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Diffstat (limited to 'secure/lib/libcrypto/man/ECDSA_SIG_new.3')
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diff --git a/secure/lib/libcrypto/man/ECDSA_SIG_new.3 b/secure/lib/libcrypto/man/ECDSA_SIG_new.3 new file mode 100644 index 000000000000..9ea98f64626e --- /dev/null +++ b/secure/lib/libcrypto/man/ECDSA_SIG_new.3 @@ -0,0 +1,350 @@ +.\" Automatically generated by Pod::Man 4.09 (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_get0, ECDSA_SIG_get0_r, ECDSA_SIG_get0_s, ECDSA_SIG_set0, ECDSA_SIG_new, ECDSA_SIG_free, i2d_ECDSA_SIG, d2i_ECDSA_SIG, ECDSA_size, ECDSA_sign, ECDSA_do_sign, ECDSA_verify, ECDSA_do_verify, ECDSA_sign_setup, ECDSA_sign_ex, ECDSA_do_sign_ex \- low level elliptic curve digital signature algorithm (ECDSA) functions +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/ecdsa.h> +\& +\& ECDSA_SIG *ECDSA_SIG_new(void); +\& void ECDSA_SIG_free(ECDSA_SIG *sig); +\& void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps); +\& const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig); +\& const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig); +\& int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s); +\& 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); +\& int ECDSA_size(const EC_KEY *eckey); +\& +\& int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen, +\& unsigned char *sig, unsigned int *siglen, EC_KEY *eckey); +\& ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dgst_len, +\& 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_do_verify(const unsigned char *dgst, int dgst_len, +\& const ECDSA_SIG *sig, 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_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv, BIGNUM **rp); +\& 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); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +Note: these functions provide a low level interface to \s-1ECDSA.\s0 Most +applications should use the higher level \fB\s-1EVP\s0\fR interface such as +\&\fIEVP_DigestSignInit\fR\|(3) or \fIEVP_DigestVerifyInit\fR\|(3) instead. +.PP +\&\fB\s-1ECDSA_SIG\s0\fR is an opaque structure consisting of two BIGNUMs for the +\&\fBr\fR and \fBs\fR value of an \s-1ECDSA\s0 signature (see X9.62 or \s-1FIPS 186\-2\s0). +.PP +\&\fIECDSA_SIG_new()\fR allocates an empty \fB\s-1ECDSA_SIG\s0\fR structure. Note: before +OpenSSL 1.1.0 the: the \fBr\fR and \fBs\fR components were initialised. +.PP +\&\fIECDSA_SIG_free()\fR frees the \fB\s-1ECDSA_SIG\s0\fR structure \fBsig\fR. +.PP +\&\fIECDSA_SIG_get0()\fR returns internal pointers the \fBr\fR and \fBs\fR values contained +in \fBsig\fR and stores them in \fB*pr\fR and \fB*ps\fR, respectively. +The pointer \fBpr\fR or \fBps\fR can be \s-1NULL,\s0 in which case the corresponding value +is not returned. +.PP +The values \fBr\fR, \fBs\fR can also be retrieved separately by the corresponding +function \fIECDSA_SIG_get0_r()\fR and \fIECDSA_SIG_get0_s()\fR, respectively. +.PP +The \fBr\fR and \fBs\fR values can be set by calling \fIECDSA_SIG_set0()\fR and passing the +new values for \fBr\fR and \fBs\fR as parameters to the function. Calling this +function transfers the memory management of the values to the \s-1ECDSA_SIG\s0 object, +and therefore the values that have been passed in should not be freed directly +after this function has been called. +.PP +\&\fIi2d_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 \fIi2d_ECDSA_SIG()\fR +returns the expected length in bytes of the \s-1DER\s0 encoded signature). +\&\fIi2d_ECDSA_SIG()\fR returns the length of the \s-1DER\s0 encoded signature (or 0 on +error). +.PP +\&\fId2i_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 +\&\fIECDSA_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 +\&\fIECDSA_sign()\fR computes a digital signature of the \fBdgstlen\fR bytes hash value +\&\fBdgst\fR using the private \s-1EC\s0 key \fBeckey\fR. The \s-1DER\s0 encoded signatures is +stored in \fBsig\fR and its length is returned in \fBsig_len\fR. Note: \fBsig\fR must +point to ECDSA_size(eckey) bytes of memory. The parameter \fBtype\fR is currently +ignored. \fIECDSA_sign()\fR is wrapper function for \fIECDSA_sign_ex()\fR with \fBkinv\fR +and \fBrp\fR set to \s-1NULL.\s0 +.PP +\&\fIECDSA_do_sign()\fR is similar to \fIECDSA_sign()\fR except the signature is returned +as a newly allocated \fB\s-1ECDSA_SIG\s0\fR structure (or \s-1NULL\s0 on error). \fIECDSA_do_sign()\fR +is a wrapper function for \fIECDSA_do_sign_ex()\fR with \fBkinv\fR and \fBrp\fR set to +\&\s-1NULL.\s0 +.PP +\&\fIECDSA_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 +\&\fIECDSA_do_verify()\fR is similar to \fIECDSA_verify()\fR except the signature is +presented in the form of a pointer to an \fB\s-1ECDSA_SIG\s0\fR structure. +.PP +The remaining functions utilise the internal \fBkinv\fR and \fBr\fR values used +during signature computation. Most applications will never need to call these +and some external \s-1ECDSA ENGINE\s0 implementations may not support them at all if +either \fBkinv\fR or \fBr\fR is not \fB\s-1NULL\s0\fR. +.PP +\&\fIECDSA_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 \fIECDSA_sign_ex()\fR or \fIECDSA_do_sign_ex()\fR. +.PP +\&\fIECDSA_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 signature is stored in \fBsig\fR and its +length is returned in \fBsig_len\fR. Note: \fBsig\fR must point to ECDSA_size(eckey) +bytes of memory. The parameter \fBtype\fR is ignored. +.PP +\&\fIECDSA_do_sign_ex()\fR is similar to \fIECDSA_sign_ex()\fR except the signature is +returned as a newly allocated \fB\s-1ECDSA_SIG\s0\fR structure (or \s-1NULL\s0 on error). +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIECDSA_SIG_new()\fR returns \s-1NULL\s0 if the allocation fails. +.PP +\&\fIECDSA_SIG_set0()\fR returns 1 on success or 0 on failure. +.PP +\&\fIECDSA_SIG_get0_r()\fR and \fIECDSA_SIG_get0_s()\fR return the corresponding value, +or \s-1NULL\s0 if it is unset. +.PP +\&\fIECDSA_size()\fR returns the maximum length signature or 0 on error. +.PP +\&\fIECDSA_sign()\fR, \fIECDSA_sign_ex()\fR and \fIECDSA_sign_setup()\fR return 1 if successful +or 0 on error. +.PP +\&\fIECDSA_do_sign()\fR and \fIECDSA_do_sign_ex()\fR return a pointer to an allocated +\&\fB\s-1ECDSA_SIG\s0\fR structure or \s-1NULL\s0 on error. +.PP +\&\fIECDSA_verify()\fR and \fIECDSA_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 \fIERR_get_error\fR\|(3). +.SH "EXAMPLES" +.IX Header "EXAMPLES" +Creating an \s-1ECDSA\s0 signature of a given \s-1SHA\-256\s0 hash value using the +named curve prime256v1 (aka P\-256). +.PP +First step: create an \s-1EC_KEY\s0 object (note: this part is \fBnot\fR \s-1ECDSA\s0 +specific) +.PP +.Vb 3 +\& int ret; +\& ECDSA_SIG *sig; +\& EC_KEY *eckey; +\& +\& eckey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); +\& if (eckey == NULL) +\& /* error */ +\& if (EC_KEY_generate_key(eckey) == 0) +\& /* error */ +.Ve +.PP +Second step: compute the \s-1ECDSA\s0 signature of a \s-1SHA\-256\s0 hash value +using \fIECDSA_do_sign()\fR: +.PP +.Vb 3 +\& sig = ECDSA_do_sign(digest, 32, eckey); +\& if (sig == NULL) +\& /* error */ +.Ve +.PP +or using \fIECDSA_sign()\fR: +.PP +.Vb 2 +\& 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) == 0) +\& /* error */ +.Ve +.PP +Third step: verify the created \s-1ECDSA\s0 signature using \fIECDSA_do_verify()\fR: +.PP +.Vb 1 +\& ret = ECDSA_do_verify(digest, 32, sig, eckey); +.Ve +.PP +or using \fIECDSA_verify()\fR: +.PP +.Vb 1 +\& ret = ECDSA_verify(0, digest, 32, buffer, buf_len, eckey); +.Ve +.PP +and finally evaluate the return value: +.PP +.Vb 6 +\& if (ret == 1) +\& /* signature ok */ +\& else if (ret == 0) +\& /* incorrect signature */ +\& else +\& /* error */ +.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" +\&\fIDSA_new\fR\|(3), +\&\fIEVP_DigestSignInit\fR\|(3), +\&\fIEVP_DigestVerifyInit\fR\|(3) +.SH "COPYRIGHT" +.IX Header "COPYRIGHT" +Copyright 2004\-2018 The OpenSSL Project Authors. All Rights Reserved. +.PP +Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use +this file except in compliance with the License. You can obtain a copy +in the file \s-1LICENSE\s0 in the source distribution or at +<https://www.openssl.org/source/license.html>. |