diff options
author | Richard Levitte <levitte@openssl.org> | 2015-12-18 16:37:02 +0100 |
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committer | Richard Levitte <levitte@openssl.org> | 2016-01-12 13:52:22 +0100 |
commit | e79f877333dcdc2ca51442d8339253e29c31a0d6 (patch) | |
tree | 111a3e888f198f68f01cb03e27bd7842afdf5f35 /crypto/include | |
parent | 480d33237df3894ea8df6f2a2e2076fa30efb205 (diff) |
Make EVP_CIPHER opaque and add creator/destructor/accessor/writer functions
We follow the method used for EVP_MD.
Also, move all the internal EVP_CIPHER building macros from evp_locl.h
to evp_int.h. This will benefit our builtin EVP_CIPHERs.
Reviewed-by: Rich Salz <rsalz@openssl.org>
Diffstat (limited to 'crypto/include')
-rw-r--r-- | crypto/include/internal/evp_int.h | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/crypto/include/internal/evp_int.h b/crypto/include/internal/evp_int.h index 329f1ae355..e6be4323c2 100644 --- a/crypto/include/internal/evp_int.h +++ b/crypto/include/internal/evp_int.h @@ -148,3 +148,241 @@ struct evp_md_st { 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) + |