicKey, i2d_RSAPublicKey_bio, i2d_RSAPublicKey_fp, i2d_RSA_PUBKEY, i2d_RSA_PUBKEY_bio, i2d_RSA_PUBKEY_fp, i2d_DHparams, i2d_DHparams_bio, i2d_DHparams_fp, i2d_DSAPrivateKey, i2d_DSAPrivateKey_bio, i2d_DSAPrivateKey_fp, i2d_DSAPublicKey, i2d_DSA_PUBKEY, i2d_DSA_PUBKEY_bio, i2d_DSA_PUBKEY_fp, i2d_DSAparams, i2d_ECParameters, i2d_ECPrivateKey, i2d_ECPrivateKey_bio, i2d_ECPrivateKey_fp, i2d_EC_PUBKEY, i2d_EC_PUBKEY_bio, i2d_EC_PUBKEY_fp \&\- DEPRECATED .SH "SYNOPSIS" .IX Header "SYNOPSIS" The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value, see \fBopenssl_user_macros\fR\|(7): .PP .Vb 12 \& TYPE *d2i_TYPEPrivateKey(TYPE **a, const unsigned char **ppin, long length); \& TYPE *d2i_TYPEPrivateKey_bio(BIO *bp, TYPE **a); \& TYPE *d2i_TYPEPrivateKey_fp(FILE *fp, TYPE **a); \& TYPE *d2i_TYPEPublicKey(TYPE **a, const unsigned char **ppin, long length); \& TYPE *d2i_TYPEPublicKey_bio(BIO *bp, TYPE **a); \& TYPE *d2i_TYPEPublicKey_fp(FILE *fp, TYPE **a); \& TYPE *d2i_TYPEparams(TYPE **a, const unsigned char **ppin, long length); \& TYPE *d2i_TYPEparams_bio(BIO *bp, TYPE **a); \& TYPE *d2i_TYPEparams_fp(FILE *fp, TYPE **a); \& TYPE *d2i_TYPE_PUBKEY(TYPE **a, const unsigned char **ppin, long length); \& TYPE *d2i_TYPE_PUBKEY_bio(BIO *bp, TYPE **a); \& TYPE *d2i_TYPE_PUBKEY_fp(FILE *fp, TYPE **a); \& \& int i2d_TYPEPrivateKey(const TYPE *a, unsigned char **ppout); \& int i2d_TYPEPrivateKey(TYPE *a, unsigned char **ppout); \& int i2d_TYPEPrivateKey_fp(FILE *fp, const TYPE *a); \& int i2d_TYPEPrivateKey_fp(FILE *fp, TYPE *a); \& int i2d_TYPEPrivateKey_bio(BIO *bp, const TYPE *a); \& int i2d_TYPEPrivateKey_bio(BIO *bp, TYPE *a); \& int i2d_TYPEPublicKey(const TYPE *a, unsigned char **ppout); \& int i2d_TYPEPublicKey(TYPE *a, unsigned char **ppout); \& int i2d_TYPEPublicKey_fp(FILE *fp, const TYPE *a); \& int i2d_TYPEPublicKey_fp(FILE *fp, TYPE *a); \& int i2d_TYPEPublicKey_bio(BIO *bp, const TYPE *a); \& int i2d_TYPEPublicKey_bio(BIO *bp, TYPE *a); \& int i2d_TYPEparams(const TYPE *a, unsigned char **ppout); \& int i2d_TYPEparams(TYPE *a, unsigned char **ppout); \& int i2d_TYPEparams_fp(FILE *fp, const TYPE *a); \& int i2d_TYPEparams_fp(FILE *fp, TYPE *a); \& int i2d_TYPEparams_bio(BIO *bp, const TYPE *a); \& int i2d_TYPEparams_bio(BIO *bp, TYPE *a); \& int i2d_TYPE_PUBKEY(const TYPE *a, unsigned char **ppout); \& int i2d_TYPE_PUBKEY(TYPE *a, unsigned char **ppout); \& int i2d_TYPE_PUBKEY_fp(FILE *fp, const TYPE *a); \& int i2d_TYPE_PUBKEY_fp(FILE *fp, TYPE *a); \& int i2d_TYPE_PUBKEY_bio(BIO *bp, const TYPE *a); \& int i2d_TYPE_PUBKEY_bio(BIO *bp, TYPE *a); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" All functions described here are deprecated. Please use \s-1\fBOSSL_DECODER\s0\fR\|(3) instead of the \fBd2i\fR functions and \s-1\fBOSSL_ENCODER\s0\fR\|(3) instead of the \fBi2d\fR functions. See \*(L"Migration\*(R" below. .PP In the description here, \fB\f(BI\s-1TYPE\s0\fB\fR is used a placeholder for any of the OpenSSL datatypes, such as \fB\s-1RSA\s0\fR. The function parameters \fIppin\fR and \fIppout\fR are generally either both named \&\fIpp\fR in the headers, or \fIin\fR and \fIout\fR. .PP All the functions here behave the way that's described in \fBd2i_X509\fR\|(3). .PP Please note that not all functions in the synopsis are available for all key types. For example, there are no \fBd2i_RSAparams()\fR or \fBi2d_RSAparams()\fR, because the PKCS#1 \fB\s-1RSA\s0\fR structure doesn't include any key parameters. .PP \&\fBd2i_\f(BI\s-1TYPE\s0\fBPrivateKey\fR() and derivates thereof decode \s-1DER\s0 encoded \&\fB\f(BI\s-1TYPE\s0\fB\fR private key data organized in a type specific structure. .PP \&\fBd2i_\f(BI\s-1TYPE\s0\fBPublicKey\fR() and derivates thereof decode \s-1DER\s0 encoded \&\fB\f(BI\s-1TYPE\s0\fB\fR public key data organized in a type specific structure. .PP \&\fBd2i_\f(BI\s-1TYPE\s0\fBparams\fR() and derivates thereof decode \s-1DER\s0 encoded \fB\f(BI\s-1TYPE\s0\fB\fR key parameters organized in a type specific structure. .PP \&\fBd2i_\f(BI\s-1TYPE\s0\fB_PUBKEY\fR() and derivates thereof decode \s-1DER\s0 encoded \fB\f(BI\s-1TYPE\s0\fB\fR public key data organized in a \fBSubjectPublicKeyInfo\fR structure. .PP \&\fBi2d_\f(BI\s-1TYPE\s0\fBPrivateKey\fR() and derivates thereof encode the private key \&\fB\f(BI\s-1TYPE\s0\fB\fR data into a type specific \s-1DER\s0 encoded structure. .PP \&\fBi2d_\f(BI\s-1TYPE\s0\fBPublicKey\fR() and derivates thereof encode the public key \&\fB\f(BI\s-1TYPE\s0\fB\fR data into a type specific \s-1DER\s0 encoded structure. .PP \&\fBi2d_\f(BI\s-1TYPE\s0\fBparams\fR() and derivates thereof encode the \fB\f(BI\s-1TYPE\s0\fB\fR key parameters data into a type specific \s-1DER\s0 encoded structure. .PP \&\fBi2d_\f(BI\s-1TYPE\s0\fB_PUBKEY\fR() and derivates thereof encode the public key \&\fB\f(BI\s-1TYPE\s0\fB\fR data into a \s-1DER\s0 encoded \fBSubjectPublicKeyInfo\fR structure. .PP For example, \fBd2i_RSAPrivateKey()\fR and \fBd2i_RSAPublicKey()\fR expects the structure defined by PKCS#1. Similarly, \fBi2d_RSAPrivateKey()\fR and \fBi2d_RSAPublicKey()\fR produce \s-1DER\s0 encoded string organized according to PKCS#1. .SS "Migration" .IX Subsection "Migration" Migration from the diverse \fB\f(BI\s-1TYPE\s0\fB\fRs requires using corresponding new OpenSSL types. For all \fB\f(BI\s-1TYPE\s0\fB\fRs described here, the corresponding new type is \fB\s-1EVP_PKEY\s0\fR. The rest of this section assumes that this has been done, exactly how to do that is described elsewhere. .PP There are two migration paths: .IP "\(bu" 4 Replace b with \fBd2i_PrivateKey\fR\|(3), b with \fBd2i_PublicKey\fR\|(3), b with \fBd2i_KeyParams\fR\|(3), b with \fBd2i_PUBKEY\fR\|(3), b with \fBi2d_PrivateKey\fR\|(3), b with \fBi2d_PublicKey\fR\|(3), b with \fBi2d_KeyParams\fR\|(3), b with \fBi2d_PUBKEY\fR\|(3). A caveat is that \fBi2d_PrivateKey\fR\|(3) may output a \s-1DER\s0 encoded PKCS#8 outermost structure instead of the type specific structure, and that \&\fBd2i_PrivateKey\fR\|(3) recognises and unpacks a PKCS#8 structures. .IP "\(bu" 4 Use \s-1\fBOSSL_DECODER\s0\fR\|(3) and \s-1\fBOSSL_ENCODER\s0\fR\|(3). How to migrate is described below. All those descriptions assume that the key to be encoded is in the variable \fIpkey\fR. .PP \fIMigrating \f(BIi2d\fI functions to \f(BI\s-1OSSL_ENCODER\s0\fI\fR .IX Subsection "Migrating i2d functions to OSSL_ENCODER" .PP The exact \s-1\fBOSSL_ENCODER\s0\fR\|(3) output is driven by arguments rather than by function names. The sample code to get \s-1DER\s0 encoded output in a type specific structure is uniform, the only things that vary are the selection of what part of the \fB\s-1EVP_PKEY\s0\fR should be output, and the structure. The \&\fBi2d\fR functions names can therefore be translated into two variables, \&\fIselection\fR and \fIstructure\fR as follows: .IP "\fBi2d_\f(BI\s-1TYPE\s0\fBPrivateKey\fR() translates into:" 4 .IX Item "i2d_TYPEPrivateKey() translates into:" .Vb 2 \& int selection = EVP_PKEY_KEYPAIR; \& const char *structure = "type\-specific"; .Ve .IP "\fBi2d_\f(BI\s-1TYPE\s0\fBPublicKey\fR() translates into:" 4 .IX Item "i2d_TYPEPublicKey() translates into:" .Vb 2 \& int selection = EVP_PKEY_PUBLIC_KEY; \& const char *structure = "type\-specific"; .Ve .IP "\fBi2d_\f(BI\s-1TYPE\s0\fBparams\fR() translates into:" 4 .IX Item "i2d_TYPEparams() translates into:" .Vb 2 \& int selection = EVP_PKEY_PARAMETERS; \& const char *structure = "type\-specific"; .Ve .IP "\fBi2d_\f(BI\s-1TYPE\s0\fB_PUBKEY\fR() translates into:" 4 .IX Item "i2d_TYPE_PUBKEY() translates into:" .Vb 2 \& int selection = EVP_PKEY_PUBLIC_KEY; \& const char *structure = "SubjectPublicKeyInfo"; .Ve .PP The following sample code does the rest of the work: .PP .Vb 10 \& unsigned char *p = buffer; /* |buffer| is supplied by the caller */ \& size_t len = buffer_size; /* assumed be the size of |buffer| */ \& OSSL_ENCODER_CTX *ctx = \& OSSL_ENCODER_CTX_new_for_pkey(pkey, selection, "DER", structure, \& NULL, NULL); \& if (ctx == NULL) { \& /* fatal error handling */ \& } \& if (OSSL_ENCODER_CTX_get_num_encoders(ctx) == 0) { \& OSSL_ENCODER_CTX_free(ctx); \& /* non\-fatal error handling */ \& } \& if (!OSSL_ENCODER_to_data(ctx, &p, &len)) { \& OSSL_ENCODER_CTX_free(ctx); \& /* error handling */ \& } \& OSSL_ENCODER_CTX_free(ctx); .Ve .SH "NOTES" .IX Header "NOTES" The letters \fBi\fR and \fBd\fR in \fBi2d_\f(BI\s-1TYPE\s0\fB\fR() stand for \&\*(L"internal\*(R" (that is, an internal C structure) and \*(L"\s-1DER\*(R"\s0 respectively. So \fBi2d_\f(BI\s-1TYPE\s0\fB\fR() converts from internal to \s-1DER.\s0 .PP The functions can also understand \fB\s-1BER\s0\fR forms. .PP The actual \s-1TYPE\s0 structure passed to \fBi2d_\f(BI\s-1TYPE\s0\fB\fR() must be a valid populated \fB\f(BI\s-1TYPE\s0\fB\fR structure \*(-- it \fBcannot\fR simply be fed with an empty structure such as that returned by \fBTYPE_new()\fR. .PP The encoded data is in binary form and may contain embedded zeros. Therefore, any \s-1FILE\s0 pointers or BIOs should be opened in binary mode. Functions such as \fBstrlen()\fR will \fBnot\fR return the correct length of the encoded structure. .PP The ways that \fI*ppin\fR and \fI*ppout\fR are incremented after the operation can trap the unwary. See the \fB\s-1WARNINGS\s0\fR section in \fBd2i_X509\fR\|(3) for some common errors. The reason for this-auto increment behaviour is to reflect a typical usage of \s-1ASN1\s0 functions: after one structure is encoded or decoded another will be processed after it. .PP The following points about the data types might be useful: .IP "\fB\s-1DSA_PUBKEY\s0\fR" 4 .IX Item "DSA_PUBKEY" Represents a \s-1DSA\s0 public key using a \fBSubjectPublicKeyInfo\fR structure. .IP "\fBDSAPublicKey\fR, \fBDSAPrivateKey\fR" 4 .IX Item "DSAPublicKey, DSAPrivateKey" Use a non-standard OpenSSL format and should be avoided; use \fB\s-1DSA_PUBKEY\s0\fR, \&\fBPEM_write_PrivateKey\fR\|(3), or similar instead. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBd2i_\f(BI\s-1TYPE\s0\fB\fR(), \fBd2i_\f(BI\s-1TYPE\s0\fB_bio\fR() and \fBd2i_\f(BI\s-1TYPE\s0\fB_fp\fR() return a valid \&\fB\f(BI\s-1TYPE\s0\fB\fR structure or \s-1NULL\s0 if an error occurs. If the \*(L"reuse\*(R" capability has been used with a valid structure being passed in via \fIa\fR, then the object is freed in the event of error and \fI*a\fR is set to \s-1NULL.\s0 .PP \&\fBi2d_\f(BI\s-1TYPE\s0\fB\fR() returns the number of bytes successfully encoded or a negative value if an error occurs. .PP \&\fBi2d_\f(BI\s-1TYPE\s0\fB_bio\fR() and \fBi2d_\f(BI\s-1TYPE\s0\fB_fp\fR() return 1 for success and 0 if an error occurs. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\s-1\fBOSSL_ENCODER\s0\fR\|(3), \s-1\fBOSSL_DECODER\s0\fR\|(3), \&\fBd2i_PrivateKey\fR\|(3), \fBd2i_PublicKey\fR\|(3), \fBd2i_KeyParams\fR\|(3), \&\fBd2i_PUBKEY\fR\|(3), \&\fBi2d_PrivateKey\fR\|(3), \fBi2d_PublicKey\fR\|(3), \fBi2d_KeyParams\fR\|(3), \&\fBi2d_PUBKEY\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2020\-2023 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the Apache License 2.0 (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 .