--- /dev/null
+/* -*-c-*-
+ *
+ * The RSA public-key cryptosystem
+ *
+ * (c) 1999 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef CATACOMB_RSA_H
+#define CATACOMB_RSA_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#ifndef CATACOMB_GRAND_H
+# include "grand.h"
+#endif
+
+#ifndef CATACOMB_GCIPHER_H
+# include "gcipher.h"
+#endif
+
+#ifndef CATACOMB_GHASH_H
+# include "ghash.h"
+#endif
+
+#ifndef CATACOMB_KEY_H
+# include "key.h"
+#endif
+
+#ifndef CATACOMB_MP_H
+# include "mp.h"
+#endif
+
+#ifndef CATACOMB_PGEN_H
+# include "pgen.h"
+#endif
+
+/*----- Data structures ---------------------------------------------------*/
+
+/* --- RSA private and public keys --- */
+
+typedef struct rsa_pub {
+ mp *n;
+ mp *e;
+} rsa_pub;
+
+typedef struct rsa_priv {
+ mp *n, *p, *q, *q_inv;
+ mp *e, *d, *dp, *dq;
+} rsa_priv;
+
+/* --- RSA private and public key contexts --- *
+ *
+ * These are used to store information about `active' keys which will speed
+ * up the various operations.
+ */
+
+typedef struct rsa_privctx {
+ rsa_priv *rp;
+ grand *r;
+ mpmont nm, pm, qm;
+} rsa_privctx;
+
+typedef struct rsa_pubctx {
+ mpmont mm;
+ rsa_pub *rp;
+} rsa_pubctx;
+
+/* --- Encoding and decoding function schemas --- *
+ *
+ * See `oaep.h' and `pkcs1.h' for appropriate encoding functions.
+ */
+
+typedef mp *rsa_pad(mp */*d*/, const void */*m*/, size_t /*msz*/,
+ octet */*b*/, size_t /*sz*/,
+ unsigned long /*nbits*/, void */*p*/);
+
+typedef int rsa_decunpad(mp */*m*/, octet */*b*/, size_t /*sz*/,
+ unsigned long /*nbits*/, void */*p*/);
+
+typedef int rsa_vrfunpad(mp */*s*/, const void */*m*/, size_t /*msz*/,
+ octet */*b*/, size_t /*sz*/,
+ unsigned long /*nbits*/, void */*p*/);
+
+/*----- Key fetching ------------------------------------------------------*/
+
+extern const key_fetchdef rsa_pubfetch[];
+#define RSA_PUBFETCHSZ 4
+
+extern const key_fetchdef rsa_privfetch[];
+#define RSA_PRIVFETCHSZ 12
+
+/* --- @rsa_pubfree@, @rsa_privfree@ --- *
+ *
+ * Arguments: @rsa_pub *rp@, @rsa_priv *rp@ = pointer to key block
+ *
+ * Returns: ---
+ *
+ * Use: Frees an RSA key block.
+ */
+
+extern void rsa_pubfree(rsa_pub */*rp*/);
+extern void rsa_privfree(rsa_priv */*rp*/);
+
+/*----- RSA private key operations ----------------------------------------*/
+
+/* --- @rsa_privcreate@ --- *
+ *
+ * Arguments: @rsa_privctx *rd@ = pointer to an RSA private key context
+ * @rsa_priv *rp@ = pointer to RSA private key
+ * @grand *r@ = pointer to random number source for blinding
+ *
+ * Returns: ---
+ *
+ * Use: Initializes an RSA private-key context. Keeping a context
+ * for several decryption or signing operations provides a minor
+ * performance benefit.
+ *
+ * The random number source may be null if blinding is not
+ * desired. This improves decryption speed, at the risk of
+ * permitting timing attacks.
+ */
+
+extern void rsa_privcreate(rsa_privctx */*rd*/, rsa_priv */*rp*/,
+ grand */*r*/);
+
+/* --- @rsa_privdestroy@ --- *
+ *
+ * Arguments: @rsa_privctx *rd@ = pointer to an RSA decryption context
+ *
+ * Returns: ---
+ *
+ * Use: Destroys an RSA decryption context.
+ */
+
+extern void rsa_privdestroy(rsa_privctx */*rd*/);
+
+/* --- @rsa_privop@ --- *
+ *
+ * Arguments: @rsa_privctx *rd@ = pointer to RSA private key context
+ * @mp *d@ = destination
+ * @mp *c@ = input message
+ *
+ * Returns: The transformed output message.
+ *
+ * Use: Performs an RSA private key operation. This function takes
+ * advantage of knowledge of the key factors in order to speed
+ * up decryption. It also blinds the ciphertext prior to
+ * decryption and unblinds it afterwards to thwart timing
+ * attacks.
+ */
+
+extern mp *rsa_privop(rsa_privctx */*rd*/, mp */*d*/, mp */*c*/);
+
+/* --- @rsa_qprivop@ --- *
+ *
+ * Arguments: @rsa_priv *rp@ = pointer to RSA parameters
+ * @mp *d@ = destination
+ * @mp *c@ = input message
+ * @grand *r@ = pointer to random number source for blinding
+ *
+ * Returns: Correctly transformed output message
+ *
+ * Use: Performs an RSA private key operation, very carefully.
+ */
+
+extern mp *rsa_qprivop(rsa_priv */*rp*/, mp */*d*/, mp */*c*/, grand */*r*/);
+
+/* --- @rsa_sign@ --- *
+ *
+ * Arguments: @rsa_privctx *rp@ = pointer to an RSA private key context
+ * @mp *d@ = where to put the result
+ * @const void *m@ = pointer to input message
+ * @size_t msz@ = size of input message
+ * @rsa_pad *e@ = encoding procedure
+ * @void *earg@ = argument pointer for encoding procedure
+ *
+ * Returns: The signature, as a multiprecision integer, or null on
+ * failure.
+ *
+ * Use: Computes an RSA digital signature.
+ */
+
+extern mp *rsa_sign(rsa_privctx */*rp*/, mp */*d*/,
+ const void */*m*/, size_t /*msz*/,
+ rsa_pad */*e*/, void */*earg*/);
+
+/* --- @rsa_decrypt@ --- *
+ *
+ * Arguments: @rsa_privctx *rp@ = pointer to an RSA private key context
+ * @mp *m@ = encrypted message, as a multiprecision integer
+ * @dstr *d@ = pointer to output string
+ * @rsa_decunpad *e@ = decoding procedure
+ * @void *earg@ = argument pointer for decoding procedure
+ *
+ * Returns: The length of the output string if successful, negative on
+ * failure.
+ *
+ * Use: Does RSA decryption.
+ */
+
+extern int rsa_decrypt(rsa_privctx */*rp*/, mp */*m*/,
+ dstr */*d*/, rsa_decunpad */*e*/, void */*earg*/);
+
+/*----- RSA public key operations -----------------------------------------*/
+
+/* --- @rsa_pubcreate@ --- *
+ *
+ * Arguments: @rsa_pubctx *rd@ = pointer to an RSA public key context
+ * @rsa_pub *rp@ = pointer to RSA public key
+ *
+ * Returns: ---
+ *
+ * Use: Initializes an RSA public-key context.
+ */
+
+extern void rsa_pubcreate(rsa_pubctx */*rd*/, rsa_pub */*rp*/);
+
+/* --- @rsa_pubdestroy@ --- *
+ *
+ * Arguments: @rsa_pubctx *rd@ = pointer to an RSA public key context
+ *
+ * Returns: ---
+ *
+ * Use: Destroys an RSA public-key context.
+ */
+
+extern void rsa_pubdestroy(rsa_pubctx */*rd*/);
+
+/* --- @rsa_pubop@ --- *
+ *
+ * Arguments: @rsa_pubctx *rd@ = pointer to an RSA public key context
+ * @mp *d@ = destination
+ * @mp *p@ = input message
+ *
+ * Returns: The transformed output message.
+ *
+ * Use: Performs an RSA public key operation.
+ */
+
+extern mp *rsa_pubop(rsa_pubctx */*rd*/, mp */*d*/, mp */*p*/);
+
+/* --- @rsa_qpubop@ --- *
+ *
+ * Arguments: @rsa_pub *rp@ = pointer to RSA parameters
+ * @mp *d@ = destination
+ * @mp *p@ = input message
+ *
+ * Returns: Correctly transformed output message.
+ *
+ * Use: Performs an RSA public key operation.
+ */
+
+extern mp *rsa_qpubop(rsa_pub */*rp*/, mp */*d*/, mp */*c*/);
+
+/* --- @rsa_encrypt@ --- *
+ *
+ * Arguments: @rsa_pubctx *rp@ = pointer to an RSA public key context
+ * @mp *d@ = proposed destination integer
+ * @const void *m@ = pointer to input message
+ * @size_t msz@ = size of input message
+ * @rsa_pad *e@ = encoding procedure
+ * @void *earg@ = argument pointer for encoding procedure
+ *
+ * Returns: The encrypted message, as a multiprecision integer, or null
+ * on failure.
+ *
+ * Use: Does RSA encryption.
+ */
+
+extern mp *rsa_encrypt(rsa_pubctx */*rp*/, mp */*d*/,
+ const void */*m*/, size_t /*msz*/,
+ rsa_pad */*e*/, void */*earg*/);
+
+/* --- @rsa_verify@ --- *
+ *
+ * Arguments: @rsa_pubctx *rp@ = pointer to an RSA public key contxt
+ * @mp *s@ = the signature, as a multiprecision integer
+ * @const void *m@ = pointer to message to verify, or null
+ * @size_t sz@ = size of input message
+ * @dstr *d@ = pointer to output string, or null
+ * @rsa_vfrunpad *e@ = decoding procedure
+ * @void *earg@ = argument pointer for decoding procedure
+ *
+ * Returns: The length of the output string if successful (0 if no output
+ * was wanted); negative on failure.
+ *
+ * Use: Does RSA signature verification. To use a signature scheme
+ * with recovery, pass in @m == 0@ and @d != 0@: the recovered
+ * message should appear in @d@. To use a signature scheme with
+ * appendix, provide @m != 0@ and @d == 0@; the result should be
+ * zero for success.
+ */
+
+extern int rsa_verify(rsa_pubctx */*rp*/, mp */*s*/,
+ const void */*m*/, size_t /*sz*/, dstr */*d*/,
+ rsa_vrfunpad */*e*/, void */*earg*/);
+
+/*----- Miscellaneous operations ------------------------------------------*/
+
+/* --- @rsa_gen@ --- *
+ *
+ * Arguments: @rsa_priv *rp@ = pointer to block to be filled in
+ * @unsigned nbits@ = required modulus size in bits
+ * @grand *r@ = random number source
+ * @unsigned n@ = number of attempts to make
+ * @pgen_proc *event@ = event handler function
+ * @void *ectx@ = argument for the event handler
+ *
+ * Returns: Zero if all went well, nonzero otherwise.
+ *
+ * Use: Constructs a pair of strong RSA primes and other useful RSA
+ * parameters. A small encryption exponent is chosen if
+ * possible.
+ */
+
+extern int rsa_gen(rsa_priv */*rp*/, unsigned /*nbits*/,
+ grand */*r*/, unsigned /*n*/,
+ pgen_proc */*event*/, void */*ectx*/);
+
+/* --- @rsa_recover@ --- *
+ *
+ * Arguments: @rsa_priv *rp@ = pointer to parameter block
+ *
+ * Returns: Zero if all went well, nonzero if the parameters make no
+ * sense.
+ *
+ * Use: Derives the full set of RSA parameters given a minimal set.
+ */
+
+extern int rsa_recover(rsa_priv */*rp*/);
+
+/*----- Padding schemes ---------------------------------------------------*/
+
+/* --- PKCS1 padding --- */
+
+typedef struct pkcs1 {
+ grand *r; /* Random number source */
+ const void *ep; /* Encoding parameters block */
+ size_t epsz; /* Size of the parameter block */
+} pkcs1;
+
+extern rsa_pad pkcs1_cryptencode;
+extern rsa_decunpad pkcs1_cryptdecode;
+extern rsa_pad pkcs1_sigencode;
+extern rsa_vrfunpad pkcs1_sigdecode;
+
+/* --- OAEP --- */
+
+typedef struct oaep {
+ const gccipher *cc; /* Cipher class for masking */
+ const gchash *ch; /* Hash class for parameter block */
+ grand *r; /* Random number source */
+ const void *ep; /* Encoding parameters block */
+ size_t epsz; /* Size of the parameter block */
+} oaep;
+
+extern rsa_pad oaep_encode;
+extern rsa_decunpad oaep_decode;
+
+/* --- PSS --- */
+
+typedef struct pss {
+ const gccipher *cc; /* Cipher class for masking */
+ const gchash *ch; /* Hash class for choosing a seed */
+ grand *r; /* Random number source */
+ size_t ssz; /* Requested salt size */
+} pss;
+
+extern rsa_pad pss_encode;
+extern rsa_vrfunpad pss_decode;
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
projects / u / mdw / catacomb / blobdiff