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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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39 lines
835 B
39 lines
835 B
#include <string.h> |
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#include "crypto_sign.h" |
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#include "crypto_hash_sha512.h" |
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#include "crypto_verify_32.h" |
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#include "ge.h" |
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#include "sc.h" |
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int crypto_sign_open( |
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const unsigned char* sig, |
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const unsigned char* m, unsigned long long mlen, |
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const unsigned char* pk |
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) |
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{ |
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unsigned char pkcopy[32]; |
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unsigned char rcopy[32]; |
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unsigned char scopy[32]; |
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unsigned char h[64]; |
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unsigned char rcheck[32]; |
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ge_p3 A; |
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ge_p2 R; |
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if (sig[63] & 224) goto badsig; |
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if (ge_frombytes_negate_vartime(&A,pk) != 0) goto badsig; |
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memmove(pkcopy,pk,32); |
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memmove(rcopy, sig, 32); |
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memmove(scopy, sig + 32,32); |
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crypto_hash_sha512_3(h, rcopy, 32, pkcopy, 32, m, mlen); |
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sc_reduce(h); |
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ge_double_scalarmult_vartime(&R,h,&A,scopy); |
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ge_tobytes(rcheck,&R); |
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if (crypto_verify_32(rcheck,rcopy) == 0) |
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return 0; |
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badsig: |
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return -1; |
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}
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