Bootloader crypto functions

Data Structures
struct	bl_rot_verify_ext_api
	Structure describing the BL_ROT_VERIFY EXT_API. More...
struct	bl_sha256_ext_api
	Structure describing the BL_SHA256 EXT_API. More...
struct	bl_secp256r1_ext_api
	Structure describing the BL_SECP256R1 EXT_API. More...

Macros
#define	EHASHINV   101
#define	ESIGINV   102
#define	SHA256_CTX_SIZE   256

Typedefs
typedef uint32_t	bl_sha256_ctx_t[256/4]
typedef int(*	bl_root_of_trust_verify_t) (const uint8_t *public_key, const uint8_t *public_key_hash, const uint8_t *signature, const uint8_t *firmware, const uint32_t firmware_len)
typedef int(*	bl_sha256_init_t) (bl_sha256_ctx_t *ctx)
typedef int(*	bl_sha256_update_t) (bl_sha256_ctx_t *ctx, const uint8_t *data, uint32_t data_len)
typedef int(*	bl_sha256_finalize_t) (bl_sha256_ctx_t *ctx, uint8_t *output)
typedef int(*	bl_sha256_verify_t) (const uint8_t *data, uint32_t data_len, const uint8_t *expected)
typedef int(*	bl_secp256r1_validate_t) (const uint8_t *hash, uint32_t hash_len, const uint8_t *public_key, const uint8_t *signature)

Functions
int	bl_crypto_init (void)
	Initialize bootloader crypto module.
int	bl_root_of_trust_verify (const uint8_t *public_key, const uint8_t *public_key_hash, const uint8_t *signature, const uint8_t *firmware, const uint32_t firmware_len)
	Verify a signature using configured signature and SHA-256.
int	bl_root_of_trust_verify_external (const uint8_t *public_key, const uint8_t *public_key_hash, const uint8_t *signature, const uint8_t *firmware, const uint32_t firmware_len)
	Implementation of rot_verify that is safe to be called from EXT_API.
void	bl_root_of_trust_housekeeping (void)
	Perform root of trust housekeeping operations.
int	bl_sha256_init (bl_sha256_ctx_t *ctx)
	Initialize a sha256 operation context variable.
int	bl_sha256_update (bl_sha256_ctx_t *ctx, const uint8_t *data, uint32_t data_len)
	Hash a portion of data.
int	bl_sha256_finalize (bl_sha256_ctx_t *ctx, uint8_t *output)
	Finalize a hash result.
int	bl_sha256_verify (const uint8_t *data, uint32_t data_len, const uint8_t *expected)
	Calculate a digest and verify it directly.
int	bl_secp256r1_validate (const uint8_t *hash, uint32_t hash_len, const uint8_t *public_key, const uint8_t *signature)
	Validate a secp256r1 signature.
int	bl_ed25519_validate (const uint8_t *hash, uint32_t hash_len, const uint8_t *signature)
	Validate an ed25519 signature.
void	bl_ed25519_keys_housekeeping (void)
	Perform ED25519 key storage housekeeping operations.

Detailed Description