mirror of
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320 lines
10 KiB
Plaintext
320 lines
10 KiB
Plaintext
=pod
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=begin comment
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Any deprecated keypair/params d2i or i2d functions are collected on this page.
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=end comment
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=head1 NAME
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d2i_DSAPrivateKey,
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d2i_DSAPrivateKey_bio,
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d2i_DSAPrivateKey_fp,
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d2i_DSAPublicKey,
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d2i_DSA_PUBKEY,
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d2i_DSA_PUBKEY_bio,
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d2i_DSA_PUBKEY_fp,
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d2i_DSAparams,
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d2i_RSAPrivateKey,
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d2i_RSAPrivateKey_bio,
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d2i_RSAPrivateKey_fp,
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d2i_RSAPublicKey,
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d2i_RSAPublicKey_bio,
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d2i_RSAPublicKey_fp,
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d2i_RSA_PUBKEY,
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d2i_RSA_PUBKEY_bio,
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d2i_RSA_PUBKEY_fp,
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d2i_DHparams,
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d2i_DHparams_bio,
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d2i_DHparams_fp,
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d2i_ECPKParameters,
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d2i_ECParameters,
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d2i_ECPrivateKey,
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d2i_ECPrivateKey_bio,
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d2i_ECPrivateKey_fp,
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d2i_EC_PUBKEY,
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d2i_EC_PUBKEY_bio,
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d2i_EC_PUBKEY_fp,
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i2d_RSAPrivateKey,
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i2d_RSAPrivateKey_bio,
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i2d_RSAPrivateKey_fp,
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i2d_RSAPublicKey,
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i2d_RSAPublicKey_bio,
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i2d_RSAPublicKey_fp,
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i2d_RSA_PUBKEY,
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i2d_RSA_PUBKEY_bio,
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i2d_RSA_PUBKEY_fp,
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i2d_DHparams,
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i2d_DHparams_bio,
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i2d_DHparams_fp,
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i2d_DSAPrivateKey,
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i2d_DSAPrivateKey_bio,
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i2d_DSAPrivateKey_fp,
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i2d_DSAPublicKey,
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i2d_DSA_PUBKEY,
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i2d_DSA_PUBKEY_bio,
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i2d_DSA_PUBKEY_fp,
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i2d_DSAparams,
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i2d_ECPKParameters,
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i2d_ECParameters,
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i2d_ECPrivateKey,
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i2d_ECPrivateKey_bio,
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i2d_ECPrivateKey_fp,
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i2d_EC_PUBKEY,
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i2d_EC_PUBKEY_bio,
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i2d_EC_PUBKEY_fp
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- DEPRECATED
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=head1 SYNOPSIS
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=for openssl generic
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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see L<openssl_user_macros(7)>:
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TYPE *d2i_TYPEPrivateKey(TYPE **a, const unsigned char **ppin, long length);
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TYPE *d2i_TYPEPrivateKey_bio(BIO *bp, TYPE **a);
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TYPE *d2i_TYPEPrivateKey_fp(FILE *fp, TYPE **a);
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TYPE *d2i_TYPEPublicKey(TYPE **a, const unsigned char **ppin, long length);
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TYPE *d2i_TYPEPublicKey_bio(BIO *bp, TYPE **a);
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TYPE *d2i_TYPEPublicKey_fp(FILE *fp, TYPE **a);
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TYPE *d2i_TYPEparams(TYPE **a, const unsigned char **ppin, long length);
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TYPE *d2i_TYPEparams_bio(BIO *bp, TYPE **a);
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TYPE *d2i_TYPEparams_fp(FILE *fp, TYPE **a);
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TYPE *d2i_TYPE_PUBKEY(TYPE **a, const unsigned char **ppin, long length);
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TYPE *d2i_TYPE_PUBKEY_bio(BIO *bp, TYPE **a);
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TYPE *d2i_TYPE_PUBKEY_fp(FILE *fp, TYPE **a);
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int i2d_TYPEPrivateKey(const TYPE *a, unsigned char **ppout);
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int i2d_TYPEPrivateKey(TYPE *a, unsigned char **ppout);
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int i2d_TYPEPrivateKey_fp(FILE *fp, const TYPE *a);
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int i2d_TYPEPrivateKey_fp(FILE *fp, TYPE *a);
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int i2d_TYPEPrivateKey_bio(BIO *bp, const TYPE *a);
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int i2d_TYPEPrivateKey_bio(BIO *bp, TYPE *a);
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int i2d_TYPEPublicKey(const TYPE *a, unsigned char **ppout);
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int i2d_TYPEPublicKey(TYPE *a, unsigned char **ppout);
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int i2d_TYPEPublicKey_fp(FILE *fp, const TYPE *a);
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int i2d_TYPEPublicKey_fp(FILE *fp, TYPE *a);
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int i2d_TYPEPublicKey_bio(BIO *bp, const TYPE *a);
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int i2d_TYPEPublicKey_bio(BIO *bp, TYPE *a);
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int i2d_TYPEparams(const TYPE *a, unsigned char **ppout);
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int i2d_TYPEparams(TYPE *a, unsigned char **ppout);
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int i2d_TYPEparams_fp(FILE *fp, const TYPE *a);
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int i2d_TYPEparams_fp(FILE *fp, TYPE *a);
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int i2d_TYPEparams_bio(BIO *bp, const TYPE *a);
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int i2d_TYPEparams_bio(BIO *bp, TYPE *a);
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int i2d_TYPE_PUBKEY(const TYPE *a, unsigned char **ppout);
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int i2d_TYPE_PUBKEY(TYPE *a, unsigned char **ppout);
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int i2d_TYPE_PUBKEY_fp(FILE *fp, const TYPE *a);
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int i2d_TYPE_PUBKEY_fp(FILE *fp, TYPE *a);
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int i2d_TYPE_PUBKEY_bio(BIO *bp, const TYPE *a);
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int i2d_TYPE_PUBKEY_bio(BIO *bp, TYPE *a);
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=head1 DESCRIPTION
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All functions described here are deprecated. Please use L<OSSL_DECODER(3)>
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instead of the B<d2i> functions and L<OSSL_ENCODER(3)> instead of the B<i2d>
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functions. See L</Migration> below.
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In the description here, B<I<TYPE>> is used a placeholder for any of the
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OpenSSL datatypes, such as B<RSA>.
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The function parameters I<ppin> and I<ppout> are generally either both named
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I<pp> in the headers, or I<in> and I<out>.
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All the functions here behave the way that's described in L<d2i_X509(3)>.
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Please note that not all functions in the synopsis are available for all key
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types. For example, there are no d2i_RSAparams() or i2d_RSAparams(),
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because the PKCS#1 B<RSA> structure doesn't include any key parameters.
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B<d2i_I<TYPE>PrivateKey>() and derivates thereof decode DER encoded
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B<I<TYPE>> private key data organized in a type specific structure.
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B<d2i_I<TYPE>PublicKey>() and derivates thereof decode DER encoded
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B<I<TYPE>> public key data organized in a type specific structure.
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B<d2i_I<TYPE>params>() and derivates thereof decode DER encoded B<I<TYPE>>
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key parameters organized in a type specific structure.
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B<d2i_I<TYPE>_PUBKEY>() and derivates thereof decode DER encoded B<I<TYPE>>
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public key data organized in a B<SubjectPublicKeyInfo> structure.
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B<i2d_I<TYPE>PrivateKey>() and derivates thereof encode the private key
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B<I<TYPE>> data into a type specific DER encoded structure.
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B<i2d_I<TYPE>PublicKey>() and derivates thereof encode the public key
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B<I<TYPE>> data into a type specific DER encoded structure.
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B<i2d_I<TYPE>params>() and derivates thereof encode the B<I<TYPE>> key
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parameters data into a type specific DER encoded structure.
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B<i2d_I<TYPE>_PUBKEY>() and derivates thereof encode the public key
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B<I<TYPE>> data into a DER encoded B<SubjectPublicKeyInfo> structure.
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For example, d2i_RSAPrivateKey() and d2i_RSAPublicKey() expects the
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structure defined by PKCS#1.
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Similarly, i2d_RSAPrivateKey() and i2d_RSAPublicKey() produce DER encoded
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string organized according to PKCS#1.
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=head2 Migration
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Migration from the diverse B<I<TYPE>>s requires using corresponding new
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OpenSSL types. For all B<I<TYPE>>s described here, the corresponding new
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type is B<EVP_PKEY>. The rest of this section assumes that this has been
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done, exactly how to do that is described elsewhere.
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There are two migration paths:
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=over 4
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=item *
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Replace
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b<d2i_I<TYPE>PrivateKey()> with L<d2i_PrivateKey(3)>,
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b<d2i_I<TYPE>PublicKey()> with L<d2i_PublicKey(3)>,
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b<d2i_I<TYPE>params()> with L<d2i_KeyParams(3)>,
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b<d2i_I<TYPE>_PUBKEY()> with L<d2i_PUBKEY(3)>,
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b<i2d_I<TYPE>PrivateKey()> with L<i2d_PrivateKey(3)>,
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b<i2d_I<TYPE>PublicKey()> with L<i2d_PublicKey(3)>,
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b<i2d_I<TYPE>params()> with L<i2d_KeyParams(3)>,
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b<i2d_I<TYPE>_PUBKEY()> with L<i2d_PUBKEY(3)>.
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A caveat is that L<i2d_PrivateKey(3)> may output a DER encoded PKCS#8
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outermost structure instead of the type specific structure, and that
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L<d2i_PrivateKey(3)> recognises and unpacks a PKCS#8 structures.
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=item *
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Use L<OSSL_DECODER(3)> and L<OSSL_ENCODER(3)>. How to migrate is described
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below. All those descriptions assume that the key to be encoded is in the
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variable I<pkey>.
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=back
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=head3 Migrating B<i2d> functions to B<OSSL_ENCODER>
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The exact L<OSSL_ENCODER(3)> output is driven by arguments rather than by
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function names. The sample code to get DER encoded output in a type
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specific structure is uniform, the only things that vary are the selection
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of what part of the B<EVP_PKEY> should be output, and the structure. The
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B<i2d> functions names can therefore be translated into two variables,
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I<selection> and I<structure> as follows:
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=over 4
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=item B<i2d_I<TYPE>PrivateKey>() translates into:
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int selection = EVP_PKEY_PRIVATE_KEY;
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const char *structure = "type-specific";
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=item B<i2d_I<TYPE>PublicKey>() translates into:
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int selection = EVP_PKEY_PUBLIC_KEY;
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const char *structure = "type-specific";
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=item B<i2d_I<TYPE>params>() translates into:
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int selection = EVP_PKEY_PARAMETERS;
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const char *structure = "type-specific";
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=item B<i2d_I<TYPE>_PUBKEY>() translates into:
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int selection = EVP_PKEY_PUBLIC_KEY;
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const char *structure = "SubjectPublicKeyInfo";
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=back
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The following sample code does the rest of the work:
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unsigned char *p = buffer; /* |buffer| is supplied by the caller */
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size_t len = buffer_size; /* assumed be the size of |buffer| */
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OSSL_ENCODER_CTX *ctx =
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OSSL_ENCODER_CTX_new_for_pkey(pkey, selection, "DER", structure,
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NULL, NULL);
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if (ctx == NULL) {
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/* fatal error handling */
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}
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if (OSSL_ENCODER_CTX_get_num_encoders(ctx) == 0) {
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OSSL_ENCODER_CTX_free(ctx);
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/* non-fatal error handling */
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}
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if (!OSSL_ENCODER_to_data(ctx, &p, &len)) {
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OSSL_ENCODER_CTX_free(ctx);
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/* error handling */
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}
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OSSL_ENCODER_CTX_free(ctx);
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=for comment TODO: a similar section on OSSL_DECODER is to be added
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=head1 NOTES
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The letters B<i> and B<d> in B<i2d_I<TYPE>>() stand for
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"internal" (that is, an internal C structure) and "DER" respectively.
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So B<i2d_I<TYPE>>() converts from internal to DER.
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The functions can also understand B<BER> forms.
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The actual TYPE structure passed to B<i2d_I<TYPE>>() must be a valid
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populated B<I<TYPE>> structure -- it B<cannot> simply be fed with an
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empty structure such as that returned by TYPE_new().
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The encoded data is in binary form and may contain embedded zeros.
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Therefore, any FILE pointers or BIOs should be opened in binary mode.
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Functions such as strlen() will B<not> return the correct length
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of the encoded structure.
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The ways that I<*ppin> and I<*ppout> are incremented after the operation
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can trap the unwary. See the B<WARNINGS> section in L<d2i_X509(3)> for some
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common errors.
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The reason for this-auto increment behaviour is to reflect a typical
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usage of ASN1 functions: after one structure is encoded or decoded
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another will be processed after it.
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The following points about the data types might be useful:
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=over 4
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=item B<DSA_PUBKEY>
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Represents a DSA public key using a B<SubjectPublicKeyInfo> structure.
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=item B<DSAPublicKey>, B<DSAPrivateKey>
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Use a non-standard OpenSSL format and should be avoided; use B<DSA_PUBKEY>,
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L<PEM_write_PrivateKey(3)>, or similar instead.
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=back
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=head1 RETURN VALUES
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B<d2i_I<TYPE>>(), B<d2i_I<TYPE>_bio>() and B<d2i_I<TYPE>_fp>() return a valid
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B<I<TYPE>> structure or NULL if an error occurs. If the "reuse" capability has
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been used with a valid structure being passed in via I<a>, then the object is
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freed in the event of error and I<*a> is set to NULL.
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B<i2d_I<TYPE>>() returns the number of bytes successfully encoded or a negative
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value if an error occurs.
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B<i2d_I<TYPE>_bio>() and B<i2d_I<TYPE>_fp>() return 1 for success and 0 if an
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error occurs.
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=head1 SEE ALSO
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L<OSSL_ENCODER(3)>, L<OSSL_DECODER(3)>,
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L<d2i_PrivateKey(3)>, L<d2i_PublicKey(3)>, L<d2i_KeyParams(3)>,
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L<d2i_PUBKEY(3)>,
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L<i2d_PrivateKey(3)>, L<i2d_PublicKey(3)>, L<i2d_KeyParams(3)>,
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L<i2d_PUBKEY(3)>
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=head1 COPYRIGHT
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Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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