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#ifndef AWS_CAL_ECC_H #define AWS_CAL_ECC_H /** * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. * SPDX-License-Identifier: Apache-2.0. */ #include #include #include #include AWS_PUSH_SANE_WARNING_LEVEL enum aws_ecc_curve_name { AWS_CAL_ECDSA_P256, AWS_CAL_ECDSA_P384, }; struct aws_ecc_key_pair; typedef void aws_ecc_key_pair_destroy_fn(struct aws_ecc_key_pair *key_pair); typedef int aws_ecc_key_pair_sign_message_fn( const struct aws_ecc_key_pair *key_pair, const struct aws_byte_cursor *message, struct aws_byte_buf *signature_output); typedef int aws_ecc_key_pair_derive_public_key_fn(struct aws_ecc_key_pair *key_pair); typedef int aws_ecc_key_pair_verify_signature_fn( const struct aws_ecc_key_pair *signer, const struct aws_byte_cursor *message, const struct aws_byte_cursor *signature); typedef size_t aws_ecc_key_pair_signature_length_fn(const struct aws_ecc_key_pair *signer); struct aws_ecc_key_pair_vtable { aws_ecc_key_pair_destroy_fn *destroy; aws_ecc_key_pair_derive_public_key_fn *derive_pub_key; aws_ecc_key_pair_sign_message_fn *sign_message; aws_ecc_key_pair_verify_signature_fn *verify_signature; aws_ecc_key_pair_signature_length_fn *signature_length; }; struct aws_ecc_key_pair { struct aws_allocator *allocator; struct aws_atomic_var ref_count; enum aws_ecc_curve_name curve_name; struct aws_byte_buf key_buf; struct aws_byte_buf pub_x; struct aws_byte_buf pub_y; struct aws_byte_buf priv_d; struct aws_ecc_key_pair_vtable *vtable; void *impl; }; AWS_EXTERN_C_BEGIN /** * Adds one to an ecc key pair's ref count. */ AWS_CAL_API void aws_ecc_key_pair_acquire(struct aws_ecc_key_pair *key_pair); /** * Subtracts one from an ecc key pair's ref count. If ref count reaches zero, the key pair is destroyed. */ AWS_CAL_API void aws_ecc_key_pair_release(struct aws_ecc_key_pair *key_pair); /** * Creates an Elliptic Curve private key that can be used for signing. * Returns a new instance of aws_ecc_key_pair if the key was successfully built. * Otherwise returns NULL. Note: priv_key::len must match the appropriate length * for the selected curve_name. */ AWS_CAL_API struct aws_ecc_key_pair *aws_ecc_key_pair_new_from_private_key( struct aws_allocator *allocator, enum aws_ecc_curve_name curve_name, const struct aws_byte_cursor *priv_key); /** * Creates an Elliptic Curve public/private key pair that can be used for signing and verifying. * Returns a new instance of aws_ecc_key_pair if the key was successfully built. * Otherwise returns NULL. */ AWS_CAL_API struct aws_ecc_key_pair *aws_ecc_key_pair_new_generate_random( struct aws_allocator *allocator, enum aws_ecc_curve_name curve_name); /** * Creates an Elliptic Curve public key that can be used for verifying. * Returns a new instance of aws_ecc_key_pair if the key was successfully built. * Otherwise returns NULL. Note: public_key_x::len and public_key_y::len must * match the appropriate length for the selected curve_name. */ AWS_CAL_API struct aws_ecc_key_pair *aws_ecc_key_pair_new_from_public_key( struct aws_allocator *allocator, enum aws_ecc_curve_name curve_name, const struct aws_byte_cursor *public_key_x, const struct aws_byte_cursor *public_key_y); /** * Creates an Elliptic Curve public/private key pair from a DER encoded key pair. * Returns a new instance of aws_ecc_key_pair if the key was successfully built. * Otherwise returns NULL. Whether or not signing or verification can be perform depends * on if encoded_keys is a public/private pair or a public key. */ AWS_CAL_API struct aws_ecc_key_pair *aws_ecc_key_pair_new_from_asn1( struct aws_allocator *allocator, const struct aws_byte_cursor *encoded_keys); /** * Creates an Elliptic curve public key from x and y coordinates encoded as hex strings * Returns a new instance of aws_ecc_key_pair if the key was successfully built. * Otherwise returns NULL. */ AWS_CAL_API struct aws_ecc_key_pair *aws_ecc_key_new_from_hex_coordinates( struct aws_allocator *allocator, enum aws_ecc_curve_name curve_name, struct aws_byte_cursor pub_x_hex_cursor, struct aws_byte_cursor pub_y_hex_cursor); /** * Derives a public key from the private key if supported by this operating system (not supported on OSX). * key_pair::pub_x and key_pair::pub_y will be set with the raw key buffers. */ AWS_CAL_API int aws_ecc_key_pair_derive_public_key(struct aws_ecc_key_pair *key_pair); /** * Get the curve name from the oid. OID here is the payload of the DER encoded ASN.1 part (doesn't include * type specifier or length. On success, the value of curve_name will be set. */ AWS_CAL_API int aws_ecc_curve_name_from_oid(struct aws_byte_cursor *oid, enum aws_ecc_curve_name *curve_name); /** * Get the DER encoded OID from the curve_name. The OID in this case will not contain the type or the length specifier. */ AWS_CAL_API int aws_ecc_oid_from_curve_name(enum aws_ecc_curve_name curve_name, struct aws_byte_cursor *oid); /** * Uses the key_pair's private key to sign message. The output will be in signature. Signature must be large enough * to hold the signature. Check aws_ecc_key_pair_signature_length() for the appropriate size. Signature will be DER * encoded. * * It is the callers job to make sure message is the appropriate cryptographic digest for this operation. It's usually * something like a SHA256. */ AWS_CAL_API int aws_ecc_key_pair_sign_message( const struct aws_ecc_key_pair *key_pair, const struct aws_byte_cursor *message, struct aws_byte_buf *signature); /** * Uses the key_pair's public key to verify signature of message. Signature should be DER * encoded. * * It is the callers job to make sure message is the appropriate cryptographic digest for this operation. It's usually * something like a SHA256. * * returns AWS_OP_SUCCESS if the signature is valid. */ AWS_CAL_API int aws_ecc_key_pair_verify_signature( const struct aws_ecc_key_pair *key_pair, const struct aws_byte_cursor *message, const struct aws_byte_cursor *signature); AWS_CAL_API size_t aws_ecc_key_pair_signature_length(const struct aws_ecc_key_pair *key_pair); AWS_CAL_API void aws_ecc_key_pair_get_public_key( const struct aws_ecc_key_pair *key_pair, struct aws_byte_cursor *pub_x, struct aws_byte_cursor *pub_y); AWS_CAL_API void aws_ecc_key_pair_get_private_key( const struct aws_ecc_key_pair *key_pair, struct aws_byte_cursor *private_d); AWS_CAL_API size_t aws_ecc_key_coordinate_byte_size_from_curve_name(enum aws_ecc_curve_name curve_name); enum aws_ecc_key_export_format { AWS_CAL_ECC_KEY_EXPORT_PRIVATE_SEC1, AWS_CAL_ECC_KEY_EXPORT_PRIVATE_PKCS8, AWS_CAL_ECC_KEY_EXPORT_PUBLIC_SPKI }; /** * Export key to a specified format. * out should be initialized and have enough space for the key. * returns error if export is not possible. */ AWS_CAL_API int aws_ecc_key_pair_export( const struct aws_ecc_key_pair *key_pair, enum aws_ecc_key_export_format format, struct aws_byte_buf *out); /* * Helper to decode ECDSA signature from DER format to base components R and S. * Does not pad and returns values as they are in DER. r and s might be smaller than coord size */ AWS_CAL_API int aws_ecc_decode_signature_der_to_raw( struct aws_allocator *allocator, struct aws_byte_cursor signature, struct aws_byte_cursor *out_r, struct aws_byte_cursor *out_s); /* * Helper to decode ECDSA signature from DER format to padded R || S. * Common jwt format. * Pads each R and S to pad_to. * Returns error if pad_to is less than len of r or s. * use aws_ecc_decode_signature_der_to_raw if you need unpadded values */ AWS_CAL_API int aws_ecc_decode_signature_der_to_raw_padded( struct aws_allocator *allocator, struct aws_byte_cursor signature, struct aws_byte_buf *out, size_t pad_to); /* * Helper to encode ECDSA signature from raw format (R and S) to DER. * out_signature must be initialized and must be able to fit signature */ AWS_CAL_API int aws_ecc_encode_signature_raw_to_der( struct aws_allocator *allocator, struct aws_byte_cursor r, struct aws_byte_cursor s, struct aws_byte_buf *out_signature); AWS_EXTERN_C_END AWS_POP_SANE_WARNING_LEVEL #endif /* AWS_CAL_ECC_H */