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62dcd2aa17
Certificate Management Protocol (CMP, RFC 4210) extension to OpenSSL Also includes CRMF (RFC 4211) and HTTP transfer (RFC 6712). Adds the CMP and CRMF API to libcrypto and the "cmp" app to the CLI. Adds extensive documentation and tests. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com> (Merged from https://github.com/openssl/openssl/pull/11142)
654 lines
16 KiB
Plaintext
654 lines
16 KiB
Plaintext
=pod
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=head1 NAME
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d2i_ACCESS_DESCRIPTION,
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d2i_ADMISSIONS,
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d2i_ADMISSION_SYNTAX,
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d2i_ASIdOrRange,
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d2i_ASIdentifierChoice,
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d2i_ASIdentifiers,
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d2i_ASN1_BIT_STRING,
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d2i_ASN1_BMPSTRING,
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d2i_ASN1_ENUMERATED,
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d2i_ASN1_GENERALIZEDTIME,
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d2i_ASN1_GENERALSTRING,
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d2i_ASN1_IA5STRING,
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d2i_ASN1_INTEGER,
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d2i_ASN1_NULL,
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d2i_ASN1_OBJECT,
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d2i_ASN1_OCTET_STRING,
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d2i_ASN1_PRINTABLE,
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d2i_ASN1_PRINTABLESTRING,
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d2i_ASN1_SEQUENCE_ANY,
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d2i_ASN1_SET_ANY,
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d2i_ASN1_T61STRING,
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d2i_ASN1_TIME,
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d2i_ASN1_TYPE,
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d2i_ASN1_UINTEGER,
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d2i_ASN1_UNIVERSALSTRING,
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d2i_ASN1_UTCTIME,
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d2i_ASN1_UTF8STRING,
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d2i_ASN1_VISIBLESTRING,
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d2i_ASRange,
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d2i_AUTHORITY_INFO_ACCESS,
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d2i_AUTHORITY_KEYID,
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d2i_BASIC_CONSTRAINTS,
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d2i_CERTIFICATEPOLICIES,
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d2i_CMS_ContentInfo,
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d2i_CMS_ReceiptRequest,
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d2i_CMS_bio,
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d2i_CRL_DIST_POINTS,
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d2i_DHxparams,
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d2i_DIRECTORYSTRING,
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d2i_DISPLAYTEXT,
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d2i_DIST_POINT,
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d2i_DIST_POINT_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_DSA_SIG,
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d2i_DSAparams,
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d2i_ECDSA_SIG,
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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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d2i_EDIPARTYNAME,
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d2i_ESS_CERT_ID,
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d2i_ESS_CERT_ID_V2,
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d2i_ESS_ISSUER_SERIAL,
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d2i_ESS_SIGNING_CERT,
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d2i_ESS_SIGNING_CERT_V2,
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d2i_EXTENDED_KEY_USAGE,
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d2i_GENERAL_NAME,
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d2i_GENERAL_NAMES,
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d2i_IPAddressChoice,
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d2i_IPAddressFamily,
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d2i_IPAddressOrRange,
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d2i_IPAddressRange,
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d2i_ISSUING_DIST_POINT,
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d2i_NAMING_AUTHORITY,
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d2i_NETSCAPE_CERT_SEQUENCE,
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d2i_NETSCAPE_SPKAC,
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d2i_NETSCAPE_SPKI,
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d2i_NOTICEREF,
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d2i_OCSP_BASICRESP,
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d2i_OCSP_CERTID,
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d2i_OCSP_CERTSTATUS,
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d2i_OCSP_CRLID,
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d2i_OCSP_ONEREQ,
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d2i_OCSP_REQINFO,
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d2i_OCSP_REQUEST,
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d2i_OCSP_RESPBYTES,
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d2i_OCSP_RESPDATA,
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d2i_OCSP_RESPID,
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d2i_OCSP_RESPONSE,
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d2i_OCSP_REVOKEDINFO,
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d2i_OCSP_SERVICELOC,
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d2i_OCSP_SIGNATURE,
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d2i_OCSP_SINGLERESP,
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d2i_OSSL_CMP_MSG,
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d2i_OSSL_CMP_PKIHEADER,
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d2i_OSSL_CMP_PKISI,
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d2i_OSSL_CRMF_CERTID,
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d2i_OSSL_CRMF_CERTTEMPLATE,
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d2i_OSSL_CRMF_ENCRYPTEDVALUE,
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d2i_OSSL_CRMF_MSG,
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d2i_OSSL_CRMF_MSGS,
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d2i_OSSL_CRMF_PBMPARAMETER,
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d2i_OSSL_CRMF_PKIPUBLICATIONINFO,
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d2i_OSSL_CRMF_SINGLEPUBINFO,
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d2i_OTHERNAME,
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d2i_PBE2PARAM,
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d2i_PBEPARAM,
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d2i_PBKDF2PARAM,
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d2i_PKCS12,
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d2i_PKCS12_BAGS,
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d2i_PKCS12_MAC_DATA,
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d2i_PKCS12_SAFEBAG,
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d2i_PKCS12_bio,
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d2i_PKCS12_fp,
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d2i_PKCS7,
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d2i_PKCS7_DIGEST,
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d2i_PKCS7_ENCRYPT,
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d2i_PKCS7_ENC_CONTENT,
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d2i_PKCS7_ENVELOPE,
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d2i_PKCS7_ISSUER_AND_SERIAL,
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d2i_PKCS7_RECIP_INFO,
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d2i_PKCS7_SIGNED,
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d2i_PKCS7_SIGNER_INFO,
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d2i_PKCS7_SIGN_ENVELOPE,
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d2i_PKCS7_bio,
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d2i_PKCS7_fp,
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d2i_PKCS8_PRIV_KEY_INFO,
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d2i_PKCS8_PRIV_KEY_INFO_bio,
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d2i_PKCS8_PRIV_KEY_INFO_fp,
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d2i_PKCS8_bio,
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d2i_PKCS8_fp,
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d2i_PKEY_USAGE_PERIOD,
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d2i_POLICYINFO,
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d2i_POLICYQUALINFO,
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d2i_PROFESSION_INFO,
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d2i_PROXY_CERT_INFO_EXTENSION,
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d2i_PROXY_POLICY,
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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_OAEP_PARAMS,
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d2i_RSA_PSS_PARAMS,
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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_SCRYPT_PARAMS,
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d2i_SCT_LIST,
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d2i_SXNET,
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d2i_SXNETID,
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d2i_TS_ACCURACY,
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d2i_TS_MSG_IMPRINT,
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d2i_TS_MSG_IMPRINT_bio,
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d2i_TS_MSG_IMPRINT_fp,
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d2i_TS_REQ,
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d2i_TS_REQ_bio,
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d2i_TS_REQ_fp,
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d2i_TS_RESP,
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d2i_TS_RESP_bio,
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d2i_TS_RESP_fp,
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d2i_TS_STATUS_INFO,
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d2i_TS_TST_INFO,
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d2i_TS_TST_INFO_bio,
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d2i_TS_TST_INFO_fp,
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d2i_USERNOTICE,
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d2i_X509,
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d2i_X509_ALGOR,
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d2i_X509_ALGORS,
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d2i_X509_ATTRIBUTE,
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d2i_X509_CERT_AUX,
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d2i_X509_CINF,
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d2i_X509_CRL,
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d2i_X509_CRL_INFO,
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d2i_X509_CRL_bio,
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d2i_X509_CRL_fp,
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d2i_X509_EXTENSION,
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d2i_X509_EXTENSIONS,
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d2i_X509_NAME,
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d2i_X509_NAME_ENTRY,
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d2i_X509_PUBKEY,
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d2i_X509_PUBKEY_bio,
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d2i_X509_PUBKEY_fp,
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d2i_X509_REQ,
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d2i_X509_REQ_INFO,
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d2i_X509_REQ_bio,
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d2i_X509_REQ_fp,
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d2i_X509_REVOKED,
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d2i_X509_SIG,
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d2i_X509_VAL,
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i2d_ACCESS_DESCRIPTION,
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i2d_ADMISSIONS,
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i2d_ADMISSION_SYNTAX,
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i2d_ASIdOrRange,
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i2d_ASIdentifierChoice,
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i2d_ASIdentifiers,
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i2d_ASN1_BIT_STRING,
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i2d_ASN1_BMPSTRING,
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i2d_ASN1_ENUMERATED,
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i2d_ASN1_GENERALIZEDTIME,
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i2d_ASN1_GENERALSTRING,
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i2d_ASN1_IA5STRING,
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i2d_ASN1_INTEGER,
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i2d_ASN1_NULL,
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i2d_ASN1_OBJECT,
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i2d_ASN1_OCTET_STRING,
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i2d_ASN1_PRINTABLE,
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i2d_ASN1_PRINTABLESTRING,
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i2d_ASN1_SEQUENCE_ANY,
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i2d_ASN1_SET_ANY,
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i2d_ASN1_T61STRING,
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i2d_ASN1_TIME,
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i2d_ASN1_TYPE,
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i2d_ASN1_UNIVERSALSTRING,
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i2d_ASN1_UTCTIME,
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i2d_ASN1_UTF8STRING,
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i2d_ASN1_VISIBLESTRING,
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i2d_ASN1_bio_stream,
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i2d_ASRange,
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i2d_AUTHORITY_INFO_ACCESS,
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i2d_AUTHORITY_KEYID,
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i2d_BASIC_CONSTRAINTS,
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i2d_CERTIFICATEPOLICIES,
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i2d_CMS_ContentInfo,
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i2d_CMS_ReceiptRequest,
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i2d_CMS_bio,
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i2d_CRL_DIST_POINTS,
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i2d_DHxparams,
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i2d_DIRECTORYSTRING,
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i2d_DISPLAYTEXT,
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i2d_DIST_POINT,
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i2d_DIST_POINT_NAME,
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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_DSA_SIG,
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i2d_DSAparams,
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i2d_ECDSA_SIG,
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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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i2d_EDIPARTYNAME,
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i2d_ESS_CERT_ID,
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i2d_ESS_CERT_ID_V2,
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i2d_ESS_ISSUER_SERIAL,
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i2d_ESS_SIGNING_CERT,
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i2d_ESS_SIGNING_CERT_V2,
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i2d_EXTENDED_KEY_USAGE,
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i2d_GENERAL_NAME,
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i2d_GENERAL_NAMES,
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i2d_IPAddressChoice,
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i2d_IPAddressFamily,
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i2d_IPAddressOrRange,
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i2d_IPAddressRange,
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i2d_ISSUING_DIST_POINT,
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i2d_NAMING_AUTHORITY,
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i2d_NETSCAPE_CERT_SEQUENCE,
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i2d_NETSCAPE_SPKAC,
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i2d_NETSCAPE_SPKI,
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i2d_NOTICEREF,
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i2d_OCSP_BASICRESP,
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i2d_OCSP_CERTID,
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i2d_OCSP_CERTSTATUS,
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i2d_OCSP_CRLID,
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i2d_OCSP_ONEREQ,
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i2d_OCSP_REQINFO,
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i2d_OCSP_REQUEST,
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i2d_OCSP_RESPBYTES,
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i2d_OCSP_RESPDATA,
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i2d_OCSP_RESPID,
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i2d_OCSP_RESPONSE,
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i2d_OCSP_REVOKEDINFO,
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i2d_OCSP_SERVICELOC,
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i2d_OCSP_SIGNATURE,
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i2d_OCSP_SINGLERESP,
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i2d_OSSL_CMP_MSG,
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i2d_OSSL_CMP_PKIHEADER,
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i2d_OSSL_CMP_PKISI,
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i2d_OSSL_CRMF_CERTID,
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i2d_OSSL_CRMF_CERTTEMPLATE,
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i2d_OSSL_CRMF_ENCRYPTEDVALUE,
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i2d_OSSL_CRMF_MSG,
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i2d_OSSL_CRMF_MSGS,
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i2d_OSSL_CRMF_PBMPARAMETER,
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i2d_OSSL_CRMF_PKIPUBLICATIONINFO,
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i2d_OSSL_CRMF_SINGLEPUBINFO,
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i2d_OTHERNAME,
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i2d_PBE2PARAM,
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i2d_PBEPARAM,
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i2d_PBKDF2PARAM,
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i2d_PKCS12,
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i2d_PKCS12_BAGS,
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i2d_PKCS12_MAC_DATA,
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i2d_PKCS12_SAFEBAG,
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i2d_PKCS12_bio,
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i2d_PKCS12_fp,
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i2d_PKCS7,
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i2d_PKCS7_DIGEST,
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i2d_PKCS7_ENCRYPT,
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i2d_PKCS7_ENC_CONTENT,
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i2d_PKCS7_ENVELOPE,
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i2d_PKCS7_ISSUER_AND_SERIAL,
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i2d_PKCS7_NDEF,
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i2d_PKCS7_RECIP_INFO,
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i2d_PKCS7_SIGNED,
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i2d_PKCS7_SIGNER_INFO,
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i2d_PKCS7_SIGN_ENVELOPE,
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i2d_PKCS7_bio,
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i2d_PKCS7_fp,
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i2d_PKCS8PrivateKeyInfo_bio,
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i2d_PKCS8PrivateKeyInfo_fp,
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i2d_PKCS8_PRIV_KEY_INFO,
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i2d_PKCS8_PRIV_KEY_INFO_bio,
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i2d_PKCS8_PRIV_KEY_INFO_fp,
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i2d_PKCS8_bio,
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i2d_PKCS8_fp,
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i2d_PKEY_USAGE_PERIOD,
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i2d_POLICYINFO,
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i2d_POLICYQUALINFO,
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i2d_PROFESSION_INFO,
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i2d_PROXY_CERT_INFO_EXTENSION,
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i2d_PROXY_POLICY,
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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_OAEP_PARAMS,
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i2d_RSA_PSS_PARAMS,
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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_SCRYPT_PARAMS,
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i2d_SCT_LIST,
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i2d_SXNET,
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i2d_SXNETID,
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i2d_TS_ACCURACY,
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i2d_TS_MSG_IMPRINT,
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i2d_TS_MSG_IMPRINT_bio,
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i2d_TS_MSG_IMPRINT_fp,
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i2d_TS_REQ,
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i2d_TS_REQ_bio,
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i2d_TS_REQ_fp,
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i2d_TS_RESP,
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i2d_TS_RESP_bio,
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i2d_TS_RESP_fp,
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i2d_TS_STATUS_INFO,
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i2d_TS_TST_INFO,
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i2d_TS_TST_INFO_bio,
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i2d_TS_TST_INFO_fp,
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i2d_USERNOTICE,
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i2d_X509,
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i2d_X509_ALGOR,
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i2d_X509_ALGORS,
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i2d_X509_ATTRIBUTE,
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i2d_X509_CERT_AUX,
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i2d_X509_CINF,
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i2d_X509_CRL,
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i2d_X509_CRL_INFO,
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i2d_X509_CRL_bio,
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i2d_X509_CRL_fp,
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i2d_X509_EXTENSION,
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i2d_X509_EXTENSIONS,
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i2d_X509_NAME,
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i2d_X509_NAME_ENTRY,
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i2d_X509_PUBKEY,
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i2d_X509_PUBKEY_bio,
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i2d_X509_PUBKEY_fp,
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i2d_X509_REQ,
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i2d_X509_REQ_INFO,
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i2d_X509_REQ_bio,
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i2d_X509_REQ_fp,
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i2d_X509_REVOKED,
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i2d_X509_SIG,
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i2d_X509_VAL,
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- convert objects from/to ASN.1/DER representation
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=head1 SYNOPSIS
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=for openssl generic
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TYPE *d2i_TYPE(TYPE **a, unsigned char **ppin, long length);
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TYPE *d2i_TYPE_bio(BIO *bp, TYPE **a);
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TYPE *d2i_TYPE_fp(FILE *fp, TYPE **a);
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int i2d_TYPE(const TYPE *a, unsigned char **ppout);
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int i2d_TYPE(TYPE *a, unsigned char **ppout);
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int i2d_TYPE_fp(FILE *fp, const TYPE *a);
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int i2d_TYPE_fp(FILE *fp, TYPE *a);
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int i2d_TYPE_bio(BIO *bp, const TYPE *a);
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int i2d_TYPE_bio(BIO *bp, TYPE *a);
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=head1 DESCRIPTION
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In the description here, B<I<TYPE>> is used a placeholder
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for any of the OpenSSL datatypes, such as I<X509_CRL>.
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The function parameters I<ppin> and I<ppout> are generally
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either both named I<pp> in the headers, or I<in> and I<out>.
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These functions convert OpenSSL objects to and from their ASN.1/DER
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encoding. Unlike the C structures which can have pointers to sub-objects
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within, the DER is a serialized encoding, suitable for sending over the
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network, writing to a file, and so on.
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B<d2i_I<TYPE>>() attempts to decode I<len> bytes at I<*ppin>. If successful a
|
|
pointer to the B<I<TYPE>> structure is returned and I<*ppin> is incremented to
|
|
the byte following the parsed data. If I<a> is not NULL then a pointer
|
|
to the returned structure is also written to I<*a>. If an error occurred
|
|
then NULL is returned.
|
|
|
|
On a successful return, if I<*a> is not NULL then it is assumed that I<*a>
|
|
contains a valid B<I<TYPE>> structure and an attempt is made to reuse it. This
|
|
"reuse" capability is present for historical compatibility but its use is
|
|
B<strongly discouraged> (see BUGS below, and the discussion in the RETURN
|
|
VALUES section).
|
|
|
|
B<d2i_I<TYPE>_bio>() is similar to B<d2i_I<TYPE>>() except it attempts
|
|
to parse data from BIO I<bp>.
|
|
|
|
B<d2i_I<TYPE>_fp>() is similar to B<d2i_I<TYPE>>() except it attempts
|
|
to parse data from FILE pointer I<fp>.
|
|
|
|
B<i2d_I<TYPE>>() encodes the structure pointed to by I<a> into DER format.
|
|
If I<ppout> is not NULL, it writes the DER encoded data to the buffer
|
|
at I<*ppout>, and increments it to point after the data just written.
|
|
If the return value is negative an error occurred, otherwise it
|
|
returns the length of the encoded data.
|
|
|
|
If I<*ppout> is NULL memory will be allocated for a buffer and the encoded
|
|
data written to it. In this case I<*ppout> is not incremented and it points
|
|
to the start of the data just written.
|
|
|
|
B<i2d_I<TYPE>_bio>() is similar to B<i2d_I<TYPE>>() except it writes
|
|
the encoding of the structure I<a> to BIO I<bp> and it
|
|
returns 1 for success and 0 for failure.
|
|
|
|
B<i2d_I<TYPE>_fp>() is similar to B<i2d_I<TYPE>>() except it writes
|
|
the encoding of the structure I<a> to BIO I<bp> and it
|
|
returns 1 for success and 0 for failure.
|
|
|
|
These routines do not encrypt private keys and therefore offer no
|
|
security; use L<PEM_write_PrivateKey(3)> or similar for writing to files.
|
|
|
|
=head1 NOTES
|
|
|
|
The letters B<i> and B<d> in B<i2d_I<TYPE>>() stand for
|
|
"internal" (that is, an internal C structure) and "DER" respectively.
|
|
So B<i2d_I<TYPE>>() converts from internal to DER.
|
|
|
|
The functions can also understand B<BER> forms.
|
|
|
|
The actual TYPE structure passed to B<i2d_I<TYPE>>() must be a valid
|
|
populated B<I<TYPE>> structure -- it B<cannot> simply be fed with an
|
|
empty structure such as that returned by TYPE_new().
|
|
|
|
The encoded data is in binary form and may contain embedded zeros.
|
|
Therefore any FILE pointers or BIOs should be opened in binary mode.
|
|
Functions such as strlen() will B<not> return the correct length
|
|
of the encoded structure.
|
|
|
|
The ways that I<*ppin> and I<*ppout> are incremented after the operation
|
|
can trap the unwary. See the B<WARNINGS> section for some common
|
|
errors.
|
|
The reason for this-auto increment behaviour is to reflect a typical
|
|
usage of ASN1 functions: after one structure is encoded or decoded
|
|
another will be processed after it.
|
|
|
|
The following points about the data types might be useful:
|
|
|
|
=over 4
|
|
|
|
=item B<ASN1_OBJECT>
|
|
|
|
Represents an ASN1 OBJECT IDENTIFIER.
|
|
|
|
=item B<DHparams>
|
|
|
|
Represents a PKCS#3 DH parameters structure.
|
|
|
|
=item B<DHxparams>
|
|
|
|
Represents an ANSI X9.42 DH parameters structure.
|
|
|
|
=item B<DSA_PUBKEY>
|
|
|
|
Represents a DSA public key using a B<SubjectPublicKeyInfo> structure.
|
|
|
|
=item B<DSAPublicKey>, B<DSAPrivateKey>
|
|
|
|
Use a non-standard OpenSSL format and should be avoided; use B<DSA_PUBKEY>,
|
|
L<PEM_write_PrivateKey(3)>, or similar instead.
|
|
|
|
=item B<ECDSA_SIG>
|
|
|
|
Represents an ECDSA signature.
|
|
|
|
=item B<RSAPublicKey>
|
|
|
|
Represents a PKCS#1 RSA public key structure.
|
|
|
|
=item B<X509_ALGOR>
|
|
|
|
Represents an B<AlgorithmIdentifier> structure as used in IETF RFC 6960 and
|
|
elsewhere.
|
|
|
|
=item B<X509_Name>
|
|
|
|
Represents a B<Name> type as used for subject and issuer names in
|
|
IETF RFC 6960 and elsewhere.
|
|
|
|
=item B<X509_REQ>
|
|
|
|
Represents a PKCS#10 certificate request.
|
|
|
|
=item B<X509_SIG>
|
|
|
|
Represents the B<DigestInfo> structure defined in PKCS#1 and PKCS#7.
|
|
|
|
=back
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
B<d2i_I<TYPE>>(), B<d2i_I<TYPE>_bio>() and B<d2i_I<TYPE>_fp>() return a valid
|
|
B<I<TYPE>> structure or NULL if an error occurs. If the "reuse" capability has
|
|
been used with a valid structure being passed in via I<a>, then the object is
|
|
freed in the event of error and I<*a> is set to NULL.
|
|
|
|
B<i2d_I<TYPE>>() returns the number of bytes successfully encoded or a negative
|
|
value if an error occurs.
|
|
|
|
B<i2d_I<TYPE>_bio>() and B<i2d_I<TYPE>_fp>() return 1 for success and 0 if an
|
|
error occurs.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
Allocate and encode the DER encoding of an X509 structure:
|
|
|
|
int len;
|
|
unsigned char *buf;
|
|
|
|
buf = NULL;
|
|
len = i2d_X509(x, &buf);
|
|
if (len < 0)
|
|
/* error */
|
|
|
|
Attempt to decode a buffer:
|
|
|
|
X509 *x;
|
|
unsigned char *buf, *p;
|
|
int len;
|
|
|
|
/* Set up buf and len to point to the input buffer. */
|
|
p = buf;
|
|
x = d2i_X509(NULL, &p, len);
|
|
if (x == NULL)
|
|
/* error */
|
|
|
|
Alternative technique:
|
|
|
|
X509 *x;
|
|
unsigned char *buf, *p;
|
|
int len;
|
|
|
|
/* Set up buf and len to point to the input buffer. */
|
|
p = buf;
|
|
x = NULL;
|
|
|
|
if (d2i_X509(&x, &p, len) == NULL)
|
|
/* error */
|
|
|
|
=head1 WARNINGS
|
|
|
|
Using a temporary variable is mandatory. A common
|
|
mistake is to attempt to use a buffer directly as follows:
|
|
|
|
int len;
|
|
unsigned char *buf;
|
|
|
|
len = i2d_X509(x, NULL);
|
|
buf = OPENSSL_malloc(len);
|
|
...
|
|
i2d_X509(x, &buf);
|
|
...
|
|
OPENSSL_free(buf);
|
|
|
|
This code will result in I<buf> apparently containing garbage because
|
|
it was incremented after the call to point after the data just written.
|
|
Also I<buf> will no longer contain the pointer allocated by OPENSSL_malloc()
|
|
and the subsequent call to OPENSSL_free() is likely to crash.
|
|
|
|
Another trap to avoid is misuse of the I<a> argument to B<d2i_I<TYPE>>():
|
|
|
|
X509 *x;
|
|
|
|
if (d2i_X509(&x, &p, len) == NULL)
|
|
/* error */
|
|
|
|
This will probably crash somewhere in d2i_X509(). The reason for this
|
|
is that the variable I<x> is uninitialized and an attempt will be made to
|
|
interpret its (invalid) value as an B<X509> structure, typically causing
|
|
a segmentation violation. If I<x> is set to NULL first then this will not
|
|
happen.
|
|
|
|
=head1 BUGS
|
|
|
|
In some versions of OpenSSL the "reuse" behaviour of B<d2i_I<TYPE>>() when
|
|
I<*a> is valid is broken and some parts of the reused structure may
|
|
persist if they are not present in the new one. Additionally, in versions of
|
|
OpenSSL prior to 1.1.0, when the "reuse" behaviour is used and an error occurs
|
|
the behaviour is inconsistent. Some functions behaved as described here, while
|
|
some did not free I<*a> on error and did not set I<*a> to NULL.
|
|
|
|
As a result of the above issues the "reuse" behaviour is strongly discouraged.
|
|
|
|
B<i2d_I<TYPE>>() will not return an error in many versions of OpenSSL,
|
|
if mandatory fields are not initialized due to a programming error
|
|
then the encoded structure may contain invalid data or omit the
|
|
fields entirely and will not be parsed by B<d2i_I<TYPE>>(). This may be
|
|
fixed in future so code should not assume that B<i2d_I<TYPE>>() will
|
|
always succeed.
|
|
|
|
Any function which encodes a structure (B<i2d_I<TYPE>>(),
|
|
B<i2d_I<TYPE>>() or B<i2d_I<TYPE>>()) may return a stale encoding if the
|
|
structure has been modified after deserialization or previous
|
|
serialization. This is because some objects cache the encoding for
|
|
efficiency reasons.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 1998-2018 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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|