pigweed / third_party / boringssl / boringssl / 10f97f3bfcecc3fbe8e9f02e7c426f7e340f7f54 / . / include / openssl / ecdsa.h

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* acknowledgment: | |

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* | |

* This product includes cryptographic software written by Eric Young | |

* (eay@cryptsoft.com). This product includes software written by Tim | |

* Hudson (tjh@cryptsoft.com). */ | |

#ifndef OPENSSL_HEADER_ECDSA_H | |

#define OPENSSL_HEADER_ECDSA_H | |

#include <openssl/base.h> | |

#include <openssl/ec_key.h> | |

#if defined(__cplusplus) | |

extern "C" { | |

#endif | |

/* ECDSA contains functions for signing and verifying with the Digital Signature | |

* Algorithm over elliptic curves. */ | |

/* Signing and verifing. */ | |

/* ECDSA_sign signs |digest_len| bytes from |digest| with |key| and writes the | |

* resulting signature to |sig|, which must have |ECDSA_size(key)| bytes of | |

* space. On successful exit, |*sig_len| is set to the actual number of bytes | |

* written. The |type| argument should be zero. It returns one on success and | |

* zero otherwise. */ | |

OPENSSL_EXPORT int ECDSA_sign(int type, const uint8_t *digest, | |

size_t digest_len, uint8_t *sig, | |

unsigned int *sig_len, EC_KEY *key); | |

/* ECDSA_verify verifies that |sig_len| bytes from |sig| constitute a valid | |

* signature by |key| of |digest|. (The |type| argument should be zero.) It | |

* returns one on success or zero if the signature is invalid or an error | |

* occured. */ | |

OPENSSL_EXPORT int ECDSA_verify(int type, const uint8_t *digest, | |

size_t digest_len, const uint8_t *sig, | |

size_t sig_len, EC_KEY *key); | |

/* ECDSA_size returns the maximum size of an ECDSA signature using |key|. It | |

* returns zero on error. */ | |

OPENSSL_EXPORT size_t ECDSA_size(const EC_KEY *key); | |

/* Low-level signing and verification. | |

* | |

* Low-level functions handle signatures as |ECDSA_SIG| structures which allow | |

* the two values in an ECDSA signature to be handled separately. */ | |

struct ecdsa_sig_st { | |

BIGNUM *r; | |

BIGNUM *s; | |

}; | |

/* ECDSA_SIG_new returns a fresh |ECDSA_SIG| structure or NULL on error. */ | |

OPENSSL_EXPORT ECDSA_SIG *ECDSA_SIG_new(void); | |

/* ECDSA_SIG_free frees |sig| its member |BIGNUM|s. */ | |

OPENSSL_EXPORT void ECDSA_SIG_free(ECDSA_SIG *sig); | |

/* ECDSA_do_sign signs |digest_len| bytes from |digest| with |key| and returns | |

* the resulting signature structure, or NULL on error. */ | |

OPENSSL_EXPORT ECDSA_SIG *ECDSA_do_sign(const uint8_t *digest, | |

size_t digest_len, EC_KEY *key); | |

/* ECDSA_do_verify verifies that |sig| constitutes a valid signature by |key| | |

* of |digest|. It returns one on success or zero if the signature is invalid | |

* or on error. */ | |

OPENSSL_EXPORT int ECDSA_do_verify(const uint8_t *digest, size_t digest_len, | |

const ECDSA_SIG *sig, EC_KEY *key); | |

/* Signing with precomputation. | |

* | |

* Parts of the ECDSA signature can be independent of the message to be signed | |

* thus it's possible to precompute them and reduce the signing latency. | |

* | |

* TODO(fork): remove support for this as it cannot support safe-randomness. */ | |

/* ECDSA_sign_setup precomputes parts of an ECDSA signing operation. It sets | |

* |*kinv| and |*rp| to the precomputed values and uses the |ctx| argument, if | |

* not NULL. It returns one on success and zero otherwise. */ | |

OPENSSL_EXPORT int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv, | |

BIGNUM **rp); | |

/* ECDSA_do_sign_ex is the same as |ECDSA_do_sign| but takes precomputed values | |

* as generated by |ECDSA_sign_setup|. */ | |

OPENSSL_EXPORT ECDSA_SIG *ECDSA_do_sign_ex(const uint8_t *digest, | |

size_t digest_len, | |

const BIGNUM *kinv, const BIGNUM *rp, | |

EC_KEY *eckey); | |

/* ECDSA_sign_ex is the same as |ECDSA_sign| but takes precomputed values as | |

* generated by |ECDSA_sign_setup|. */ | |

OPENSSL_EXPORT int ECDSA_sign_ex(int type, const uint8_t *digest, | |

size_t digest_len, uint8_t *sig, | |

unsigned int *sig_len, const BIGNUM *kinv, | |

const BIGNUM *rp, EC_KEY *eckey); | |

/* ASN.1 functions. */ | |

/* ECDSA_SIG_parse parses a DER-encoded ECDSA-Sig-Value structure from |cbs| and | |

* advances |cbs|. It returns a newly-allocated |ECDSA_SIG| or NULL on error. */ | |

OPENSSL_EXPORT ECDSA_SIG *ECDSA_SIG_parse(CBS *cbs); | |

/* ECDSA_SIG_from_bytes parses |in| as a DER-encoded ECDSA-Sig-Value structure. | |

* It returns a newly-allocated |ECDSA_SIG| structure or NULL on error. */ | |

OPENSSL_EXPORT ECDSA_SIG *ECDSA_SIG_from_bytes(const uint8_t *in, | |

size_t in_len); | |

/* ECDSA_SIG_marshal marshals |sig| as a DER-encoded ECDSA-Sig-Value and appends | |

* the result to |cbb|. It returns one on success and zero on error. */ | |

OPENSSL_EXPORT int ECDSA_SIG_marshal(CBB *cbb, const ECDSA_SIG *sig); | |

/* ECDSA_SIG_to_bytes marshals |sig| as a DER-encoded ECDSA-Sig-Value and, on | |

* success, sets |*out_bytes| to a newly allocated buffer containing the result | |

* and returns one. Otherwise, it returns zero. The result should be freed with | |

* |OPENSSL_free|. */ | |

OPENSSL_EXPORT int ECDSA_SIG_to_bytes(uint8_t **out_bytes, size_t *out_len, | |

const ECDSA_SIG *sig); | |

/* ECDSA_SIG_max_len returns the maximum length of a DER-encoded ECDSA-Sig-Value | |

* structure for a group whose order is represented in |order_len| bytes, or | |

* zero on overflow. */ | |

OPENSSL_EXPORT size_t ECDSA_SIG_max_len(size_t order_len); | |

/* Deprecated functions. */ | |

/* d2i_ECDSA_SIG parses an ASN.1, DER-encoded, signature from |len| bytes at | |

* |*inp|. If |out| is not NULL then, on exit, a pointer to the result is in | |

* |*out|. Note that, even if |*out| is already non-NULL on entry, it will not | |

* be written to. Rather, a fresh |ECDSA_SIG| is allocated and the previous one | |

* is freed. On successful exit, |*inp| is advanced past the DER structure. It | |

* returns the result or NULL on error. */ | |

OPENSSL_EXPORT ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **out, const uint8_t **inp, | |

long len); | |

/* i2d_ECDSA_SIG marshals a signature from |sig| to an ASN.1, DER | |

* structure. If |outp| is not NULL then the result is written to |*outp| and | |

* |*outp| is advanced just past the output. It returns the number of bytes in | |

* the result, whether written or not, or a negative value on error. */ | |

OPENSSL_EXPORT int i2d_ECDSA_SIG(const ECDSA_SIG *sig, uint8_t **outp); | |

#if defined(__cplusplus) | |

} /* extern C */ | |

#endif | |

#define ECDSA_R_BAD_SIGNATURE 100 | |

#define ECDSA_R_MISSING_PARAMETERS 101 | |

#define ECDSA_R_NEED_NEW_SETUP_VALUES 102 | |

#define ECDSA_R_NOT_IMPLEMENTED 103 | |

#define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104 | |

#define ECDSA_R_ENCODE_ERROR 105 | |

#endif /* OPENSSL_HEADER_ECDSA_H */ |