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#ifndef H_RPMPGP #define H_RPMPGP /** \ingroup rpmpgp * \file rpmio/rpmpgp.h * * OpenPGP constants and structures from RFC-2440. * * Text from RFC-2440 in comments is * Copyright (C) The Internet Society (1998). All Rights Reserved. */ #include <string.h> #include <stdio.h> #include <stdlib.h> #include <rpm/rpmtypes.h> #include <rpm/rpmstring.h> #ifdef __cplusplus extern "C" { #endif /** \ingroup rpmpgp */ typedef struct DIGEST_CTX_s * DIGEST_CTX; typedef struct rpmDigestBundle_s * rpmDigestBundle; /** \ingroup rpmpgp */ typedef struct pgpDig_s * pgpDig; /** \ingroup rpmpgp */ typedef struct pgpDigParams_s * pgpDigParams; typedef uint8_t pgpKeyID_t[8]; typedef uint8_t pgpTime_t[4]; /** \ingroup rpmpgp * 4.3. Packet Tags * * The packet tag denotes what type of packet the body holds. Note that * old format headers can only have tags less than 16, whereas new * format headers can have tags as great as 63. */ typedef enum pgpTag_e { PGPTAG_RESERVED = 0, /*!< Reserved/Invalid */ PGPTAG_PUBLIC_SESSION_KEY = 1, /*!< Public-Key Encrypted Session Key */ PGPTAG_SIGNATURE = 2, /*!< Signature */ PGPTAG_SYMMETRIC_SESSION_KEY= 3, /*!< Symmetric-Key Encrypted Session Key*/ PGPTAG_ONEPASS_SIGNATURE = 4, /*!< One-Pass Signature */ PGPTAG_SECRET_KEY = 5, /*!< Secret Key */ PGPTAG_PUBLIC_KEY = 6, /*!< Public Key */ PGPTAG_SECRET_SUBKEY = 7, /*!< Secret Subkey */ PGPTAG_COMPRESSED_DATA = 8, /*!< Compressed Data */ PGPTAG_SYMMETRIC_DATA = 9, /*!< Symmetrically Encrypted Data */ PGPTAG_MARKER = 10, /*!< Marker */ PGPTAG_LITERAL_DATA = 11, /*!< Literal Data */ PGPTAG_TRUST = 12, /*!< Trust */ PGPTAG_USER_ID = 13, /*!< User ID */ PGPTAG_PUBLIC_SUBKEY = 14, /*!< Public Subkey */ PGPTAG_COMMENT_OLD = 16, /*!< Comment (from OpenPGP draft) */ PGPTAG_PHOTOID = 17, /*!< PGP's photo ID */ PGPTAG_ENCRYPTED_MDC = 18, /*!< Integrity protected encrypted data */ PGPTAG_MDC = 19, /*!< Manipulaion detection code packet */ PGPTAG_PRIVATE_60 = 60, /*!< Private or Experimental Values */ PGPTAG_COMMENT = 61, /*!< Comment */ PGPTAG_PRIVATE_62 = 62, /*!< Private or Experimental Values */ PGPTAG_CONTROL = 63 /*!< Control (GPG) */ } pgpTag; /** \ingroup rpmpgp * 5.1. Public-Key Encrypted Session Key Packets (Tag 1) * * A Public-Key Encrypted Session Key packet holds the session key used * to encrypt a message. Zero or more Encrypted Session Key packets * (either Public-Key or Symmetric-Key) may precede a Symmetrically * Encrypted Data Packet, which holds an encrypted message. The message * is encrypted with the session key, and the session key is itself * encrypted and stored in the Encrypted Session Key packet(s). The * Symmetrically Encrypted Data Packet is preceded by one Public-Key * Encrypted Session Key packet for each OpenPGP key to which the * message is encrypted. The recipient of the message finds a session * key that is encrypted to their public key, decrypts the session key, * and then uses the session key to decrypt the message. * * The body of this packet consists of: * - A one-octet number giving the version number of the packet type. * The currently defined value for packet version is 3. An * implementation should accept, but not generate a version of 2, * which is equivalent to V3 in all other respects. * - An eight-octet number that gives the key ID of the public key * that the session key is encrypted to. * - A one-octet number giving the public key algorithm used. * - A string of octets that is the encrypted session key. This string * takes up the remainder of the packet, and its contents are * dependent on the public key algorithm used. * * Algorithm Specific Fields for RSA encryption * - multiprecision integer (MPI) of RSA encrypted value m**e mod n. * * Algorithm Specific Fields for Elgamal encryption: * - MPI of Elgamal (Diffie-Hellman) value g**k mod p. * - MPI of Elgamal (Diffie-Hellman) value m * y**k mod p. */ typedef struct pgpPktPubkey_s { uint8_t version; /*!< version number (generate 3, accept 2). */ pgpKeyID_t keyid; /*!< key ID of the public key for session key. */ uint8_t algo; /*!< public key algorithm used. */ } pgpPktPubkey; /** \ingroup rpmpgp * 5.2.1. Signature Types * * There are a number of possible meanings for a signature, which are * specified in a signature type octet in any given signature. */ typedef enum pgpSigType_e { PGPSIGTYPE_BINARY = 0x00, /*!< Binary document */ PGPSIGTYPE_TEXT = 0x01, /*!< Canonical text document */ PGPSIGTYPE_STANDALONE = 0x02, /*!< Standalone */ PGPSIGTYPE_GENERIC_CERT = 0x10, /*!< Generic certification of a User ID & Public Key */ PGPSIGTYPE_PERSONA_CERT = 0x11, /*!< Persona certification of a User ID & Public Key */ PGPSIGTYPE_CASUAL_CERT = 0x12, /*!< Casual certification of a User ID & Public Key */ PGPSIGTYPE_POSITIVE_CERT = 0x13, /*!< Positive certification of a User ID & Public Key */ PGPSIGTYPE_SUBKEY_BINDING = 0x18, /*!< Subkey Binding */ PGPSIGTYPE_SIGNED_KEY = 0x1F, /*!< Signature directly on a key */ PGPSIGTYPE_KEY_REVOKE = 0x20, /*!< Key revocation */ PGPSIGTYPE_SUBKEY_REVOKE = 0x28, /*!< Subkey revocation */ PGPSIGTYPE_CERT_REVOKE = 0x30, /*!< Certification revocation */ PGPSIGTYPE_TIMESTAMP = 0x40 /*!< Timestamp */ } pgpSigType; /** \ingroup rpmpgp * 9.1. Public Key Algorithms * \verbatim ID Algorithm -- --------- 1 - RSA (Encrypt or Sign) 2 - RSA Encrypt-Only 3 - RSA Sign-Only 16 - Elgamal (Encrypt-Only), see [ELGAMAL] 17 - DSA (Digital Signature Standard) 18 - Reserved for Elliptic Curve 19 - Reserved for ECDSA 20 - Elgamal (Encrypt or Sign) 21 - Reserved for Diffie-Hellman (X9.42, as defined for IETF-S/MIME) 100 to 110 - Private/Experimental algorithm. \endverbatim * * Implementations MUST implement DSA for signatures, and Elgamal for * encryption. Implementations SHOULD implement RSA keys. * Implementations MAY implement any other algorithm. */ typedef enum pgpPubkeyAlgo_e { PGPPUBKEYALGO_RSA = 1, /*!< RSA */ PGPPUBKEYALGO_RSA_ENCRYPT = 2, /*!< RSA(Encrypt-Only) */ PGPPUBKEYALGO_RSA_SIGN = 3, /*!< RSA(Sign-Only) */ PGPPUBKEYALGO_ELGAMAL_ENCRYPT = 16, /*!< Elgamal(Encrypt-Only) */ PGPPUBKEYALGO_DSA = 17, /*!< DSA */ PGPPUBKEYALGO_EC = 18, /*!< Elliptic Curve */ PGPPUBKEYALGO_ECDSA = 19, /*!< ECDSA */ PGPPUBKEYALGO_ELGAMAL = 20, /*!< Elgamal */ PGPPUBKEYALGO_DH = 21 /*!< Diffie-Hellman (X9.42) */ } pgpPubkeyAlgo; /** \ingroup rpmpgp * 9.2. Symmetric Key Algorithms * \verbatim ID Algorithm -- --------- 0 - Plaintext or unencrypted data 1 - IDEA [IDEA] 2 - Triple-DES (DES-EDE, as per spec - 168 bit key derived from 192) 3 - CAST5 (128 bit key, as per RFC 2144) 4 - Blowfish (128 bit key, 16 rounds) [BLOWFISH] 5 - SAFER-SK128 (13 rounds) [SAFER] 6 - Reserved for DES/SK 7 - Reserved for AES with 128-bit key 8 - Reserved for AES with 192-bit key 9 - Reserved for AES with 256-bit key 100 to 110 - Private/Experimental algorithm. \endverbatim * * Implementations MUST implement Triple-DES. Implementations SHOULD * implement IDEA and CAST5. Implementations MAY implement any other * algorithm. */ typedef enum pgpSymkeyAlgo_e { PGPSYMKEYALGO_PLAINTEXT = 0, /*!< Plaintext */ PGPSYMKEYALGO_IDEA = 1, /*!< IDEA */ PGPSYMKEYALGO_TRIPLE_DES = 2, /*!< 3DES */ PGPSYMKEYALGO_CAST5 = 3, /*!< CAST5 */ PGPSYMKEYALGO_BLOWFISH = 4, /*!< BLOWFISH */ PGPSYMKEYALGO_SAFER = 5, /*!< SAFER */ PGPSYMKEYALGO_DES_SK = 6, /*!< DES/SK */ PGPSYMKEYALGO_AES_128 = 7, /*!< AES(128-bit key) */ PGPSYMKEYALGO_AES_192 = 8, /*!< AES(192-bit key) */ PGPSYMKEYALGO_AES_256 = 9, /*!< AES(256-bit key) */ PGPSYMKEYALGO_TWOFISH = 10, /*!< TWOFISH(256-bit key) */ PGPSYMKEYALGO_NOENCRYPT = 110 /*!< no encryption */ } pgpSymkeyAlgo; /** \ingroup rpmpgp * 9.3. Compression Algorithms * \verbatim ID Algorithm -- --------- 0 - Uncompressed 1 - ZIP (RFC 1951) 2 - ZLIB (RFC 1950) 100 to 110 - Private/Experimental algorithm. \endverbatim * * Implementations MUST implement uncompressed data. Implementations * SHOULD implement ZIP. Implementations MAY implement ZLIB. */ typedef enum pgpCompressAlgo_e { PGPCOMPRESSALGO_NONE = 0, /*!< Uncompressed */ PGPCOMPRESSALGO_ZIP = 1, /*!< ZIP */ PGPCOMPRESSALGO_ZLIB = 2, /*!< ZLIB */ PGPCOMPRESSALGO_BZIP2 = 3 /*!< BZIP2 */ } pgpCompressAlgo; /** \ingroup rpmpgp * 9.4. Hash Algorithms * \verbatim ID Algorithm Text Name -- --------- ---- ---- 1 - MD5 "MD5" 2 - SHA-1 "SHA1" 3 - RIPE-MD/160 "RIPEMD160" 4 - Reserved for double-width SHA (experimental) 5 - MD2 "MD2" 6 - Reserved for TIGER/192 "TIGER192" 7 - Reserved for HAVAL (5 pass, 160-bit) "HAVAL-5-160" 100 to 110 - Private/Experimental algorithm. \endverbatim * * Implementations MUST implement SHA-1. Implementations SHOULD * implement MD5. * @todo Add SHA256. */ typedef enum pgpHashAlgo_e { PGPHASHALGO_MD5 = 1, /*!< MD5 */ PGPHASHALGO_SHA1 = 2, /*!< SHA1 */ PGPHASHALGO_RIPEMD160 = 3, /*!< RIPEMD160 */ PGPHASHALGO_MD2 = 5, /*!< MD2 */ PGPHASHALGO_TIGER192 = 6, /*!< TIGER192 */ PGPHASHALGO_HAVAL_5_160 = 7, /*!< HAVAL-5-160 */ PGPHASHALGO_SHA256 = 8, /*!< SHA256 */ PGPHASHALGO_SHA384 = 9, /*!< SHA384 */ PGPHASHALGO_SHA512 = 10, /*!< SHA512 */ PGPHASHALGO_SHA224 = 11, /*!< SHA224 */ } pgpHashAlgo; /** \ingroup rpmpgp * 5.2.2. Version 3 Signature Packet Format * * The body of a version 3 Signature Packet contains: * - One-octet version number (3). * - One-octet length of following hashed material. MUST be 5. * - One-octet signature type. * - Four-octet creation time. * - Eight-octet key ID of signer. * - One-octet public key algorithm. * - One-octet hash algorithm. * - Two-octet field holding left 16 bits of signed hash value. * - One or more multi-precision integers comprising the signature. * * Algorithm Specific Fields for RSA signatures: * - multiprecision integer (MPI) of RSA signature value m**d. * * Algorithm Specific Fields for DSA signatures: * - MPI of DSA value r. * - MPI of DSA value s. */ typedef struct pgpPktSigV3_s { uint8_t version; /*!< version number (3). */ uint8_t hashlen; /*!< length of following hashed material. MUST be 5. */ uint8_t sigtype; /*!< signature type. */ pgpTime_t time; /*!< 4 byte creation time. */ pgpKeyID_t signid; /*!< key ID of signer. */ uint8_t pubkey_algo; /*!< public key algorithm. */ uint8_t hash_algo; /*!< hash algorithm. */ uint8_t signhash16[2]; /*!< left 16 bits of signed hash value. */ } * pgpPktSigV3; /** \ingroup rpmpgp * 5.2.3. Version 4 Signature Packet Format * * The body of a version 4 Signature Packet contains: * - One-octet version number (4). * - One-octet signature type. * - One-octet public key algorithm. * - One-octet hash algorithm. * - Two-octet scalar octet count for following hashed subpacket * data. Note that this is the length in octets of all of the hashed * subpackets; a pointer incremented by this number will skip over * the hashed subpackets. * - Hashed subpacket data. (zero or more subpackets) * - Two-octet scalar octet count for following unhashed subpacket * data. Note that this is the length in octets of all of the * unhashed subpackets; a pointer incremented by this number will * skip over the unhashed subpackets. * - Unhashed subpacket data. (zero or more subpackets) * - Two-octet field holding left 16 bits of signed hash value. * - One or more multi-precision integers comprising the signature. */ typedef struct pgpPktSigV4_s { uint8_t version; /*!< version number (4). */ uint8_t sigtype; /*!< signature type. */ uint8_t pubkey_algo; /*!< public key algorithm. */ uint8_t hash_algo; /*!< hash algorithm. */ uint8_t hashlen[2]; /*!< length of following hashed material. */ } * pgpPktSigV4; /** \ingroup rpmpgp * 5.2.3.1. Signature Subpacket Specification * * The subpacket fields consist of zero or more signature subpackets. * Each set of subpackets is preceded by a two-octet scalar count of the * length of the set of subpackets. * * Each subpacket consists of a subpacket header and a body. The header * consists of: * - the subpacket length (1, 2, or 5 octets) * - the subpacket type (1 octet) * and is followed by the subpacket specific data. * * The length includes the type octet but not this length. Its format is * similar to the "new" format packet header lengths, but cannot have * partial body lengths. That is: \verbatim if the 1st octet < 192, then lengthOfLength = 1 subpacketLen = 1st_octet if the 1st octet >= 192 and < 255, then lengthOfLength = 2 subpacketLen = ((1st_octet - 192) << 8) + (2nd_octet) + 192 if the 1st octet = 255, then lengthOfLength = 5 subpacket length = [four-octet scalar starting at 2nd_octet] \endverbatim * * The value of the subpacket type octet may be: * \verbatim 2 = signature creation time 3 = signature expiration time 4 = exportable certification 5 = trust signature 6 = regular expression 7 = revocable 9 = key expiration time 10 = placeholder for backward compatibility 11 = preferred symmetric algorithms 12 = revocation key 16 = issuer key ID 20 = notation data 21 = preferred hash algorithms 22 = preferred compression algorithms 23 = key server preferences 24 = preferred key server 25 = primary user id 26 = policy URL 27 = key flags 28 = signer's user id 29 = reason for revocation 100 to 110 = internal or user-defined \endverbatim * * An implementation SHOULD ignore any subpacket of a type that it does * not recognize. * * Bit 7 of the subpacket type is the "critical" bit. If set, it * denotes that the subpacket is one that is critical for the evaluator * of the signature to recognize. If a subpacket is encountered that is * marked critical but is unknown to the evaluating software, the * evaluator SHOULD consider the signature to be in error. */ typedef enum pgpSubType_e { PGPSUBTYPE_NONE = 0, /*!< none */ PGPSUBTYPE_SIG_CREATE_TIME = 2, /*!< signature creation time */ PGPSUBTYPE_SIG_EXPIRE_TIME = 3, /*!< signature expiration time */ PGPSUBTYPE_EXPORTABLE_CERT = 4, /*!< exportable certification */ PGPSUBTYPE_TRUST_SIG = 5, /*!< trust signature */ PGPSUBTYPE_REGEX = 6, /*!< regular expression */ PGPSUBTYPE_REVOCABLE = 7, /*!< revocable */ PGPSUBTYPE_KEY_EXPIRE_TIME = 9, /*!< key expiration time */ PGPSUBTYPE_ARR = 10, /*!< additional recipient request */ PGPSUBTYPE_PREFER_SYMKEY = 11, /*!< preferred symmetric algorithms */ PGPSUBTYPE_REVOKE_KEY = 12, /*!< revocation key */ PGPSUBTYPE_ISSUER_KEYID = 16, /*!< issuer key ID */ PGPSUBTYPE_NOTATION = 20, /*!< notation data */ PGPSUBTYPE_PREFER_HASH = 21, /*!< preferred hash algorithms */ PGPSUBTYPE_PREFER_COMPRESS = 22, /*!< preferred compression algorithms */ PGPSUBTYPE_KEYSERVER_PREFERS= 23, /*!< key server preferences */ PGPSUBTYPE_PREFER_KEYSERVER = 24, /*!< preferred key server */ PGPSUBTYPE_PRIMARY_USERID = 25, /*!< primary user id */ PGPSUBTYPE_POLICY_URL = 26, /*!< policy URL */ PGPSUBTYPE_KEY_FLAGS = 27, /*!< key flags */ PGPSUBTYPE_SIGNER_USERID = 28, /*!< signer's user id */ PGPSUBTYPE_REVOKE_REASON = 29, /*!< reason for revocation */ PGPSUBTYPE_FEATURES = 30, /*!< feature flags (gpg) */ PGPSUBTYPE_EMBEDDED_SIG = 32, /*!< embedded signature (gpg) */ PGPSUBTYPE_INTERNAL_100 = 100, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_101 = 101, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_102 = 102, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_103 = 103, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_104 = 104, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_105 = 105, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_106 = 106, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_107 = 107, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_108 = 108, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_109 = 109, /*!< internal or user-defined */ PGPSUBTYPE_INTERNAL_110 = 110, /*!< internal or user-defined */ PGPSUBTYPE_CRITICAL = 128 /*!< critical subpacket marker */ } pgpSubType; /** \ingroup rpmpgp * 5.2. Signature Packet (Tag 2) * * A signature packet describes a binding between some public key and * some data. The most common signatures are a signature of a file or a * block of text, and a signature that is a certification of a user ID. * * Two versions of signature packets are defined. Version 3 provides * basic signature information, while version 4 provides an expandable * format with subpackets that can specify more information about the * signature. PGP 2.6.x only accepts version 3 signatures. * * Implementations MUST accept V3 signatures. Implementations SHOULD * generate V4 signatures. Implementations MAY generate a V3 signature * that can be verified by PGP 2.6.x. * * Note that if an implementation is creating an encrypted and signed * message that is encrypted to a V3 key, it is reasonable to create a * V3 signature. */ typedef union pgpPktSig_u { struct pgpPktSigV3_s v3; struct pgpPktSigV4_s v4; } * pgpPktSig; /** * 5.3. Symmetric-Key Encrypted Session-Key Packets (Tag 3) * * The Symmetric-Key Encrypted Session Key packet holds the symmetric- * key encryption of a session key used to encrypt a message. Zero or * more Encrypted Session Key packets and/or Symmetric-Key Encrypted * Session Key packets may precede a Symmetrically Encrypted Data Packet * that holds an encrypted message. The message is encrypted with a * session key, and the session key is itself encrypted and stored in * the Encrypted Session Key packet or the Symmetric-Key Encrypted * Session Key packet. * * If the Symmetrically Encrypted Data Packet is preceded by one or more * Symmetric-Key Encrypted Session Key packets, each specifies a * passphrase that may be used to decrypt the message. This allows a * message to be encrypted to a number of public keys, and also to one * or more pass phrases. This packet type is new, and is not generated * by PGP 2.x or PGP 5.0. * * The body of this packet consists of: * - A one-octet version number. The only currently defined version * is 4. * - A one-octet number describing the symmetric algorithm used. * - A string-to-key (S2K) specifier, length as defined above. * - Optionally, the encrypted session key itself, which is decrypted * with the string-to-key object. * */ typedef struct pgpPktSymkey_s { uint8_t version; /*!< version number (4). */ uint8_t symkey_algo; uint8_t s2k[1]; } pgpPktSymkey; /** \ingroup rpmpgp * 5.4. One-Pass Signature Packets (Tag 4) * * The One-Pass Signature packet precedes the signed data and contains * enough information to allow the receiver to begin calculating any * hashes needed to verify the signature. It allows the Signature * Packet to be placed at the end of the message, so that the signer can * compute the entire signed message in one pass. * * A One-Pass Signature does not interoperate with PGP 2.6.x or earlier. * * The body of this packet consists of: * - A one-octet version number. The current version is 3. * - A one-octet signature type. Signature types are described in * section 5.2.1. * - A one-octet number describing the hash algorithm used. * - A one-octet number describing the public key algorithm used. * - An eight-octet number holding the key ID of the signing key. * - A one-octet number holding a flag showing whether the signature * is nested. A zero value indicates that the next packet is * another One-Pass Signature packet that describes another * signature to be applied to the same message data. * * Note that if a message contains more than one one-pass signature, * then the signature packets bracket the message; that is, the first * signature packet after the message corresponds to the last one-pass * packet and the final signature packet corresponds to the first one- * pass packet. */ typedef struct pgpPktOnepass_s { uint8_t version; /*!< version number (3). */ uint8_t sigtype; /*!< signature type. */ uint8_t hash_algo; /*!< hash algorithm. */ uint8_t pubkey_algo; /*!< public key algorithm. */ pgpKeyID_t signid; /*!< key ID of signer. */ uint8_t nested; } * pgpPktOnepass; /** \ingroup rpmpgp * 5.5.1. Key Packet Variants * * 5.5.1.1. Public Key Packet (Tag 6) * * A Public Key packet starts a series of packets that forms an OpenPGP * key (sometimes called an OpenPGP certificate). * * 5.5.1.2. Public Subkey Packet (Tag 14) * * A Public Subkey packet (tag 14) has exactly the same format as a * Public Key packet, but denotes a subkey. One or more subkeys may be * associated with a top-level key. By convention, the top-level key * provides signature services, and the subkeys provide encryption * services. * * Note: in PGP 2.6.x, tag 14 was intended to indicate a comment packet. * This tag was selected for reuse because no previous version of PGP * ever emitted comment packets but they did properly ignore them. * Public Subkey packets are ignored by PGP 2.6.x and do not cause it to * fail, providing a limited degree of backward compatibility. * * 5.5.1.3. Secret Key Packet (Tag 5) * * A Secret Key packet contains all the information that is found in a * Public Key packet, including the public key material, but also * includes the secret key material after all the public key fields. * * 5.5.1.4. Secret Subkey Packet (Tag 7) * * A Secret Subkey packet (tag 7) is the subkey analog of the Secret Key * packet, and has exactly the same format. * * 5.5.2. Public Key Packet Formats * * There are two versions of key-material packets. Version 3 packets * were first generated by PGP 2.6. Version 2 packets are identical in * format to Version 3 packets, but are generated by PGP 2.5 or before. * V2 packets are deprecated and they MUST NOT be generated. PGP 5.0 * introduced version 4 packets, with new fields and semantics. PGP * 2.6.x will not accept key-material packets with versions greater than * 3. * * OpenPGP implementations SHOULD create keys with version 4 format. An * implementation MAY generate a V3 key to ensure interoperability with * old software; note, however, that V4 keys correct some security * deficiencies in V3 keys. These deficiencies are described below. An * implementation MUST NOT create a V3 key with a public key algorithm * other than RSA. * * A version 3 public key or public subkey packet contains: * - A one-octet version number (3). * - A four-octet number denoting the time that the key was created. * - A two-octet number denoting the time in days that this key is * valid. If this number is zero, then it does not expire. * - A one-octet number denoting the public key algorithm of this key * - A series of multi-precision integers comprising the key * material: * - a multiprecision integer (MPI) of RSA public modulus n; * - an MPI of RSA public encryption exponent e. * * V3 keys SHOULD only be used for backward compatibility because of * three weaknesses in them. First, it is relatively easy to construct a * V3 key that has the same key ID as any other key because the key ID * is simply the low 64 bits of the public modulus. Secondly, because * the fingerprint of a V3 key hashes the key material, but not its * length, which increases the opportunity for fingerprint collisions. * Third, there are minor weaknesses in the MD5 hash algorithm that make * developers prefer other algorithms. See below for a fuller discussion * of key IDs and fingerprints. * */ typedef struct pgpPktKeyV3_s { uint8_t version; /*!< version number (3). */ pgpTime_t time; /*!< time that the key was created. */ uint8_t valid[2]; /*!< time in days that this key is valid. */ uint8_t pubkey_algo; /*!< public key algorithm. */ } * pgpPktKeyV3; /** \ingroup rpmpgp * The version 4 format is similar to the version 3 format except for * the absence of a validity period. This has been moved to the * signature packet. In addition, fingerprints of version 4 keys are * calculated differently from version 3 keys, as described in section * "Enhanced Key Formats." * * A version 4 packet contains: * - A one-octet version number (4). * - A four-octet number denoting the time that the key was created. * - A one-octet number denoting the public key algorithm of this key * - A series of multi-precision integers comprising the key * material. This algorithm-specific portion is: * * Algorithm Specific Fields for RSA public keys: * - multiprecision integer (MPI) of RSA public modulus n; * - MPI of RSA public encryption exponent e. * * Algorithm Specific Fields for DSA public keys: * - MPI of DSA prime p; * - MPI of DSA group order q (q is a prime divisor of p-1); * - MPI of DSA group generator g; * - MPI of DSA public key value y (= g**x where x is secret). * * Algorithm Specific Fields for Elgamal public keys: * - MPI of Elgamal prime p; * - MPI of Elgamal group generator g; * - MPI of Elgamal public key value y (= g**x where x is * secret). * */ typedef struct pgpPktKeyV4_s { uint8_t version; /*!< version number (4). */ pgpTime_t time; /*!< time that the key was created. */ uint8_t pubkey_algo; /*!< public key algorithm. */ } * pgpPktKeyV4; /** \ingroup rpmpgp * 5.5.3. Secret Key Packet Formats * * The Secret Key and Secret Subkey packets contain all the data of the * Public Key and Public Subkey packets, with additional algorithm- * specific secret key data appended, in encrypted form. * * The packet contains: * - A Public Key or Public Subkey packet, as described above * - One octet indicating string-to-key usage conventions. 0 * indicates that the secret key data is not encrypted. 255 * indicates that a string-to-key specifier is being given. Any * other value is a symmetric-key encryption algorithm specifier. * - [Optional] If string-to-key usage octet was 255, a one-octet * symmetric encryption algorithm. * - [Optional] If string-to-key usage octet was 255, a string-to-key * specifier. The length of the string-to-key specifier is implied * by its type, as described above. * - [Optional] If secret data is encrypted, eight-octet Initial * Vector (IV). * - Encrypted multi-precision integers comprising the secret key * data. These algorithm-specific fields are as described below. * - Two-octet checksum of the plaintext of the algorithm-specific * portion (sum of all octets, mod 65536). * * Algorithm Specific Fields for RSA secret keys: * - multiprecision integer (MPI) of RSA secret exponent d. * - MPI of RSA secret prime value p. * - MPI of RSA secret prime value q (p < q). * - MPI of u, the multiplicative inverse of p, mod q. * * Algorithm Specific Fields for DSA secret keys: * - MPI of DSA secret exponent x. * * Algorithm Specific Fields for Elgamal secret keys: * - MPI of Elgamal secret exponent x. * * Secret MPI values can be encrypted using a passphrase. If a string- * to-key specifier is given, that describes the algorithm for * converting the passphrase to a key, else a simple MD5 hash of the * passphrase is used. Implementations SHOULD use a string-to-key * specifier; the simple hash is for backward compatibility. The cipher * for encrypting the MPIs is specified in the secret key packet. * * Encryption/decryption of the secret data is done in CFB mode using * the key created from the passphrase and the Initial Vector from the * packet. A different mode is used with V3 keys (which are only RSA) * than with other key formats. With V3 keys, the MPI bit count prefix * (i.e., the first two octets) is not encrypted. Only the MPI non- * prefix data is encrypted. Furthermore, the CFB state is * resynchronized at the beginning of each new MPI value, so that the * CFB block boundary is aligned with the start of the MPI data. * * With V4 keys, a simpler method is used. All secret MPI values are * encrypted in CFB mode, including the MPI bitcount prefix. * * The 16-bit checksum that follows the algorithm-specific portion is * the algebraic sum, mod 65536, of the plaintext of all the algorithm- * specific octets (including MPI prefix and data). With V3 keys, the * checksum is stored in the clear. With V4 keys, the checksum is * encrypted like the algorithm-specific data. This value is used to * check that the passphrase was correct. * */ typedef union pgpPktKey_u { struct pgpPktKeyV3_s v3; struct pgpPktKeyV4_s v4; } pgpPktKey; /* \ingroup rpmpgp * 5.6. Compressed Data Packet (Tag 8) * * The Compressed Data packet contains compressed data. Typically, this * packet is found as the contents of an encrypted packet, or following * a Signature or One-Pass Signature packet, and contains literal data * packets. * * The body of this packet consists of: * - One octet that gives the algorithm used to compress the packet. * - The remainder of the packet is compressed data. * * A Compressed Data Packet's body contains an block that compresses * some set of packets. See section "Packet Composition" for details on * how messages are formed. * * ZIP-compressed packets are compressed with raw RFC 1951 DEFLATE * blocks. Note that PGP V2.6 uses 13 bits of compression. If an * implementation uses more bits of compression, PGP V2.6 cannot * decompress it. * * ZLIB-compressed packets are compressed with RFC 1950 ZLIB-style * blocks. */ typedef struct pgpPktCdata_s { uint8_t compressalgo; uint8_t data[1]; } pgpPktCdata; /* \ingroup rpmpgp * 5.7. Symmetrically Encrypted Data Packet (Tag 9) * * The Symmetrically Encrypted Data packet contains data encrypted with * a symmetric-key algorithm. When it has been decrypted, it will * typically contain other packets (often literal data packets or * compressed data packets). * * The body of this packet consists of: * - Encrypted data, the output of the selected symmetric-key cipher * operating in PGP's variant of Cipher Feedback (CFB) mode. * * The symmetric cipher used may be specified in an Public-Key or * Symmetric-Key Encrypted Session Key packet that precedes the * Symmetrically Encrypted Data Packet. In that case, the cipher * algorithm octet is prefixed to the session key before it is * encrypted. If no packets of these types precede the encrypted data, * the IDEA algorithm is used with the session key calculated as the MD5 * hash of the passphrase. * * The data is encrypted in CFB mode, with a CFB shift size equal to the * cipher's block size. The Initial Vector (IV) is specified as all * zeros. Instead of using an IV, OpenPGP prefixes a 10-octet string to * the data before it is encrypted. The first eight octets are random, * and the 9th and 10th octets are copies of the 7th and 8th octets, * respectively. After encrypting the first 10 octets, the CFB state is * resynchronized if the cipher block size is 8 octets or less. The * last 8 octets of ciphertext are passed through the cipher and the * block boundary is reset. * * The repetition of 16 bits in the 80 bits of random data prefixed to * the message allows the receiver to immediately check whether the * session key is incorrect. */ typedef struct pgpPktEdata_s { uint8_t data[1]; } pgpPktEdata; /* \ingroup rpmpgp * 5.8. Marker Packet (Obsolete Literal Packet) (Tag 10) * * An experimental version of PGP used this packet as the Literal * packet, but no released version of PGP generated Literal packets with * this tag. With PGP 5.x, this packet has been re-assigned and is * reserved for use as the Marker packet. * * The body of this packet consists of: * - The three octets 0x50, 0x47, 0x50 (which spell "PGP" in UTF-8). * * Such a packet MUST be ignored when received. It may be placed at the * beginning of a message that uses features not available in PGP 2.6.x * in order to cause that version to report that newer software is * necessary to process the message. */ /* \ingroup rpmpgp * 5.9. Literal Data Packet (Tag 11) * * A Literal Data packet contains the body of a message; data that is * not to be further interpreted. * * The body of this packet consists of: * - A one-octet field that describes how the data is formatted. * * If it is a 'b' (0x62), then the literal packet contains binary data. * If it is a 't' (0x74), then it contains text data, and thus may need * line ends converted to local form, or other text-mode changes. RFC * 1991 also defined a value of 'l' as a 'local' mode for machine-local * conversions. This use is now deprecated. * - File name as a string (one-octet length, followed by file name), * if the encrypted data should be saved as a file. * * If the special name "_CONSOLE" is used, the message is considered to * be "for your eyes only". This advises that the message data is * unusually sensitive, and the receiving program should process it more * carefully, perhaps avoiding storing the received data to disk, for * example. * - A four-octet number that indicates the modification date of the * file, or the creation time of the packet, or a zero that * indicates the present time. * - The remainder of the packet is literal data. * * Text data is stored with <CR><LF> text endings (i.e. network-normal * line endings). These should be converted to native line endings by * the receiving software. */ typedef struct pgpPktLdata_s { uint8_t format; uint8_t filenamelen; uint8_t filename[1]; } pgpPktLdata; /* \ingroup rpmpgp * 5.10. Trust Packet (Tag 12) * * The Trust packet is used only within keyrings and is not normally * exported. Trust packets contain data that record the user's * specifications of which key holders are trustworthy introducers, * along with other information that implementing software uses for * trust information. * * Trust packets SHOULD NOT be emitted to output streams that are * transferred to other users, and they SHOULD be ignored on any input * other than local keyring files. */ typedef struct pgpPktTrust_s { uint8_t flag; } pgpPktTrust; /* \ingroup rpmpgp * 5.11. User ID Packet (Tag 13) * * A User ID packet consists of data that is intended to represent the * name and email address of the key holder. By convention, it includes * an RFC 822 mail name, but there are no restrictions on its content. * The packet length in the header specifies the length of the user id. * If it is text, it is encoded in UTF-8. * */ typedef struct pgpPktUid_s { uint8_t userid[1]; } pgpPktUid; /** \ingroup rpmpgp */ union pgpPktPre_u { pgpPktPubkey pubkey; /*!< 5.1. Public-Key Encrypted Session Key */ pgpPktSig sig; /*!< 5.2. Signature */ pgpPktSymkey symkey; /*!< 5.3. Symmetric-Key Encrypted Session-Key */ pgpPktOnepass onepass; /*!< 5.4. One-Pass Signature */ pgpPktKey key; /*!< 5.5. Key Material */ pgpPktCdata cdata; /*!< 5.6. Compressed Data */ pgpPktEdata edata; /*!< 5.7. Symmetrically Encrypted Data */ /*!< 5.8. Marker (obsolete) */ pgpPktLdata ldata; /*!< 5.9. Literal Data */ pgpPktTrust tdata; /*!< 5.10. Trust */ pgpPktUid uid; /*!< 5.11. User ID */ }; /** \ingroup rpmpgp */ typedef enum pgpArmor_e { PGPARMOR_ERR_CRC_CHECK = -7, PGPARMOR_ERR_BODY_DECODE = -6, PGPARMOR_ERR_CRC_DECODE = -5, PGPARMOR_ERR_NO_END_PGP = -4, PGPARMOR_ERR_UNKNOWN_PREAMBLE_TAG = -3, PGPARMOR_ERR_UNKNOWN_ARMOR_TYPE = -2, PGPARMOR_ERR_NO_BEGIN_PGP = -1, #define PGPARMOR_ERROR PGPARMOR_ERR_NO_BEGIN_PGP PGPARMOR_NONE = 0, PGPARMOR_MESSAGE = 1, /*!< MESSAGE */ PGPARMOR_PUBKEY = 2, /*!< PUBLIC KEY BLOCK */ PGPARMOR_SIGNATURE = 3, /*!< SIGNATURE */ PGPARMOR_SIGNED_MESSAGE = 4, /*!< SIGNED MESSAGE */ PGPARMOR_FILE = 5, /*!< ARMORED FILE */ PGPARMOR_PRIVKEY = 6, /*!< PRIVATE KEY BLOCK */ PGPARMOR_SECKEY = 7 /*!< SECRET KEY BLOCK */ } pgpArmor; /** \ingroup rpmpgp */ typedef enum pgpArmorKey_e { PGPARMORKEY_VERSION = 1, /*!< Version: */ PGPARMORKEY_COMMENT = 2, /*!< Comment: */ PGPARMORKEY_MESSAGEID = 3, /*!< MessageID: */ PGPARMORKEY_HASH = 4, /*!< Hash: */ PGPARMORKEY_CHARSET = 5 /*!< Charset: */ } pgpArmorKey; typedef enum pgpValType_e { PGPVAL_TAG = 1, PGPVAL_ARMORBLOCK = 2, PGPVAL_ARMORKEY = 3, PGPVAL_SIGTYPE = 4, PGPVAL_SUBTYPE = 5, PGPVAL_PUBKEYALGO = 6, PGPVAL_SYMKEYALGO = 7, PGPVAL_COMPRESSALGO = 8, PGPVAL_HASHALGO = 9, PGPVAL_SERVERPREFS = 10, } pgpValType; /** \ingroup rpmpgp * Bit(s) to control digest operation. */ enum rpmDigestFlags_e { RPMDIGEST_NONE = 0 }; typedef rpmFlags rpmDigestFlags; /** \ingroup rpmpgp * Return string representation of am OpenPGP value. * @param type type of value * @param val byte value to lookup * @return string value of byte */ const char * pgpValString(pgpValType type, uint8_t val); /** \ingroup rpmpgp * Return (native-endian) integer from big-endian representation. * @param s pointer to big-endian integer * @param nbytes no. of bytes * @return native-endian integer */ static inline unsigned int pgpGrab(const uint8_t *s, size_t nbytes) { size_t i = 0; size_t nb = (nbytes <= sizeof(i) ? nbytes : sizeof(i)); while (nb--) i = (i << 8) | *s++; return i; } /** \ingroup rpmpgp * Return hex formatted representation of bytes. * @param p bytes * @param plen no. of bytes * @return hex formatted string (malloc'ed) */ char * pgpHexStr(const uint8_t *p, size_t plen); /** \ingroup rpmpgp * Calculate OpenPGP public key fingerprint. * @todo V3 non-RSA public keys not implemented. * @param pkt OpenPGP packet (i.e. PGPTAG_PUBLIC_KEY) * @param pktlen OpenPGP packet length (no. of bytes) * @retval keyid public key fingerprint * @return 0 on success, else -1 */ int pgpPubkeyFingerprint(const uint8_t * pkt, size_t pktlen, pgpKeyID_t keyid); /** \ingroup rpmpgp * Extract OpenPGP public key fingerprint from base64 encoded packet. * @todo V3 non-RSA public keys not implemented. * @param b64pkt base64 encoded openpgp packet * @retval keyid public key fingerprint * @return 8 (no. of bytes) on success, < 0 on error */ int pgpExtractPubkeyFingerprint(const char * b64pkt, pgpKeyID_t keyid); /** \ingroup rpmpgp * Parse a OpenPGP packet(s). * @param pkts OpenPGP packet(s) * @param pktlen OpenPGP packet(s) length (no. of bytes) * @param pkttype Expected packet type (signature/key) or 0 for any * @retval ret signature/pubkey packet parameters on success (alloced) * @return -1 on error, 0 on success */ int pgpPrtParams(const uint8_t *pkts, size_t pktlen, unsigned int pkttype, pgpDigParams * ret); /** \ingroup rpmpgp * Print/parse a OpenPGP packet(s). * @param pkts OpenPGP packet(s) * @param pktlen OpenPGP packet(s) length (no. of bytes) * @retval dig parsed output of signature/pubkey packet parameters * @param printing should packets be printed? * @return -1 on error, 0 on success */ int pgpPrtPkts(const uint8_t *pkts, size_t pktlen, pgpDig dig, int printing); /** \ingroup rpmpgp * Parse armored OpenPGP packets from a file. * @param fn file name * @retval pkt dearmored OpenPGP packet(s) (malloced) * @retval pktlen dearmored OpenPGP packet(s) length in bytes * @return type of armor found */ pgpArmor pgpReadPkts(const char * fn, uint8_t ** pkt, size_t * pktlen); /** \ingroup rpmpgp * Parse armored OpenPGP packets from memory. * @param armor armored OpenPGP packet string * @retval pkt dearmored OpenPGP packet(s) (malloced) * @retval pktlen dearmored OpenPGP packet(s) length in bytes * @return type of armor found */ pgpArmor pgpParsePkts(const char *armor, uint8_t ** pkt, size_t * pktlen); /** \ingroup rpmpgp * Wrap a OpenPGP packets in ascii armor for transport. * @param atype type of armor * @param s binary pkt data * @param ns binary pkt data length * @return formatted string */ char * pgpArmorWrap(int atype, const unsigned char * s, size_t ns); /** \ingroup rpmpgp * Create a container for parsed OpenPGP packet(s). * @return container */ pgpDig pgpNewDig(void); /** \ingroup rpmpgp * Release (malloc'd) data from container. * @param dig container */ void pgpCleanDig(pgpDig dig); /** \ingroup rpmpgp * Destroy a container for parsed OpenPGP packet(s). * @param dig container * @return NULL always */ pgpDig pgpFreeDig(pgpDig dig); /** \ingroup rpmpgp * Retrieve parameters for parsed OpenPGP packet(s). * @param dig container * @param pkttype type of params to retrieve (signature / pubkey) * @return pointer to OpenPGP parameters, NULL on error/not found */ pgpDigParams pgpDigGetParams(pgpDig dig, unsigned int pkttype); /** \ingroup rpmpgp * Compare OpenPGP packet parameters * param p1 1st parameter container * param p2 2nd parameter container * return 1 if the parameters differ, 0 otherwise */ int pgpDigParamsCmp(pgpDigParams p1, pgpDigParams p2); /** \ingroup rpmpgp * Retrieve OpenPGP algorithm parameters * param digp parameter container * param algotype PGPVAL_HASHALGO / PGPVAL_PUBKEYALGO * return algorithm value, 0 on error */ unsigned int pgpDigParamsAlgo(pgpDigParams digp, unsigned int algotype); /** \ingroup rpmpgp * Destroy parsed OpenPGP packet parameter(s). * @param digp parameter container * @return NULL always */ pgpDigParams pgpDigParamsFree(pgpDigParams digp); /** \ingroup rpmpgp * Verify a PGP signature. * @param key public key * @param sig signature * @param hashctx digest context * @return RPMRC_OK on success */ rpmRC pgpVerifySignature(pgpDigParams key, pgpDigParams sig, DIGEST_CTX hashctx); /** \ingroup rpmpgp * Verify a PGP signature. * @deprecated use pgpVerifySignature() instead * * @param dig container * @param hashctx digest context * @return RPMRC_OK on success */ rpmRC pgpVerifySig(pgpDig dig, DIGEST_CTX hashctx); /** \ingroup rpmpgp * Return a string identification of a PGP signature/pubkey. * @param digp signature/pubkey container * @return string describing the item and parameters */ char *pgpIdentItem(pgpDigParams digp); /** \ingroup rpmpgp * Perform cryptography initialization. * It must be called before any cryptography can be used within rpm. * It's not normally necessary to call it directly as it's called in * general rpm initialization routines. * @return 0 on success, -1 on failure */ int rpmInitCrypto(void); /** \ingroup rpmpgp * Shutdown cryptography */ int rpmFreeCrypto(void); /** \ingroup rpmpgp * Duplicate a digest context. * @param octx existing digest context * @return duplicated digest context */ DIGEST_CTX rpmDigestDup(DIGEST_CTX octx); /** \ingroup rpmpgp * Obtain digest length in bytes. * @param hashalgo type of digest * @return digest length, zero on invalid algorithm */ size_t rpmDigestLength(int hashalgo); /** \ingroup rpmpgp * Initialize digest. * Set bit count to 0 and buffer to mysterious initialization constants. * @param hashalgo type of digest * @param flags bit(s) to control digest operation * @return digest context */ DIGEST_CTX rpmDigestInit(int hashalgo, rpmDigestFlags flags); /** \ingroup rpmpgp * Update context with next plain text buffer. * @param ctx digest context * @param data next data buffer * @param len no. bytes of data * @return 0 on success */ int rpmDigestUpdate(DIGEST_CTX ctx, const void * data, size_t len); /** \ingroup rpmpgp * Return digest and destroy context. * Final wrapup - pad to 64-byte boundary with the bit pattern * 1 0* (64-bit count of bits processed, MSB-first) * * @param ctx digest context * @retval datap address of returned digest * @retval lenp address of digest length * @param asAscii return digest as ascii string? * @return 0 on success */ int rpmDigestFinal(DIGEST_CTX ctx, void ** datap, size_t * lenp, int asAscii); /** \ingroup rpmpgp * Create a new digest bundle. * @return New digest bundle */ rpmDigestBundle rpmDigestBundleNew(void); /** \ingroup rpmpgp * Free a digest bundle and all contained digest contexts. * @param bundle digest bundle * @return NULL always */ rpmDigestBundle rpmDigestBundleFree(rpmDigestBundle bundle); /** \ingroup rpmpgp * Add a new type of digest to a bundle. * @param bundle digest bundle * @param algo type of digest * @param flags bit(s) to control digest operation * @return 0 on success */ int rpmDigestBundleAdd(rpmDigestBundle bundle, int algo, rpmDigestFlags flags); /** \ingroup rpmpgp * Update contexts within bundle with next plain text buffer. * @param bundle digest bundle * @param data next data buffer * @param len no. bytes of data * @return 0 on success */ int rpmDigestBundleUpdate(rpmDigestBundle bundle, const void *data, size_t len); /** \ingroup rpmpgp * Return digest from a bundle and destroy context, see rpmDigestFinal(). * * @param bundle digest bundle * @param algo type of digest to return * @retval datap address of returned digest * @retval lenp address of digest length * @param asAscii return digest as ascii string? * @return 0 on success */ int rpmDigestBundleFinal(rpmDigestBundle bundle, int algo, void ** datap, size_t * lenp, int asAscii); /** \ingroup rpmpgp * Duplicate a digest context from a bundle. * @param bundle digest bundle * @param algo type of digest to dup * @return duplicated digest context */ DIGEST_CTX rpmDigestBundleDupCtx(rpmDigestBundle bundle, int algo); #ifdef __cplusplus } #endif #endif /* H_RPMPGP */
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