| /* |
| * Copyright (c) 2015, Google Inc. |
| * |
| * (C) Copyright 2008 Semihalf |
| * |
| * (C) Copyright 2000-2006 |
| * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #ifndef _RSA_IMX_H |
| #define _RSA_IMX_H |
| |
| #include <errno.h> |
| #include <image.h> |
| |
| /* This is the minimum/maximum key size we support, in bits */ |
| #define RSA_MIN_KEY_BITS 2048 |
| #define RSA_MAX_KEY_BITS 2048 |
| |
| /** |
| * struct rsa_public_key - holder for a public key |
| * |
| * An RSA public key consists of a modulus (typically called N), the inverse |
| * and R^2, where R is 2^(# key bits). |
| */ |
| struct rsa_public_key { |
| uint len; /* Length of modulus[] in number of uint32_t */ |
| uint32_t n0inv; /* -1 / modulus[0] mod 2^32 */ |
| uint32_t modulus[RSA_MAX_KEY_BITS / (sizeof(uint32_t) * 8)]; /* modulus as little endian array */ |
| uint32_t rr[RSA_MAX_KEY_BITS / (sizeof(uint32_t) * 8)]; /* R^2 as little endian array */ |
| }; |
| |
| /** |
| * rsa_imx_get_key() - Get an RSA public key from an FDT |
| * |
| * @fdt_blob: FDT pointer |
| * @node: Node index into FDT |
| * @key: Pointer to public key structure |
| * @return 0 if verified, -ve on error |
| */ |
| int rsa_imx_get_key(const void *fdt_blob, int node, struct rsa_public_key *key); |
| |
| /** |
| * rsa_imx_verify_key() - Decrypt sig using an RSA public key and verify the padding and hash match |
| * |
| * @fdt_blob: FDT pointer |
| * @node: Node index into FDT |
| * @key: Pointer to public key structure |
| * @return 0 if verified, -ve on error |
| */ |
| int rsa_imx_verify_key(const struct rsa_public_key *key, const uint8_t *sig, |
| const uint32_t sig_len, const uint8_t *hash); |
| |
| #if IMAGE_ENABLE_SIGN |
| |
| /** |
| * sign() - calculate and return signature for given input data |
| * |
| * @info: Specifies key and FIT information |
| * @data: Pointer to the input data |
| * @data_len: Data length |
| * @sigp: Set to an allocated buffer holding the signature |
| * @sig_len: Set to length of the calculated hash |
| * |
| * This computes input data signature according to selected algorithm. |
| * Resulting signature value is placed in an allocated buffer, the |
| * pointer is returned as *sigp. The length of the calculated |
| * signature is returned via the sig_len pointer argument. The caller |
| * should free *sigp. |
| * |
| * @return: 0, on success, -ve on error |
| */ |
| int rsa_imx_sign(struct image_sign_info *info, |
| const struct image_region region[], |
| int region_count, uint8_t **sigp, uint *sig_len); |
| |
| /** |
| * add_verify_data() - Add verification information to FDT |
| * |
| * Add public key information to the FDT node, suitable for |
| * verification at run-time. The information added depends on the |
| * algorithm being used. |
| * |
| * @info: Specifies key and FIT information |
| * @keydest: Destination FDT blob for public key data |
| * @return: 0, on success, -ve on error |
| */ |
| int rsa_imx_add_verify_data(struct image_sign_info *info, void *keydest); |
| #else |
| static inline int rsa_imx_sign(struct image_sign_info *info, |
| const struct image_region region[], int region_count, |
| uint8_t **sigp, uint *sig_len) |
| { |
| return -ENXIO; |
| } |
| |
| static inline int rsa_imx_add_verify_data(struct image_sign_info *info, |
| void *keydest) |
| { |
| return -ENXIO; |
| } |
| #endif |
| |
| #if IMAGE_ENABLE_VERIFY |
| /** |
| * rsa_verify() - Verify a signature against some data |
| * |
| * Verify a RSA PKCS1.5 signature against an expected hash. |
| * |
| * @info: Specifies key and FIT information |
| * @data: Pointer to the input data |
| * @data_len: Data length |
| * @sig: Signature |
| * @sig_len: Number of bytes in signature |
| * @return 0 if verified, -ve on error |
| */ |
| int rsa_imx_verify(struct image_sign_info *info, |
| const struct image_region region[], int region_count, |
| uint8_t *sig, uint sig_len); |
| #else |
| static inline int rsa_imx_verify(struct image_sign_info *info, |
| const struct image_region region[], int region_count, |
| uint8_t *sig, uint sig_len) |
| { |
| return -ENXIO; |
| } |
| #endif |
| |
| #endif |