include/linux/ccp.h

   1 /*
   2  * AMD Cryptographic Coprocessor (CCP) driver
   3  *
   4  * Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
   5  *
   6  * Author: Tom Lendacky <thomas.lendacky@amd.com>
   7  * Author: Gary R Hook <gary.hook@amd.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #ifndef __CCP_H__
  15 #define __CCP_H__
  16
  17 #include <linux/scatterlist.h>
  18 #include <linux/workqueue.h>
  19 #include <linux/list.h>
  20 #include <crypto/aes.h>
  21 #include <crypto/sha.h>
  22
  23
  24 struct ccp_device;
  25 struct ccp_cmd;
  26
  27 #if defined(CONFIG_CRYPTO_DEV_CCP_DD) || \
  28         defined(CONFIG_CRYPTO_DEV_CCP_DD_MODULE)
  29
  30 /**
  31  * ccp_present - check if a CCP device is present
  32  *
  33  * Returns zero if a CCP device is present, -ENODEV otherwise.
  34  */
  35 int ccp_present(void);
  36
  37 #define CCP_VSIZE 16
  38 #define CCP_VMASK               ((unsigned int)((1 << CCP_VSIZE) - 1))
  39 #define CCP_VERSION(v, r)       ((unsigned int)((v << CCP_VSIZE) \
  40                                                | (r & CCP_VMASK)))
  41
  42 /**
  43  * ccp_version - get the version of the CCP
  44  *
  45  * Returns a positive version number, or zero if no CCP
  46  */
  47 unsigned int ccp_version(void);
  48
  49 /**
  50  * ccp_enqueue_cmd - queue an operation for processing by the CCP
  51  *
  52  * @cmd: ccp_cmd struct to be processed
  53  *
  54  * Refer to the ccp_cmd struct below for required fields.
  55  *
  56  * Queue a cmd to be processed by the CCP. If queueing the cmd
  57  * would exceed the defined length of the cmd queue the cmd will
  58  * only be queued if the CCP_CMD_MAY_BACKLOG flag is set and will
  59  * result in a return code of -EBUSY.
  60  *
  61  * The callback routine specified in the ccp_cmd struct will be
  62  * called to notify the caller of completion (if the cmd was not
  63  * backlogged) or advancement out of the backlog. If the cmd has
  64  * advanced out of the backlog the "err" value of the callback
  65  * will be -EINPROGRESS. Any other "err" value during callback is
  66  * the result of the operation.
  67  *
  68  * The cmd has been successfully queued if:
  69  *   the return code is -EINPROGRESS or
  70  *   the return code is -EBUSY and CCP_CMD_MAY_BACKLOG flag is set
  71  */
  72 int ccp_enqueue_cmd(struct ccp_cmd *cmd);
  73
  74 #else /* CONFIG_CRYPTO_DEV_CCP_DD is not enabled */
  75
  76 static inline int ccp_present(void)
  77 {
  78         return -ENODEV;
  79 }
  80
  81 static inline unsigned int ccp_version(void)
  82 {
  83         return 0;
  84 }
  85
  86 static inline int ccp_enqueue_cmd(struct ccp_cmd *cmd)
  87 {
  88         return -ENODEV;
  89 }
  90
  91 #endif /* CONFIG_CRYPTO_DEV_CCP_DD */
  92
  93
  94 /***** AES engine *****/
  95 /**
  96  * ccp_aes_type - AES key size
  97  *
  98  * @CCP_AES_TYPE_128: 128-bit key
  99  * @CCP_AES_TYPE_192: 192-bit key
 100  * @CCP_AES_TYPE_256: 256-bit key
 101  */
 102 enum ccp_aes_type {
 103         CCP_AES_TYPE_128 = 0,
 104         CCP_AES_TYPE_192,
 105         CCP_AES_TYPE_256,
 106         CCP_AES_TYPE__LAST,
 107 };
 108
 109 /**
 110  * ccp_aes_mode - AES operation mode
 111  *
 112  * @CCP_AES_MODE_ECB: ECB mode
 113  * @CCP_AES_MODE_CBC: CBC mode
 114  * @CCP_AES_MODE_OFB: OFB mode
 115  * @CCP_AES_MODE_CFB: CFB mode
 116  * @CCP_AES_MODE_CTR: CTR mode
 117  * @CCP_AES_MODE_CMAC: CMAC mode
 118  */
 119 enum ccp_aes_mode {
 120         CCP_AES_MODE_ECB = 0,
 121         CCP_AES_MODE_CBC,
 122         CCP_AES_MODE_OFB,
 123         CCP_AES_MODE_CFB,
 124         CCP_AES_MODE_CTR,
 125         CCP_AES_MODE_CMAC,
 126         CCP_AES_MODE__LAST,
 127 };
 128
 129 /**
 130  * ccp_aes_mode - AES operation mode
 131  *
 132  * @CCP_AES_ACTION_DECRYPT: AES decrypt operation
 133  * @CCP_AES_ACTION_ENCRYPT: AES encrypt operation
 134  */
 135 enum ccp_aes_action {
 136         CCP_AES_ACTION_DECRYPT = 0,
 137         CCP_AES_ACTION_ENCRYPT,
 138         CCP_AES_ACTION__LAST,
 139 };
 140
 141 /**
 142  * struct ccp_aes_engine - CCP AES operation
 143  * @type: AES operation key size
 144  * @mode: AES operation mode
 145  * @action: AES operation (decrypt/encrypt)
 146  * @key: key to be used for this AES operation
 147  * @key_len: length in bytes of key
 148  * @iv: IV to be used for this AES operation
 149  * @iv_len: length in bytes of iv
 150  * @src: data to be used for this operation
 151  * @dst: data produced by this operation
 152  * @src_len: length in bytes of data used for this operation
 153  * @cmac_final: indicates final operation when running in CMAC mode
 154  * @cmac_key: K1/K2 key used in final CMAC operation
 155  * @cmac_key_len: length in bytes of cmac_key
 156  *
 157  * Variables required to be set when calling ccp_enqueue_cmd():
 158  *   - type, mode, action, key, key_len, src, dst, src_len
 159  *   - iv, iv_len for any mode other than ECB
 160  *   - cmac_final for CMAC mode
 161  *   - cmac_key, cmac_key_len for CMAC mode if cmac_final is non-zero
 162  *
 163  * The iv variable is used as both input and output. On completion of the
 164  * AES operation the new IV overwrites the old IV.
 165  */
 166 struct ccp_aes_engine {
 167         enum ccp_aes_type type;
 168         enum ccp_aes_mode mode;
 169         enum ccp_aes_action action;
 170
 171         struct scatterlist *key;
 172         u32 key_len;            /* In bytes */
 173
 174         struct scatterlist *iv;
 175         u32 iv_len;             /* In bytes */
 176
 177         struct scatterlist *src, *dst;
 178         u64 src_len;            /* In bytes */
 179
 180         u32 cmac_final;         /* Indicates final cmac cmd */
 181         struct scatterlist *cmac_key;   /* K1/K2 cmac key required for
 182                                          * final cmac cmd */
 183         u32 cmac_key_len;       /* In bytes */
 184 };
 185
 186 /***** XTS-AES engine *****/
 187 /**
 188  * ccp_xts_aes_unit_size - XTS unit size
 189  *
 190  * @CCP_XTS_AES_UNIT_SIZE_16: Unit size of 16 bytes
 191  * @CCP_XTS_AES_UNIT_SIZE_512: Unit size of 512 bytes
 192  * @CCP_XTS_AES_UNIT_SIZE_1024: Unit size of 1024 bytes
 193  * @CCP_XTS_AES_UNIT_SIZE_2048: Unit size of 2048 bytes
 194  * @CCP_XTS_AES_UNIT_SIZE_4096: Unit size of 4096 bytes
 195  */
 196 enum ccp_xts_aes_unit_size {
 197         CCP_XTS_AES_UNIT_SIZE_16 = 0,
 198         CCP_XTS_AES_UNIT_SIZE_512,
 199         CCP_XTS_AES_UNIT_SIZE_1024,
 200         CCP_XTS_AES_UNIT_SIZE_2048,
 201         CCP_XTS_AES_UNIT_SIZE_4096,
 202         CCP_XTS_AES_UNIT_SIZE__LAST,
 203 };
 204
 205 /**
 206  * struct ccp_xts_aes_engine - CCP XTS AES operation
 207  * @action: AES operation (decrypt/encrypt)
 208  * @unit_size: unit size of the XTS operation
 209  * @key: key to be used for this XTS AES operation
 210  * @key_len: length in bytes of key
 211  * @iv: IV to be used for this XTS AES operation
 212  * @iv_len: length in bytes of iv
 213  * @src: data to be used for this operation
 214  * @dst: data produced by this operation
 215  * @src_len: length in bytes of data used for this operation
 216  * @final: indicates final XTS operation
 217  *
 218  * Variables required to be set when calling ccp_enqueue_cmd():
 219  *   - action, unit_size, key, key_len, iv, iv_len, src, dst, src_len, final
 220  *
 221  * The iv variable is used as both input and output. On completion of the
 222  * AES operation the new IV overwrites the old IV.
 223  */
 224 struct ccp_xts_aes_engine {
 225         enum ccp_aes_action action;
 226         enum ccp_xts_aes_unit_size unit_size;
 227
 228         struct scatterlist *key;
 229         u32 key_len;            /* In bytes */
 230
 231         struct scatterlist *iv;
 232         u32 iv_len;             /* In bytes */
 233
 234         struct scatterlist *src, *dst;
 235         u64 src_len;            /* In bytes */
 236
 237         u32 final;
 238 };
 239
 240 /***** SHA engine *****/
 241 /**
 242  * ccp_sha_type - type of SHA operation
 243  *
 244  * @CCP_SHA_TYPE_1: SHA-1 operation
 245  * @CCP_SHA_TYPE_224: SHA-224 operation
 246  * @CCP_SHA_TYPE_256: SHA-256 operation
 247  */
 248 enum ccp_sha_type {
 249         CCP_SHA_TYPE_1 = 1,
 250         CCP_SHA_TYPE_224,
 251         CCP_SHA_TYPE_256,
 252         CCP_SHA_TYPE__LAST,
 253 };
 254
 255 /**
 256  * struct ccp_sha_engine - CCP SHA operation
 257  * @type: Type of SHA operation
 258  * @ctx: current hash value
 259  * @ctx_len: length in bytes of hash value
 260  * @src: data to be used for this operation
 261  * @src_len: length in bytes of data used for this operation
 262  * @opad: data to be used for final HMAC operation
 263  * @opad_len: length in bytes of data used for final HMAC operation
 264  * @first: indicates first SHA operation
 265  * @final: indicates final SHA operation
 266  * @msg_bits: total length of the message in bits used in final SHA operation
 267  *
 268  * Variables required to be set when calling ccp_enqueue_cmd():
 269  *   - type, ctx, ctx_len, src, src_len, final
 270  *   - msg_bits if final is non-zero
 271  *
 272  * The ctx variable is used as both input and output. On completion of the
 273  * SHA operation the new hash value overwrites the old hash value.
 274  */
 275 struct ccp_sha_engine {
 276         enum ccp_sha_type type;
 277
 278         struct scatterlist *ctx;
 279         u32 ctx_len;            /* In bytes */
 280
 281         struct scatterlist *src;
 282         u64 src_len;            /* In bytes */
 283
 284         struct scatterlist *opad;
 285         u32 opad_len;           /* In bytes */
 286
 287         u32 first;              /* Indicates first sha cmd */
 288         u32 final;              /* Indicates final sha cmd */
 289         u64 msg_bits;           /* Message length in bits required for
 290                                  * final sha cmd */
 291 };
 292
 293 /***** RSA engine *****/
 294 /**
 295  * struct ccp_rsa_engine - CCP RSA operation
 296  * @key_size: length in bits of RSA key
 297  * @exp: RSA exponent
 298  * @exp_len: length in bytes of exponent
 299  * @mod: RSA modulus
 300  * @mod_len: length in bytes of modulus
 301  * @src: data to be used for this operation
 302  * @dst: data produced by this operation
 303  * @src_len: length in bytes of data used for this operation
 304  *
 305  * Variables required to be set when calling ccp_enqueue_cmd():
 306  *   - key_size, exp, exp_len, mod, mod_len, src, dst, src_len
 307  */
 308 struct ccp_rsa_engine {
 309         u32 key_size;           /* In bits */
 310
 311         struct scatterlist *exp;
 312         u32 exp_len;            /* In bytes */
 313
 314         struct scatterlist *mod;
 315         u32 mod_len;            /* In bytes */
 316
 317         struct scatterlist *src, *dst;
 318         u32 src_len;            /* In bytes */
 319 };
 320
 321 /***** Passthru engine *****/
 322 /**
 323  * ccp_passthru_bitwise - type of bitwise passthru operation
 324  *
 325  * @CCP_PASSTHRU_BITWISE_NOOP: no bitwise operation performed
 326  * @CCP_PASSTHRU_BITWISE_AND: perform bitwise AND of src with mask
 327  * @CCP_PASSTHRU_BITWISE_OR: perform bitwise OR of src with mask
 328  * @CCP_PASSTHRU_BITWISE_XOR: perform bitwise XOR of src with mask
 329  * @CCP_PASSTHRU_BITWISE_MASK: overwrite with mask
 330  */
 331 enum ccp_passthru_bitwise {
 332         CCP_PASSTHRU_BITWISE_NOOP = 0,
 333         CCP_PASSTHRU_BITWISE_AND,
 334         CCP_PASSTHRU_BITWISE_OR,
 335         CCP_PASSTHRU_BITWISE_XOR,
 336         CCP_PASSTHRU_BITWISE_MASK,
 337         CCP_PASSTHRU_BITWISE__LAST,
 338 };
 339
 340 /**
 341  * ccp_passthru_byteswap - type of byteswap passthru operation
 342  *
 343  * @CCP_PASSTHRU_BYTESWAP_NOOP: no byte swapping performed
 344  * @CCP_PASSTHRU_BYTESWAP_32BIT: swap bytes within 32-bit words
 345  * @CCP_PASSTHRU_BYTESWAP_256BIT: swap bytes within 256-bit words
 346  */
 347 enum ccp_passthru_byteswap {
 348         CCP_PASSTHRU_BYTESWAP_NOOP = 0,
 349         CCP_PASSTHRU_BYTESWAP_32BIT,
 350         CCP_PASSTHRU_BYTESWAP_256BIT,
 351         CCP_PASSTHRU_BYTESWAP__LAST,
 352 };
 353
 354 /**
 355  * struct ccp_passthru_engine - CCP pass-through operation
 356  * @bit_mod: bitwise operation to perform
 357  * @byte_swap: byteswap operation to perform
 358  * @mask: mask to be applied to data
 359  * @mask_len: length in bytes of mask
 360  * @src: data to be used for this operation
 361  * @dst: data produced by this operation
 362  * @src_len: length in bytes of data used for this operation
 363  * @final: indicate final pass-through operation
 364  *
 365  * Variables required to be set when calling ccp_enqueue_cmd():
 366  *   - bit_mod, byte_swap, src, dst, src_len
 367  *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 368  */
 369 struct ccp_passthru_engine {
 370         enum ccp_passthru_bitwise bit_mod;
 371         enum ccp_passthru_byteswap byte_swap;
 372
 373         struct scatterlist *mask;
 374         u32 mask_len;           /* In bytes */
 375
 376         struct scatterlist *src, *dst;
 377         u64 src_len;            /* In bytes */
 378
 379         u32 final;
 380 };
 381
 382 /**
 383  * struct ccp_passthru_nomap_engine - CCP pass-through operation
 384  *   without performing DMA mapping
 385  * @bit_mod: bitwise operation to perform
 386  * @byte_swap: byteswap operation to perform
 387  * @mask: mask to be applied to data
 388  * @mask_len: length in bytes of mask
 389  * @src: data to be used for this operation
 390  * @dst: data produced by this operation
 391  * @src_len: length in bytes of data used for this operation
 392  * @final: indicate final pass-through operation
 393  *
 394  * Variables required to be set when calling ccp_enqueue_cmd():
 395  *   - bit_mod, byte_swap, src, dst, src_len
 396  *   - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
 397  */
 398 struct ccp_passthru_nomap_engine {
 399         enum ccp_passthru_bitwise bit_mod;
 400         enum ccp_passthru_byteswap byte_swap;
 401
 402         dma_addr_t mask;
 403         u32 mask_len;           /* In bytes */
 404
 405         dma_addr_t src_dma, dst_dma;
 406         u64 src_len;            /* In bytes */
 407
 408         u32 final;
 409 };
 410
 411 /***** ECC engine *****/
 412 #define CCP_ECC_MODULUS_BYTES   48      /* 384-bits */
 413 #define CCP_ECC_MAX_OPERANDS    6
 414 #define CCP_ECC_MAX_OUTPUTS     3
 415
 416 /**
 417  * ccp_ecc_function - type of ECC function
 418  *
 419  * @CCP_ECC_FUNCTION_MMUL_384BIT: 384-bit modular multiplication
 420  * @CCP_ECC_FUNCTION_MADD_384BIT: 384-bit modular addition
 421  * @CCP_ECC_FUNCTION_MINV_384BIT: 384-bit multiplicative inverse
 422  * @CCP_ECC_FUNCTION_PADD_384BIT: 384-bit point addition
 423  * @CCP_ECC_FUNCTION_PMUL_384BIT: 384-bit point multiplication
 424  * @CCP_ECC_FUNCTION_PDBL_384BIT: 384-bit point doubling
 425  */
 426 enum ccp_ecc_function {
 427         CCP_ECC_FUNCTION_MMUL_384BIT = 0,
 428         CCP_ECC_FUNCTION_MADD_384BIT,
 429         CCP_ECC_FUNCTION_MINV_384BIT,
 430         CCP_ECC_FUNCTION_PADD_384BIT,
 431         CCP_ECC_FUNCTION_PMUL_384BIT,
 432         CCP_ECC_FUNCTION_PDBL_384BIT,
 433 };
 434
 435 /**
 436  * struct ccp_ecc_modular_math - CCP ECC modular math parameters
 437  * @operand_1: first operand for the modular math operation
 438  * @operand_1_len: length of the first operand
 439  * @operand_2: second operand for the modular math operation
 440  *             (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 441  * @operand_2_len: length of the second operand
 442  *             (not used for CCP_ECC_FUNCTION_MINV_384BIT)
 443  * @result: result of the modular math operation
 444  * @result_len: length of the supplied result buffer
 445  */
 446 struct ccp_ecc_modular_math {
 447         struct scatterlist *operand_1;
 448         unsigned int operand_1_len;     /* In bytes */
 449
 450         struct scatterlist *operand_2;
 451         unsigned int operand_2_len;     /* In bytes */
 452
 453         struct scatterlist *result;
 454         unsigned int result_len;        /* In bytes */
 455 };
 456
 457 /**
 458  * struct ccp_ecc_point - CCP ECC point definition
 459  * @x: the x coordinate of the ECC point
 460  * @x_len: the length of the x coordinate
 461  * @y: the y coordinate of the ECC point
 462  * @y_len: the length of the y coordinate
 463  */
 464 struct ccp_ecc_point {
 465         struct scatterlist *x;
 466         unsigned int x_len;     /* In bytes */
 467
 468         struct scatterlist *y;
 469         unsigned int y_len;     /* In bytes */
 470 };
 471
 472 /**
 473  * struct ccp_ecc_point_math - CCP ECC point math parameters
 474  * @point_1: the first point of the ECC point math operation
 475  * @point_2: the second point of the ECC point math operation
 476  *           (only used for CCP_ECC_FUNCTION_PADD_384BIT)
 477  * @domain_a: the a parameter of the ECC curve
 478  * @domain_a_len: the length of the a parameter
 479  * @scalar: the scalar parameter for the point match operation
 480  *          (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 481  * @scalar_len: the length of the scalar parameter
 482  *              (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
 483  * @result: the point resulting from the point math operation
 484  */
 485 struct ccp_ecc_point_math {
 486         struct ccp_ecc_point point_1;
 487         struct ccp_ecc_point point_2;
 488
 489         struct scatterlist *domain_a;
 490         unsigned int domain_a_len;      /* In bytes */
 491
 492         struct scatterlist *scalar;
 493         unsigned int scalar_len;        /* In bytes */
 494
 495         struct ccp_ecc_point result;
 496 };
 497
 498 /**
 499  * struct ccp_ecc_engine - CCP ECC operation
 500  * @function: ECC function to perform
 501  * @mod: ECC modulus
 502  * @mod_len: length in bytes of modulus
 503  * @mm: module math parameters
 504  * @pm: point math parameters
 505  * @ecc_result: result of the ECC operation
 506  *
 507  * Variables required to be set when calling ccp_enqueue_cmd():
 508  *   - function, mod, mod_len
 509  *   - operand, operand_len, operand_count, output, output_len, output_count
 510  *   - ecc_result
 511  */
 512 struct ccp_ecc_engine {
 513         enum ccp_ecc_function function;
 514
 515         struct scatterlist *mod;
 516         u32 mod_len;            /* In bytes */
 517
 518         union {
 519                 struct ccp_ecc_modular_math mm;
 520                 struct ccp_ecc_point_math pm;
 521         } u;
 522
 523         u16 ecc_result;
 524 };
 525
 526
 527 /**
 528  * ccp_engine - CCP operation identifiers
 529  *
 530  * @CCP_ENGINE_AES: AES operation
 531  * @CCP_ENGINE_XTS_AES: 128-bit XTS AES operation
 532  * @CCP_ENGINE_RSVD1: unused
 533  * @CCP_ENGINE_SHA: SHA operation
 534  * @CCP_ENGINE_RSA: RSA operation
 535  * @CCP_ENGINE_PASSTHRU: pass-through operation
 536  * @CCP_ENGINE_ZLIB_DECOMPRESS: unused
 537  * @CCP_ENGINE_ECC: ECC operation
 538  */
 539 enum ccp_engine {
 540         CCP_ENGINE_AES = 0,
 541         CCP_ENGINE_XTS_AES_128,
 542         CCP_ENGINE_RSVD1,
 543         CCP_ENGINE_SHA,
 544         CCP_ENGINE_RSA,
 545         CCP_ENGINE_PASSTHRU,
 546         CCP_ENGINE_ZLIB_DECOMPRESS,
 547         CCP_ENGINE_ECC,
 548         CCP_ENGINE__LAST,
 549 };
 550
 551 /* Flag values for flags member of ccp_cmd */
 552 #define CCP_CMD_MAY_BACKLOG             0x00000001
 553 #define CCP_CMD_PASSTHRU_NO_DMA_MAP     0x00000002
 554
 555 /**
 556  * struct ccp_cmd - CCP operation request
 557  * @entry: list element (ccp driver use only)
 558  * @work: work element used for callbacks (ccp driver use only)
 559  * @ccp: CCP device to be run on (ccp driver use only)
 560  * @ret: operation return code (ccp driver use only)
 561  * @flags: cmd processing flags
 562  * @engine: CCP operation to perform
 563  * @engine_error: CCP engine return code
 564  * @u: engine specific structures, refer to specific engine struct below
 565  * @callback: operation completion callback function
 566  * @data: parameter value to be supplied to the callback function
 567  *
 568  * Variables required to be set when calling ccp_enqueue_cmd():
 569  *   - engine, callback
 570  *   - See the operation structures below for what is required for each
 571  *     operation.
 572  */
 573 struct ccp_cmd {
 574         /* The list_head, work_struct, ccp and ret variables are for use
 575          * by the CCP driver only.
 576          */
 577         struct list_head entry;
 578         struct work_struct work;
 579         struct ccp_device *ccp;
 580         int ret;
 581
 582         u32 flags;
 583
 584         enum ccp_engine engine;
 585         u32 engine_error;
 586
 587         union {
 588                 struct ccp_aes_engine aes;
 589                 struct ccp_xts_aes_engine xts;
 590                 struct ccp_sha_engine sha;
 591                 struct ccp_rsa_engine rsa;
 592                 struct ccp_passthru_engine passthru;
 593                 struct ccp_passthru_nomap_engine passthru_nomap;
 594                 struct ccp_ecc_engine ecc;
 595         } u;
 596
 597         /* Completion callback support */
 598         void (*callback)(void *data, int err);
 599         void *data;
 600 };
 601
 602 #endif