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Edit File : ECDSA_size.3 \| Size : 11.65 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" ECDSA_SIG_new, ECDSA_SIG_free, i2d_ECDSA_SIG, d2i_ECDSA_SIG, ECDSA_size, ECDSA_sign_setup, ECDSA_sign, ECDSA_sign_ex, ECDSA_verify, ECDSA_do_sign, ECDSA_do_sign_ex, ECDSA_do_verify \- Elliptic Curve Digital Signature Algorithm .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ecdsa.h> \& \& ECDSA_SIG ECDSA_SIG_new(void); \& void ECDSA_SIG_free(ECDSA_SIG sig); \& int i2d_ECDSA_SIG(const ECDSA_SIG sig, unsigned char *pp); \& ECDSA_SIG d2i_ECDSA_SIG(ECDSA_SIG sig, const unsigned char pp, \& long len); \& \& ECDSA_SIG* ECDSA_do_sign(const unsigned char dgst, int dgst_len, \& EC_KEY eckey); \& ECDSA_SIG* ECDSA_do_sign_ex(const unsigned char dgst, int dgstlen, \& const BIGNUM kinv, const BIGNUM rp, \& EC_KEY eckey); \& int ECDSA_do_verify(const unsigned char dgst, int dgst_len, \& const ECDSA_SIG sig, EC_KEY* eckey); \& int ECDSA_sign_setup(EC_KEY eckey, BN_CTX ctx, \& BIGNUM kinv, BIGNUM rp); \& int ECDSA_sign(int type, const unsigned char dgst, \& int dgstlen, unsigned char sig, \& unsigned int siglen, EC_KEY eckey); \& int ECDSA_sign_ex(int type, const unsigned char dgst, \& int dgstlen, unsigned char sig, \& unsigned int siglen, const BIGNUM kinv, \& const BIGNUM rp, EC_KEY eckey); \& int ECDSA_verify(int type, const unsigned char dgst, \& int dgstlen, const unsigned char sig, \& int siglen, EC_KEY eckey); \& int ECDSA_size(const EC_KEY eckey); \& \& const ECDSA_METHOD* ECDSA_OpenSSL(void); \& void ECDSA_set_default_method(const ECDSA_METHOD meth); \& const ECDSA_METHOD ECDSA_get_default_method(void); \& int ECDSA_set_method(EC_KEY eckey,const ECDSA_METHOD meth); \& \& int ECDSA_get_ex_new_index(long argl, void argp, \& CRYPTO_EX_new new_func, \& CRYPTO_EX_dup dup_func, \& CRYPTO_EX_free free_func); \& int ECDSA_set_ex_data(EC_KEY d, int idx, void arg); \& void* ECDSA_get_ex_data(EC_KEY d, int idx); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fB\s-1ECDSA_SIG\s0\fR structure consists of two BIGNUMs for the r and s value of a \s-1ECDSA\s0 signature (see X9.62 or \s-1FIPS 186\-2\s0). .PP .Vb 5 \& struct \& { \& BIGNUM r; \& BIGNUM s; \& } ECDSA_SIG; .Ve .PP \&\fBECDSA_SIG_new()\fR allocates a new \fB\s-1ECDSA_SIG\s0\fR structure (note: this function also allocates the BIGNUMs) and initialize it. .PP \&\fBECDSA_SIG_free()\fR frees the \fB\s-1ECDSA_SIG\s0\fR structure \fBsig\fR. .PP \&\fBi2d_ECDSA_SIG()\fR creates the \s-1DER\s0 encoding of the \s-1ECDSA\s0 signature \&\fBsig\fR and writes the encoded signature to \fBpp\fR (note: if \fBpp\fR is \s-1NULL\s0 \fBi2d_ECDSA_SIG\fR returns the expected length in bytes of the \s-1DER\s0 encoded signature). \fBi2d_ECDSA_SIG\fR returns the length of the \s-1DER\s0 encoded signature (or 0 on error). .PP \&\fBd2i_ECDSA_SIG()\fR decodes a \s-1DER\s0 encoded \s-1ECDSA\s0 signature and returns the decoded signature in a newly allocated \fB\s-1ECDSA_SIG\s0\fR structure. \&\fBsig\fR points to the buffer containing the \s-1DER\s0 encoded signature of size \fBlen\fR. .PP \&\fBECDSA_size()\fR returns the maximum length of a \s-1DER\s0 encoded \&\s-1ECDSA\s0 signature created with the private \s-1EC\s0 key \fBeckey\fR. .PP \&\fBECDSA_sign_setup()\fR may be used to precompute parts of the signing operation. \fBeckey\fR is the private \s-1EC\s0 key and \fBctx\fR is a pointer to \fB\s-1BN_CTX\s0\fR structure (or \s-1NULL\s0). The precomputed values or returned in \fBkinv\fR and \fBrp\fR and can be used in a later call to \fBECDSA_sign_ex\fR or \fBECDSA_do_sign_ex\fR. .PP \&\fBECDSA_sign()\fR is wrapper function for ECDSA_sign_ex with \fBkinv\fR and \fBrp\fR set to \s-1NULL.\s0 .PP \&\fBECDSA_sign_ex()\fR computes a digital signature of the \fBdgstlen\fR bytes hash value \fBdgst\fR using the private \s-1EC\s0 key \fBeckey\fR and the optional pre-computed values \fBkinv\fR and \fBrp\fR. The \s-1DER\s0 encoded signatures is stored in \fBsig\fR and it's length is returned in \fBsig_len\fR. Note: \fBsig\fR must point to \fBECDSA_size\fR bytes of memory. The parameter \fBtype\fR is ignored. .PP \&\fBECDSA_verify()\fR verifies that the signature in \fBsig\fR of size \&\fBsiglen\fR is a valid \s-1ECDSA\s0 signature of the hash value \&\fBdgst\fR of size \fBdgstlen\fR using the public key \fBeckey\fR. The parameter \fBtype\fR is ignored. .PP \&\fBECDSA_do_sign()\fR is wrapper function for ECDSA_do_sign_ex with \fBkinv\fR and \fBrp\fR set to \s-1NULL.\s0 .PP \&\fBECDSA_do_sign_ex()\fR computes a digital signature of the \fBdgst_len\fR bytes hash value \fBdgst\fR using the private key \fBeckey\fR and the optional pre-computed values \fBkinv\fR and \fBrp\fR. The signature is returned in a newly allocated \fB\s-1ECDSA_SIG\s0\fR structure (or \s-1NULL\s0 on error). .PP \&\fBECDSA_do_verify()\fR verifies that the signature \fBsig\fR is a valid \&\s-1ECDSA\s0 signature of the hash value \fBdgst\fR of size \fBdgst_len\fR using the public key \fBeckey\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBECDSA_SIG_new()\fR returns \s-1NULL\s0 if the allocation fails. .PP \&\fBECDSA_size()\fR returns the maximum length signature or 0 on error. .PP \&\fBECDSA_sign_setup()\fR and \fBECDSA_sign()\fR return 1 if successful or 0 on error. .PP \&\fBECDSA_verify()\fR and \fBECDSA_do_verify()\fR return 1 for a valid signature, 0 for an invalid signature and \-1 on error. The error codes can be obtained by \fBERR_get_error\fR\\|(3). .SH "EXAMPLES" .IX Header "EXAMPLES" Creating a \s-1ECDSA\s0 signature of given \s-1SHA\-1\s0 hash value using the named curve secp192k1. .PP First step: create a \s-1EC_KEY\s0 object (note: this part is \fBnot\fR \s-1ECDSA\s0 specific) .PP .Vb 12 \& int ret; \& ECDSA_SIG sig; \& EC_KEY eckey; \& eckey = EC_KEY_new_by_curve_name(NID_secp192k1); \& if (eckey == NULL) \& { \& / error / \& } \& if (!EC_KEY_generate_key(eckey)) \& { \& / error / \& } .Ve .PP Second step: compute the \s-1ECDSA\s0 signature of a \s-1SHA\-1\s0 hash value using \fBECDSA_do_sign\fR .PP .Vb 5 \& sig = ECDSA_do_sign(digest, 20, eckey); \& if (sig == NULL) \& { \& / error / \& } .Ve .PP or using \fBECDSA_sign\fR .PP .Vb 9 \& unsigned char buffer, pp; \& int buf_len; \& buf_len = ECDSA_size(eckey); \& buffer = OPENSSL_malloc(buf_len); \& pp = buffer; \& if (!ECDSA_sign(0, dgst, dgstlen, pp, &buf_len, eckey); \& { \& / error / \& } .Ve .PP Third step: verify the created \s-1ECDSA\s0 signature using \fBECDSA_do_verify\fR .PP .Vb 1 \& ret = ECDSA_do_verify(digest, 20, sig, eckey); .Ve .PP or using \fBECDSA_verify\fR .PP .Vb 1 \& ret = ECDSA_verify(0, digest, 20, buffer, buf_len, eckey); .Ve .PP and finally evaluate the return value: .PP .Vb 12 \& if (ret == \-1) \& { \& / error / \& } \& else if (ret == 0) \& { \& / incorrect signature / \& } \& else / ret == 1 / \& { \& / signature ok */ \& } .Ve .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1ANSI X9.62, US\s0 Federal Information Processing Standard \s-1FIPS 186\-2\s0 (Digital Signature Standard, \s-1DSS\s0) .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBdsa\fR\\|(3), \fBrsa\fR\\|(3) .SH "HISTORY" .IX Header "HISTORY" The ecdsa implementation was first introduced in OpenSSL 0.9.8 .SH "AUTHOR" .IX Header "AUTHOR" Nils Larsch for the OpenSSL project (http://www.openssl.org). Back

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.\" ========================================================================
.\"
.IX Title "ecdsa 3"
.TH ecdsa 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
ECDSA_SIG_new, ECDSA_SIG_free, i2d_ECDSA_SIG, d2i_ECDSA_SIG, ECDSA_size, ECDSA_sign_setup, ECDSA_sign, ECDSA_sign_ex, ECDSA_verify, ECDSA_do_sign, ECDSA_do_sign_ex, ECDSA_do_verify \- Elliptic Curve Digital Signature Algorithm
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ecdsa.h>
\&
\& ECDSA_SIG*     ECDSA_SIG_new(void);
\& void           ECDSA_SIG_free(ECDSA_SIG *sig);
\& int            i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **pp);
\& ECDSA_SIG*     d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp, 
\&                long len);
\&
\& ECDSA_SIG*     ECDSA_do_sign(const unsigned char *dgst, int dgst_len,
\&                        EC_KEY *eckey);
\& ECDSA_SIG*     ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen, 
\&                        const BIGNUM *kinv, const BIGNUM *rp,
\&                        EC_KEY *eckey);
\& int            ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
\&                        const ECDSA_SIG *sig, EC_KEY* eckey);
\& int            ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx,
\&                        BIGNUM **kinv, BIGNUM **rp);
\& int            ECDSA_sign(int type, const unsigned char *dgst,
\&                        int dgstlen, unsigned char *sig,
\&                        unsigned int *siglen, EC_KEY *eckey);
\& int            ECDSA_sign_ex(int type, const unsigned char *dgst,
\&                        int dgstlen, unsigned char *sig,
\&                        unsigned int *siglen, const BIGNUM *kinv, 
\&                        const BIGNUM *rp, EC_KEY *eckey);
\& int            ECDSA_verify(int type, const unsigned char *dgst,
\&                        int dgstlen, const unsigned char *sig,
\&                        int siglen, EC_KEY *eckey);
\& int            ECDSA_size(const EC_KEY *eckey);
\&
\& const ECDSA_METHOD*    ECDSA_OpenSSL(void);
\& void           ECDSA_set_default_method(const ECDSA_METHOD *meth);
\& const ECDSA_METHOD*    ECDSA_get_default_method(void);
\& int            ECDSA_set_method(EC_KEY *eckey,const ECDSA_METHOD *meth);
\&
\& int            ECDSA_get_ex_new_index(long argl, void *argp,
\&                        CRYPTO_EX_new *new_func,
\&                        CRYPTO_EX_dup *dup_func,
\&                        CRYPTO_EX_free *free_func);
\& int            ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg);
\& void*          ECDSA_get_ex_data(EC_KEY *d, int idx);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fB\s-1ECDSA_SIG\s0\fR structure consists of two BIGNUMs for the
r and s value of a \s-1ECDSA\s0 signature (see X9.62 or \s-1FIPS 186\-2\s0).
.PP
.Vb 5
\& struct
\&        {
\&        BIGNUM *r;
\&        BIGNUM *s;
\& } ECDSA_SIG;
.Ve
.PP
\&\fBECDSA_SIG_new()\fR allocates a new \fB\s-1ECDSA_SIG\s0\fR structure (note: this
function also allocates the BIGNUMs) and initialize it.
.PP
\&\fBECDSA_SIG_free()\fR frees the \fB\s-1ECDSA_SIG\s0\fR structure \fBsig\fR.
.PP
\&\fBi2d_ECDSA_SIG()\fR creates the \s-1DER\s0 encoding of the \s-1ECDSA\s0 signature
\&\fBsig\fR and writes the encoded signature to \fB*pp\fR (note: if \fBpp\fR
is \s-1NULL\s0 \fBi2d_ECDSA_SIG\fR returns the expected length in bytes of 
the \s-1DER\s0 encoded signature). \fBi2d_ECDSA_SIG\fR returns the length
of the \s-1DER\s0 encoded signature (or 0 on error).
.PP
\&\fBd2i_ECDSA_SIG()\fR decodes a \s-1DER\s0 encoded \s-1ECDSA\s0 signature and returns
the decoded signature in a newly allocated \fB\s-1ECDSA_SIG\s0\fR structure.
\&\fB*sig\fR points to the buffer containing the \s-1DER\s0 encoded signature
of size \fBlen\fR.
.PP
\&\fBECDSA_size()\fR returns the maximum length of a \s-1DER\s0 encoded
\&\s-1ECDSA\s0 signature created with the private \s-1EC\s0 key \fBeckey\fR.
.PP
\&\fBECDSA_sign_setup()\fR may be used to precompute parts of the
signing operation. \fBeckey\fR is the private \s-1EC\s0 key and \fBctx\fR
is a pointer to \fB\s-1BN_CTX\s0\fR structure (or \s-1NULL\s0). The precomputed
values or returned in \fBkinv\fR and \fBrp\fR and can be used in a
later call to \fBECDSA_sign_ex\fR or \fBECDSA_do_sign_ex\fR.
.PP
\&\fBECDSA_sign()\fR is wrapper function for ECDSA_sign_ex with \fBkinv\fR
and \fBrp\fR set to \s-1NULL.\s0
.PP
\&\fBECDSA_sign_ex()\fR computes a digital signature of the \fBdgstlen\fR bytes
hash value \fBdgst\fR using the private \s-1EC\s0 key \fBeckey\fR and the optional
pre-computed values \fBkinv\fR and \fBrp\fR. The \s-1DER\s0 encoded signatures is
stored in \fBsig\fR and it's length is returned in \fBsig_len\fR. Note: \fBsig\fR
must point to \fBECDSA_size\fR bytes of memory. The parameter \fBtype\fR
is ignored.
.PP
\&\fBECDSA_verify()\fR verifies that the signature in \fBsig\fR of size
\&\fBsiglen\fR is a valid \s-1ECDSA\s0 signature of the hash value
\&\fBdgst\fR of size \fBdgstlen\fR using the public key \fBeckey\fR.
The parameter \fBtype\fR is ignored.
.PP
\&\fBECDSA_do_sign()\fR is wrapper function for ECDSA_do_sign_ex with \fBkinv\fR
and \fBrp\fR set to \s-1NULL.\s0
.PP
\&\fBECDSA_do_sign_ex()\fR computes a digital signature of the \fBdgst_len\fR
bytes hash value \fBdgst\fR using the private key \fBeckey\fR and the
optional pre-computed values \fBkinv\fR and \fBrp\fR. The signature is
returned in a newly allocated \fB\s-1ECDSA_SIG\s0\fR structure (or \s-1NULL\s0 on error).
.PP
\&\fBECDSA_do_verify()\fR verifies that the signature \fBsig\fR is a valid
\&\s-1ECDSA\s0 signature of the hash value \fBdgst\fR of size \fBdgst_len\fR
using the public key \fBeckey\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBECDSA_SIG_new()\fR returns \s-1NULL\s0 if the allocation fails.
.PP
\&\fBECDSA_size()\fR returns the maximum length signature or 0 on error.
.PP
\&\fBECDSA_sign_setup()\fR and \fBECDSA_sign()\fR return 1 if successful or 0
on error.
.PP
\&\fBECDSA_verify()\fR and \fBECDSA_do_verify()\fR return 1 for a valid
signature, 0 for an invalid signature and \-1 on error.
The error codes can be obtained by \fBERR_get_error\fR\|(3).
.SH "EXAMPLES"
.IX Header "EXAMPLES"
Creating a \s-1ECDSA\s0 signature of given \s-1SHA\-1\s0 hash value using the
named curve secp192k1.
.PP
First step: create a \s-1EC_KEY\s0 object (note: this part is \fBnot\fR \s-1ECDSA\s0
specific)
.PP
.Vb 12
\& int        ret;
\& ECDSA_SIG *sig;
\& EC_KEY    *eckey;
\& eckey = EC_KEY_new_by_curve_name(NID_secp192k1);
\& if (eckey == NULL)
\&        {
\&        /* error */
\&        }
\& if (!EC_KEY_generate_key(eckey))
\&        {
\&        /* error */
\&        }
.Ve
.PP
Second step: compute the \s-1ECDSA\s0 signature of a \s-1SHA\-1\s0 hash value 
using \fBECDSA_do_sign\fR
.PP
.Vb 5
\& sig = ECDSA_do_sign(digest, 20, eckey);
\& if (sig == NULL)
\&        {
\&        /* error */
\&        }
.Ve
.PP
or using \fBECDSA_sign\fR
.PP
.Vb 9
\& unsigned char *buffer, *pp;
\& int            buf_len;
\& buf_len = ECDSA_size(eckey);
\& buffer  = OPENSSL_malloc(buf_len);
\& pp = buffer;
\& if (!ECDSA_sign(0, dgst, dgstlen, pp, &buf_len, eckey);
\&        {
\&        /* error */
\&        }
.Ve
.PP
Third step: verify the created \s-1ECDSA\s0 signature using \fBECDSA_do_verify\fR
.PP
.Vb 1
\& ret = ECDSA_do_verify(digest, 20, sig, eckey);
.Ve
.PP
or using \fBECDSA_verify\fR
.PP
.Vb 1
\& ret = ECDSA_verify(0, digest, 20, buffer, buf_len, eckey);
.Ve
.PP
and finally evaluate the return value:
.PP
.Vb 12
\& if (ret == \-1)
\&        {
\&        /* error */
\&        }
\& else if (ret == 0)
\&        {
\&        /* incorrect signature */
\&        }
\& else   /* ret == 1 */
\&        {
\&        /* signature ok */
\&        }
.Ve
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1ANSI X9.62, US\s0 Federal Information Processing Standard \s-1FIPS 186\-2\s0
(Digital Signature Standard, \s-1DSS\s0)
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBdsa\fR\|(3), \fBrsa\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The ecdsa implementation was first introduced in OpenSSL 0.9.8
.SH "AUTHOR"
.IX Header "AUTHOR"
Nils Larsch for the OpenSSL project (http://www.openssl.org).

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