mirror of
https://github.com/clearml/dropbear
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48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
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#include "includes.h"
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#if DROPBEAR_SK_ECDSA
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#include "dbutil.h"
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#include "ecc.h"
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#include "ecdsa.h"
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#include "sk-ecdsa.h"
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int buf_sk_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf, const char* app, unsigned int applen) {
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hash_state hs;
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unsigned char subhash[SHA256_HASH_SIZE];
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buffer *sk_buffer = NULL, *sig_buffer = NULL;
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unsigned char flags;
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unsigned int counter;
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int ret;
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TRACE(("buf_sk_ecdsa_verify"))
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/* from https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.u2f */
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/* ecdsa signature to verify (r, s) */
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sig_buffer = buf_getbuf(buf);
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flags = buf_getbyte (buf);
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counter = buf_getint (buf);
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/* create the message to be signed */
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sk_buffer = buf_new (2*SHA256_HASH_SIZE+5);
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sha256_init (&hs);
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sha256_process (&hs, app, applen);
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sha256_done (&hs, subhash);
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buf_putbytes (sk_buffer, subhash, sizeof (subhash));
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buf_putbyte (sk_buffer, flags);
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buf_putint (sk_buffer, counter);
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sha256_init (&hs);
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sha256_process (&hs, data_buf->data, data_buf->len);
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sha256_done (&hs, subhash);
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buf_putbytes (sk_buffer, subhash, sizeof (subhash));
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ret = buf_ecdsa_verify(sig_buffer, key, sk_buffer);
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buf_free(sk_buffer);
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buf_free(sig_buffer);
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TRACE(("leave buf_sk_ecdsa_verify, ret=%d", ret))
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return ret;
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}
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#endif /* DROPBEAR_SK_ECDSA */
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