/* evp_int.h */
/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
 * 2015.
 */
/* ====================================================================
 * Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

struct evp_pkey_ctx_st {
    /* Method associated with this operation */
    const EVP_PKEY_METHOD *pmeth;
    /* Engine that implements this method or NULL if builtin */
    ENGINE *engine;
    /* Key: may be NULL */
    EVP_PKEY *pkey;
    /* Peer key for key agreement, may be NULL */
    EVP_PKEY *peerkey;
    /* Actual operation */
    int operation;
    /* Algorithm specific data */
    void *data;
    /* Application specific data */
    void *app_data;
    /* Keygen callback */
    EVP_PKEY_gen_cb *pkey_gencb;
    /* implementation specific keygen data */
    int *keygen_info;
    int keygen_info_count;
} /* EVP_PKEY_CTX */ ;

#define EVP_PKEY_FLAG_DYNAMIC   1

struct evp_pkey_method_st {
    int pkey_id;
    int flags;
    int (*init) (EVP_PKEY_CTX *ctx);
    int (*copy) (EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src);
    void (*cleanup) (EVP_PKEY_CTX *ctx);
    int (*paramgen_init) (EVP_PKEY_CTX *ctx);
    int (*paramgen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
    int (*keygen_init) (EVP_PKEY_CTX *ctx);
    int (*keygen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
    int (*sign_init) (EVP_PKEY_CTX *ctx);
    int (*sign) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
                 const unsigned char *tbs, size_t tbslen);
    int (*verify_init) (EVP_PKEY_CTX *ctx);
    int (*verify) (EVP_PKEY_CTX *ctx,
                   const unsigned char *sig, size_t siglen,
                   const unsigned char *tbs, size_t tbslen);
    int (*verify_recover_init) (EVP_PKEY_CTX *ctx);
    int (*verify_recover) (EVP_PKEY_CTX *ctx,
                           unsigned char *rout, size_t *routlen,
                           const unsigned char *sig, size_t siglen);
    int (*signctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
    int (*signctx) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
                    EVP_MD_CTX *mctx);
    int (*verifyctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
    int (*verifyctx) (EVP_PKEY_CTX *ctx, const unsigned char *sig, int siglen,
                      EVP_MD_CTX *mctx);
    int (*encrypt_init) (EVP_PKEY_CTX *ctx);
    int (*encrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
                    const unsigned char *in, size_t inlen);
    int (*decrypt_init) (EVP_PKEY_CTX *ctx);
    int (*decrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
                    const unsigned char *in, size_t inlen);
    int (*derive_init) (EVP_PKEY_CTX *ctx);
    int (*derive) (EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen);
    int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1, void *p2);
    int (*ctrl_str) (EVP_PKEY_CTX *ctx, const char *type, const char *value);
} /* EVP_PKEY_METHOD */ ;

DEFINE_STACK_OF_CONST(EVP_PKEY_METHOD)

void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx);

extern const EVP_PKEY_METHOD cmac_pkey_meth;
extern const EVP_PKEY_METHOD dh_pkey_meth;
extern const EVP_PKEY_METHOD dhx_pkey_meth;
extern const EVP_PKEY_METHOD dsa_pkey_meth;
extern const EVP_PKEY_METHOD ec_pkey_meth;
extern const EVP_PKEY_METHOD hmac_pkey_meth;
extern const EVP_PKEY_METHOD rsa_pkey_meth;
extern const EVP_PKEY_METHOD tls1_prf_pkey_meth;

struct evp_md_st {
    int type;
    int pkey_type;
    int md_size;
    unsigned long flags;
    int (*init) (EVP_MD_CTX *ctx);
    int (*update) (EVP_MD_CTX *ctx, const void *data, size_t count);
    int (*final) (EVP_MD_CTX *ctx, unsigned char *md);
    int (*copy) (EVP_MD_CTX *to, const EVP_MD_CTX *from);
    int (*cleanup) (EVP_MD_CTX *ctx);
    int block_size;
    int ctx_size;               /* how big does the ctx->md_data need to be */
    /* control function */
    int (*md_ctrl) (EVP_MD_CTX *ctx, int cmd, int p1, void *p2);
} /* EVP_MD */ ;

struct evp_cipher_st {
    int nid;
    int block_size;
    /* Default value for variable length ciphers */
    int key_len;
    int iv_len;
    /* Various flags */
    unsigned long flags;
    /* init key */
    int (*init) (EVP_CIPHER_CTX *ctx, const unsigned char *key,
                 const unsigned char *iv, int enc);
    /* encrypt/decrypt data */
    int (*do_cipher) (EVP_CIPHER_CTX *ctx, unsigned char *out,
                      const unsigned char *in, size_t inl);
    /* cleanup ctx */
    int (*cleanup) (EVP_CIPHER_CTX *);
    /* how big ctx->cipher_data needs to be */
    int ctx_size;
    /* Populate a ASN1_TYPE with parameters */
    int (*set_asn1_parameters) (EVP_CIPHER_CTX *, ASN1_TYPE *);
    /* Get parameters from a ASN1_TYPE */
    int (*get_asn1_parameters) (EVP_CIPHER_CTX *, ASN1_TYPE *);
    /* Miscellaneous operations */
    int (*ctrl) (EVP_CIPHER_CTX *, int type, int arg, void *ptr);
    /* Application data */
    void *app_data;
} /* EVP_CIPHER */ ;

/* Macros to code block cipher wrappers */

/* Wrapper functions for each cipher mode */

#define EVP_C_DATA(kstruct, ctx)   ((kstruct *)EVP_CIPHER_CTX_cipher_data(ctx))

#define BLOCK_CIPHER_ecb_loop() \
        size_t i, bl; \
        bl = EVP_CIPHER_CTX_cipher(ctx)->block_size;    \
        if(inl < bl) return 1;\
        inl -= bl; \
        for(i=0; i <= inl; i+=bl)

#define BLOCK_CIPHER_func_ecb(cname, cprefix, kstruct, ksched) \
static int cname##_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
{\
        BLOCK_CIPHER_ecb_loop() \
            cprefix##_ecb_encrypt(in + i, out + i, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_encrypting(ctx)); \
        return 1;\
}

#define EVP_MAXCHUNK ((size_t)1<<(sizeof(long)*8-2))

#define BLOCK_CIPHER_func_ofb(cname, cprefix, cbits, kstruct, ksched) \
    static int cname##_ofb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
{\
        while(inl>=EVP_MAXCHUNK) {\
            int num = EVP_CIPHER_CTX_num(ctx);\
            cprefix##_ofb##cbits##_encrypt(in, out, (long)EVP_MAXCHUNK, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), &num); \
            EVP_CIPHER_CTX_set_num(ctx, num);\
            inl-=EVP_MAXCHUNK;\
            in +=EVP_MAXCHUNK;\
            out+=EVP_MAXCHUNK;\
        }\
        if (inl) {\
            int num = EVP_CIPHER_CTX_num(ctx);\
            cprefix##_ofb##cbits##_encrypt(in, out, (long)inl, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), &num); \
            EVP_CIPHER_CTX_set_num(ctx, num);\
        }\
        return 1;\
}

#define BLOCK_CIPHER_func_cbc(cname, cprefix, kstruct, ksched) \
static int cname##_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
{\
        while(inl>=EVP_MAXCHUNK) \
            {\
            cprefix##_cbc_encrypt(in, out, (long)EVP_MAXCHUNK, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));\
            inl-=EVP_MAXCHUNK;\
            in +=EVP_MAXCHUNK;\
            out+=EVP_MAXCHUNK;\
            }\
        if (inl)\
            cprefix##_cbc_encrypt(in, out, (long)inl, &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), EVP_CIPHER_CTX_encrypting(ctx));\
        return 1;\
}

#define BLOCK_CIPHER_func_cfb(cname, cprefix, cbits, kstruct, ksched)  \
static int cname##_cfb##cbits##_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl) \
{\
        size_t chunk=EVP_MAXCHUNK;\
        if (cbits==1)  chunk>>=3;\
        if (inl<chunk) chunk=inl;\
        while(inl && inl>=chunk)\
            {\
            int num = EVP_CIPHER_CTX_num(ctx);\
            cprefix##_cfb##cbits##_encrypt(in, out, (long)((cbits==1) && !EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS) ?inl*8:inl), &EVP_C_DATA(kstruct,ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx), &num, EVP_CIPHER_CTX_encrypting(ctx)); \
            EVP_CIPHER_CTX_set_num(ctx, num);\
            inl-=chunk;\
            in +=chunk;\
            out+=chunk;\
            if(inl<chunk) chunk=inl;\
            }\
        return 1;\
}

#define BLOCK_CIPHER_all_funcs(cname, cprefix, cbits, kstruct, ksched) \
        BLOCK_CIPHER_func_cbc(cname, cprefix, kstruct, ksched) \
        BLOCK_CIPHER_func_cfb(cname, cprefix, cbits, kstruct, ksched) \
        BLOCK_CIPHER_func_ecb(cname, cprefix, kstruct, ksched) \
        BLOCK_CIPHER_func_ofb(cname, cprefix, cbits, kstruct, ksched)

#define BLOCK_CIPHER_def1(cname, nmode, mode, MODE, kstruct, nid, block_size, \
                          key_len, iv_len, flags, init_key, cleanup, \
                          set_asn1, get_asn1, ctrl) \
static const EVP_CIPHER cname##_##mode = { \
        nid##_##nmode, block_size, key_len, iv_len, \
        flags | EVP_CIPH_##MODE##_MODE, \
        init_key, \
        cname##_##mode##_cipher, \
        cleanup, \
        sizeof(kstruct), \
        set_asn1, get_asn1,\
        ctrl, \
        NULL \
}; \
const EVP_CIPHER *EVP_##cname##_##mode(void) { return &cname##_##mode; }

#define BLOCK_CIPHER_def_cbc(cname, kstruct, nid, block_size, key_len, \
                             iv_len, flags, init_key, cleanup, set_asn1, \
                             get_asn1, ctrl) \
BLOCK_CIPHER_def1(cname, cbc, cbc, CBC, kstruct, nid, block_size, key_len, \
                  iv_len, flags, init_key, cleanup, set_asn1, get_asn1, ctrl)

#define BLOCK_CIPHER_def_cfb(cname, kstruct, nid, key_len, \
                             iv_len, cbits, flags, init_key, cleanup, \
                             set_asn1, get_asn1, ctrl) \
BLOCK_CIPHER_def1(cname, cfb##cbits, cfb##cbits, CFB, kstruct, nid, 1, \
                  key_len, iv_len, flags, init_key, cleanup, set_asn1, \
                  get_asn1, ctrl)

#define BLOCK_CIPHER_def_ofb(cname, kstruct, nid, key_len, \
                             iv_len, cbits, flags, init_key, cleanup, \
                             set_asn1, get_asn1, ctrl) \
BLOCK_CIPHER_def1(cname, ofb##cbits, ofb, OFB, kstruct, nid, 1, \
                  key_len, iv_len, flags, init_key, cleanup, set_asn1, \
                  get_asn1, ctrl)

#define BLOCK_CIPHER_def_ecb(cname, kstruct, nid, block_size, key_len, \
                             flags, init_key, cleanup, set_asn1, \
                             get_asn1, ctrl) \
BLOCK_CIPHER_def1(cname, ecb, ecb, ECB, kstruct, nid, block_size, key_len, \
                  0, flags, init_key, cleanup, set_asn1, get_asn1, ctrl)

#define BLOCK_CIPHER_defs(cname, kstruct, \
                          nid, block_size, key_len, iv_len, cbits, flags, \
                          init_key, cleanup, set_asn1, get_asn1, ctrl) \
BLOCK_CIPHER_def_cbc(cname, kstruct, nid, block_size, key_len, iv_len, flags, \
                     init_key, cleanup, set_asn1, get_asn1, ctrl) \
BLOCK_CIPHER_def_cfb(cname, kstruct, nid, key_len, iv_len, cbits, \
                     flags, init_key, cleanup, set_asn1, get_asn1, ctrl) \
BLOCK_CIPHER_def_ofb(cname, kstruct, nid, key_len, iv_len, cbits, \
                     flags, init_key, cleanup, set_asn1, get_asn1, ctrl) \
BLOCK_CIPHER_def_ecb(cname, kstruct, nid, block_size, key_len, flags, \
                     init_key, cleanup, set_asn1, get_asn1, ctrl)

/*-
#define BLOCK_CIPHER_defs(cname, kstruct, \
                                nid, block_size, key_len, iv_len, flags,\
                                 init_key, cleanup, set_asn1, get_asn1, ctrl)\
static const EVP_CIPHER cname##_cbc = {\
        nid##_cbc, block_size, key_len, iv_len, \
        flags | EVP_CIPH_CBC_MODE,\
        init_key,\
        cname##_cbc_cipher,\
        cleanup,\
        sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
                sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
        set_asn1, get_asn1,\
        ctrl, \
        NULL \
};\
const EVP_CIPHER *EVP_##cname##_cbc(void) { return &cname##_cbc; }\
static const EVP_CIPHER cname##_cfb = {\
        nid##_cfb64, 1, key_len, iv_len, \
        flags | EVP_CIPH_CFB_MODE,\
        init_key,\
        cname##_cfb_cipher,\
        cleanup,\
        sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
                sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
        set_asn1, get_asn1,\
        ctrl,\
        NULL \
};\
const EVP_CIPHER *EVP_##cname##_cfb(void) { return &cname##_cfb; }\
static const EVP_CIPHER cname##_ofb = {\
        nid##_ofb64, 1, key_len, iv_len, \
        flags | EVP_CIPH_OFB_MODE,\
        init_key,\
        cname##_ofb_cipher,\
        cleanup,\
        sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
                sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
        set_asn1, get_asn1,\
        ctrl,\
        NULL \
};\
const EVP_CIPHER *EVP_##cname##_ofb(void) { return &cname##_ofb; }\
static const EVP_CIPHER cname##_ecb = {\
        nid##_ecb, block_size, key_len, iv_len, \
        flags | EVP_CIPH_ECB_MODE,\
        init_key,\
        cname##_ecb_cipher,\
        cleanup,\
        sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+\
                sizeof((((EVP_CIPHER_CTX *)NULL)->c.kstruct)),\
        set_asn1, get_asn1,\
        ctrl,\
        NULL \
};\
const EVP_CIPHER *EVP_##cname##_ecb(void) { return &cname##_ecb; }
*/

#define IMPLEMENT_BLOCK_CIPHER(cname, ksched, cprefix, kstruct, nid, \
                               block_size, key_len, iv_len, cbits, \
                               flags, init_key, \
                               cleanup, set_asn1, get_asn1, ctrl) \
        BLOCK_CIPHER_all_funcs(cname, cprefix, cbits, kstruct, ksched) \
        BLOCK_CIPHER_defs(cname, kstruct, nid, block_size, key_len, iv_len, \
                          cbits, flags, init_key, cleanup, set_asn1, \
                          get_asn1, ctrl)

#define IMPLEMENT_CFBR(cipher,cprefix,kstruct,ksched,keysize,cbits,iv_len,fl) \
        BLOCK_CIPHER_func_cfb(cipher##_##keysize,cprefix,cbits,kstruct,ksched) \
        BLOCK_CIPHER_def_cfb(cipher##_##keysize,kstruct, \
                             NID_##cipher##_##keysize, keysize/8, iv_len, cbits, \
                             (fl)|EVP_CIPH_FLAG_DEFAULT_ASN1, \
                             cipher##_init_key, NULL, NULL, NULL, NULL)