/* -*-c-*-
*
- * $Id: rsa.h,v 1.1 1999/12/22 15:50:45 mdw Exp $
+ * $Id: rsa.h,v 1.3 2000/07/01 11:24:37 mdw Exp $
*
* The RSA public-key cryptosystem
*
/*----- Revision history --------------------------------------------------*
*
* $Log: rsa.h,v $
+ * Revision 1.3 2000/07/01 11:24:37 mdw
+ * Remove bad type name `rsa_param'. New functions for freeing public and
+ * private keys. Add types and functions for doing pubic key operations,
+ * and padded RSA operations.
+ *
+ * Revision 1.2 2000/06/17 12:07:36 mdw
+ * Add key fetching interface. Add new rsa_decrypt interface.
+ *
* Revision 1.1 1999/12/22 15:50:45 mdw
* Initial RSA support.
*
# include "grand.h"
#endif
+#ifndef CATACOMB_KEY_H
+# include "key.h"
+#endif
+
#ifndef CATACOMB_MP_H
# include "mp.h"
#endif
/*----- Data structures ---------------------------------------------------*/
-typedef struct rsa_param {
- mp *p, *q;
+/* --- RSA private and public keys --- */
+
+typedef struct rsa_pub {
mp *n;
- mp *q_inv;
+ mp *e;
+} rsa_pub;
+
+typedef struct rsa_priv {
+ mp *n, *p, *q, *q_inv;
mp *e, *d, *dp, *dq;
-} rsa_param;
+} 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 int (*rsa_encodeproc)(const void */*m*/, size_t /*msz*/,
+ void */*buf*/, size_t /*sz*/, void */*p*/);
+typedef int (*rsa_decodeproc)(const void */*m*/, size_t /*msz*/,
+ dstr */*d*/, 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*/);
-/*----- Functions provided ------------------------------------------------*/
+/* --- @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
+ * @const void *m@ = pointer to input message
+ * @size_t sz@ = size of input message
+ * @dstr *d@ = pointer to output string
+ * @rsa_encodeproc e@ = encoding procedure
+ * @void *earg@ = argument pointer for encoding procedure
+ *
+ * Returns: The length of the output string if successful, negative on
+ * failure.
+ *
+ * Use: Computes an RSA digital signature.
+ */
+
+extern int rsa_sign(rsa_privctx */*rp*/, const void */*m*/, size_t /*sz*/,
+ dstr */*d*/, rsa_encodeproc /*e*/, void */*earg*/);
+
+/* --- @rsa_decrypt@ --- *
+ *
+ * Arguments: @rsa_privctx *rp@ = pointer to an RSA private key context
+ * @const void *m@ = pointer to input message
+ * @size_t sz@ = size of input message
+ * @dstr *d@ = pointer to output string
+ * @rsa_decodeproc 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 signature verification.
+ */
+
+extern int rsa_decrypt(rsa_privctx */*rp*/, const void */*m*/, size_t /*sz*/,
+ dstr */*d*/, rsa_decodeproc /*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
+ * @const void *m@ = pointer to input message
+ * @size_t sz@ = size of input message
+ * @dstr *d@ = pointer to output string
+ * @rsa_encodeproc e@ = encoding procedure
+ * @void *earg@ = argument pointer for encoding procedure
+ *
+ * Returns: The length of the output string if successful, negative on
+ * failure.
+ *
+ * Use: Does RSA encryption.
+ */
+
+extern int rsa_encrypt(rsa_pubctx */*rp*/, const void */*m*/, size_t /*sz*/,
+ dstr */*d*/, rsa_encodeproc /*e*/, void */*earg*/);
+
+/* --- @rsa_verify@ --- *
+ *
+ * Arguments: @rsa_pubctx *rp@ = pointer to an RSA public key contxt
+ * @const void *m@ = pointer to input message
+ * @size_t sz@ = size of input message
+ * @dstr *d@ = pointer to output string
+ * @rsa_decodeproc 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 signature verification.
+ */
+
+extern int rsa_verify(rsa_pubctx */*rp*/, const void */*m*/, size_t /*sz*/,
+ dstr */*d*/, rsa_decodeproc /*e*/, void */*earg*/);
+
+/*----- Miscellaneous operations ------------------------------------------*/
/* --- @rsa_gen@ --- *
*
- * Arguments: @rsa_param *rp@ = pointer to block to be filled in
+ * 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
* possible.
*/
-extern int rsa_gen(rsa_param */*rp*/, unsigned /*nbits*/,
+extern int rsa_gen(rsa_priv */*rp*/, unsigned /*nbits*/,
grand */*r*/, unsigned /*n*/,
pgen_proc */*event*/, void */*ectx*/);
-/* --- @rsa_decrypt@ --- *
- *
- * Arguments: @rsa_param *rp@ = pointer to RSA parameters
- * @mp *d@ = destination
- * @mp *c@ = ciphertext message
- * @grand *r@ = pointer to random number source for blinding
- *
- * Returns: Correctly decrypted message.
- *
- * Use: Performs RSA decryption, very carefully.
- */
-
-extern mp *rsa_decrypt(rsa_param */*rp*/, mp */*d*/, mp */*c*/,
- grand */*r*/);
-
/* --- @rsa_recover@ --- *
*
- * Arguments: @rsa_param *rp@ = pointer to parameter block
+ * 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_param */*rp*/);
+extern int rsa_recover(rsa_priv */*rp*/);
/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff