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114 changes: 114 additions & 0 deletions
114
src/pk/asn1/x509/x509_decode_public_key_from_certificate.c
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| /* LibTomCrypt, modular cryptographic library -- Tom St Denis | ||
| * | ||
| * LibTomCrypt is a library that provides various cryptographic | ||
| * algorithms in a highly modular and flexible manner. | ||
| * | ||
| * The library is free for all purposes without any express | ||
| * guarantee it works. | ||
| */ | ||
| #include "tomcrypt_private.h" | ||
|
|
||
| /** | ||
| @file x509_decode_public_key_from_certificate.c | ||
| ASN.1 DER/X.509, decode a certificate | ||
| */ | ||
|
|
||
| #ifdef LTC_DER | ||
|
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| /* Check if it looks like a SubjectPublicKeyInfo */ | ||
| #define LOOKS_LIKE_SPKI(l) (l)->type == LTC_ASN1_SEQUENCE \ | ||
| && (l)->child \ | ||
| && (l)->child->type == LTC_ASN1_OBJECT_IDENTIFIER \ | ||
| && (l)->next \ | ||
| && (l)->next->type == LTC_ASN1_BIT_STRING | ||
|
|
||
| /** | ||
| Try to decode the public key from a X.509 certificate | ||
| @param in The input buffer | ||
| @param inlen The length of the input buffer | ||
| @param algorithm One out of the enum #public_key_algorithms | ||
| @param param_type The parameters' type out of the enum ltc_asn1_type | ||
| @param parameters The parameters to include | ||
| @param parameters_len [in/out] The number of parameters to include | ||
| @param callback The callback | ||
| @param ctx The context passed to the callback | ||
| @return CRYPT_OK on success | ||
| */ | ||
| int x509_decode_public_key_from_certificate(const unsigned char *in, unsigned long inlen, | ||
| enum ltc_oid_id algorithm, ltc_asn1_type param_type, | ||
| ltc_asn1_list* parameters, unsigned long *parameters_len, | ||
| public_key_decode_cb callback, void *ctx) | ||
| { | ||
| int err; | ||
| unsigned char *tmpbuf; | ||
| unsigned long tmpbuf_len, tmp_inlen; | ||
| ltc_asn1_list *decoded_list = NULL, *l; | ||
|
|
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| LTC_ARGCHK(in != NULL); | ||
| LTC_ARGCHK(inlen != 0); | ||
|
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| tmpbuf_len = inlen; | ||
| tmpbuf = XCALLOC(1, tmpbuf_len); | ||
| if (tmpbuf == NULL) { | ||
| err = CRYPT_MEM; | ||
| goto LBL_OUT; | ||
| } | ||
|
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| tmp_inlen = inlen; | ||
| if ((err = der_decode_sequence_flexi(in, &tmp_inlen, &decoded_list)) == CRYPT_OK) { | ||
| l = decoded_list; | ||
|
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| err = CRYPT_INVALID_ARG; | ||
|
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| /* Move 2 levels up in the tree | ||
| SEQUENCE | ||
| SEQUENCE | ||
| ... | ||
| */ | ||
| if (l->type == LTC_ASN1_SEQUENCE && l->child) { | ||
| l = l->child; | ||
| if (l->type == LTC_ASN1_SEQUENCE && l->child) { | ||
| l = l->child; | ||
|
|
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| /* Move forward in the tree until we find this combination | ||
| ... | ||
| SEQUENCE | ||
| SEQUENCE | ||
| OBJECT IDENTIFIER <some PKA OID, e.g. 1.2.840.113549.1.1.1> | ||
| NULL | ||
| BIT STRING | ||
| */ | ||
| do { | ||
| /* The additional check for l->data is there to make sure | ||
| * we won't try to decode a list that has been 'shrunk' | ||
| */ | ||
| if (l->type == LTC_ASN1_SEQUENCE | ||
| && l->data | ||
| && l->child | ||
| && LOOKS_LIKE_SPKI(l->child)) { | ||
| err = x509_decode_subject_public_key_info(l->data, l->size, | ||
| algorithm, tmpbuf, &tmpbuf_len, | ||
| param_type, parameters, parameters_len); | ||
| if (err == CRYPT_OK) { | ||
| err = callback(tmpbuf, tmpbuf_len, ctx); | ||
| goto LBL_OUT; | ||
| } | ||
| } | ||
| l = l->next; | ||
| } while(l); | ||
| } | ||
| } | ||
| } | ||
|
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| LBL_OUT: | ||
| if (decoded_list) der_free_sequence_flexi(decoded_list); | ||
| if (tmpbuf != NULL) XFREE(tmpbuf); | ||
|
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| return err; | ||
| } | ||
|
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| #endif | ||
|
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| /* ref: $Format:%D$ */ | ||
| /* git commit: $Format:%H$ */ | ||
| /* commit time: $Format:%ai$ */ |
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