diff options
Diffstat (limited to 'lib/libcrypto/dsa/dsa_asn1.c')
| -rw-r--r-- | lib/libcrypto/dsa/dsa_asn1.c | 82 |
1 files changed, 80 insertions, 2 deletions
diff --git a/lib/libcrypto/dsa/dsa_asn1.c b/lib/libcrypto/dsa/dsa_asn1.c index 23fce555aa4..0645facb4bf 100644 --- a/lib/libcrypto/dsa/dsa_asn1.c +++ b/lib/libcrypto/dsa/dsa_asn1.c @@ -1,5 +1,5 @@ /* dsa_asn1.c */ -/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL +/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project 2000. */ /* ==================================================================== @@ -61,6 +61,11 @@ #include <openssl/dsa.h> #include <openssl/asn1.h> #include <openssl/asn1t.h> +#include <openssl/bn.h> +#ifdef OPENSSL_FIPS +#include <openssl/fips.h> +#endif + /* Override the default new methods */ static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it) @@ -83,7 +88,7 @@ ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = { ASN1_SIMPLE(DSA_SIG, s, CBIGNUM) } ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG) -IMPLEMENT_ASN1_FUNCTIONS_const(DSA_SIG) +IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA_SIG,DSA_SIG,DSA_SIG) /* Override the default free and new methods */ static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it) @@ -138,3 +143,76 @@ ASN1_CHOICE_cb(DSAPublicKey, dsa_cb) = { } ASN1_CHOICE_END_cb(DSA, DSAPublicKey, write_params) IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey) + +int DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig, + unsigned int *siglen, DSA *dsa) + { + DSA_SIG *s; +#ifdef OPENSSL_FIPS + if(FIPS_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW)) + { + DSAerr(DSA_F_DSA_SIGN, DSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE); + return 0; + } +#endif + s=DSA_do_sign(dgst,dlen,dsa); + if (s == NULL) + { + *siglen=0; + return(0); + } + *siglen=i2d_DSA_SIG(s,&sig); + DSA_SIG_free(s); + return(1); + } + +int DSA_size(const DSA *r) + { + int ret,i; + ASN1_INTEGER bs; + unsigned char buf[4]; /* 4 bytes looks really small. + However, i2d_ASN1_INTEGER() will not look + beyond the first byte, as long as the second + parameter is NULL. */ + + i=BN_num_bits(r->q); + bs.length=(i+7)/8; + bs.data=buf; + bs.type=V_ASN1_INTEGER; + /* If the top bit is set the asn1 encoding is 1 larger. */ + buf[0]=0xff; + + i=i2d_ASN1_INTEGER(&bs,NULL); + i+=i; /* r and s */ + ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); + return(ret); + } + +/* data has already been hashed (probably with SHA or SHA-1). */ +/* returns + * 1: correct signature + * 0: incorrect signature + * -1: error + */ +int DSA_verify(int type, const unsigned char *dgst, int dgst_len, + const unsigned char *sigbuf, int siglen, DSA *dsa) + { + DSA_SIG *s; + int ret=-1; +#ifdef OPENSSL_FIPS + if(FIPS_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW)) + { + DSAerr(DSA_F_DSA_VERIFY, DSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE); + return 0; + } +#endif + + s = DSA_SIG_new(); + if (s == NULL) return(ret); + if (d2i_DSA_SIG(&s,&sigbuf,siglen) == NULL) goto err; + ret=DSA_do_verify(dgst,dgst_len,s,dsa); +err: + DSA_SIG_free(s); + return(ret); + } + |