Elliptic Curve Digital Signature Algorithm Primitives. More...

Functions
EpidStatus	EcdsaVerifyBuffer (ConstOctStr buf, size_t buf_len, EcdsaPublicKey const pubkey, EcdsaSignature const sig)
	Verifies authenticity of a digital signature over a buffer. More...

EpidStatus	EcdsaSignBuffer (ConstOctStr buf, size_t buf_len, EcdsaPrivateKey const privkey, BitSupplier rnd_func, void rnd_param, EcdsaSignature *sig)
	Creates ECDSA signature of buffer. More...

Detailed Description

Elliptic Curve Digital Signature Algorithm Primitives.

Provides APIs for computing and checking buffer signatures using the Elliptic Curve Digital Signature Algorithm.

Function Documentation

◆ EcdsaSignBuffer()

EpidStatus EcdsaSignBuffer	(	ConstOctStr	buf,
		size_t	buf_len,
		EcdsaPrivateKey const *	privkey,
		BitSupplier	rnd_func,
		void *	rnd_param,
		EcdsaSignature *	sig
	)

Creates ECDSA signature of buffer.

Uses Elliptic Curve Digital Signature Algorithm (ECDSA) to generate a signature of the SHA-256 hash of the input buffer with the provided private key.

The operation is over the standard secp256r1 curve.

Parameters

[in]	buf	Pointer to buffer containing message to sign.
[in]	buf_len	The size of buf in bytes.
[in]	privkey	The ECDSA private key on secp256r1 curve.
[in]	rnd_func	Random number generator.
[in]	rnd_param	Pass through context data for rnd_func.
[out]	sig	The resulting ECDSA signature.

Returns: EpidStatus

Return values

kEpidRandMaxIterErr Failed to sign after maximum number of iterations due to bad luck in random number generation.

See also: EcdsaSignBuffer

◆ EcdsaVerifyBuffer()

EpidStatus EcdsaVerifyBuffer	(	ConstOctStr	buf,
		size_t	buf_len,
		EcdsaPublicKey const *	pubkey,
		EcdsaSignature const *	sig
	)

Verifies authenticity of a digital signature over a buffer.

Uses Elliptic Curve Digital Signature Algorithm (ECDSA) to verify that the SHA-256 hash of the input buffer was signed with the private key corresponding to the provided public key.