2 This file is part of GNUnet.
3 (C) 2001-2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
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22 * @file include/gnunet_crypto_lib.h
23 * @brief cryptographic primitives for GNUnet
25 * @author Christian Grothoff
26 * @author Krista Bennett
27 * @author Gerd Knorr <kraxel@bytesex.org>
28 * @author Ioana Patrascu
29 * @author Tzvetan Horozov
31 * @defgroup crypto Cryptographic operations
32 * @defgroup hash Hashing and operations on hashes
35 #ifndef GNUNET_CRYPTO_LIB_H
36 #define GNUNET_CRYPTO_LIB_H
41 #if 0 /* keep Emacsens' auto-indent happy */
47 * @brief A 512-bit hashcode
49 struct GNUNET_HashCode;
52 * The identity of the host (wraps the signing key of the peer).
54 struct GNUNET_PeerIdentity;
56 #include "gnunet_common.h"
57 #include "gnunet_scheduler_lib.h"
61 * @brief A 512-bit hashcode
63 struct GNUNET_HashCode
65 uint32_t bits[512 / 8 / sizeof (uint32_t)]; /* = 16 */
70 * Maximum length of an ECC signature.
71 * Note: round up to multiple of 8 minus 2 for alignment.
73 #define GNUNET_CRYPTO_ECC_SIGNATURE_DATA_ENCODING_LENGTH 126
77 * Desired quality level for random numbers.
80 enum GNUNET_CRYPTO_Quality
83 * No good quality of the operation is needed (i.e.,
84 * random numbers can be pseudo-random).
87 GNUNET_CRYPTO_QUALITY_WEAK,
90 * High-quality operations are desired.
93 GNUNET_CRYPTO_QUALITY_STRONG,
96 * Randomness for IVs etc. is required.
99 GNUNET_CRYPTO_QUALITY_NONCE
104 * @brief length of the sessionkey in bytes (256 BIT sessionkey)
106 #define GNUNET_CRYPTO_AES_KEY_LENGTH (256/8)
109 * Length of a hash value
111 #define GNUNET_CRYPTO_HASH_LENGTH (512/8)
114 * @brief 0-terminated ASCII encoding of a struct GNUNET_HashCode.
116 struct GNUNET_CRYPTO_HashAsciiEncoded
118 unsigned char encoding[104];
122 GNUNET_NETWORK_STRUCT_BEGIN
126 * @brief header of what an ECC signature signs
127 * this must be followed by "size - 8" bytes of
128 * the actual signed data
130 struct GNUNET_CRYPTO_EccSignaturePurpose
133 * How many bytes does this signature sign?
134 * (including this purpose header); in network
137 uint32_t size GNUNET_PACKED;
140 * What does this signature vouch for? This
141 * must contain a GNUNET_SIGNATURE_PURPOSE_XXX
142 * constant (from gnunet_signatures.h). In
143 * network byte order!
145 uint32_t purpose GNUNET_PACKED;
151 * @brief an ECC signature
153 struct GNUNET_CRYPTO_EccSignature
159 unsigned char r[256 / 8];
164 unsigned char s[256 / 8];
170 * Public ECC key (always for NIST P-521) encoded in a format suitable
171 * for network transmission and signatures (ECDSA/EdDSA).
173 struct GNUNET_CRYPTO_EccPublicSignKey
176 * Q consists of an x- and a y-value, each mod p (256 bits),
177 * given here in affine coordinates.
179 * FIXME: this coordinate will be removed in the future (compressed point!).
181 unsigned char q_x[256 / 8];
184 * Q consists of an x- and a y-value, each mod p (256 bits),
185 * given here in affine coordinates.
187 unsigned char q_y[256 / 8];
194 * The identity of the host (wraps the signing key of the peer).
196 struct GNUNET_PeerIdentity
198 struct GNUNET_CRYPTO_EccPublicSignKey public_key;
203 * Public ECC key (always for NIST P-521) encoded in a format suitable
204 * for network transmission and encryption (ECDH).
206 struct GNUNET_CRYPTO_EccPublicEncryptKey
209 * Q consists of an x- and a y-value, each mod p (256 bits),
210 * given here in affine coordinates.
212 unsigned char q_x[256 / 8];
215 * Q consists of an x- and a y-value, each mod p (256 bits),
216 * given here in affine coordinates.
218 * FIXME: this coordinate will be removed in the future (compressed point!).
220 unsigned char q_y[256 / 8];
226 * Private ECC key encoded for transmission.
228 struct GNUNET_CRYPTO_EccPrivateKey
231 * d is a value mod n, where n has at most 256 bits.
233 unsigned char d[256 / 8];
239 * @brief type for session keys
241 struct GNUNET_CRYPTO_SymmetricSessionKey
244 * Actual key for AES.
246 unsigned char aes_key[GNUNET_CRYPTO_AES_KEY_LENGTH];
249 * Actual key for TwoFish.
251 unsigned char twofish_key[GNUNET_CRYPTO_AES_KEY_LENGTH];
255 GNUNET_NETWORK_STRUCT_END
258 * @brief IV for sym cipher
260 * NOTE: must be smaller (!) in size than the
261 * `struct GNUNET_HashCode`.
263 struct GNUNET_CRYPTO_SymmetricInitializationVector
265 unsigned char aes_iv[GNUNET_CRYPTO_AES_KEY_LENGTH / 2];
267 unsigned char twofish_iv[GNUNET_CRYPTO_AES_KEY_LENGTH / 2];
272 * @brief type for (message) authentication keys
274 struct GNUNET_CRYPTO_AuthKey
276 unsigned char key[GNUNET_CRYPTO_HASH_LENGTH];
280 /* **************** Functions and Macros ************* */
284 * Seed a weak random generator. Only #GNUNET_CRYPTO_QUALITY_WEAK-mode generator
287 * @param seed the seed to use
290 GNUNET_CRYPTO_seed_weak_random (int32_t seed);
294 * Perform an incremental step in a CRC16 (for TCP/IP) calculation.
296 * @param sum current sum, initially 0
297 * @param buf buffer to calculate CRC over (must be 16-bit aligned)
298 * @param len number of bytes in @a buf, must be multiple of 2
299 * @return updated crc sum (must be subjected to GNUNET_CRYPTO_crc16_finish to get actual crc16)
302 GNUNET_CRYPTO_crc16_step (uint32_t sum, const void *buf, size_t len);
306 * Convert results from GNUNET_CRYPTO_crc16_step to final crc16.
308 * @param sum cummulative sum
309 * @return crc16 value
312 GNUNET_CRYPTO_crc16_finish (uint32_t sum);
317 * Calculate the checksum of a buffer in one step.
319 * @param buf buffer to calculate CRC over (must be 16-bit aligned)
320 * @param len number of bytes in @a buf, must be multiple of 2
321 * @return crc16 value
324 GNUNET_CRYPTO_crc16_n (const void *buf, size_t len);
329 * Compute the CRC32 checksum for the first len
330 * bytes of the buffer.
332 * @param buf the data over which we're taking the CRC
333 * @param len the length of the buffer @a buf in bytes
334 * @return the resulting CRC32 checksum
337 GNUNET_CRYPTO_crc32_n (const void *buf, size_t len);
342 * Produce a random value.
344 * @param mode desired quality of the random number
345 * @param i the upper limit (exclusive) for the random number
346 * @return a random value in the interval [0,@a i) (exclusive).
349 GNUNET_CRYPTO_random_u32 (enum GNUNET_CRYPTO_Quality mode, uint32_t i);
354 * Random on unsigned 64-bit values.
356 * @param mode desired quality of the random number
357 * @param max value returned will be in range [0,@a max) (exclusive)
358 * @return random 64-bit number
361 GNUNET_CRYPTO_random_u64 (enum GNUNET_CRYPTO_Quality mode, uint64_t max);
366 * Get an array with a random permutation of the
368 * @param mode #GNUNET_CRYPTO_QUALITY_STRONG if the strong (but expensive) PRNG should be used,
369 * #GNUNET_CRYPTO_QUALITY_WEAK or #GNUNET_CRYPTO_QUALITY_NONCE otherwise
370 * @param n the size of the array
371 * @return the permutation array (allocated from heap)
374 GNUNET_CRYPTO_random_permute (enum GNUNET_CRYPTO_Quality mode, unsigned int n);
379 * Create a new random session key.
381 * @param key key to initialize
384 GNUNET_CRYPTO_symmetric_create_session_key (struct GNUNET_CRYPTO_SymmetricSessionKey *key);
389 * Encrypt a block using a symmetric sessionkey.
391 * @param block the block to encrypt
392 * @param len the size of the block
393 * @param sessionkey the key used to encrypt
394 * @param iv the initialization vector to use, use INITVALUE
396 * @return the size of the encrypted block, -1 for errors
399 GNUNET_CRYPTO_symmetric_encrypt (const void *block, size_t len,
400 const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey,
401 const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
407 * Decrypt a given block using a symmetric sessionkey.
409 * @param block the data to decrypt, encoded as returned by encrypt
410 * @param size how big is the block?
411 * @param sessionkey the key used to decrypt
412 * @param iv the initialization vector to use
413 * @param result address to store the result at
414 * @return -1 on failure, size of decrypted block on success
417 GNUNET_CRYPTO_symmetric_decrypt (const void *block, size_t size,
418 const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey,
419 const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
425 * @brief Derive an IV
426 * @param iv initialization vector
427 * @param skey session key
428 * @param salt salt for the derivation
429 * @param salt_len size of the salt
430 * @param ... pairs of void * & size_t for context chunks, terminated by NULL
433 GNUNET_CRYPTO_symmetric_derive_iv (struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
434 const struct GNUNET_CRYPTO_SymmetricSessionKey *skey,
436 size_t salt_len, ...);
440 * @brief Derive an IV
441 * @param iv initialization vector
442 * @param skey session key
443 * @param salt salt for the derivation
444 * @param salt_len size of the salt
445 * @param argp pairs of void * & size_t for context chunks, terminated by NULL
448 GNUNET_CRYPTO_symmetric_derive_iv_v (struct GNUNET_CRYPTO_SymmetricInitializationVector *iv,
449 const struct GNUNET_CRYPTO_SymmetricSessionKey *skey,
457 * Convert hash to ASCII encoding.
458 * @param block the hash code
459 * @param result where to store the encoding (struct GNUNET_CRYPTO_HashAsciiEncoded can be
460 * safely cast to char*, a '\\0' termination is set).
463 GNUNET_CRYPTO_hash_to_enc (const struct GNUNET_HashCode * block,
464 struct GNUNET_CRYPTO_HashAsciiEncoded *result);
469 * Convert ASCII encoding back to a 'struct GNUNET_HashCode'
471 * @param enc the encoding
472 * @param enclen number of characters in @a enc (without 0-terminator, which can be missing)
473 * @param result where to store the hash code
474 * @return #GNUNET_OK on success, #GNUNET_SYSERR if result has the wrong encoding
477 GNUNET_CRYPTO_hash_from_string2 (const char *enc, size_t enclen,
478 struct GNUNET_HashCode *result);
483 * Convert ASCII encoding back to `struct GNUNET_HashCode`
485 * @param enc the encoding
486 * @param result where to store the hash code
487 * @return #GNUNET_OK on success, #GNUNET_SYSERR if result has the wrong encoding
489 #define GNUNET_CRYPTO_hash_from_string(enc, result) \
490 GNUNET_CRYPTO_hash_from_string2 (enc, strlen(enc), result)
496 * Compute the distance between 2 hashcodes. The
497 * computation must be fast, not involve a[0] or a[4] (they're used
498 * elsewhere), and be somewhat consistent. And of course, the result
499 * should be a positive number.
501 * @param a some hash code
502 * @param b some hash code
503 * @return number between 0 and UINT32_MAX
506 GNUNET_CRYPTO_hash_distance_u32 (const struct GNUNET_HashCode * a,
507 const struct GNUNET_HashCode * b);
512 * Compute hash of a given block.
514 * @param block the data to hash
515 * @param size size of the @a block
516 * @param ret pointer to where to write the hashcode
519 GNUNET_CRYPTO_hash (const void *block, size_t size, struct GNUNET_HashCode * ret);
524 * Calculate HMAC of a message (RFC 2104)
526 * @param key secret key
527 * @param plaintext input plaintext
528 * @param plaintext_len length of @a plaintext
529 * @param hmac where to store the hmac
532 GNUNET_CRYPTO_hmac (const struct GNUNET_CRYPTO_AuthKey *key,
533 const void *plaintext, size_t plaintext_len,
534 struct GNUNET_HashCode * hmac);
538 * Function called once the hash computation over the
539 * specified file has completed.
542 * @param res resulting hash, NULL on error
544 typedef void (*GNUNET_CRYPTO_HashCompletedCallback) (void *cls,
545 const struct GNUNET_HashCode *
550 * Handle to file hashing operation.
552 struct GNUNET_CRYPTO_FileHashContext;
557 * Compute the hash of an entire file.
559 * @param priority scheduling priority to use
560 * @param filename name of file to hash
561 * @param blocksize number of bytes to process in one task
562 * @param callback function to call upon completion
563 * @param callback_cls closure for @a callback
564 * @return NULL on (immediate) errror
566 struct GNUNET_CRYPTO_FileHashContext *
567 GNUNET_CRYPTO_hash_file (enum GNUNET_SCHEDULER_Priority priority,
568 const char *filename, size_t blocksize,
569 GNUNET_CRYPTO_HashCompletedCallback callback,
574 * Cancel a file hashing operation.
576 * @param fhc operation to cancel (callback must not yet have been invoked)
579 GNUNET_CRYPTO_hash_file_cancel (struct GNUNET_CRYPTO_FileHashContext *fhc);
584 * Create a random hash code.
586 * @param mode desired quality level
587 * @param result hash code that is randomized
590 GNUNET_CRYPTO_hash_create_random (enum GNUNET_CRYPTO_Quality mode,
591 struct GNUNET_HashCode *result);
596 * compute result(delta) = b - a
598 * @param a some hash code
599 * @param b some hash code
600 * @param result set to @a b - @a a
603 GNUNET_CRYPTO_hash_difference (const struct GNUNET_HashCode * a,
604 const struct GNUNET_HashCode * b,
605 struct GNUNET_HashCode * result);
610 * compute result(b) = a + delta
612 * @param a some hash code
613 * @param delta some hash code
614 * @param result set to @a a + @a delta
617 GNUNET_CRYPTO_hash_sum (const struct GNUNET_HashCode * a,
618 const struct GNUNET_HashCode * delta,
619 struct GNUNET_HashCode * result);
624 * compute result = a ^ b
626 * @param a some hash code
627 * @param b some hash code
628 * @param result set to @a a ^ @a b
631 GNUNET_CRYPTO_hash_xor (const struct GNUNET_HashCode * a, const struct GNUNET_HashCode * b,
632 struct GNUNET_HashCode * result);
637 * Convert a hashcode into a key.
639 * @param hc hash code that serves to generate the key
640 * @param skey set to a valid session key
641 * @param iv set to a valid initialization vector
644 GNUNET_CRYPTO_hash_to_aes_key (const struct GNUNET_HashCode * hc,
645 struct GNUNET_CRYPTO_SymmetricSessionKey *skey,
646 struct GNUNET_CRYPTO_SymmetricInitializationVector
652 * Obtain a bit from a hashcode.
654 * @param code the `struct GNUNET_HashCode` to index bit-wise
655 * @param bit index into the hashcode, [0...159]
656 * @return Bit \a bit from hashcode \a code, -1 for invalid index
659 GNUNET_CRYPTO_hash_get_bit (const struct GNUNET_HashCode *code,
665 * Determine how many low order bits match in two
666 * struct GNUNET_HashCodes. i.e. - 010011 and 011111 share
667 * the first two lowest order bits, and therefore the
668 * return value is two (NOT XOR distance, nor how many
669 * bits match absolutely!).
671 * @param first the first hashcode
672 * @param second the hashcode to compare first to
673 * @return the number of bits that match
676 GNUNET_CRYPTO_hash_matching_bits (const struct GNUNET_HashCode * first,
677 const struct GNUNET_HashCode * second);
682 * Compare function for HashCodes, producing a total ordering
685 * @param h1 some hash code
686 * @param h2 some hash code
687 * @return 1 if h1 > h2, -1 if h1 < h2 and 0 if h1 == h2.
690 GNUNET_CRYPTO_hash_cmp (const struct GNUNET_HashCode * h1, const struct GNUNET_HashCode * h2);
695 * Find out which of the two GNUNET_CRYPTO_hash codes is closer to target
696 * in the XOR metric (Kademlia).
698 * @param h1 some hash code
699 * @param h2 some hash code
700 * @param target some hash code
701 * @return -1 if h1 is closer, 1 if h2 is closer and 0 if h1==h2.
704 GNUNET_CRYPTO_hash_xorcmp (const struct GNUNET_HashCode * h1,
705 const struct GNUNET_HashCode * h2,
706 const struct GNUNET_HashCode * target);
711 * @brief Derive an authentication key
712 * @param key authentication key
713 * @param rkey root key
715 * @param salt_len size of the salt
716 * @param argp pair of void * & size_t for context chunks, terminated by NULL
719 GNUNET_CRYPTO_hmac_derive_key_v (struct GNUNET_CRYPTO_AuthKey *key,
720 const struct GNUNET_CRYPTO_SymmetricSessionKey *rkey,
721 const void *salt, size_t salt_len,
727 * @brief Derive an authentication key
728 * @param key authentication key
729 * @param rkey root key
731 * @param salt_len size of the salt
732 * @param ... pair of void * & size_t for context chunks, terminated by NULL
735 GNUNET_CRYPTO_hmac_derive_key (struct GNUNET_CRYPTO_AuthKey *key,
736 const struct GNUNET_CRYPTO_SymmetricSessionKey *rkey,
737 const void *salt, size_t salt_len, ...);
743 * @param result buffer for the derived key, allocated by caller
744 * @param out_len desired length of the derived key
745 * @param xtr_algo hash algorithm for the extraction phase, GCRY_MD_...
746 * @param prf_algo hash algorithm for the expansion phase, GCRY_MD_...
748 * @param xts_len length of xts
749 * @param skm source key material
750 * @param skm_len length of skm
751 * @param ... pair of void * & size_t for context chunks, terminated by NULL
752 * @return GNUNET_YES on success
755 GNUNET_CRYPTO_hkdf (void *result, size_t out_len, int xtr_algo, int prf_algo,
756 const void *xts, size_t xts_len, const void *skm,
757 size_t skm_len, ...);
763 * @param result buffer for the derived key, allocated by caller
764 * @param out_len desired length of the derived key
765 * @param xtr_algo hash algorithm for the extraction phase, GCRY_MD_...
766 * @param prf_algo hash algorithm for the expansion phase, GCRY_MD_...
768 * @param xts_len length of xts
769 * @param skm source key material
770 * @param skm_len length of skm
771 * @param argp va_list of void * & size_t pairs for context chunks
772 * @return GNUNET_YES on success
775 GNUNET_CRYPTO_hkdf_v (void *result, size_t out_len, int xtr_algo, int prf_algo,
776 const void *xts, size_t xts_len, const void *skm,
777 size_t skm_len, va_list argp);
782 * @param result buffer for the derived key, allocated by caller
783 * @param out_len desired length of the derived key
785 * @param xts_len length of xts
786 * @param skm source key material
787 * @param skm_len length of skm
788 * @param argp va_list of void * & size_t pairs for context chunks
789 * @return GNUNET_YES on success
792 GNUNET_CRYPTO_kdf_v (void *result, size_t out_len, const void *xts,
793 size_t xts_len, const void *skm, size_t skm_len,
800 * @param result buffer for the derived key, allocated by caller
801 * @param out_len desired length of the derived key
803 * @param xts_len length of xts
804 * @param skm source key material
805 * @param skm_len length of skm
806 * @param ... void * & size_t pairs for context chunks
807 * @return #GNUNET_YES on success
810 GNUNET_CRYPTO_kdf (void *result, size_t out_len, const void *xts,
811 size_t xts_len, const void *skm, size_t skm_len, ...);
815 * Function called upon completion of 'GNUNET_CRYPTO_ecc_key_create_async'.
818 * @param pk NULL on error, otherwise the private key (which must be free'd by the callee)
819 * @param emsg NULL on success, otherwise an error message
821 typedef void (*GNUNET_CRYPTO_EccKeyCallback)(void *cls,
822 struct GNUNET_CRYPTO_EccPrivateKey *pk,
828 * Extract the public key for the given private key.
830 * @param priv the private key
831 * @param pub where to write the public key
834 GNUNET_CRYPTO_ecc_key_get_public_for_signature (const struct GNUNET_CRYPTO_EccPrivateKey *priv,
835 struct GNUNET_CRYPTO_EccPublicSignKey *pub);
841 * Extract the public key for the given private key.
843 * @param priv the private key
844 * @param pub where to write the public key
847 GNUNET_CRYPTO_ecc_key_get_public_for_encryption (const struct GNUNET_CRYPTO_EccPrivateKey *priv,
848 struct GNUNET_CRYPTO_EccPublicEncryptKey *pub);
852 * Convert a public key to a string.
854 * @param pub key to convert
855 * @return string representing @a pub
858 GNUNET_CRYPTO_ecc_public_sign_key_to_string (const struct GNUNET_CRYPTO_EccPublicSignKey *pub);
862 * Convert a string representing a public key to a public key.
864 * @param enc encoded public key
865 * @param enclen number of bytes in @a enc (without 0-terminator)
866 * @param pub where to store the public key
867 * @return #GNUNET_OK on success
870 GNUNET_CRYPTO_ecc_public_sign_key_from_string (const char *enc,
872 struct GNUNET_CRYPTO_EccPublicSignKey *pub);
877 * Convert a public key to a string.
879 * @param pub key to convert
880 * @return string representing @a pub
883 GNUNET_CRYPTO_ecc_public_encrypt_key_to_string (const struct GNUNET_CRYPTO_EccPublicEncryptKey *pub);
887 * Convert a string representing a public key to a public key.
889 * @param enc encoded public key
890 * @param enclen number of bytes in @a enc (without 0-terminator)
891 * @param pub where to store the public key
892 * @return #GNUNET_OK on success
895 GNUNET_CRYPTO_ecc_public_encrypt_key_from_string (const char *enc,
897 struct GNUNET_CRYPTO_EccPublicEncryptKey *pub);
902 * Create a new private key by reading it from a file. If the
903 * files does not exist, create a new key and write it to the
904 * file. Caller must free return value. Note that this function
905 * can not guarantee that another process might not be trying
906 * the same operation on the same file at the same time.
907 * If the contents of the file
908 * are invalid the old file is deleted and a fresh key is
911 * @param filename name of file to use to store the key
912 * @return new private key, NULL on error (for example,
913 * permission denied); free using #GNUNET_free
915 struct GNUNET_CRYPTO_EccPrivateKey *
916 GNUNET_CRYPTO_ecc_key_create_from_file (const char *filename);
921 * Create a new private key by reading our peer's key from
922 * the file specified in the configuration.
924 * @param cfg the configuration to use
925 * @return new private key, NULL on error (for example,
926 * permission denied); free using #GNUNET_free
928 struct GNUNET_CRYPTO_EccPrivateKey *
929 GNUNET_CRYPTO_ecc_key_create_from_configuration (const struct GNUNET_CONFIGURATION_Handle *cfg);
934 * Create a new private key. Caller must free return value.
936 * @return fresh private key; free using #GNUNET_free
938 struct GNUNET_CRYPTO_EccPrivateKey *
939 GNUNET_CRYPTO_ecc_key_create (void);
944 * Clear memory that was used to store a private key.
946 * @param pk location of the key
949 GNUNET_CRYPTO_ecc_key_clear (struct GNUNET_CRYPTO_EccPrivateKey *pk);
954 * Get the shared private key we use for anonymous users.
956 * @return "anonymous" private key; do not free
958 const struct GNUNET_CRYPTO_EccPrivateKey *
959 GNUNET_CRYPTO_ecc_key_get_anonymous (void);
964 * Setup a hostkey file for a peer given the name of the
965 * configuration file (!). This function is used so that
966 * at a later point code can be certain that reading a
967 * hostkey is fast (for example in time-dependent testcases).
969 * @param cfg_name name of the configuration file to use
972 GNUNET_CRYPTO_ecc_setup_hostkey (const char *cfg_name);
977 * Retrieve the identity of the host's peer.
979 * @param cfg configuration to use
980 * @param dst pointer to where to write the peer identity
981 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the identity
982 * could not be retrieved
985 GNUNET_CRYPTO_get_peer_identity (const struct GNUNET_CONFIGURATION_Handle *cfg,
986 struct GNUNET_PeerIdentity *dst);
991 * Derive key material from a public and a private ECC key.
993 * @param priv private key to use for the ECDH (x)
994 * @param pub public key to use for the ECDY (yG)
995 * @param key_material where to write the key material (xyG)
996 * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
999 GNUNET_CRYPTO_ecc_ecdh (const struct GNUNET_CRYPTO_EccPrivateKey *priv,
1000 const struct GNUNET_CRYPTO_EccPublicEncryptKey *pub,
1001 struct GNUNET_HashCode *key_material);
1006 * Sign a given block.
1008 * @param priv private key to use for the signing
1009 * @param purpose what to sign (size, purpose)
1010 * @param sig where to write the signature
1011 * @return #GNUNET_SYSERR on error, #GNUNET_OK on success
1014 GNUNET_CRYPTO_ecc_sign (const struct GNUNET_CRYPTO_EccPrivateKey *priv,
1015 const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose,
1016 struct GNUNET_CRYPTO_EccSignature *sig);
1023 * @param purpose what is the purpose that the signature should have?
1024 * @param validate block to validate (size, purpose, data)
1025 * @param sig signature that is being validated
1026 * @param pub public key of the signer
1027 * @returns #GNUNET_OK if ok, #GNUNET_SYSERR if invalid
1030 GNUNET_CRYPTO_ecc_verify (uint32_t purpose,
1031 const struct GNUNET_CRYPTO_EccSignaturePurpose *validate,
1032 const struct GNUNET_CRYPTO_EccSignature *sig,
1033 const struct GNUNET_CRYPTO_EccPublicSignKey *pub);
1038 * Derive a private key from a given private key and a label.
1039 * Essentially calculates a private key 'h = H(l,P) * d mod n'
1040 * where n is the size of the ECC group and P is the public
1041 * key associated with the private key 'd'.
1043 * @param priv original private key
1044 * @param label label to use for key deriviation
1045 * @param context additional context to use for HKDF of 'h';
1046 * typically the name of the subsystem/application
1047 * @return derived private key
1049 struct GNUNET_CRYPTO_EccPrivateKey *
1050 GNUNET_CRYPTO_ecc_key_derive (const struct GNUNET_CRYPTO_EccPrivateKey *priv,
1052 const char *context);
1057 * Derive a public key from a given public key and a label.
1058 * Essentially calculates a public key 'V = H(l,P) * P'.
1060 * @param pub original public key
1061 * @param label label to use for key deriviation
1062 * @param context additional context to use for HKDF of 'h'.
1063 * typically the name of the subsystem/application
1064 * @param result where to write the derived public key
1067 GNUNET_CRYPTO_ecc_public_key_derive (const struct GNUNET_CRYPTO_EccPublicSignKey *pub,
1069 const char *context,
1070 struct GNUNET_CRYPTO_EccPublicSignKey *result);
1073 #if 0 /* keep Emacsens' auto-indent happy */
1081 /* ifndef GNUNET_CRYPTO_LIB_H */
1083 /* end of gnunet_crypto_lib.h */